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  Subjects -> SCIENCES: COMPREHENSIVE WORKS (Total: 426 journals)
Showing 1 - 200 of 265 Journals sorted alphabetically
AAS Open Research     Open Access   (Followers: 1)
ABC Journal of Advanced Research     Open Access  
Accountability in Research: Policies and Quality Assurance     Hybrid Journal   (Followers: 22)
Acta Materialia Transilvanica     Open Access  
Acta Nova     Open Access   (Followers: 1)
Acta Scientifica Malaysia     Open Access  
Acta Scientifica Naturalis     Open Access   (Followers: 3)
Adıyaman University Journal of Science     Open Access  
Advanced Science     Open Access   (Followers: 13)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 11)
Advanced Theory and Simulations     Hybrid Journal   (Followers: 5)
Advances in Research     Open Access  
Advances in Science and Technology     Full-text available via subscription   (Followers: 17)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 8)
Afrique Science : Revue Internationale des Sciences et Technologie     Open Access   (Followers: 2)
AFRREV STECH : An International Journal of Science and Technology     Open Access   (Followers: 4)
American Academic & Scholarly Research Journal     Open Access   (Followers: 6)
American Journal of Applied Sciences     Open Access   (Followers: 27)
American Journal of Humanities and Social Sciences     Open Access   (Followers: 16)
ANALES de la Universidad Central del Ecuador     Open Access   (Followers: 4)
Anales del Instituto de la Patagonia     Open Access  
Applied Mathematics and Nonlinear Sciences     Open Access   (Followers: 1)
Apuntes de Ciencia & Sociedad     Open Access  
Arab Journal of Basic and Applied Sciences     Open Access  
Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 5)
Archives Internationales d'Histoire des Sciences     Partially Free   (Followers: 7)
Archives of Current Research International     Open Access  
ARO. The Scientific Journal of Koya University     Open Access  
ARPHA Conference Abstracts     Open Access   (Followers: 6)
ARPHA Proceedings     Open Access   (Followers: 5)
ArtefaCToS : Revista de estudios sobre la ciencia y la tecnología     Open Access   (Followers: 1)
Asia-Pacific Journal of Science and Technology     Open Access  
Asian Journal of Advanced Research and Reports     Open Access   (Followers: 2)
Asian Journal of Applied Science and Engineering     Open Access   (Followers: 2)
Asian Journal of Scientific Research     Open Access   (Followers: 3)
Asian Journal of Technology Innovation     Hybrid Journal   (Followers: 7)
Australian Field Ornithology     Full-text available via subscription   (Followers: 4)
Australian Journal of Social Issues     Hybrid Journal   (Followers: 7)
AZimuth     Full-text available via subscription   (Followers: 2)
Bangladesh Journal of Scientific Research     Open Access   (Followers: 1)
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (Followers: 3)
Berichte Zur Wissenschaftsgeschichte     Hybrid Journal   (Followers: 10)
Berkeley Scientific Journal     Full-text available via subscription  
BIBECHANA     Open Access   (Followers: 2)
BibNum     Open Access  
Bilge International Journal of Science and Technology Research     Open Access   (Followers: 1)
Bioethics Research Notes     Full-text available via subscription   (Followers: 16)
Bistua : Revista de la Facultad de Ciencias Básicas     Open Access  
BJHS Themes     Open Access   (Followers: 1)
Black Sea Journal of Engineering and Science     Open Access  
Borneo Journal of Resource Science and Technology     Open Access  
Brazilian Journal of Science and Technology     Open Access   (Followers: 2)
Bulletin de la Société Royale des Sciences de Liège     Open Access  
Bulletin of the National Research Centre     Open Access  
Butlletí de la Institució Catalana d'Història Natural     Open Access  
Central European Journal of Clinical Research     Open Access  
Chain Reaction     Full-text available via subscription  
Ciencia & Natura     Open Access   (Followers: 1)
Ciencia Amazónica (Iquitos)     Open Access   (Followers: 1)
Ciencia en Desarrollo     Open Access   (Followers: 3)
Ciencia en su PC     Open Access   (Followers: 1)
Ciencia Ergo Sum     Open Access  
Ciência ET Praxis     Open Access  
Ciencia y Tecnología     Open Access  
Ciencia, Docencia y Tecnología     Open Access  
Ciencias Holguin     Open Access   (Followers: 2)
CienciaUAT     Open Access   (Followers: 1)
Citizen Science : Theory and Practice     Open Access   (Followers: 2)
Communications Faculty of Sciences University of Ankara Series A2-A3 Physical Sciences and Engineering     Open Access  
Communications in Applied Sciences     Open Access  
Comprehensive Therapy     Hybrid Journal   (Followers: 3)
Comunicata Scientiae     Open Access   (Followers: 1)
ConCiencia     Open Access  
Conference Papers in Science     Open Access   (Followers: 2)
Configurations     Full-text available via subscription   (Followers: 10)
COSMOS     Hybrid Journal   (Followers: 1)
Crea Ciencia Revista Científica     Open Access   (Followers: 2)
Cuadernos de Investigación UNED     Open Access  
Current Issues in Criminal Justice     Hybrid Journal   (Followers: 15)
Current Research in Geoscience     Open Access   (Followers: 8)
Dalat University Journal of Science     Open Access  
Data     Open Access   (Followers: 5)
Data Curation Profiles Directory     Open Access   (Followers: 5)
Dhaka University Journal of Science     Open Access  
Dharmakarya     Open Access  
Diálogos Interdisciplinares     Open Access  
Digithum     Open Access   (Followers: 2)
Discover Sustainability     Open Access   (Followers: 3)
Einstein (São Paulo)     Open Access  
Ekaia : EHUko Zientzia eta Teknologia aldizkaria     Open Access  
Elkawnie : Journal of Islamic Science and Technology     Open Access  
Emergent Scientist     Open Access  
Enhancing Learning in the Social Sciences     Open Access   (Followers: 9)
Enseñanza de las Ciencias : Revista de Investigación y Experiencias Didácticas     Open Access  
Entramado     Open Access  
Entre Ciencia e Ingeniería     Open Access   (Followers: 1)
Epiphany     Open Access   (Followers: 4)
Ergo     Open Access  
Estação Científica (UNIFAP)     Open Access   (Followers: 1)
Ethiopian Journal of Education and Sciences     Open Access   (Followers: 6)
Ethiopian Journal of Science and Technology     Open Access  
Ethiopian Journal of Sciences and Sustainable Development     Open Access   (Followers: 5)
European Online Journal of Natural and Social Sciences     Open Access   (Followers: 12)
European Scientific Journal     Open Access   (Followers: 10)
Evidência - Ciência e Biotecnologia - Interdisciplinar     Open Access  
Exchanges : the Warwick Research Journal     Open Access   (Followers: 2)
Experimental Results     Open Access   (Followers: 1)
Extensionismo, Innovación y Transferencia Tecnológica     Open Access   (Followers: 3)
Facets     Open Access  
Fides et Ratio : Revista de Difusión Cultural y Científica     Open Access   (Followers: 1)
Fırat University Turkish Journal of Science & Technology     Open Access  
Fontanus     Open Access  
Forensic Science Policy & Management: An International Journal     Hybrid Journal   (Followers: 377)
Frontiers for Young Minds     Open Access  
Frontiers in Climate     Open Access   (Followers: 3)
Frontiers in Science     Open Access   (Followers: 1)
Fundamental Research     Open Access  
Futures & Foresight Science     Hybrid Journal   (Followers: 4)
Gaudium Sciendi     Open Access   (Followers: 1)
Gazi University Journal of Science     Open Access  
Ghana Studies     Full-text available via subscription   (Followers: 15)
Global Journal of Pure and Applied Sciences     Full-text available via subscription  
Global Journal of Science Frontier Research     Open Access   (Followers: 2)
Globe, The     Full-text available via subscription   (Followers: 4)
HardwareX     Open Access  
Heidelberger Jahrbücher Online     Open Access  
Heliyon     Open Access  
Himalayan Journal of Science and Technology     Open Access   (Followers: 1)
History of Science and Technology     Open Access   (Followers: 1)
Hoosier Science Teacher     Open Access  
Iberoamerican Journal of Science Measurement and Communication     Open Access  
Impact     Open Access   (Followers: 2)
Indian Journal of History of Science     Hybrid Journal   (Followers: 2)
Indonesian Journal of Fundamental Sciences     Open Access  
Indonesian Journal of Science and Mathematics Education     Open Access   (Followers: 4)
Indonesian Journal of Science and Technology     Open Access  
Ingenieria y Ciencia     Open Access   (Followers: 1)
Innovare : Revista de ciencia y tecnología     Open Access  
Instruments     Open Access  
Integrated Research Advances     Open Access  
Interciencia     Open Access   (Followers: 1)
Interface Focus     Full-text available via subscription  
International Annals of Science     Open Access  
International Archives of Science and Technology     Open Access  
International Journal of Academic Research in Business, Arts & Science     Open Access   (Followers: 2)
International Journal of Advanced Multidisciplinary Research and Review     Open Access  
International Journal of Applied Science     Open Access  
International Journal of Basic and Applied Sciences     Open Access   (Followers: 4)
International Journal of Computational and Experimental Science and Engineering (IJCESEN)     Open Access  
International Journal of Culture and Modernity     Open Access   (Followers: 2)
International Journal of Engineering, Science and Technology     Open Access  
International Journal of Innovation and Applied Studies     Open Access   (Followers: 12)
International Journal of Innovative Research and Scientific Studies     Open Access   (Followers: 6)
International Journal of Network Science     Hybrid Journal   (Followers: 3)
International Journal of Recent Contributions from Engineering, Science & IT     Open Access   (Followers: 1)
International Journal of Research in Science     Open Access   (Followers: 2)
International Journal of Science & Emerging Technologies     Open Access   (Followers: 1)
International Journal of Social Sciences and Management     Open Access   (Followers: 3)
International Journal of Technology Policy and Law     Hybrid Journal   (Followers: 7)
International Letters of Social and Humanistic Sciences     Open Access   (Followers: 1)
International Review of Applied Sciences     Open Access  
InterSciencePlace     Open Access   (Followers: 1)
Investiga : TEC     Open Access  
Investigación Joven     Open Access  
Investigación Valdizana     Open Access  
Investigacion y Ciencia     Open Access   (Followers: 1)
Iranian Journal of Science and Technology, Transactions A : Science     Hybrid Journal  
iScience     Open Access   (Followers: 2)
Issues in Science & Technology     Free   (Followers: 7)
Ithaca : Viaggio nella Scienza     Open Access  
J : Multidisciplinary Scientific Journal     Open Access  
Jaunujų mokslininkų darbai     Open Access   (Followers: 1)
Journal de la Recherche Scientifique de l'Universite de Lome     Full-text available via subscription   (Followers: 2)
Journal of Chromatography & Separation Techniques     Open Access   (Followers: 12)
Journal of Advanced Research     Open Access   (Followers: 3)
Journal of Al-Qadisiyah for Pure Science     Open Access   (Followers: 1)
Journal of Alasmarya University     Open Access   (Followers: 2)
Journal of Analytical Science & Technology     Open Access   (Followers: 6)
Journal of Applied Science and Technology     Full-text available via subscription   (Followers: 1)
Journal of Applied Sciences and Environmental Management     Open Access   (Followers: 3)
Journal of Big History     Open Access   (Followers: 3)
Journal of Composites Science     Open Access   (Followers: 3)
Journal of Critical Thought and Praxis     Open Access   (Followers: 2)
Journal of Deliberative Mechanisms in Science     Open Access  
Journal of Diversity Management     Open Access   (Followers: 6)
Journal of Indian Council of Philosophical Research     Hybrid Journal  
Journal of Institute of Science and Technology     Open Access  
Journal of Integrated Science and Technology     Open Access  
Journal of Interaction Science     Open Access   (Followers: 1)
Journal of Kerbala University     Open Access   (Followers: 1)
Journal of King Saud University - Science     Open Access   (Followers: 1)
Journal of Law, Information and Science     Full-text available via subscription   (Followers: 20)
Journal of Mathematical and Fundamental Sciences     Open Access  
Journal of Natural Sciences and Mathematics Research     Open Access  
Journal of Natural Sciences Research     Open Access   (Followers: 4)
Journal of Negative and No Positive Results     Open Access  
Journal of Responsible Technology     Open Access   (Followers: 1)
Journal of Science (JSc)     Open Access  
Journal of Science and Engineering     Open Access  
Journal of Science and Technology     Open Access   (Followers: 2)

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Ciencia & Natura
Number of Followers: 1  

  This is an Open Access Journal Open Access journal
ISSN (Print) 2179-460X
Published by Universidade Federal de Santa Maria Homepage  [16 journals]
  • Trabalhos Destacados no II Encontro de Meteorologia do Estado de Santa
           Catarina (II ENMET-SC) - Florianópolis, SC, out/2019

    • Authors: Mário Francisco Leal de Quadro, Dirceu Luis Herdies; Dirceu Luis Herdies
      First page: 1
      Abstract: Editorial.
      PubDate: 2020-09-25
      DOI: 10.5902/2179460X55344
      Issue No: Vol. 42 (2020)
       
  • Influence of hydrometeorological variations on the water quality of the
           low river Itajaí-Mirim, municipality of Itajaí (SC)

    • Authors: Evandro Oscar Mafra, Eduardo Werneck, Viviane Tranker, Aline Pereira Gomes; Eduardo Werneck, Viviane Tranker, Aline Pereira Gomes
      First page: 2
      Abstract: The Itajaí-Mirim River located in Santa Catarina, in the region of the low estuary of the Itajaí-Açu River, is the place where most of the water supplied for consumption is consumed by the Municipalities of Itajaí and Navegantes, the São Roque catchment station. This study aims to analyze the water quality in the Itajaí-Mirim river before and after the implantation of the dam in the Itajaí-Mirim river, based on a monitoring of physical-chemical parameters. The collections described in this report were carried out at six sample points, from January to December 2007, with the purpose of physically and chemically characterizing the environment in the rectified channel and, also, in the original bed of Itajaí-Mirim. The parameters measured in situ serve to assess the general state of water quality at the time of sampling. The main parameters measured, four of them deserve special attention (pH, Turbidity, Dissolved Oxygen and Salinity) and the correlated environmental parameters were flow rate and precipitation. In general, depending on the main results obtained, the analyzed waters can be classified in Class 2 of fresh waters, according to the limit values of CONAMA Resolution No. 357/05, and for the sampled period, precipitation and flow influenced the water quality.
      PubDate: 2020-09-25
      DOI: 10.5902/2179460X55301
      Issue No: Vol. 42 (2020)
       
  • Influence of heat waves on the agronomic performance of beans in the
           municipality of Campos Novos, Santa Catarina

    • Authors: Rosandro Boligon Minuzzi, Eduardo Pickius; Eduardo Pickius
      First page: 3
      Abstract: The aim of this study was to evaluate the influence of heat waves on the agronomic performance of beans in the municipality of Campos Novos, in Santa Catarina State, Brazil located in Southern Brazil. Daily data of maximum, minimum temperatures and rainfall from 1997 to 2011 from the Meteorological Station of Campos Novos were used. The data were analyzed in the Aquacrop 6.0 software to determine the cycle duration, biomass, yield and water use efficiency through evapotranspiration. In the three harvest years evaluated, it can be observed that heat waves tend to decrease cycle duration from one to three days and bean yield to 333kg/ha. The effects of heat waves on biomass production and on the efficiency of bean water use were uncertain because they may be linked to other constraints.
      PubDate: 2020-09-25
      DOI: 10.5902/2179460X55303
      Issue No: Vol. 42 (2020)
       
  • Relationship between electricity demand and temperature: methodology for
           load forecasting using weather numerical simulation

    • Authors: Kauan Vargas Casarin, Vagner Anabor, Franciano Scremin Puhales, Everson Dal Piva; Vagner Anabor, Franciano Scremin Puhales, Everson Dal Piva
      First page: 4
      Abstract: This work aims to study the relationship between the demand for electricity and the temperature for the concession area of a given electricity distributor, in order to develop a representative load forecast method for this area. For this purpose, a weather numerical simulation is made using the regional meteorological model Weather Research and Forecasting (WRF) for the study area and, from that, the average temperature in the distributor's concession area is calculated, considering the number of consumers in each city that makes up that same area, called Average Temperature Weighted by the Number of Consumers (TMPNC). With this, a temperature index is obtained that effectively describes the influence of temperature on the load, since a greater weight is given to temperatures in cities where there are more consumers. Thus, it is observed that the relationship between the load and the TMPNC differs depending on the month, day of the week and time of day, due to different causes related to human activity, socioeconomic factors, weather conditions, etc. However, a load forecast method is developed based on a regression algorithm that uses the load and TMPNC data as input, returning regression functions that describe the load behavior as a function of the TMPNC. The forecasting method developed resulted in load estimates with an mean absolute percentage error of 1.8%.
      PubDate: 2020-09-25
      DOI: 10.5902/2179460X55304
      Issue No: Vol. 42 (2020)
       
  • Numerical and observational study of an event of decrease in the total
           ozone column of tropical origin in Southern Brazil

    • Authors: Lissette Guzmán, Vagner Anabor, Luiz Angelo Steffenel, Damaris Kirsch Pinheiro; Vagner Anabor, Luiz Angelo Steffenel, Damaris Kirsch Pinheiro
      First page: 5
      Abstract: A depletion event of 11% of the total ozone column over South Brazil was analyzed from observational data and numerical simulations. The meteorological fields resulting from the simulation did not show the presence of subtropical or polar jets over the study region. The real and simulated soundings showed the dryness at high and low tropospheric levels, pointing a stratospheric intrusion. The total ozone column values from ERA-5 reanalyses showed the maintenance of a region with low total ozone values in tropical latitudes and its advance over the study region, before and during the depletion event. The isentropic retro-trajectories of air parcels at different levels, obtained with the Hybrid Single Lagrangian Integrated Trajectory Model (HYSPLIT), confirmed the zonal transport from the tropical region over Southern Brazil. A combination of a cyclonic circulation at the 850 K stratospheric isentropic level and an intense anticyclonic circulation at the 440 K tropospheric level, over the depletion region, was identified as responsible for the tropopause lift and horizontal transport of ozone-rich air out of the column.
      PubDate: 2020-09-25
      DOI: 10.5902/2179460X55305
      Issue No: Vol. 42 (2020)
       
  • Development of low cost weather stations network for regional forecast in
           nowcasting

    • Authors: Elisvania Machado de Sousa, Leonardo Alexandrino de Melo, Franciano Scremin Puhales, Vagner Anabor; Leonardo Alexandrino de Melo, Franciano Scremin Puhales, Vagner Anabor
      First page: 6
      Abstract: The use of Internet of Things (IoT) has intensified in the current decade, and this paper demonstrates how it can help solve problems regarding forecast, analyses and study of meteorological variables in several points of small areas. When applying the concept of IoT in meteorological instrumentation, looking forward to build a high cost-effective prototype of an embedded system, costing hundredths of a professional station,  capable of gather and share meteorological data with precision and high frequency, which are essential in applications such as nowcasting.
      PubDate: 2020-09-25
      DOI: 10.5902/2179460X55306
      Issue No: Vol. 42 (2020)
       
  • Data assimilation impact using Valeri's campaign observations in
           Santa Catarina state

    • Authors: Rute Costa Ferreira, Luciano Ritter Nolasco Junior, Dirceu Luis Herdies, Éder Paulo Vendrasco, Fábio Luiz Rodrigues Diniz, Saulo Barros Costa, Mário Francisco Leal de Quadro, Diego Oliveira de Souza, Marília Guedes do Nascimento, César Augustus Assis Beneti, Gabriel Bonow Munchow, Ricardo Antonio Mollmann Junior, Gabriel Luan Rodrigues, Arthur Muller, Rita de Cassia Alves; Luciano Ritter Nolasco Junior, Dirceu Luis Herdies, Éder Paulo Vendrasco, Fábio Luiz Rodrigues Diniz, Saulo Barros Costa, Mário Francisco Leal de Quadro, Diego Oliveira de Souza, Marília Guedes do Nascimento, César Augustus Assis Beneti, Gabriel Bonow Munchow, Ricardo Antonio Mollmann Junior, Gabriel Luan Rodrigues, Arthur Muller, Rita de Cassia Alves
      First page: 7
      Abstract: The state of Santa Catarina is often hit by extreme events such as heavy rain, windstorms, hail and eventually tornadoes. Thus, the goal of the present study was to verify how the inclusion of a larger number of observations could improve the prediction of such events. Thus, through a campaign carried out in the west of Santa Catarina, surface and radiosonde data were collected and assimilated through the GSI system. This process produced an updated initial condition to the weather prediction model WRF. The surface data assimilation had 84 new pressure observations. The radiosonde experiment had 162 observations of temperature, wind, and humidity assimilated. It was observed that the improvement of the initial condition through the insertion of the local surface and upper air data obtained during the campaign significantly improved the forecast in the conduced experiments.
      PubDate: 2020-09-25
      DOI: 10.5902/2179460X55307
      Issue No: Vol. 42 (2020)
       
  • Use of remote sensing via satellite in the identification of tornado
           damage paths in a severe weather event in Rio Grande do Sul

    • Authors: Murilo Machado Lopes, Ernani de Lima Nascimento; Ernani de Lima Nascimento
      First page: 8
      Abstract: The number of tornado reports in Brazil has increased in recent years; nevertheless, it is likely that many occurrences over uninhabited areas and/or during night time hours remain unconfirmed, especially in a country devoid of official surveys of damage caused by intense winds. This work follows previous initiatives addressing the employment of remote sensing via satellite to identify damage paths associated with tornadoes. The nocturnal event analyzed in this study took place in north-northeast Rio Grande do Sul state from the night hours of 7 June 2017 into early morning hours of the following day, and represents an example of the characterization of significant damage caused by tornadoes despite the lack of visual confirmation of the phenomenon. Images produced by low-orbit environmental satellites of the Landsat and Sentinel series are analyzed, as well as imagery made available by the commercial-purpose environmental satellites that comprise the data base of Google Earth software. To aid in the identification of damage inflicted to dense vegetation, the web tools Global Florest Change and Global Florest Watch, which employ objective methods to detect abrupt modifications in the vegetation cover, are also utilized. Based on these products, it was possible to identify seven tornado damage tracks for the nocturnal event of June 2017, ratifying the value added by remote sensing products in the confirmation of tornadic episodes.
      PubDate: 2020-09-25
      DOI: 10.5902/2179460X55309
      Issue No: Vol. 42 (2020)
       
  • Analysis of Precipitation Temporal Variability in the
           Florianópolis/SC City

    • Authors: Deise Rodrigues Barcellos, Mônica Aparecida Dias Wolf, Sérgio Roberto Sanches, Mário Francisco Leal de Quadro; Mônica Aparecida Dias Wolf, Sérgio Roberto Sanches, Mário Francisco Leal de Quadro
      First page: 9
      Abstract: The excess or deficiency of precipitation directly affects environmental conditions, influencing society and its various economic sectors. This study analyzes the variability of precipitation in Florianópolis / SC, using the Rain Anomaly Index (RAI). To identify possible changes in the precipitation pattern, non-parametric tests are performed with a 5% significance and linear regression with a 95% confidence level in the data from the Climate Prediction Center (CPC) during the period 1979 to 2017. The results show that the most of the positive (negative) precipitation indexes correspond to the years of the warm (cold) phase of the Pacific Decadal Oscillation (PDO), and with the highest frequency of El Niño (La Niña) events. Annual time series indicate a decline in precipitation. It is also observed: (i) a small tendency to reduce rainfall in summer, autumn and winter; (ii) a significant tendency to reduce rainfall in the spring (61.4 mm in the period) and (iii) a reduction of 7.9 mm / year and a total of 308.6 mm in the period. It can be infer that rainfall totals in the months of greatest convective warming are decreasing in recent years due to the reduction in the number of rainy days or extreme rainfall.
      PubDate: 2020-09-25
      DOI: 10.5902/2179460X55310
      Issue No: Vol. 42 (2020)
       
  • Statistical classification of homogenous surface temperature regions in
           Santa Catarina, Brazil

    • Authors: Carlos Eduardo Salles de Araujo
      First page: 10
      Abstract: Time series of hourly temperature from 146 weather stations located in Santa Catarina State – South Brazil were used to show that a compact data representation, using probability density functions (PDF) parameters, could be useful to classify homogeneous air temperature areas. The normal distribution fitted well the 146 weather stations temperature time series, presenting a median value of 0.9721 for the Pearson correlation coefficient.  The means and standard deviations obtained by adjusting the Gaussian functions for the 146 stations were used as input parameters for two different classifiers: hierarchical and k-means. Both classifiers separated Santa Catarina's weather stations into four distinct groups. These groups had direct relationship with altitude ranges and with the influence of sea. The classification of weather stations in different homogeneous groups was useful to identify climatic behaviors of hourly temperatures. In addition to the characterization of the climate itself, this classification can be useful as a support for the validation of numerical weather forecast models, and for the identification of abnormal temperature time series in a regional spatial context.
      PubDate: 2020-09-25
      DOI: 10.5902/2179460X55311
      Issue No: Vol. 42 (2020)
       
  • Influence of the PDO and AMO patterns on the air temperature in Brazil
           during the austral winter

    • Authors: Douglas da Silva Lindemann, Rose Ane Pereira de Freitas; Rose Ane Pereira de Freitas
      First page: 11
      Abstract: Anomalies of sea surface temperature (SST) favor the emergence of climatic variability modes, which can be transferred by atmospheric teleconnections to different regions of the globe. The present study sought to identify influences of the Pacific Decadal Oscillation (PDO) and the Atlantic Multidecadal Oscillation (AMO) on the air temperature in Brazil, during the period from 1901 to 2012. It was found that the negative periods of the PDO and AMO (1901-2012) have a greater influence on the South and North regions of Brazil. When these modes of variability are in opposite phases (1901-1927), they mainly interfere in the southern region of Brazil. On the other hand, when the PDO is in the negative phase and the AMO is moving from the positive to the negative phase (1944-1975), the northern region of Brazil is more influenced.
      PubDate: 2020-09-25
      DOI: 10.5902/2179460X55312
      Issue No: Vol. 42 (2020)
       
  • Climatological Analysis of Extratropical Cyclones’ trajectories formed
           in the Antarctic Peninsula region

    • Authors: Mariana Monteiro dos Santos Gandra, Mário Francisco Leal de Quadro; Mário Francisco Leal de Quadro
      First page: 12
      Abstract: Cyclones play an important role in the general circulation of the atmosphere, enabling the meridional transport of excess heat, humidity and momentum from low latitudes to high latitudes. In the Southern Hemisphere, the area between southern Brazil and the Peninsula Antarctica (AP) is described as one of the most favorable for the formation of cyclones (30°S to 70°S) due to the existence of strong temperature gradient between the ocean and the surface air layer above the ocean and also because of pre-existing baroclinic instabilities. This study is associated with the Project ATMOS  (AnTarctic Modeling Observation System) and explored the role of extratropical cyclones in teleconnections between high and medium latitudes to track the trajectories of extratropical cyclones that are formed in the Antarctic Peninsula (AP) and move towards the central sector of the South Atlantic. The analysis of the tracked trajectories showed that the cyclones reached the central sector of the South Atlantic during the months of autumn (greater number) and winter (greater displacement), while the statistical analysis indicated that the intensity of the cyclones is more linearly linked to the mean sea level pressure field than to Superficial Sea Temperature Anomalies.
      PubDate: 2020-09-25
      DOI: 10.5902/2179460X55313
      Issue No: Vol. 42 (2020)
       
  • The influence of the zonal variation of the Brazil-Malvinas confluence in
           the harvest of the mullet in the state of Santa Catarina between 2006 and
           2016

    • Authors: Evandro Oscar Mafra, Rafael de Oliveira, Mário Francisco Leal de Quadro; Rafael de Oliveira, Mário Francisco Leal de Quadro
      First page: 13
      Abstract: The Brazil-Malvinas Confluence (CBM) comprises the region located in the southwestern portion of the Atlantic Ocean, with a strong influence on meteorological aspects and oceanographic phenomena, including sea surface temperature (SST). Variations in SST, influence the dynamics and behavior of aquatic species and consequently the fishing productivity of mullet (Mugil liza), a species of great economic importance in the state of Santa Catarina. The present study deals with the analysis of the influence of the CBM zonal variation on the sea surface temperature (SST) in southern Brazil, making a comparison with the data of the fish harvest in the Santa Catarina coast, considering a period of 11 years (2006 to 2016) and in the months of fishing (April to July). From the data analysis it is possible to identify the characteristic behavior of the period and to analyze the influencing factors.
      PubDate: 2020-09-25
      DOI: 10.5902/2179460X55314
      Issue No: Vol. 42 (2020)
       
  • Study of the components of the hydrological balance during episode of SACZ

    • Authors: Ana Paula da Silva Faggiani, Mário Francisco Leal de Quadro, Luis Gustavo de Gonçalves de Gonçalves, Dirceu Luis Herdies; Mário Francisco Leal de Quadro, Luis Gustavo de Gonçalves de Gonçalves, Dirceu Luis Herdies
      First page: 14
      Abstract: The South Atlantic Convergence Zone (SACZ) is one of the meteorological systems that plays a strong role in the rainfall regime in many regions of Brazil. This work aims to analyze the daytime cycle of the components of the hydrological balance during events of SACZ. Through the hourly data from the atmospheric reanalysis of Modern-Era Retrospective Analysis for Research and Applications, Version 2 (MERRA2) the variables evapotranspiration, precipitation, convergence of moisture flow and variation of moisture storage in the atmosphere with time during the periods were analyzed. from dawn, morning, afternoon and night throughout the region of the SACZ and therefore, specifically in the region of the Amazon and Southeast Brazil. The analysis of the regions separately shows that even during the night there is convective activity and divergence of water vapor in the Amazon, which allows the flow of steam to be transported to the southeast even during night periods. Over the Southeast region it is possible to verify that during the night the convergence of atmospheric humidity can explain almost entirely the precipitation during the night. During the hours of the day, much of the precipitation can be explained by the increase in evapotranspiration over the Southeast.
      PubDate: 2020-09-25
      DOI: 10.5902/2179460X55315
      Issue No: Vol. 42 (2020)
       
  • Physical processes analysis of contrails formation over the South Brazil
           Region

    • Authors: Vanessa Lins, Renato Ramos da Silva; Renato Ramos da Silva
      First page: 15
      Abstract: Contrails are clouds in the shape of condensation trails formed from hot air and particles exiting the engines of airplanes. These clouds form from the isobaric mixing of hot and humid air masses emitted by airplanes with cold ambient air. Their formation can alter the sky through cirrus clouds and the radiation balance. In this study, photographic images, satellite data and atmospheric reanalysis and radiosonde data were used to assess the occurrence of these events in the South Brazil region. The results showed that there were observed several cases of contrails in the region, mainly when the upper layer where the aircraft passed was colder and moister. Initially, several cases were selected from the observations and the Terra, Aqua and Suomi satellite images. Also, radiosonding data from Curitiba, Florianópolis and Porto Alegre were applied to the thermodynamic Appleman diagram to study the physical processes involved. The results showed that temperatures below -50 °C from cold advection and moister air at the cruising level of airplanes contribute to formation of more persistent contrails and cirrus clouds. Therefore, monitoring the environmental conditions may improve the prediction of contrails formation and better understanding the impacts on the radiation balance and climate.
      PubDate: 2020-09-25
      DOI: 10.5902/2179460X55316
      Issue No: Vol. 42 (2020)
       
  • Identification of episodes of atmospheric heat waves and cold spells in
           the central region of the Santa Catarina coast

    • Authors: Monalisa Steil, Carlos Medeiros Ineu Júnior, Cristiane Rosa, Gabriela Lamim, Gabriel Serrato de Mendonça Silva, Mário Francisco Leal de Quadro; Carlos Medeiros Ineu Júnior, Cristiane Rosa, Gabriela Lamim, Gabriel Serrato de Mendonça Silva, Mário Francisco Leal de Quadro
      First page: 16
      Abstract: Extreme events such as heat waves (HWs) or cold spells (CSs) can cause damage to human health, to productive activities such as agriculture and livestock, as well as causing various environmental impacts. Therefore, the aim of this study is to identify the variability of the occurrence, duration and intensity mean of atmospheric HWS and CSs in the central part of the Santa Catarina coast from 1982 to 2017. For the detection of HWs and CSs in the atmosphere, the anomalies of the atmospheric temperature data were calculated in relation to the climatological normal, by calculating the 90th and 10th percentiles for HWs and CSs, respectively. The minimum persistence of five days of anomalous temperature values in relation to the daily climatological average was considered. In this work, reanalysis data from the Era-Interim project were used, and the calculations were computed by the ‘‘RmarineHeatWaves’’ package. Based on the calculations and analyzes done, the occurrence of this extreme events in the respective region was checked, with different periods of duration. A greater number of cases of HWs have been observed since the 2000s, corroborating with previous studies. The longest-lasting HW (CS) was seen in April 2016 (July 2000).
      PubDate: 2020-09-25
      DOI: 10.5902/2179460X55317
      Issue No: Vol. 42 (2020)
       
 
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