Advances in Science and Research (ASR)
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Open Access journal
ISSN (Print) 1992-0636 - ISSN (Online) 1992-0628
Published by Copernicus Publications [43 journals]
- Do modelled or satellite-based estimates of surface solar irradiance
accurately describe its temporal variability?
Abstract: Do modelled or satellite-based estimates of surface solar irradiance accurately describe its temporal variability?
Marc Bengulescu, Philippe Blanc, Alexandre Boilley, and Lucien Wald
Adv. Sci. Res., 14, 35-48, doi:10.5194/asr-14-35-2017, 2017
This study investigates the characteristic time-scales of variability found in long-term time-series of daily means of surface solar irradiance (SSI). Estimates of SSI from satellite-derived HelioClim-3 and radiation products from ERA-Interim and MERRA-2 re-analyses are compared to WRDC measurements. It is found that HelioClim-3 renders a more accurate picture of the variability found in ground measurements, not only globally, but also with respect to individual characteristic time-scales.
- NAO and extreme ocean states in the Northeast Atlantic Ocean
Abstract: NAO and extreme ocean states in the Northeast Atlantic Ocean
Emily Gleeson, Sarah Gallagher, Colm Clancy, and Frédéric Dias
Adv. Sci. Res., 14, 23-33, doi:10.5194/asr-14-23-2017, 2017
Large scale atmospheric oscillations, such as the North Atlantic Oscillation are known to have an influence on waves in the North Atlantic. This study investigated the influence of the NAO on the present and future wind and wave climate in the Northeast Atlantic near Ireland.
- Evaluation of various procedures transposing global tilted irradiance to
horizontal surface irradiance
Abstract: Evaluation of various procedures transposing global tilted irradiance to horizontal surface irradiance
Caroline Housmans and Cédric Bertrand
Adv. Sci. Res., 14, 17-22, doi:10.5194/asr-14-17-2017, 2017
Many transposition models have been proposed in the literature to convertsolar irradiance on the horizontal plane to that on a tilted plane. Theinverse process, i.e. the conversion from tilted to horizontal isinvestigated here based upon seven months of in-plane global solar irradiancemeasurements recorded on the roof of the Royal Meteorological Institute ofBelgium's radiation tower in Uccle (Longitude 4.35° E, Latitude50.79° N). Up to three pyranometers mounted on inclined planes ofdifferent tilts and orientations were involved in the inverse transpositionprocess. Our results indicate that (1) the tilt to horizontal irradianceconversion is improved when measurements from more than one tiltedpyranometer are considered (i.e. by using a multi-pyranometer approach) and(2) the improvement from using an isotropic model to anisotropic models inthe inverse transposition problem is not significant.
- Evaluating meso-scale change in performance of several databases of hourly
surface irradiation in South-eastern Arabic Pensinsula
Abstract: Evaluating meso-scale change in performance of several databases of hourly surface irradiation in South-eastern Arabic Pensinsula
Mathilde Marchand, Nasser Al-Azri, Armel Ombe-Ndeffotsing, Etienne Wey, and Lucien Wald
Adv. Sci. Res., 14, 7-15, doi:10.5194/asr-14-7-2017, 2017
The solar hourly irradiation received at ground level estimated by the databases HelioClim-3v4, HelioClim-3v5 and Copernicus Atmosphere Monitoring Service (CAMS) Radiation Service are compared to measurements made in stations in Oman and Abu Dhabi. The correlation coefficients are greater than 0.97. The relative bias is less than 5%. Each database captures accurately the temporal and spatial variability of the irradiance field. The three databases are reliable sources to assess solar radiation.
- Present and future responses of growing degree days for Crete Island in
Abstract: Present and future responses of growing degree days for Crete Island in Greece
Spyridon Paparrizos and Andreas Matzarakis
Adv. Sci. Res., 14, 1-5, doi:10.5194/asr-14-1-2017, 2017
Determination of heat requirements in the first developing phases of plants has been expressed as Growing Degree Days (GDD) and is useful in order to understand the flowering season development in plant species, and forecast when flowering will occur. The study dealt with the estimation of GDD in Crete Island in Greece. Results indicated that in the future, GDD will be increased and the existing cultivations can reach maturity sooner. Neverthelless, rough topography will act as an inhibitor.
- Climate reference stations in Germany:
Status, parallel measurements and
homogeneity of temperature time series
Abstract: Climate reference stations in Germany: Status, parallel measurements and homogeneity of temperature time series
Frank Kaspar, Lisa Hannak, and Klaus-Jürgen Schreiber
Adv. Sci. Res., 13, 163-171, doi:10.5194/asr-13-163-2016, 2016
Germany's national meteorological service (DWD) operates a network of so-called climate reference stations. At these stations parallel measurements are performed in order to allow the comparison of manual and automatic observations. We present an analysis of parallel measurements of temperature at 2 m height. It is shown that the automation of stations did not cause an artificial increase in the series of daily mean temperature. A bias occurs for maximum temperature in specific configurations.
- Wind speed variability between 10 and 116 m height from the regional
reanalysis COSMO-REA6 compared to wind mast measurements over Northern
Germany and the Netherlands
Abstract: Wind speed variability between 10 and 116 m height from the regional reanalysis COSMO-REA6 compared to wind mast measurements over Northern Germany and the Netherlands
Michael Borsche, Andrea K. Kaiser-Weiss, and Frank Kaspar
Adv. Sci. Res., 13, 151-161, doi:10.5194/asr-13-151-2016, 2016
Wind speeds derived from the regional reanalysis COSMO-REA6 and from two global reanalyses of ECMWF (ERA-Interim and ERA-20C) have been compared to tower measurements covering heights from 10 m up to 140 m, located in the North Sea, in The Netherlands, and in Northeast Germany. In general, the monthly and hourly mean values of COSMO-REA6 are at least as close to the measurements as the global reanalyses, and in the correlation of daily means an added value of COSMO-REA6 is found.
- An overview of the use of Facebook in National Weather Services
Abstract: An overview of the use of Facebook in National Weather Services
Virginia Palacio, Olatz Principe, Maialen Martija, and Santiago Gaztelumendi
Adv. Sci. Res., 13, 145-150, doi:10.5194/asr-13-145-2016, 2016
Facebook is one of the most used social networks and it represents a perfect virtual platform to share information and to promote active and immediate interaction amongst users. This is why many NMSs develop new communication strategies and incorporate this tool for different purposes. In this paper we investigate how Facebook was introduced in different NMSs worldwide as an additional tool for the diffusion of meteorological information and interction with users.
- Study of NWP parameterizations on extreme precipitation events over Basque
Abstract: Study of NWP parameterizations on extreme precipitation events over Basque Country
Iván R. Gelpi, Santiago Gaztelumendi, Sheila Carreño, Roberto Hernández, and Joseba Egaña
Adv. Sci. Res., 13, 137-144, doi:10.5194/asr-13-137-2016, 2016
The Weather Research and Forecasting model (WRF), like other numericalmodels, can make use of several parameterization schemes. The purpose of thisstudy is to determine how available cumulus parameterization (CP) andmicrophysics (MP) schemes in the WRF model simulate extreme precipitationevents in the Basque Country. Possible combinations among two CP schemes(Kain–Fritsch and Betts–Miller–Janjic) and five MP (WSM3, Lin, WSM6, newThompson and WDM6) schemes were tested. A set of simulations, correspondingto 21st century extreme precipitation events that have caused significantflood episodes have been compared with point observational data coming fromthe Basque Country Automatic Weather Station Mesonetwork.
Configurations with Kain–Fritsch CP scheme produce better quantity ofprecipitation forecast (QPF) than BMJ scheme configurations. Depending onthe severity level and the river basin analysed different MP schemes showthe best behaviours, demonstrating that there is not a unique configurationthat solve exactly all the studied events.
- Validation of the new HelioClim-3 version 4 real-time and short-term
forecast service using 14 BSRN stations
Abstract: Validation of the new HelioClim-3 version 4 real-time and short-term forecast service using 14 BSRN stations
Claire Thomas, Laurent Saboret, Etienne Wey, Philippe Blanc, and Lucien Wald
Adv. Sci. Res., 13, 129-136, doi:10.5194/asr-13-129-2016, 2016
HelioClim-3 (version 4) is a satellite-derived solar surface irradiance database available at d-1 until 2015. To fulfill the requirements of numerous users, a new service based on the principle of persistence has been developed; it provides solar data in real time and forecasts until the end of the current day. The service exhibits good performances for 15 min and 1 h ahead forecasts, and degrades as the temporal horizon increases. Several customers have so far purchased this service.
- On the temporal variability of the surface solar radiation by means of
Abstract: On the temporal variability of the surface solar radiation by means of spectral representations
Marc Bengulescu, Philippe Blanc, and Lucien Wald
Adv. Sci. Res., 13, 121-127, doi:10.5194/asr-13-121-2016, 2016
The continuous wavelet (CWT) and the Hilbert–Huang transforms (HHT) are compared for the analysis of the temporal variability on ten years of daily means of the surface solar irradiance. In both cases, the variability exhibits a plateau between scales of two days and three months that has decreasing power with increasing scale, a spectral peak corresponding to the annual cycle, and a low power regime in-between. The HHT is shown to be suitable for inspecting the variability of the measurements.
- Wind gust warning verification
Abstract: Wind gust warning verification
Adv. Sci. Res., 13, 113-120, doi:10.5194/asr-13-113-2016, 2016
Warnings have become a standard product in meteorological centres since they help the public prevent major disasters and minimize costs or losses. They happen rarely and add a new temporal dimension, namely the time window of the forecasted event. Thus, specific verification methods are required to verify warnings. This paper analyses the warning verification issues and includes a real life example, the verification of wind gust warnings at the German Meteorological Centre (Deutscher Wetterdienst).
- Influence of sea surface roughness length parameterization on Mistral and
Abstract: Influence of sea surface roughness length parameterization on Mistral and Tramontane simulations
Anika Obermann, Benedikt Edelmann, and Bodo Ahrens
Adv. Sci. Res., 13, 107-112, doi:10.5194/asr-13-107-2016, 2016
Simulated surface winds in atmospheric models depend, among others, on the parameterization of the sea surface roughness. Three parameterizations (variation of Charnock parameter) were tested in the western Mediterranean area during Mistral events with the regional climate model COSMO-CLM. While the whole sea level pressure pattern did not change much, a larger Charnock parameter led to lower wind speeds and a rotation of the wind direction.
- Improving the climate data management in the meteorological service of
Angola: experience from SASSCAL
Abstract: Improving the climate data management in the meteorological service of Angola: experience from SASSCAL
Rafael Posada, Domingos Nascimento, Francisco Osvaldo S. Neto, Jens Riede, and Frank Kaspar
Adv. Sci. Res., 13, 97-105, doi:10.5194/asr-13-97-2016, 2016
To respond to the challenges of climate change, Angola, Botswana, Germany, Namibia, South Africa and Zambia have initiated the regional competence centre SASSCAL. As part of the initiative, Deutscher Wetterdienst (DWD) cooperates with the meteorological services of Angola, Botswana and Zambia to improve the management of climate data. First results of the cooperation between DWD and the Angolan Meteorological Services (INAMET) are presented in order to provide hints for comparable activities.
- Validation of three satellite-derived databases of surface solar radiation
using measurements performed at 42 stations in Brazil
Abstract: Validation of three satellite-derived databases of surface solar radiation using measurements performed at 42 stations in Brazil
Claire Thomas, Etienne Wey, Philippe Blanc, and Lucien Wald
Adv. Sci. Res., 13, 81-86, doi:10.5194/asr-13-81-2016, 2016
Several satellite-derived solar surface irradiance databases provide long-term and homogeneously distributed information on the solar potential at ground level. This paper presents the validation results of three of these databases: HelioClim-3 (versions 4 and 5) and the CAMS radiation service, versus the measurements of 42 stations in Brazil. Despite a slight overestimation of the CAMS radiation service, the three databases are suitable for studies of the solar resources in Brazil.
- Delivery and communication of severe weather events in Basque Country: the
Abstract: Delivery and communication of severe weather events in Basque Country: the Euskalmet case
Santiago Gaztelumendi, Iñaki Orbe, Onintze Salazar, Ana Lopez, José Antonio Aranda, and Pedro Anitua
Adv. Sci. Res., 13, 87-90, doi:10.5194/asr-13-87-2016, 2016
In this work we briefly introduce some aspects about delivery andcommunication of severe weather events in Basque Country, explaining what isconsidered severe weather by the Basque Meteorology Agency (Euskalmet) inthe context of Basque Country. We include a short description of someproducts generated for different purposes during such events, presentingdifferent aspects related with delivery and communication processes in theoperational context of Euskalmet. We review some real examples on severeweather communication and message dissemination in Basque Country. Finally,some conclusions about our experience are presented.
- The new Euskalmet coastal–maritime warning system
Abstract: The new Euskalmet coastal–maritime warning system
Santiago Gaztelumendi, Joseba Egaña, Pedro Liria, Manuel Gonzalez, José Antonio Aranda, and Pedro Anitua
Adv. Sci. Res., 13, 91-96, doi:10.5194/asr-13-91-2016, 2016
This work presents the main characteristics of the Basque Meteorology Agency(Euskalmet) maritime–coastal risk warning system, with special emphasis onthe latest updates, including a clear differentiation on specific warningmessages addressing sea conditions for navigation purposes in the first 2nautical miles, and expected coastal impacts. Some details of the warning bulletinfor maritime and coastal risk situations are also presented, together withother communication products and strategies used in coastal and maritimesevere episodes at the Basque coast.
Today, three different aspects are included in the coastal–maritime riskwarning system in Basque Country, related to the main potential severeevents that affecting coastal activities.
– "Galerna" risk relates to a sudden wind reversal that can severelyaffect coastal navigation and recreational activities.
– "Navigation" risk relates to severe sea state conditions for 0–2 miles, affecting different navigation activities.
– "Coastal impact" risk relates to adverse wave characteristics andtidal surges that induce flooding events and different impacts in littoral areas.
- Twenty-first century wave climate projections for Ireland and surface
winds in the North Atlantic Ocean
Abstract: Twenty-first century wave climate projections for Ireland and surface winds in the North Atlantic Ocean
Sarah Gallagher, Emily Gleeson, Roxana Tiron, Ray McGrath, and Frédéric Dias
Adv. Sci. Res., 13, 75-80, doi:10.5194/asr-13-75-2016, 2016
As an island located in the North Atlantic Ocean with a highly energetic wave and wind climate, Ireland is uniquely placed in terms of its ocean renewable energy resource. The socio-economic importance of this resource makes it a priority to quantify how the wave and wind climate may change in the future. We examine how surface winds in the North Atlantic Ocean may change towards the end of this century due to global climate change, and how these changes may affect Ireland's wave climate.
- Improvement of Solar and Wind forecasting in southern Italy through a
multi-model approach: preliminary results
Abstract: Improvement of Solar and Wind forecasting in southern Italy through a multi-model approach: preliminary results
Elenio Avolio, Rosa Claudia Torcasio, Teresa Lo Feudo, Claudia Roberta Calidonna, Daniele Contini, and Stefano Federico
Adv. Sci. Res., 13, 69-73, doi:10.5194/asr-13-69-2016, 2016
The improvement of the Solar and Wind short-term forecasting represents a critical goal for the weather prediction community and is of great importance for a better estimation of power production from solar and wind farms. In this work we analyze the performance of two deterministic models operational at ISAC-CNR for the prediction of short-wave irradiance and wind speed, at two experimental sites in southern Italy.
- Representation of the grey zone of turbulence in the atmospheric boundary
Abstract: Representation of the grey zone of turbulence in the atmospheric boundary layer
Adv. Sci. Res., 13, 63-67, doi:10.5194/asr-13-63-2016, 2016
Numerical weather prediction model forecasts at hectometric resolution are now possible. This range of scales is called the "grey zone of turbulence" as turbulence structures are neither mainly resolved nor entirely subgrid. Turbulence parametrizations have to be adapted, and the adaptations at these scales depend on the existing parametrizations at larger or smaller scales. This study explains the modifications in current Météo France models to the grey zone of turbulence.