Subjects -> EARTH SCIENCES (Total: 771 journals)
    - EARTH SCIENCES (527 journals)
    - GEOLOGY (94 journals)
    - GEOPHYSICS (33 journals)
    - HYDROLOGY (29 journals)
    - OCEANOGRAPHY (88 journals)

EARTH SCIENCES (527 journals)            First | 1 2 3     

Showing 201 - 371 of 371 Journals sorted alphabetically
Hydrological Processes     Hybrid Journal   (Followers: 43)
Hydrology and Earth System Sciences     Open Access   (Followers: 38)
ICES Journal of Marine Science: Journal du Conseil     Hybrid Journal   (Followers: 53)
IEEE Geoscience and Remote Sensing Letters     Hybrid Journal   (Followers: 148)
IEEE Geoscience and Remote Sensing Magazine     Hybrid Journal   (Followers: 6)
IEEE Journal of Oceanic Engineering     Hybrid Journal   (Followers: 11)
Indian Geotechnical Journal     Hybrid Journal   (Followers: 4)
Indonesian Journal on Geoscience     Open Access   (Followers: 1)
Inland Waters     Hybrid Journal  
Innovative Infrastructure Solutions     Hybrid Journal  
Interdisciplinary Environmental Review     Hybrid Journal   (Followers: 3)
International Geology Review     Hybrid Journal   (Followers: 17)
International Journal of Advanced Geosciences     Open Access   (Followers: 2)
International Journal of Advanced Remote Sensing and GIS     Open Access   (Followers: 50)
International Journal of Applied Earth Observation and Geoinformation     Open Access   (Followers: 36)
International Journal of Coal Geology     Hybrid Journal   (Followers: 2)
International Journal of Disaster Risk Reduction     Hybrid Journal   (Followers: 18)
International Journal of Earth Sciences     Hybrid Journal   (Followers: 37)
International Journal of Earthquake and Impact Engineering     Hybrid Journal   (Followers: 4)
International Journal of Energetic Materials     Full-text available via subscription  
International Journal of Environment and Geoinformatics     Open Access   (Followers: 4)
International Journal of Geo-Engineering     Open Access   (Followers: 2)
International Journal of Geographical Information Science     Hybrid Journal   (Followers: 55)
International Journal of Geomechanics     Full-text available via subscription   (Followers: 6)
International Journal of Geosciences     Open Access   (Followers: 10)
International Journal of Geosynthetics and Ground Engineering     Full-text available via subscription   (Followers: 3)
International Journal of Geotechnical Earthquake Engineering     Full-text available via subscription   (Followers: 9)
International Journal of Image and Data Fusion     Hybrid Journal   (Followers: 3)
International Journal of Remote Sensing     Hybrid Journal   (Followers: 144)
International Journal of Remote Sensing Applications     Open Access   (Followers: 49)
International Journal of Soil, Sediment and Water     Open Access   (Followers: 4)
International Journal of Speleology     Open Access   (Followers: 3)
Iraqi National Journal of Earth Sciences     Open Access  
iScience     Open Access   (Followers: 1)
Island Arc     Hybrid Journal   (Followers: 5)
ISPRS International Journal of Geo-Information     Open Access   (Followers: 5)
Italian Journal of Geosciences     Open Access  
Izvestiya, Atmospheric and Oceanic Physics     Full-text available via subscription   (Followers: 1)
Izvestiya, Physics of the Solid Earth     Hybrid Journal   (Followers: 2)
Jahresberichte und Mitteilungen des Oberrheinischen Geologischen Vereins     Full-text available via subscription   (Followers: 2)
JETP Letters     Hybrid Journal   (Followers: 3)
Journal of Earth Science & Climatic Change     Open Access   (Followers: 14)
Journal of Advances in Modeling Earth Systems     Open Access   (Followers: 5)
Journal of African Earth Sciences     Hybrid Journal   (Followers: 11)
Journal of Analytical and Numerical Methods in Mining Engineering     Open Access  
Journal of Applied Geophysics     Hybrid Journal   (Followers: 15)
Journal of Applied Volcanology     Open Access   (Followers: 7)
Journal of Arid Land     Hybrid Journal  
Journal of Asian Earth Sciences     Hybrid Journal   (Followers: 15)
Journal of Asian Earth Sciences : X     Open Access  
Journal of Atmospheric and Oceanic Technology     Hybrid Journal   (Followers: 33)
Journal of Atmospheric and Solar-Terrestrial Physics     Hybrid Journal   (Followers: 133)
Journal of Big History     Open Access   (Followers: 3)
Journal of Coastal Conservation     Hybrid Journal   (Followers: 6)
Journal of Coastal Research     Hybrid Journal   (Followers: 31)
Journal of Contemporary Physics (Armenian Academy of Sciences)     Hybrid Journal   (Followers: 9)
Journal of Contemporary Water Resource & Education     Hybrid Journal   (Followers: 2)
Journal of Earth Science     Hybrid Journal   (Followers: 12)
Journal of Earth System Science     Open Access   (Followers: 52)
Journal of Earth, Environment and Health Sciences     Open Access   (Followers: 2)
Journal of Earthquake and Tsunami     Hybrid Journal   (Followers: 2)
Journal of Earthquake Engineering     Hybrid Journal   (Followers: 14)
Journal of Environment and Earth Science     Open Access   (Followers: 11)
Journal of Environmental & Engineering Geophysics     Hybrid Journal   (Followers: 2)
Journal of Geodesy     Hybrid Journal   (Followers: 9)
Journal of Geodesy and Geoinformation     Open Access   (Followers: 2)
Journal of Geodynamics     Hybrid Journal   (Followers: 6)
Journal of Geography, Environment and Earth Science International     Open Access  
Journal of Geology     Full-text available via subscription   (Followers: 30)
Journal of Geomorphology     Open Access   (Followers: 3)
Journal of Geophysical Research : Atmospheres     Partially Free   (Followers: 132)
Journal of Geophysical Research : Biogeosciences     Full-text available via subscription   (Followers: 34)
Journal of Geophysical Research : Earth Surface     Partially Free   (Followers: 59)
Journal of Geophysical Research : Oceans     Partially Free   (Followers: 60)
Journal of Geophysical Research : Planets     Full-text available via subscription   (Followers: 115)
Journal of Geophysical Research : Solid Earth     Full-text available via subscription   (Followers: 56)
Journal of Geophysical Research : Space Physics     Full-text available via subscription   (Followers: 134)
Journal of Geophysics and Engineering     Hybrid Journal   (Followers: 2)
Journal of Geoscience Education     Hybrid Journal   (Followers: 1)
Journal of Geoscience, Engineering, Environment, and Technology     Open Access   (Followers: 1)
Journal of Geosciences     Open Access   (Followers: 5)
Journal of Geosciences and Geomatics     Open Access   (Followers: 1)
Journal of Geospatial Applications in Natural Resources     Open Access  
Journal of Geotechnical and Geoenvironmental Engineering     Full-text available via subscription   (Followers: 30)
Journal of Geotechnical Engineering     Full-text available via subscription   (Followers: 4)
Journal of Great Lakes Research     Hybrid Journal   (Followers: 5)
Journal of Hydro-environment Research     Full-text available via subscription   (Followers: 13)
Journal of Hydrologic Engineering     Full-text available via subscription   (Followers: 40)
Journal of International Maritime Safety, Environmental Affairs, and Shipping     Open Access   (Followers: 1)
Journal of Life and Earth Science     Open Access  
Journal of Marine Medical Society     Open Access   (Followers: 1)
Journal of Marine Research     Full-text available via subscription   (Followers: 20)
Journal of Marine Science and Technology     Hybrid Journal   (Followers: 3)
Journal of Marine Systems     Hybrid Journal   (Followers: 9)
Journal of Metamorphic Geology     Hybrid Journal   (Followers: 15)
Journal of Mining Science     Hybrid Journal   (Followers: 2)
Journal of Mountain Science     Hybrid Journal  
Journal of Natural Gas Geoscience     Open Access  
Journal of Ocean and Climate     Open Access   (Followers: 9)
Journal of Oceanology and Limnology     Hybrid Journal   (Followers: 3)
Journal of Petroleum Exploration and Production Technology     Open Access   (Followers: 2)
Journal of Petroleum Science and Engineering     Hybrid Journal   (Followers: 3)
Journal of Petrology     Hybrid Journal   (Followers: 11)
Journal of Plasma Physics     Hybrid Journal   (Followers: 21)
Journal of Population and Sustainability     Open Access  
Journal of Quaternary Science     Hybrid Journal   (Followers: 31)
Journal of Rock Mechanics and Geotechnical Engineering     Open Access   (Followers: 3)
Journal of Sea Research     Hybrid Journal   (Followers: 6)
Journal of Sedimentary Environments     Open Access  
Journal of Seismology     Hybrid Journal   (Followers: 9)
Journal of Spatial Information Science     Open Access   (Followers: 4)
Journal of Structural Geology     Hybrid Journal   (Followers: 26)
Journal of Systematic Palaeontology     Hybrid Journal   (Followers: 7)
Journal of the Atmospheric Sciences     Hybrid Journal   (Followers: 83)
Journal of the Geological Society     Hybrid Journal   (Followers: 17)
Journal of the Royal Society of New Zealand     Hybrid Journal   (Followers: 48)
Journal of the World Aquaculture Society     Hybrid Journal   (Followers: 13)
Journal of Volcanology and Geothermal Research     Hybrid Journal   (Followers: 17)
Journal of Water and Climate Change     Open Access   (Followers: 52)
Journal on Geoinformatics, Nepal     Open Access   (Followers: 1)
Jurnal Ilmiah Perikanan dan Kelautan / Scientific Journal of Fisheries and Marine     Open Access  
Kartografija i geoinformacije (Cartography and Geoinformation)     Open Access  
Lake and Reservoir Management     Hybrid Journal   (Followers: 7)
Landslides     Hybrid Journal   (Followers: 26)
Latin American Journal of Sedimentology and Basin Analysis     Open Access   (Followers: 1)
Lethaia     Hybrid Journal   (Followers: 5)
Letters in Mathematical Physics     Hybrid Journal   (Followers: 4)
Limnologica     Hybrid Journal   (Followers: 4)
Limnology     Hybrid Journal   (Followers: 9)
Lithology and Mineral Resources     Hybrid Journal   (Followers: 3)
Lithos     Hybrid Journal   (Followers: 9)
Malaysian Journal of Geosciences     Open Access  
Marine and Freshwater Research     Hybrid Journal   (Followers: 6)
Marine and Petroleum Geology     Hybrid Journal   (Followers: 21)
Marine Biology Research: New for 2005     Hybrid Journal   (Followers: 2)
Marine Economics and Management     Open Access   (Followers: 2)
Marine Environmental Research     Hybrid Journal   (Followers: 31)
Marine Geodesy     Hybrid Journal   (Followers: 4)
Marine Geology     Hybrid Journal   (Followers: 31)
Marine Geophysical Researches     Hybrid Journal   (Followers: 5)
Marine Georesources & Geotechnology     Hybrid Journal  
Marine Mammal Science     Hybrid Journal   (Followers: 10)
Marine Policy     Hybrid Journal   (Followers: 60)
Mathematical Geosciences     Hybrid Journal   (Followers: 4)
Mathematical Physics, Analysis and Geometry     Hybrid Journal   (Followers: 3)
Mediterranean Geoscience Reviews     Hybrid Journal  
Meteoritics & Planetary Science     Hybrid Journal   (Followers: 18)
Meteorologische Zeitschrift     Full-text available via subscription   (Followers: 4)
Mineralium Deposita     Hybrid Journal   (Followers: 4)
Mineralogia     Open Access   (Followers: 2)
Mineralogy and Petrology     Hybrid Journal   (Followers: 2)
Mineria y Geologia     Open Access  
Mining, Metallurgy & Exploration     Hybrid Journal  
Momona Ethiopian Journal of Science     Open Access   (Followers: 5)
Mongolian Geoscientist     Open Access  
Moscow University Geology Bulletin     Hybrid Journal  
Moscow University Physics Bulletin     Hybrid Journal  
Natural Hazards     Hybrid Journal   (Followers: 53)
Natural Hazards and Earth System Sciences (NHESS)     Open Access   (Followers: 10)
Natural Hazards and Earth System Sciences Discssions     Open Access  
Natural Hazards Research     Open Access  
Natural Hazards Review     Full-text available via subscription   (Followers: 16)
Natural Resources & Engineering     Hybrid Journal  
Natural Resources Research     Hybrid Journal   (Followers: 8)
Nature Geoscience     Full-text available via subscription   (Followers: 161)
Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen     Full-text available via subscription   (Followers: 3)
Neues Jahrbuch für Mineralogie - Abhandlungen     Full-text available via subscription   (Followers: 1)
Newsletters on Stratigraphy     Full-text available via subscription   (Followers: 2)
Nonlinear Processes in Geophysics (NPG)     Open Access  
Nonlinear Processes in Geophysics Discussions     Open Access  
Ocean & Coastal Management     Hybrid Journal   (Followers: 62)
Ocean Development & International Law     Hybrid Journal   (Followers: 15)
Ocean Dynamics     Hybrid Journal   (Followers: 6)
Ocean Engineering     Hybrid Journal   (Followers: 6)
Ocean Modelling     Hybrid Journal   (Followers: 12)
Ocean Science (OS)     Open Access   (Followers: 7)
Ocean Science Journal     Hybrid Journal   (Followers: 6)
Open Geospatial Data, Software and Standards     Open Access   (Followers: 3)
Open Journal of Earthquake Research     Open Access   (Followers: 3)
Open Journal of Soil Science     Open Access   (Followers: 9)
Ore and Energy Resource Geology     Open Access  
Ore Geology Reviews     Hybrid Journal   (Followers: 11)
Organic Geochemistry     Hybrid Journal   (Followers: 4)
Osterreichische Wasser- und Abfallwirtschaft     Hybrid Journal  
Paläontologische Zeitschrift     Hybrid Journal   (Followers: 4)
Papers in Palaeontology     Hybrid Journal  
Permafrost and Periglacial Processes     Hybrid Journal   (Followers: 5)
Perspectives of Earth and Space Scientists i     Open Access   (Followers: 1)
Petroleum Geoscience     Hybrid Journal   (Followers: 5)
Petroleum Science     Open Access  
Petrology     Full-text available via subscription   (Followers: 6)
PFG : Journal of Photogrammetry, Remote Sensing and Geoinformation Science     Hybrid Journal   (Followers: 4)
Photogrammetrie - Fernerkundung - Geoinformation     Full-text available via subscription  
Physical Geography     Hybrid Journal   (Followers: 8)
Physical Science International Journal     Open Access  
Physics of Life Reviews     Hybrid Journal   (Followers: 1)
Physics of Metals and Metallography     Hybrid Journal   (Followers: 18)
Physics of Plasmas     Hybrid Journal   (Followers: 10)
Physics of the Earth and Planetary Interiors     Hybrid Journal   (Followers: 34)
Physics of the Solid State     Hybrid Journal   (Followers: 7)

  First | 1 2 3     

Similar Journals
Journal Cover
Nonlinear Processes in Geophysics (NPG)
Journal Prestige (SJR): 0.61
Citation Impact (citeScore): 2
Number of Followers: 0  

  This is an Open Access Journal Open Access journal
ISSN (Print) 1023-5809 - ISSN (Online) 1607-7946
Published by Copernicus Publications Homepage  [54 journals]
  • Lévy noise versus Gaussian-noise-induced transitions in the
           Ghil–Sellers energy balance model

    • Abstract: Lévy noise versus Gaussian-noise-induced transitions in the Ghil–Sellers energy balance model
      Valerio Lucarini, Larissa Serdukova, and Georgios Margazoglou
      Nonlin. Processes Geophys., 29, 183–205, https://doi.org/10.5194/npg-29-183-2022, 2022
      In most of the investigations on metastable systems, the stochastic forcing is modulated by Gaussian noise. Lévy noise laws, which describe jump processes, have recently received a lot of attention, but much less is known. We study stochastic versions of the Ghil–Sellers energy balance model, and we highlight the fundamental difference between how transitions are performed between the competing warm and snowball states, depending on whether Gaussian or Lévy noise acts as forcing.
      PubDate: Wed, 11 May 2022 10:18:50 +020
      DOI: 10.5194/npg-29-183-2022 2022

       
  • Using neural networks to improve simulations in the gray zone

    • Abstract: Using neural networks to improve simulations in the gray zone
      Raphael Kriegmair, Yvonne Ruckstuhl, Stephan Rasp, and George Craig
      Nonlin. Processes Geophys., 29, 171–181, https://doi.org/10.5194/npg-29-171-2022, 2022
      Our regional numerical weather prediction models run at kilometer-scale resolutions. Processes that occur at smaller scales not yet resolved contribute significantly to the atmospheric flow. We use a neural network (NN) to represent the unresolved part of physical process such as cumulus clouds. We test this approach on a simplified, yet representative, 1D model and find that the NN corrections vastly improve the model forecast up to a couple of days.
      PubDate: Mon, 02 May 2022 14:28:25 +020
      DOI: 10.5194/npg-29-171-2022 2022

       
  • Estimate of energy loss from internal solitary waves breaking on slopes

    • Abstract: Estimate of energy loss from internal solitary waves breaking on slopes
      Kateryna Terletska and Vladimir Maderich
      Nonlin. Processes Geophys., 29, 161–170, https://doi.org/10.5194/npg-29-161-2022, 2022
      Internal solitary waves (ISWs) emerge in the ocean and seas in various forms and break on the shelf zones in a variety of ways. This results in intensive mixing that affects processes such as biological productivity and sediment transport. Mechanisms of wave interaction with slopes are related to breaking and changing polarity. Our study focuses on wave transformation over idealized shelf-slope topography using a two-layer stratification. Four types of ISW transformation over slopes are shown.
      PubDate: Thu, 07 Apr 2022 17:38:59 +020
      DOI: 10.5194/npg-29-161-2022 2022

       
  • Regional study of mode-2 internal solitary waves at the Pacific coast of
           Central America using marine seismic survey data

    • Abstract: Regional study of mode-2 internal solitary waves at the Pacific coast of Central America using marine seismic survey data
      Wenhao Fan, Haibin Song, Yi Gong, Shun Yang, and Kun Zhang
      Nonlin. Processes Geophys., 29, 141–160, https://doi.org/10.5194/npg-29-141-2022, 2022
      Compared with mode-1 internal solitary waves (ISWs), mode-2 ISWs in the ocean require further study. A mass of mode-2 ISWs developing at the Pacific coast of Central America have been imaged using seismic reflection data. We find that the relationship between the mode-2 ISW propagation speed and amplitude is diverse. It is affected by seawater depth, pycnocline depth, and pycnocline thickness. The ISW vertical amplitude structure is affected by the ISW nonlinearity and the pycnocline deviation.
      PubDate: Mon, 04 Apr 2022 17:38:59 +020
      DOI: 10.5194/npg-29-141-2022 2022

       
  • Using a Hybrid Optimal Interpolation-Ensemble Kalman Filter for the
           Canadian Precipitation Analysis

    • Abstract: Using a Hybrid Optimal Interpolation-Ensemble Kalman Filter for the Canadian Precipitation Analysis
      Dikraa Khedhaouiria, Stéphane Bélair, Vincent Fortin, Guy Roy, and Franck Lespinas
      Nonlin. Processes Geophys. Discuss., https//doi.org/10.5194/npg-2022-10,2022
      Preprint under review for NPG (discussion: open, 0 comments)
      This study introduces a well-known use of hybrid methods in data assimilation (DA) algorithms yet not explored for precipitation analyses. Our approach combined an ensemble-based DA approach with an existing deterministically based DA. Both DA scheme families have desirable aspects that can be leveraged if combined. The DA hybrid method showed better precipitation analyses in regions with a low rate of assimilated surface observations, which is typically the case in winter.
      PubDate: Mon, 04 Apr 2022 17:38:59 +020
      DOI: 10.5194/npg-2022-102022

       
  • Control simulation experiment with Lorenz's butterfly attractor

    • Abstract: Control simulation experiment with Lorenz's butterfly attractor
      Takemasa Miyoshi and Qiwen Sun
      Nonlin. Processes Geophys., 29, 133–139, https://doi.org/10.5194/npg-29-133-2022, 2022
      The weather is chaotic and hard to predict, but the chaos implies an effective control where a small control signal grows rapidly to make a big difference. This study proposes a control simulation experiment where we apply a small signal to control nature in a computational simulation. Idealized experiments with a low-order chaotic system show successful results by small control signals of only 3 % of the observation error. This is the first step toward realistic weather simulations.
      PubDate: Mon, 28 Mar 2022 14:35:48 +020
      DOI: 10.5194/npg-29-133-2022 2022

       
  • Characteristics of intrinsic non-stationarity and its effect on
           eddy-covariance measurements of CO2 fluxes

    • Abstract: Characteristics of intrinsic non-stationarity and its effect on eddy-covariance measurements of CO2 fluxes
      Lei Liu, Yu Shi, and Fei Hu
      Nonlin. Processes Geophys., 29, 123–131, https://doi.org/10.5194/npg-29-123-2022, 2022
      We find a new kind of non-stationarity. This new kind of non-stationarity is caused by the intrinsic randomness. Results show that the new kind of non-stationarity is widespread in small-scale variations of CO2 turbulent fluxes. This finding reminds us that we need to handle the short-term averaged turbulent fluxes carefully, and we also need to re-screen the existing non-stationarity diagnosis methods because they could make a wrong diagnosis due to this new kind of non-stationarity.
      PubDate: Thu, 24 Mar 2022 07:28:47 +010
      DOI: 10.5194/npg-29-123-2022 2022

       
  • Fortnight conditioning of historical data to improve short-term
           precipitation predictions

    • Abstract: Fortnight conditioning of historical data to improve short-term precipitation predictions
      Yoshito Hirata and Yoshinori Yamada
      Nonlin. Processes Geophys. Discuss., https//doi.org/10.5194/npg-2022-9,2022
      Preprint under review for NPG (discussion: open, 0 comments)
      We show that there exists some complicated days-of-week effects in precipitation at Tokyo. By using the effects, we could improve short-term precipitation forecasts up to 2 hours ahead.
      PubDate: Tue, 08 Mar 2022 14:49:34 +010
      DOI: 10.5194/npg-2022-92022

       
  • Applying prior correlations for ensemble-based spatial localization

    • Abstract: Applying prior correlations for ensemble-based spatial localization
      Chu-Chun Chang and Eugenia Kalnay
      Nonlin. Processes Geophys. Discuss., https//doi.org/10.5194/npg-2022-5,2022
      Preprint under review for NPG (discussion: open, 0 comments)
      This study introduces a new approach for optimizing the model initialization process, effectively reducing unrealistic error estimations and improving weather prediction. Our method uses the prescribed error correlations to limit the observation usage during the model initialization. The experiment results on the simplified atmosphere model show that our method has a similar performance as the traditional method, while it is better in the early stage and is more computationally efficient.
      PubDate: Tue, 01 Mar 2022 04:25:33 +010
      DOI: 10.5194/npg-2022-52022

       
  • Fractional relaxation noises, motions and the fractional energy balance
           equation

    • Abstract: Fractional relaxation noises, motions and the fractional energy balance equation
      Shaun Lovejoy
      Nonlin. Processes Geophys., 29, 93–121, https://doi.org/10.5194/npg-29-93-2022, 2022
      The difference between the energy that the Earth receives from the Sun and the energy it emits as black-body radiation is stored in a scaling hierarchy of structures in the ocean, soil and hydrosphere. The simplest scaling storage model leads to the fractional energy balance equation (FEBE). We examine the statistical properties of FEBE when it is driven by random fluctuations. In this paper, we explore the statistical properties of this mathematically simple yet neglected equation.
      PubDate: Fri, 25 Feb 2022 14:02:52 +010
      DOI: 10.5194/npg-29-93-2022 2022

       
  • Adaptive Smoothing of the Ensemble Mean of Climate Model Output for
           Improved Projections of Future Rainfall

    • Abstract: Adaptive Smoothing of the Ensemble Mean of Climate Model Output for Improved Projections of Future Rainfall
      Stephen Jewson, Giuliana Barbato, Paola Mercogliano, and Maximiliano Sassi
      Nonlin. Processes Geophys. Discuss., https//doi.org/10.5194/npg-2022-7,2022
      Preprint under review for NPG (discussion: open, 0 comments)
      It may be possible to make climate model projections more precise using spatial smoothing. We introduce a new spatial smoothing method that differs from previously used methods in that it varies the amount of smoothing by location. For the European rainfall projections we apply the method to, we show that the new method is three times more effective than standard smoothing methods. This improved precision may benefit applications of climate model projections.
      PubDate: Tue, 22 Feb 2022 14:02:52 +010
      DOI: 10.5194/npg-2022-72022

       
  • Ensemble Riemannian data assimilation: towards large-scale dynamical
           systems

    • Abstract: Ensemble Riemannian data assimilation: towards large-scale dynamical systems
      Sagar K. Tamang, Ardeshir Ebtehaj, Peter Jan van Leeuwen, Gilad Lerman, and Efi Foufoula-Georgiou
      Nonlin. Processes Geophys., 29, 77–92, https://doi.org/10.5194/npg-29-77-2022, 2022
      The outputs from Earth system models are optimally combined with satellite observations to produce accurate forecasts through a process called data assimilation. Many existing data assimilation methodologies have some assumptions regarding the shape of the probability distributions of model output and observations, which results in forecast inaccuracies. In this paper, we test the effectiveness of a newly proposed methodology that relaxes such assumptions about high-dimensional models.
      PubDate: Fri, 18 Feb 2022 14:14:14 +010
      DOI: 10.5194/npg-29-77-2022 2022

       
  • An approach for constraining mantle viscosities through assimilation of
           palaeo sea level data into a glacial isostatic adjustment model

    • Abstract: An approach for constraining mantle viscosities through assimilation of palaeo sea level data into a glacial isostatic adjustment model
      Reyko Schachtschneider, Jan Saynisch-Wagner, Volker Klemann, Meike Bagge, and Maik Thomas
      Nonlin. Processes Geophys., 29, 53–75, https://doi.org/10.5194/npg-29-53-2022, 2022
      Glacial isostatic adjustment is the delayed reaction of the Earth's lithosphere and mantle to changing mass loads of ice sheets or water. The deformation behaviour of the Earth's surface depends on the ability of the Earth's mantle to flow, i.e. its viscosity. It can be estimated from sea level observations, and in our study, we estimate mantle viscosity using sea level observations from the past. This knowledge is essential for understanding current sea level changes due to melting ice.
      PubDate: Thu, 17 Feb 2022 14:14:14 +010
      DOI: 10.5194/npg-29-53-2022 2022

       
  • Direct Bayesian model reduction of smaller scale convective activity
           conditioned on large-scale dynamics

    • Abstract: Direct Bayesian model reduction of smaller scale convective activity conditioned on large-scale dynamics
      Robert Polzin, Annette Müller, Henning Rust, Peter Névir, and Péter Koltai
      Nonlin. Processes Geophys., 29, 37–52, https://doi.org/10.5194/npg-29-37-2022, 2022
      In this study, a recent algorithmic framework called Direct Bayesian Model Reduction (DBMR) is applied which provides a scalable probability-preserving identification of reduced models directly from data. The stochastic method is tested in a meteorological application towards a model reduction to latent states of smaller scale convective activity conditioned on large-scale atmospheric flow.
      PubDate: Wed, 16 Feb 2022 14:14:14 +010
      DOI: 10.5194/npg-29-37-2022 2022

       
  • How many modes are needed to predict climate bifurcations' Lessons
           from an experiment

    • Abstract: How many modes are needed to predict climate bifurcations' Lessons from an experiment
      Bérengère Dubrulle, François Daviaud, Davide Faranda, Louis Marié, and Brice Saint-Michel
      Nonlin. Processes Geophys., 29, 17–35, https://doi.org/10.5194/npg-29-17-2022, 2022
      Present climate models discuss climate change but show no sign of bifurcation in the future. Is this because there is none or because they are in essence too simplified to be able to capture them' To get elements of an answer, we ran a laboratory experiment and discovered that the answer is not so simple.
      PubDate: Mon, 07 Feb 2022 14:14:14 +010
      DOI: 10.5194/npg-29-17-2022 2022

       
  • Predicting Sea Surface Temperatures with Coupled Reservoir Computers

    • Abstract: Predicting Sea Surface Temperatures with Coupled Reservoir Computers
      Benjamin Walleshauser and Erik Bollt
      Nonlin. Processes Geophys. Discuss., https//doi.org/10.5194/npg-2022-4,2022
      Preprint under review for NPG (discussion: open, 0 comments)
      As sea surface temperature is vital towards understanding the greater climate of the Earth and an important variable in weather prediction, we propose a model that effectively capitalizes on the reduced complexity of machine learning models while still being able to efficiently predict over a large spatial domain. We find that it is proficient at predicting the sea surface temperature at specific locations, as well as over the greater domain of the Earth’s oceans.
      PubDate: Wed, 02 Feb 2022 14:14:14 +010
      DOI: 10.5194/npg-2022-42022

       
  • Effects of Rotation and Topography on Internal Solitary Waves Governed by
           the Rotating-Gardner Equation

    • Abstract: Effects of Rotation and Topography on Internal Solitary Waves Governed by the Rotating-Gardner Equation
      Karl Helfrich and Lev Ostrovsky
      Nonlin. Processes Geophys. Discuss., https//doi.org/10.5194/npg-2022-3,2022
      Preprint under review for NPG (discussion: open, 0 comments)
      This paper studies internal solitary waves (ISWs) in the ocean under simultaneous action of the main defining factors: nonlinearity (quadratic and cubic), earth rotation, and depth variation. Both analytical (adiabatic) theory and numerical simulation are used in the study. The results show a complex interplay of the factors mentioned above that can result in amplification of the ISW or, on the contrary, its destruction. The calculations are made for realistic oceanic parameters.
      PubDate: Fri, 21 Jan 2022 14:14:14 +010
      DOI: 10.5194/npg-2022-32022

       
  • Climate Bifurcations in a Schwarzschild Equation Model of the Arctic
           Atmosphere

    • Abstract: Climate Bifurcations in a Schwarzschild Equation Model of the Arctic Atmosphere
      Kolja L. Kypke, William F. Langford, Gregory M. Lewis, and Allan R. Willms
      Nonlin. Processes Geophys. Discuss., https//doi.org/10.5194/npg-2022-2,2022
      Preprint under review for NPG (discussion: open, 0 comments)
      Climate change is causing rapid temperature increases in the polar regions. A fundamental question is whether these temperature increases are reversible. If we control carbon dioxide emissions will the temperatures revert, or will we have passed a tipping point beyond which return to the present state is impossible' Our mathematical model of the Arctic climate indicates that under present emissions the Arctic climate will change irreversibly to a warm climate before the end of the century.
      PubDate: Wed, 19 Jan 2022 04:57:59 +010
      DOI: 10.5194/npg-2022-22022

       
  • Rigid Sets and Coherent Sets in Realistic Ocean Flows

    • Abstract: Rigid Sets and Coherent Sets in Realistic Ocean Flows
      Florian Feppon and Pierre Lermusiaux
      Nonlin. Processes Geophys. Discuss., https//doi.org/10.5194/npg-2022-1,2022
      Preprint under review for NPG (discussion: open, 0 comments)
      We develop and showcase new methods to extract Lagrangian Coherent Sets from ocean flow data and simulations. The first method extracts “rigid sets” defined as ocean regions that evolve almost as a rigid object. The second method is a matrix-free methodology that provides a simple and efficient framework to compute “coherent sets” with operator methods. We showcase results using three numerically simulated flow examples, including complex ocean current fields in the Palau Island region.
      PubDate: Wed, 12 Jan 2022 15:01:54 +010
      DOI: 10.5194/npg-2022-12022

       
  • A waveform skewness index for measuring time series nonlinearity and its
           applications to the ENSO–Indian monsoon relationship

    • Abstract: A waveform skewness index for measuring time series nonlinearity and its applications to the ENSO–Indian monsoon relationship
      Justin Schulte, Frederick Policelli, and Benjamin Zaitchik
      Nonlin. Processes Geophys., 29, 1–15, https://doi.org/10.5194/npg-29-1-2022, 2022
      The skewness of a time series is commonly used to quantify the extent to which positive (negative) deviations from the mean are larger than negative (positive) ones. However, in some cases, traditional skewness may not provide reliable information about time series skewness, motivating the development of a waveform skewness index in this paper. The waveform skewness index is used to show that changes in the relationship strength between climate time series could arise from changes in skewness.
      PubDate: Mon, 10 Jan 2022 15:01:54 +010
      DOI: 10.5194/npg-29-1-2022 2022

       
 
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