aariПроблемы Арктики и АнтарктикиArctic and Antarctic Research0555-26482618-6713Государственный научный центр Российской Федерации Арктический и антарктический научно-исследовательский институт10.30758/0555-2648-2021-67-2-147-164aari-352Research ArticleМЕТЕОРОЛОГИЯ И КЛИМАТОЛОГИЯMETEOROLOGY AND CLIMATOLOGYEvaluation of coastal Antarctic precipitation in LMDz6 global atmospheric model using ground-based radar observationsEvaluation of coastal Antarctic precipitation in LMDz6 global atmospheric model using ground-based radar observationsLemonnierF.LemonnierF.

F-75005 Paris; F-75004 Paris

F-75005 Paris; F-75004 Paris

ChemisonA.ChemisonA.

CE Saclay

CE Saclay

KrinnerG.KrinnerG.

Grenoble

Grenoble

MadeleineJ.-B.MadeleineJ.-B.

F-75005 Paris

F-75005 Paris

ClaudC.ClaudC.

F-75005 Paris

F-75005 Paris

GenthonC.GenthonC.

F-75005 Paris

F-75005 Paris

Sorbonne Université, École normale supérieure, PSL Research University, École polytechnique, CNRS, Laboratoire de Météorologie dynamique, LMD/IPSL; Escape ProductionsФранцияSorbonne Université, École normale supérieure, PSL Research University, École polytechnique, CNRS, Laboratoire de Météorologie dynamique, LMD/IPSL; Escape ProductionsFranceLaboratoire des Sciences du Climat et de l’Environnement, CNRS-CEA-UVSQ – UMR8212ФранцияLaboratoire des Sciences du Climat et de l’Environnement, CNRS-CEA-UVSQ – UMR8212FranceUniversité Grenoble Alpes, CNRS, Institut des Géosciences de l’EnvironnementФранцияUniversité Grenoble Alpes, CNRS, Institut des Géosciences de l’EnvironnementFrance202109072021672147164Copyright © Lemonnier F., Chemison A., Krinner G., Madeleine J., Claud C., Genthon C., 20212021Lemonnier F., Chemison A., Krinner G., Madeleine J., Claud C., Genthon C.Lemonnier F., Chemison A., Krinner G., Madeleine J., Claud C., Genthon C.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.aaresearch.science/jour/article/view/352

In the current context of climate change in the poles, one of the objectives of the APRES3 (Antarctic Precipitation Remote Sensing from Surface and Space) project was to characterize the vertical structure of precipitation in order to better simulate it. Precipitation simulated by models in Antarctica is currently very widespread and it overestimates the data. Sensitivity studies have been conducted using a global climate model and compared to the observations obtained at the Dumont d’Urville coast station, obtained by a Micro Rain Radar (MRR). The LMDz/IPSL general circulation model, with zoomed configuration over Dumont d’Urville, has been considered for this study. A sensitivity study was conducted on the physical and numerical parameters of the LMDz model with the aim of estimating their contribution to the precipitation simulation. Sensitivity experiments revealed that changes in the sedimentation and sublimation parameters do not significantly impact precipitation rate. However, dissipation of the LMDz model, which is a numerical process that dissipates spatially excessive energy and keeps the model stable, impacts precipitation indirectly but very strongly. A suitable adjustment of the dissipation reduces significantly precipitation over Antarctic peripheral area, thus providing a simulated profile in better agreement with the MRR observations.

In the current context of climate change in the poles, one of the objectives of the APRES3 (Antarctic Precipitation Remote Sensing from Surface and Space) project was to characterize the vertical structure of precipitation in order to better simulate it. Precipitation simulated by models in Antarctica is currently very widespread and it overestimates the data. Sensitivity studies have been conducted using a global climate model and compared to the observations obtained at the Dumont d’Urville coast station, obtained by a Micro Rain Radar (MRR). The LMDz/IPSL general circulation model, with zoomed configuration over Dumont d’Urville, has been considered for this study. A sensitivity study was conducted on the physical and numerical parameters of the LMDz model with the aim of estimating their contribution to the precipitation simulation. Sensitivity experiments revealed that changes in the sedimentation and sublimation parameters do not significantly impact precipitation rate. However, dissipation of the LMDz model, which is a numerical process that dissipates spatially excessive energy and keeps the model stable, impacts precipitation indirectly but very strongly. A suitable adjustment of the dissipation reduces significantly precipitation over Antarctic peripheral area, thus providing a simulated profile in better agreement with the MRR observations.

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The authors declare that there are no conflicts of interest present.