Dynamical downscaling with the fifth-generation Canadian regional climate model (CRCM5) over the CORDEX Arctic domain: effect of large-scale spectral nudging and of empirical correction of sea-surface temperature
As part of the CORDEX project, the fifth-generation Canadian Regional Climate Model (CRCM5) is used over the Arctic for climate simulations driven by reanalyses and by the MPI-ESM-MR coupled global climate model (CGCM) under the RCP8.5 scenario. The CRCM5 shows adequate skills capturing general feat...
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ftunivquebec:oai:archipel.uqam.ca:10539 2023-07-16T03:55:33+02:00 Dynamical downscaling with the fifth-generation Canadian regional climate model (CRCM5) over the CORDEX Arctic domain: effect of large-scale spectral nudging and of empirical correction of sea-surface temperature Takhsha, Maryam Nikiéma, Oumarou Lucas-Picher, Philippe Laprise, René Hernández-Díaz, Leticia Winger, Katja 2017 application/pdf http://archipel.uqam.ca/10539/1/Takhsha_et_al_ClimDyn_s00382-017-3912-6.pdf en eng http://archipel.uqam.ca/10539/ http://dx.doi.org/10.1007/s00382-017-3912-6 doi:10.1007/s00382-017-3912-6 http://archipel.uqam.ca/10539/1/Takhsha_et_al_ClimDyn_s00382-017-3912-6.pdf Takhsha, Maryam; Nikiéma, Oumarou; Lucas-Picher, Philippe; Laprise, René; Hernández-Díaz, Leticia et Winger, Katja (2017). « Dynamical downscaling with the fifth-generation Canadian regional climate model (CRCM5) over the CORDEX Arctic domain: effect of large-scale spectral nudging and of empirical correction of sea-surface temperature ». Climate Dynamics. Regional climate modelling CRCM5 CORDEX Climate change projections Arctic Dynamical downscaling SST bias correction Article de revue scientifique PeerReviewed 2017 ftunivquebec https://doi.org/10.1007/s00382-017-3912-6 2023-06-24T23:20:51Z As part of the CORDEX project, the fifth-generation Canadian Regional Climate Model (CRCM5) is used over the Arctic for climate simulations driven by reanalyses and by the MPI-ESM-MR coupled global climate model (CGCM) under the RCP8.5 scenario. The CRCM5 shows adequate skills capturing general features of mean sea level pressure (MSLP) for all seasons. Evaluating 2-m temperature (T2m) and precipitation is more problematic, because of inconsistencies between observational reference datasets over the Arctic that suffer of a sparse distribution of weather stations. In our study, we additionally investigated the effect of large-scale spectral nudging (SN) on the hindcast simulation driven by reanalyses. The analysis shows that SN is effective in reducing the spring MSLP bias, but otherwise it has little impact. We have also conducted another experiment in which the CGCM-simulated sea-surface temperature (SST) is empirically corrected and used as lower boundary conditions over the ocean for an atmosphere-only global simulation (AGCM), which in turn provides the atmospheric lateral boundary conditions to drive the CRCM5 simulation. This approach, so-called 3-step approach of dynamical downscaling (CGCM-AGCM-RCM), which had considerably improved the CRCM5 historical simulations over Africa, exhibits reduced impact over the Arctic domain. The most notable positive effect over the Arctic is a reduction of the T2m bias over the North Pacific Ocean and the North Atlantic Ocean in all seasons. Future projections using this method are compared with the results obtained with the traditional 2-step dynamical downscaling (CGCM-RCM) to assess the impact of correcting systematic biases of SST upon future-climate projections. The future projections are mostly similar for the two methods, except for precipitation. Text Arctic Arctic Climate change North Atlantic UQAM - Université du Québec à Montréal: archipel Arctic Pacific Climate Dynamics 51 1-2 161 186 |
institution |
Open Polar |
collection |
UQAM - Université du Québec à Montréal: archipel |
op_collection_id |
ftunivquebec |
language |
English |
topic |
Regional climate modelling CRCM5 CORDEX Climate change projections Arctic Dynamical downscaling SST bias correction |
spellingShingle |
Regional climate modelling CRCM5 CORDEX Climate change projections Arctic Dynamical downscaling SST bias correction Takhsha, Maryam Nikiéma, Oumarou Lucas-Picher, Philippe Laprise, René Hernández-Díaz, Leticia Winger, Katja Dynamical downscaling with the fifth-generation Canadian regional climate model (CRCM5) over the CORDEX Arctic domain: effect of large-scale spectral nudging and of empirical correction of sea-surface temperature |
topic_facet |
Regional climate modelling CRCM5 CORDEX Climate change projections Arctic Dynamical downscaling SST bias correction |
description |
As part of the CORDEX project, the fifth-generation Canadian Regional Climate Model (CRCM5) is used over the Arctic for climate simulations driven by reanalyses and by the MPI-ESM-MR coupled global climate model (CGCM) under the RCP8.5 scenario. The CRCM5 shows adequate skills capturing general features of mean sea level pressure (MSLP) for all seasons. Evaluating 2-m temperature (T2m) and precipitation is more problematic, because of inconsistencies between observational reference datasets over the Arctic that suffer of a sparse distribution of weather stations. In our study, we additionally investigated the effect of large-scale spectral nudging (SN) on the hindcast simulation driven by reanalyses. The analysis shows that SN is effective in reducing the spring MSLP bias, but otherwise it has little impact. We have also conducted another experiment in which the CGCM-simulated sea-surface temperature (SST) is empirically corrected and used as lower boundary conditions over the ocean for an atmosphere-only global simulation (AGCM), which in turn provides the atmospheric lateral boundary conditions to drive the CRCM5 simulation. This approach, so-called 3-step approach of dynamical downscaling (CGCM-AGCM-RCM), which had considerably improved the CRCM5 historical simulations over Africa, exhibits reduced impact over the Arctic domain. The most notable positive effect over the Arctic is a reduction of the T2m bias over the North Pacific Ocean and the North Atlantic Ocean in all seasons. Future projections using this method are compared with the results obtained with the traditional 2-step dynamical downscaling (CGCM-RCM) to assess the impact of correcting systematic biases of SST upon future-climate projections. The future projections are mostly similar for the two methods, except for precipitation. |
format |
Text |
author |
Takhsha, Maryam Nikiéma, Oumarou Lucas-Picher, Philippe Laprise, René Hernández-Díaz, Leticia Winger, Katja |
author_facet |
Takhsha, Maryam Nikiéma, Oumarou Lucas-Picher, Philippe Laprise, René Hernández-Díaz, Leticia Winger, Katja |
author_sort |
Takhsha, Maryam |
title |
Dynamical downscaling with the fifth-generation Canadian regional climate model (CRCM5) over the CORDEX Arctic domain: effect of large-scale spectral nudging and of empirical correction of sea-surface temperature |
title_short |
Dynamical downscaling with the fifth-generation Canadian regional climate model (CRCM5) over the CORDEX Arctic domain: effect of large-scale spectral nudging and of empirical correction of sea-surface temperature |
title_full |
Dynamical downscaling with the fifth-generation Canadian regional climate model (CRCM5) over the CORDEX Arctic domain: effect of large-scale spectral nudging and of empirical correction of sea-surface temperature |
title_fullStr |
Dynamical downscaling with the fifth-generation Canadian regional climate model (CRCM5) over the CORDEX Arctic domain: effect of large-scale spectral nudging and of empirical correction of sea-surface temperature |
title_full_unstemmed |
Dynamical downscaling with the fifth-generation Canadian regional climate model (CRCM5) over the CORDEX Arctic domain: effect of large-scale spectral nudging and of empirical correction of sea-surface temperature |
title_sort |
dynamical downscaling with the fifth-generation canadian regional climate model (crcm5) over the cordex arctic domain: effect of large-scale spectral nudging and of empirical correction of sea-surface temperature |
publishDate |
2017 |
url |
http://archipel.uqam.ca/10539/1/Takhsha_et_al_ClimDyn_s00382-017-3912-6.pdf |
geographic |
Arctic Pacific |
geographic_facet |
Arctic Pacific |
genre |
Arctic Arctic Climate change North Atlantic |
genre_facet |
Arctic Arctic Climate change North Atlantic |
op_relation |
http://archipel.uqam.ca/10539/ http://dx.doi.org/10.1007/s00382-017-3912-6 doi:10.1007/s00382-017-3912-6 http://archipel.uqam.ca/10539/1/Takhsha_et_al_ClimDyn_s00382-017-3912-6.pdf Takhsha, Maryam; Nikiéma, Oumarou; Lucas-Picher, Philippe; Laprise, René; Hernández-Díaz, Leticia et Winger, Katja (2017). « Dynamical downscaling with the fifth-generation Canadian regional climate model (CRCM5) over the CORDEX Arctic domain: effect of large-scale spectral nudging and of empirical correction of sea-surface temperature ». Climate Dynamics. |
op_doi |
https://doi.org/10.1007/s00382-017-3912-6 |
container_title |
Climate Dynamics |
container_volume |
51 |
container_issue |
1-2 |
container_start_page |
161 |
op_container_end_page |
186 |
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1771541771507990528 |