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DOI | 10.1007/s00382-017-3912-6 |
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; Nikiema, Oumarou; Lucas-Picher, Philippe; Laprise, Rene; Hernandez-Diaz, Leticia; Winger, Katja | |
2018-07-01 | |
发表期刊 | CLIMATE DYNAMICS
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ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2018 |
卷号 | 51页码:161-186 |
文章类型 | Article |
语种 | 英语 |
国家 | Canada |
英文摘要 | 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. |
英文关键词 | Regional climate modelling CRCM5 CORDEX Climate change projections Arctic Dynamical downscaling SST bias correction |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000435522000010 |
WOS关键词 | MULTISCALE GEM MODEL ; BOUNDARY-LAYER ; NORTH-AMERICA ; PART I ; SIMULATIONS ; PERFORMANCE ; PARAMETERIZATION ; CIRCULATION ; PROJECTIONS ; PRESSURE |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/36374 |
专题 | 气候变化 |
作者单位 | Univ Quebec Montreal UQAM, Ctr ESCER Etud & Simulat Climat Echelle Reg, Dept Sci Terre & Atmosphere, Montreal, PQ, Canada |
推荐引用方式 GB/T 7714 | Takhsha, Maryam,Nikiema, Oumarou,Lucas-Picher, Philippe,et al. 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[J]. CLIMATE DYNAMICS,2018,51:161-186. |
APA | Takhsha, Maryam,Nikiema, Oumarou,Lucas-Picher, Philippe,Laprise, Rene,Hernandez-Diaz, Leticia,&Winger, Katja.(2018).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,51,161-186. |
MLA | Takhsha, Maryam,et al."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 51(2018):161-186. |
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