Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1007/s00382-016-3201-9 |
3-Step dynamical downscaling with empirical correction of sea-surface conditions: application to a CORDEX Africa simulation | |
Hernandez-Diaz, Leticia; Laprise, Ren; Nikiema, Oumarou; Winger, Katja | |
2017-04-01 | |
发表期刊 | CLIMATE DYNAMICS |
ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2017 |
卷号 | 48 |
文章类型 | Article |
语种 | 英语 |
国家 | Canada |
英文摘要 | Dynamical downscaling of climate projections over a limited-area domain using a Regional Climate Model (RCM) requires boundary conditions (BC) from a Coupled Global Climate Model (CGCM) simulation. Biases in CGCM-generated BC can have detrimental effects in RCM simulations, so attempts to improve the BC used to drive the RCM simulations are worth exploring. It is in this context that an empirical method involving the bias correction of the sea-surface conditions (SSCs; sea-surface temperature and sea-ice concentration) simulated by a CGCM has been developed: The 3-step dynamical downscaling approach. The SSCs from a CGCM simulation are empirically corrected and used as lower BC over the ocean for an atmosphere-only global climate model (AGCM) simulation, which in turn provides the atmospheric lateral BC to drive the RCM simulation. We analyse the impact of this strategy on the simulation of the African climate, with a special attention to the West African Monsoon (WAM) precipitation, using the fifth-generation Canadian Regional Climate Model (CRCM5) over the CORDEX-Africa domain. The Earth System Model of the Max-Planck-Institut fur Meteorologie (MPI-ESM-LR) is used as CGCM and a global version of CRCM5 is used as AGCM. The results indicate that the historical climate is much improved, approaching the skill of reanalysis-driven hindcast simulations. The most remarkable effect of this approach is the positive impact on the simulation of all aspects of the WAM precipitation, mainly due to the correction of SSCs. In fact, our results show that proper sea surface temperature (SST) in the Gulf of Guinea is a necessary condition for an adequate simulation of WAM precipitation, especially over the equatorial region of West Africa. It was found that the climate-change projections under RCP4.5 scenario obtained with the 3-step approach are substantially different from those obtained with usual downscaling approach in which the RCM is directly driven by the CGCM output; in the WAM region most of the differences in the projected climate changes came mainly from the empirical correction of SST. |
英文关键词 | Regional climate modelling Dynamical downscaling SST bias correction West African Monsoon Africa CORDEX CRCM5 |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000398926400008 |
WOS关键词 | REGIONAL CLIMATE MODEL ; GENERAL-CIRCULATION MODEL ; GCM BIAS CORRECTIONS ; PRECIPITATION CLIMATOLOGY ; GLOBAL PRECIPITATION ; BOUNDARY-LAYER ; WEST-AFRICA ; PROJECTIONS ; RESOLUTION ; PARAMETERIZATION |
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/36385 |
专题 | 气候变化 |
作者单位 | Univ Quebec, Ctr ESCER Etud Simulat Climat Echelle Reg, Dept Sci Terre & Atmosphere, Succ Ctr Ville,CP 8888, Montreal, PQ H3C 3P8, Canada |
推荐引用方式 GB/T 7714 | Hernandez-Diaz, Leticia,Laprise, Ren,Nikiema, Oumarou,et al. 3-Step dynamical downscaling with empirical correction of sea-surface conditions: application to a CORDEX Africa simulation[J]. CLIMATE DYNAMICS,2017,48. |
APA | Hernandez-Diaz, Leticia,Laprise, Ren,Nikiema, Oumarou,&Winger, Katja.(2017).3-Step dynamical downscaling with empirical correction of sea-surface conditions: application to a CORDEX Africa simulation.CLIMATE DYNAMICS,48. |
MLA | Hernandez-Diaz, Leticia,et al."3-Step dynamical downscaling with empirical correction of sea-surface conditions: application to a CORDEX Africa simulation".CLIMATE DYNAMICS 48(2017). |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论