气候变化领域集成服务门户(CCPortal): Impacts of global warming on West African monsoon rainfall: Downscaling by pseudo global warming method

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DOI	10.1016/j.atmosres.2020.105334
	Impacts of global warming on West African monsoon rainfall: Downscaling by pseudo global warming method
	Gbode I.E.; Ogunjobi K.O.; Dudhia J.; Ajayi V.O.; Liu C.
发表日期	2021
ISSN	0169-8095
卷号	249
英文摘要	A set of numerical experiments was conducted in order to investigate the impacts of global warming on West African monsoon rainfall for selected five years. The experiments varied different cumulus, microphysics and planetary boundary layer parameterization schemes. Rainfall characteristics over three climatic zones, Guinea Coast, Savannah and Sahel, was analyzed. The potential change associated with global warming is assessed by the pseudo global warming (PGW) downscaling method. Multiple PGW runs were conducted using climate perturbation from the 40-member ensemble of the Community Earth System Model version 1 (CESM1) coupled with Community Atmospheric Model version 5.2 (CAM5.2) component large ensemble project. The model output was compared with TRMM and GPCP rainfall and atmospheric parameters from ECMWF reanalysis datasets. Results show that the rainfall amount in the 2070s estimated from the PGW runs substantially increases, especially in the eastern Sahel due to enhanced moisture convergence, compared to the current climate. The percentage change in simulated total rainfall amount can increase or decrease by 50% in the PGW runs and the theoretical rainfall computed based on Clausius-Clapeyron relation. Also, found is an increase (decrease) in heavy (both light and moderate) rainfall amount. These results, however, depend on the GCM used as the boundary conditions of the RCM. This suggests that the 4 o C change in average surface temperature derived from the 40-member ensemble model strongly influenced the increased rainfall simulated by the PGW experiments. Thus, highlighting the advantage of using the PGW technique to estimate the likely difference between present and future climate with reduced large-scale model biases and computational resources. © 2020 Elsevier B.V.
英文关键词	Community earth system model; Guinea Coast; Pseudo global warming; Rainfall; Sahel; Savannah; Temperature; Weather Research and Forecasting model
语种	英语
scopus关键词	Atmospheric thermodynamics; Boundary layers; Global warming; Rain; Rain gages; Atmospheric parameters; Clausius Clapeyron relation; Community atmospheric model; Computational resources; Parameterization schemes; Planetary boundary layers; Pseudo-global warming methods; Rainfall characteristics; Climate models; air temperature; downscaling; ensemble forecasting; global warming; monsoon; rainfall; savanna; TRMM; weather forecasting; Guinea; Sahel [Sub-Saharan Africa]
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/162069
作者单位	West African Science Service Center on Climate Change and Adapted Land Use (WASCAL), Federal University of Technology AkureOndo State, Nigeria; WASCAL Competence Center, Avenue Mouammar Kadhafi, Ouagadougou, Burkina Faso; Mesoscale and Microscale Meteorology Laboratory, National Center for Atmospheric Research, Boulder, CO, United States; Department of Meteorology and Climate Science, Federal University of Technology AkureOndo State, Nigeria; Research Applications Laboratory, National Center for Atmospheric Research, Boulder, CO, United States
推荐引用方式 GB/T 7714	Gbode I.E.,Ogunjobi K.O.,Dudhia J.,et al. Impacts of global warming on West African monsoon rainfall: Downscaling by pseudo global warming method[J],2021,249.
APA	Gbode I.E.,Ogunjobi K.O.,Dudhia J.,Ajayi V.O.,&Liu C..(2021).Impacts of global warming on West African monsoon rainfall: Downscaling by pseudo global warming method.Atmospheric Research,249.
MLA	Gbode I.E.,et al."Impacts of global warming on West African monsoon rainfall: Downscaling by pseudo global warming method".Atmospheric Research 249(2021).