干旱区生态环境知识资源中心(Arid): Wet bias of summer precipitation in the northwestern Tibetan Plateau in ERA5 is linked to overestimated lower-level southerly wind over the plateau

Arid

DOI	10.1007/s00382-023-06672-3
	Wet bias of summer precipitation in the northwestern Tibetan Plateau in ERA5 is linked to overestimated lower-level southerly wind over the plateau
	Ou, Tinghai; Chen, Deliang; Tang, Jianping; Lin, Changgui; Wang, Xuejia; Kukulies, Julia; Lai, Hui-Wen
通讯作者	Chen, DL
来源期刊	CLIMATE DYNAMICS
ISSN	0930-7575
EISSN	1432-0894
出版年	2023
卷号	61 期号:5-6 页码:2139-2153
英文摘要	The Tibetan Plateau (TP), also called the Third Pole, is considered to be the world water tower. The northwestern TP (NWTP), which has an average elevation higher than 4800 m, is an arid region where the summer precipitation is largely overestimated by the ERA5 global reanalysis product. We hypothesize that this wet bias is mainly caused by unrealistic lower-level winds that trigger strong convection over the region; it can be reduced by using a high-resolution regional climate model with a large domain that allows realistically representing interactions between the Westerlies and Asian summer monsoons. Here, downscaling using the Weather Research and Forecasting (WRF) model driven by ERA5 was conducted with a large domain (8 degrees-50 degrees N, 65 degrees-125 degrees E) at 9 km for the period 1979-2019 (WRF9km). Precipitation values from WRF9km and ERA5 were evaluated against satellite observations; compared with ERA5, WRF9km captured the climatological summer precipitation over the NWTP with a much-reduced wet bias. The ERA5 overestimation is mainly caused by excessive convective precipitation, likely linked to strong vertical motions over the NWTP induced by an overestimated lower-level southerly wind.
英文关键词	Tibetan Plateau Summer precipitation ERA5 WRF Wind
类型	Article
语种	英语
开放获取类型	hybrid
收录类别	SCI-E
WOS记录号	WOS:000914370200001
WOS关键词	REANALYSIS DATA ; WESTERLY JET ; CLIMATE ; CLOUDSAT ; CIRCULATION ; REGION ; MODEL ; ASIA
WOS类目	Meteorology & Atmospheric Sciences
WOS研究方向	Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/395777
推荐引用方式 GB/T 7714	Ou, Tinghai,Chen, Deliang,Tang, Jianping,et al. Wet bias of summer precipitation in the northwestern Tibetan Plateau in ERA5 is linked to overestimated lower-level southerly wind over the plateau[J],2023,61(5-6):2139-2153.
APA	Ou, Tinghai.,Chen, Deliang.,Tang, Jianping.,Lin, Changgui.,Wang, Xuejia.,...&Lai, Hui-Wen.(2023).Wet bias of summer precipitation in the northwestern Tibetan Plateau in ERA5 is linked to overestimated lower-level southerly wind over the plateau.CLIMATE DYNAMICS,61(5-6),2139-2153.
MLA	Ou, Tinghai,et al."Wet bias of summer precipitation in the northwestern Tibetan Plateau in ERA5 is linked to overestimated lower-level southerly wind over the plateau".CLIMATE DYNAMICS 61.5-6(2023):2139-2153.