气候变化领域集成服务门户(CCPortal): Evaluation of convection-permitting WRF CONUS simulation on the relationship between soil moisture and heatwaves

CCPortal

DOI	10.1007/s00382-018-4508-5
	Evaluation of convection-permitting WRF CONUS simulation on the relationship between soil moisture and heatwaves
	Zhang Z.; Li Y.; Chen F.; Barlage M.; Li Z.
发表日期	2020
ISSN	0930-7575
起始页码	235
结束页码	252
卷号	55
英文摘要	Soil moisture plays an important role in modulating regional climate from sub-seasonal to seasonal timescales. Particularly important, soil moisture deficits can amplify summer heatwaves (HWs) through soil moisture-temperature feedback which has critical impacts on society, economy and human health. In this study, we evaluate decade-long convection-permitting Weather Research and Forecast (WRF) model simulations over the contiguous US on simulating heatwaves and their relationship with antecedent soil moisture using a dense observational network. We showed that the WRF model is capable of capturing the spatial patten of temperature threshold to define HWs, though the simulation shows a warm bias in the Midwest and cold bias in western mountainous regions. Two HW indices, based on frequency (HWF) and magnitude (HWM), are evaluated. Significant anti-correlations between antecedent soil moisture and both HW indices have been found in most parts of the domain except the South Pacific Coast. A detailed study has been conducted for the Midwest and South Great Plains regions, where two heatwaves had occurred in the last decade. In both regions, the high quantile of the HWF distribution shows a strong dependence on antecedent soil moisture: drier soil leads to much larger increase on the upper quantile of HWF than it does on the lower quantile. Soil moisture effects on the higher end of HWM are not as strong as on the lower end: wetter antecedent soil corresponds to a larger decrease on the lower quantile of HWM. WRF captures the heterogeneous responses to dry soil on HWF distribution in both regions, but overestimates these HWM responses in the Midwest and underestimates them in the South Great Plains. Our results show confidence in WRF’s ability to simulate HW characteristics and the impacts of antecedent soil moisture on HWs. These are also important implications for using high-resolution convection-permitting mode to study the coupling between land and atmosphere. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Heatwave; Land–atmosphere interaction; Regional climate; Soil moisture; Soil moisture-temperature feedback; WRF
语种	英语
scopus关键词	air temperature; atmospheric convection; atmospheric modeling; computer simulation; heat wave; mountain region; soil moisture; weather forecasting; Midwest; United States
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/145416
作者单位	Global Institute for Water Security, University of Saskatchewan, Saskatoon, SK, Canada; National Center for Atmospheric Research, Boulder, CO, United States
推荐引用方式 GB/T 7714	Zhang Z.,Li Y.,Chen F.,et al. Evaluation of convection-permitting WRF CONUS simulation on the relationship between soil moisture and heatwaves[J],2020,55.
APA	Zhang Z.,Li Y.,Chen F.,Barlage M.,&Li Z..(2020).Evaluation of convection-permitting WRF CONUS simulation on the relationship between soil moisture and heatwaves.Climate Dynamics,55.
MLA	Zhang Z.,et al."Evaluation of convection-permitting WRF CONUS simulation on the relationship between soil moisture and heatwaves".Climate Dynamics 55(2020).