气候变化领域集成服务门户(CCPortal): The driving processes of concurrent hot and dry extreme events in China

CCPortal

DOI	10.1175/JCLI-D-19-0760.1
	The driving processes of concurrent hot and dry extreme events in China
	Tian F.; Klingaman N.P.; Dong B.
发表日期	2021
ISSN	08948755
起始页码	1809
结束页码	1824
卷号	34 期号:5
英文摘要	Subseasonal heatwave-driven concurrent hot and dry extreme events (HDEs) can cause substantial damage to crops, and hence to lives and livelihoods. However, the physical processes that lead to these devastating events are not well understood. Based on observations and reanalysis data for 1979-2016 over China, we show that HDEs occur preferentially over central and eastern China (CEC) and southern China (SC), with a maximum of three events per year along the Yangtze Valley. The probability of longer-lived and potentially more damaging HDEs is larger in SC than in CEC. Over SC the key factors of HDEs-positive anomalies of surface air temperature and evapotranspiration, and negative anomalies of soil moisture-begin two pentads before maximizing at the peak of the HDEs. These anomalies occur south of a positive height anomaly at 200 hPa, associated with a large-scale subsidence anomaly. The processes over CEC are similar to those for SC, but the anomalies begin one pentad before the peak. HDE frequency is strongly related to the Silk Road pattern and the boreal summer intraseasonal oscillation. Positive phases of the Silk Road pattern and suppressed phases of the boreal summer intraseasonal oscillation are associated with positive height anomalies over CEC and SC, increasing HDE frequency by about 35%-54% relative to the climatological mean. Understanding the effects of subseasonal and seasonal atmospheric circulation variability, such as the Silk Road pattern and boreal summer intraseasonal oscillation, on HDEs is important to improve HDE predictions over China. © 2021 American Meteorological Society. All rights reserved.
英文关键词	Atmosphere-land interaction; Drought; Madden-Julian oscillation; Monsoons; Rossby waves; Surface temperature
语种	英语
scopus关键词	Roads and streets; Soil moisture; Tropical engineering; Atmospheric circulation variability; Boreal summer intraseasonal oscillation; Eastern China; Extreme events; Height anomaly; Physical process; Southern China; Surface air temperatures; Silk; agricultural application; boundary layer; climate effect; climate modeling; climatology; drought; evapotranspiration; heat wave; land-atmosphere interaction; livelihood; Madden-Julian oscillation; monsoon; Rossby wave; soil moisture; surface temperature; weather forecasting; China; Yangtze Valley
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/178697
作者单位	National Centre for Atmospheric Science, Department of Meteorology, University of Reading, Reading, United Kingdom
推荐引用方式 GB/T 7714	Tian F.,Klingaman N.P.,Dong B.. The driving processes of concurrent hot and dry extreme events in China[J],2021,34(5).
APA	Tian F.,Klingaman N.P.,&Dong B..(2021).The driving processes of concurrent hot and dry extreme events in China.Journal of Climate,34(5).
MLA	Tian F.,et al."The driving processes of concurrent hot and dry extreme events in China".Journal of Climate 34.5(2021).