干旱区生态环境知识资源中心(Arid): Observed heatwave changes in arid northwest China: Physical mechanism and long-term trend

Arid

DOI	10.1016/j.atmosres.2020.105009
	Observed heatwave changes in arid northwest China: Physical mechanism and long-term trend
	Luo, Ming; Ning, Guicai; Xu, Feng; Wang, Shigong; Liu, Zhen; Yang, Yuanjian
通讯作者	Ning, GC
来源期刊	ATMOSPHERIC RESEARCH
ISSN	0169-8095
EISSN	1873-2895
出版年	2020
卷号	242
英文摘要	Arid regions suffer seriously from frequent and severe heatwaves. As compared to other regions, however, the synoptic-scale characteristics and mechanism of heatwave events in arid region are less understood and warrant in-depth investigations. Using observational and reanalysis datasets, here we investigate the heatwave behaviors in arid northwest China (ANC) during 1961-2014. Results reveal that heatwaves in ANC are accompanied by a hot and dry air column. In particular, the main synoptic systems are characterized by a warm-core low pressure in the lower troposphere and a deep warm high pressure in the middle and upper troposphere over the ANC and nearby regions, resulting in the heatwaves there. In the lower troposphere, the prevailing southerly flow induced by the warm-core low pressure increases the near-surface air temperature via warm advection. In the middle and upper troposphere, the deep warm high pressure is accompanied by sinking motion over the ANC surrounding region, leading to clear-sky conditions and less precipitation. These pressure configurations facilitate temperature increases by radiative heating and subsidence warming. Notably, the deep warm high pressure is closely associated with the evolution and eastward movement of a wave-like pattern over the northern midlatitudes. Over the long-term period, the heatwave in ANC exhibits significant intensifying trends in terms of increasing frequency (0.40 events decade(-1)), prolonging duration (1.67 days decade(-1)), and strengthening amplitude (0.32 degrees C decade(-1)). Also, we find that heatwaves in ANC tend to commence earlier and end later during recent decades. These findings provide scientific evidence from the synoptic and climatic perspectives for understanding the formation mechanism and forecasting of the heatwaves in arid regions.
英文关键词	Heatwave Arid northwest China Synoptic behaviors Warm-core low pressure Deep warm high pressure Long-term trend
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000535422200018
WOS关键词	TARIM RIVER-BASIN ; TEMPERATURE EXTREMES ; ATMOSPHERIC CONTROLS ; WAVES ; SUMMER ; EUROPE ; BLOCKING ; DROUGHT ; WEATHER ; REGION
WOS类目	Meteorology & Atmospheric Sciences
WOS研究方向	Meteorology & Atmospheric Sciences
来源机构	南京信息工程大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/324531
作者单位	[Luo, Ming; Xu, Feng] Sun Yat Sen Univ, Sch Geog & Planning, Guangdong Key Lab Urbanizat & Geosimulat, Guangzhou 510275, Peoples R China; [Luo, Ming; Ning, Guicai] Chinese Univ Hong Kong, Inst Environm Energy & Sustainabil, Sha Tin, Hong Kong, Peoples R China; [Wang, Shigong] Chengdu Univ Informat Technol, Sch Atmospher Sci, Sichuan Key Lab Plateau Atmosphere & Environm, Chengdu 610225, Peoples R China; [Liu, Zhen] Univ Edinburgh, Sch Geosci, Edinburgh, Midlothian, Scotland; [Yang, Yuanjian] Nanjing Univ Informat Sci & Technol, Sch Atmospher Phys, Nanjing, Peoples R China
推荐引用方式 GB/T 7714	Luo, Ming,Ning, Guicai,Xu, Feng,et al. Observed heatwave changes in arid northwest China: Physical mechanism and long-term trend[J]. 南京信息工程大学,2020,242.
APA	Luo, Ming,Ning, Guicai,Xu, Feng,Wang, Shigong,Liu, Zhen,&Yang, Yuanjian.(2020).Observed heatwave changes in arid northwest China: Physical mechanism and long-term trend.ATMOSPHERIC RESEARCH,242.
MLA	Luo, Ming,et al."Observed heatwave changes in arid northwest China: Physical mechanism and long-term trend".ATMOSPHERIC RESEARCH 242(2020).