干旱区生态环境知识资源中心(Arid): Sensitivity of the Land-Atmosphere Coupling to Soil Moisture Anomalies during the Warm Season in China and its Surrounding Areas

Arid

DOI	10.3390/atmos15020221
	Sensitivity of the Land-Atmosphere Coupling to Soil Moisture Anomalies during the Warm Season in China and its Surrounding Areas
	Wang, Lan; Zhang, Shuwen; Yan, Xinyang; He, Chentao
通讯作者	Zhang, SW
来源期刊	ATMOSPHERE
EISSN	2073-4433
出版年	2024
卷号	15 期号:2
英文摘要	Significant temporal and spatial variability in soil moisture (SM) is observed during the warm season in China and its surrounding regions. Because of the existence of two different evapotranspiration regimes, i.e., soil moisture-limited and energy-limited, averaging the land-atmosphere (L-A) coupling strength for all soil wetness scenarios may result in the loss of coupling signals. This study examines the daytime-only L-A interactions under different soil moisture conditions, by using two-legged metrics in the warm season from May to September 1981-2020, partitioning the interactions between SM and latent heat flux (SM-LH, the land leg) from the interactions between latent heat flux and the lifting condensation level (LH-LCL, the atmospheric leg). The statistical results reveal large regional differences in warm-season daytime L-A feedback in China and its surrounding areas. As the soil becomes wetter, the positive SM-LH coupling strength increases in arid regions (e.g., northwest China, Hetao, and the Great Indian Desert) and the positive feedback shifts to the negative one in semi-arid/semi-humid regions (northeast and northern China). The negative LH-LCL coupling is most pronounced in wet soil months in arid regions, while the opposite is true for the Tibetan Plateau. In terms of intraseasonal variation, the large variability of SM in north China, the Tibetan Plateau, and India due to the influence of the summer monsoon leads to the sign change in the land segment coupling index, comparing pre- and post-monsoon periods. To further examine the impact of SM anomalies on L-A coupling and to explore evapotranspiration regimes in the North China Plain, four sets of sensitivity experiments with different soil moisture levels over a period of 10 years were conducted. Under relatively dry soil conditions, evapotranspiration is dominated by the soil moisture-limited regime with positive L-A coupling, regardless of external moisture inflow. The critical soil moisture value separating a soil moisture-limited and an energy-limited regime lies between 0.24 m3/m3 and 0.29 m3/m3. Stronger positive feedback under negative soil moisture anomalies may increase the risk of drought in the North China Plain.
英文关键词	soil moisture daytime-only mean land-atmosphere coupling sensitivity experiment evapotranspiration regime drought
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:001172391200001
WOS关键词	HOT EXTREMES ; PART I ; PRECIPITATION ; DROUGHT ; SUMMER ; CIRCULATION ; FEEDBACKS ; REGIONS
WOS类目	Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/402967
推荐引用方式 GB/T 7714	Wang, Lan,Zhang, Shuwen,Yan, Xinyang,et al. Sensitivity of the Land-Atmosphere Coupling to Soil Moisture Anomalies during the Warm Season in China and its Surrounding Areas[J],2024,15(2).
APA	Wang, Lan,Zhang, Shuwen,Yan, Xinyang,&He, Chentao.(2024).Sensitivity of the Land-Atmosphere Coupling to Soil Moisture Anomalies during the Warm Season in China and its Surrounding Areas.ATMOSPHERE,15(2).
MLA	Wang, Lan,et al."Sensitivity of the Land-Atmosphere Coupling to Soil Moisture Anomalies during the Warm Season in China and its Surrounding Areas".ATMOSPHERE 15.2(2024).