干旱区生态环境知识资源中心(Arid): Characterizing spatial, diurnal, and seasonal patterns of agricultural irrigation expansion-induced cooling in Northwest China from 2000 to 2020

Arid

DOI	10.1016/j.agrformet.2022.109304
	Characterizing spatial, diurnal, and seasonal patterns of agricultural irrigation expansion-induced cooling in Northwest China from 2000 to 2020
	Zhang, Chao; Ge, Quansheng; Dong, Jinwei; Zhang, Xuezhen; Li, Yan; Han, Songjun
通讯作者	Ge, QS ; Dong, JW
来源期刊	AGRICULTURAL AND FOREST METEOROLOGY
ISSN	0168-1923
EISSN	1873-2240
出版年	2023
卷号	330
英文摘要	In the last two decades, agricultural irrigation areas expanded rapidly in arid Northwest China (NWC, including North and South Xinjiang and Hexi Corridor) and altered local and regional climates. However, the increasing irrigation's climatic effects with underlying biophysical mechanisms have rarely been investigated. Here we characterized the impact patterns of irrigation expansion on land surface temperature (LST) in NWC from spatial, diurnal, and seasonal dimensions from 2000 to 2020; we then decomposed the LST changes related to multiple biophysical components using the energy balance equation and quantified the contributions of albedo and evapotranspiration (ET) to LST changes based on partial correlation and dominance analyses. We found the space-and-time method can better represent the cooling effects of long-term irrigation expansion than the space -for-time method, despite that they derived similar cooling trends. The cooling effects were most evident in South Xinjiang, followed by North Xinjiang and Hexi Corridor, and varied in different irrigation expansion sources. Specifically, more intensive cooling occurred in new irrigated areas from unused lands (-0.69 +/- 0.02 K) than that from grasslands (-0.47 +/- 0.05 K) and forests (-0.28 +/- 0.04 K). The cooling effects were dominated by marked daytime cooling compared to negligible nighttime warming. Seasonally, the cooling effects were concentrated in the growing season (May to September), especially in July and August. LST changes related to latent heat and sensible heat fluxes significantly surpassed other biophysical components. The changes in ET and albedo jointly modulated LST variations and increased ET dominated the daytime cooling effect (r = 0.52, p < 0.001) with a relative importance of over 55%, especially in North Xinjiang. But the ET-dominated cooling would be dampened by enhanced precipitation, implying the non-trivial impact of background climate. This study can provide important references for evaluating the climatic effects caused by irrigation expansion in arid regions and for improving the climate models.
英文关键词	Irrigation expansion Climatic effects Land surface temperature Albedo ET Northwest China
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000964760400001
WOS关键词	LAND-COVER CHANGE ; SURFACE-TEMPERATURE ; BACKGROUND CLIMATE ; IMPACTS ; AFFORESTATION ; MANAGEMENT ; TRENDS ; ALBEDO ; BUDGET ; SCALE
WOS类目	Agronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS研究方向	Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/394997
推荐引用方式 GB/T 7714	Zhang, Chao,Ge, Quansheng,Dong, Jinwei,et al. Characterizing spatial, diurnal, and seasonal patterns of agricultural irrigation expansion-induced cooling in Northwest China from 2000 to 2020[J],2023,330.
APA	Zhang, Chao,Ge, Quansheng,Dong, Jinwei,Zhang, Xuezhen,Li, Yan,&Han, Songjun.(2023).Characterizing spatial, diurnal, and seasonal patterns of agricultural irrigation expansion-induced cooling in Northwest China from 2000 to 2020.AGRICULTURAL AND FOREST METEOROLOGY,330.
MLA	Zhang, Chao,et al."Characterizing spatial, diurnal, and seasonal patterns of agricultural irrigation expansion-induced cooling in Northwest China from 2000 to 2020".AGRICULTURAL AND FOREST METEOROLOGY 330(2023).