气候变化领域集成服务门户(CCPortal): Characteristics and determining factors of spring-summer consecutive drought variations in Northwest China

CCPortal

DOI	10.1016/j.atmosres.2024.107361
	Characteristics and determining factors of spring-summer consecutive drought variations in Northwest China
	Ge, Jing; Feng, Dongpu; Liu, Huaru; Li, Wangcheng; Zhu, Yongning
发表日期	2024
ISSN	0169-8095
EISSN	1873-2895
起始页码	304
卷号	304
英文摘要	Northwest China (NWC, defined by its administrative division) is an arid and semi-arid region where continuous drought occurs in spring and summer that severely affects crop growth and yields. However, the characteristics of spring-summer consecutive drought (SSCD) in NWC remain unknown. Based on daily observation data from 118 stations in NWC for the period 1961-2017, we investigated the variations in SSCD, as defined by the standardized precipitation evapotranspiration index (SPEI), and their determining factors. The SSCD intensity in NWC underwent a two-stage change rather than a sustained non-significant decrease during 1961-2017. Specifically, this intensity significantly decreased before 1993 (-0.19 decade(-1); p < 0.05) and increased thereafter (0.21 decade(-1); p < 0.05). The variations in SSCD in NWC were primarily determined by the variations in potential evapotranspiration (ET0)(.) The decrease and increase in ET0 (-19.52 mm decade(-1) and 10.77 mm decade(-1), respectively; p < 0.05) dominated those of SSCD in NWC during 1961-1993 and 1994-2017, respectively, with respective explanatory variances of 99.6% and 93.2%. Furthermore, the decrease in wind speed (-0.14 m s(-1) decade(-1); p < 0.05) dominated that in ET0 before 1993, whereas the decrease in relative humidity (-1.47% decade(-1); p < 0.05) and the weak recovery of wind speed (-0.06 m s(-1) decade(-1); p < 0.05) jointly dominated the increase in ET0 after 1993. Along with the increased SSCD after 1993, significant changes also occurred in the atmospheric circulation. An intensified anticyclonic anomaly occurred to the west of NWC, which provided a favorable circulation background for the increase in SSCD in NWC after the early 1990s. These findings provide a basis for further understanding drought and sustainable agricultural development in NWC under climate change.
英文关键词	Northwest China; Spring-summer consecutive drought; Standardized precipitation evapotranspiration; index; Potential evapotranspiration
语种	英语
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
WOS记录号	WOS:001223807100001
来源期刊	ATMOSPHERIC RESEARCH
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/290300
作者单位	Ningxia University; Ningxia University
推荐引用方式 GB/T 7714	Ge, Jing,Feng, Dongpu,Liu, Huaru,et al. Characteristics and determining factors of spring-summer consecutive drought variations in Northwest China[J],2024,304.
APA	Ge, Jing,Feng, Dongpu,Liu, Huaru,Li, Wangcheng,&Zhu, Yongning.(2024).Characteristics and determining factors of spring-summer consecutive drought variations in Northwest China.ATMOSPHERIC RESEARCH,304.
MLA	Ge, Jing,et al."Characteristics and determining factors of spring-summer consecutive drought variations in Northwest China".ATMOSPHERIC RESEARCH 304(2024).