河西走廊东部春季复合低温多雨事件的识别及其变化特征

doi:10.12118/j.issn.1000-6060.2025.416

Abstract

Abstract:

Compound low-temperature and rainfall (CTLR) events are among the complex, high-incidence climate extremes occurring in the eastern Hexi Corridor. They are important climate indicators and meteorological disasters that cause more severe damage to agricultural production and the ecological environment than single extreme climate events. Based on daily minimum temperature and precipitation data from five meteorological stations (spring of 1960—2024) in the eastern Hexi Corridor, CTLR events were identified and characterized via the percentile threshold method and the principle of maximum proximity. Spatiotemporal characteristics of CTLR events were subsequently analyzed using the inverse distance weighting interpolation and linear trend methods. The results show the following: (1) Springtime and March-May CTLR events in the region assumed distribution characteristics of more in the south, less in the north, ranked by frequency as Gulang>Tianzhu>Liangzhou> Yongchang>Minqin. High-frequency areas were clustered in the Gulang shallow mountainous area, whereas the Minqin desert area served as the low-frequency area. (2) Spring, as well as March and April CTLR events showed decadal and annual decreases, whereas May showed a nonmonotonic trend, increasing first before decreasing. Peak CTLR frequency years (spring and monthly) varied across regional and local scales, and CTLR absences were recorded in individual years. This provides an important scientific basis and practical reference for agricultural production and ecological security.

Key words: identification, change characteristics, compound low temperature and rainfall events, percentile threshold method, Hexi Corridor

YANG Xiaoling, ZHAO Huihua, SHI Zhengrong, ZHOU Hua, DING Wenkui, CHEN Jing. Identification and change characteristics of compound low temperature and rainfall events of spring in the eastern Hexi Corridor[J].Arid Land Geography, 2026, 49(6): 1147-1156.

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References 39

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地名	低温总阈值/℃			降水总阈值/mm
地名	3月	4月	5月	3月	4月	5月
永昌	-11.6	-4.9	0.6	0.7	1.4	2.9
民勤	-9.9	-2.8	4.3	0.2	0.4	1.3
凉州	-7.6	-1.7	4.2	0.6	1.0	2.3
古浪	-9.9	-3.4	1.9	2.1	3.8	6.2
天祝	-15.2	-9.7	-4.0	1.3	2.5	5.3

时段	地名	1960—1969年	1970—1979年	1980—1989年	1990—1999年	2000—2009年	2010—2019年	2020—2024年
春季	全区域	0.0	0.6	0.7	0.1	-0.3	-0.1	-1.5
	永昌	-0.1	0.4	0.8	0.2	-0.5	0.0	-1.1
	民勤	0.3	0.6	0.4	-0.6	-0.2	0.1	-1.4
	凉州	-0.4	0.7	1.2	0.2	-0.4	-0.2	-1.7
	古浪	0.2	0.8	1.0	0.4	-0.9	-0.3	-2.7
	天祝	0.0	0.3	-0.2	0.4	0.2	-0.3	-0.8
3月	全区域	0.4	0.0	0.5	-0.2	-0.1	-0.2	-0.6
	永昌	0.4	-0.5	0.8	0.0	-0.3	-0.3	-0.7
	民勤	0.5	0.0	-0.1	-0.3	0.0	0.2	-0.4
	凉州	0.2	-0.1	0.9	-0.3	-0.2	-0.1	-0.5
	古浪	0.7	0.6	0.4	-0.3	-0.3	-0.7	-1.2
	天祝	0.0	-0.2	0.3	0.0	0.3	-0.2	-0.4
4月	全区域	0.2	0.4	-0.2	0.1	-0.2	-0.1	-0.4
	永昌	-0.2	0.5	-0.1	0.0	-0.2	0.1	0.0
	民勤	0.1	0.6	0.1	-0.2	-0.2	-0.1	-0.3
	凉州	0.1	0.5	-0.4	0.4	-0.4	-0.2	-0.6
	古浪	0.2	0.3	0.1	0.1	-0.2	-0.1	-0.8
	天祝	0.7	0.1	-0.5	0.3	-0.2	-0.4	-0.3
5月	全区域	-0.6	0.2	0.3	0.2	0.0	0.2	-0.5
	永昌	-0.4	0.3	0.0	0.1	-0.1	0.1	-0.5
	民勤	-0.2	0.1	0.5	0.0	0.1	0.1	-0.6
	凉州	-0.8	0.2	0.6	0.0	0.1	0.0	-0.7
	古浪	-0.7	-0.1	0.5	0.6	-0.4	0.5	-0.7
	天祝	-0.7	0.4	0.0	0.1	0.1	0.3	-0.1

项目		全区域	永昌	民勤	凉州	古浪	天祝
春季	倾向率/次·(10a)^-1	-0.205	-0.133	-0.195	-0.194	-0.393	-0.109
春季	趋势系数	-0.293	-0.151	-0.261	-0.214	-0.332^*	-0.116
3月	倾向率/次·(10a)^-1	-0.121	-0.119	-0.057	-0.097	-0.299	-0.032
3月	趋势系数	-0.307^*	-0.202	-0.149	-0.188	-0.433^***	-0.069
4月	倾向率/次·(10a)^-1	-0.101	-0.007	-0.100	-0.114	-0.132	-0.151
4月	趋势系数	-0.291	-0.014	-0.267	-0.266	-0.242	-0.257
5月	倾向率/次·(10a)^-1	0.017	-0.007	-0.038	0.010	0.038	0.074
5月	趋势系数	0.045	-0.017	-0.083	0.034	0.058	0.137

地名	春季		3月		4月		5月
地名	频次/次	年份	频次/次	年份	频次/次	年份	频次/次	年份
全区域	6	1979、2010	3	1962、1979	3	1975	3	1992
永昌	8	1989	5	1982	3	1975、1989、2010	3	1977、1992、2016
民勤	5	1975、1979、1982、2010	3	1969、1979	3	1975	4	1961
凉州	8	1979	3	1962、1969、1979、1985、1989、2010	3	1963、1979	4	1980
古浪	9	1979	6	1962	3	1963、1979、1990、1996、2003、2010	5	1992
天祝	7	1992	4	2007	5	1960	5	1992

Identification and change characteristics of compound low temperature and rainfall events of spring in the eastern Hexi Corridor

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