Identification and evolution characteristics of compound high-temperature and drought events in the Shiyang River Basin

doi:10.11755/j.issn.1006-7639-2024-06-0836

Abstract

Abstract:

Compound high-temperature and drought events is one of the complex extreme climate events with high incidence in the Shiyang River Basin, which has more serious impact on industrial and agricultural production and ecological environment than a single extreme climate event. Based on the average temperature, maximum temperature and precipitation data of five meteorological stations in the Shiyang River Basin from 1961 to 2023, the compound high-temperature and drought events were identified and determined using percentile threshold method and Ped meteorological drought index, and spatial and temporal evolution characteristics of compound high-temperature and drought events were analyzed with linear trend method. The results show that the spatial difference of annual average frequency of compound high-temperature and drought events was small in the Shiyang River Basin, however, the spatial difference of compound high-temperature and drought events frequency was obvious in each decade and increased decade by decade. Annual frequency of compound high-temperature and drought events decreased first and then increased in the Shiyang River Basin, it decreased before 1996 and then increased in the whole basin. Compound high-temperature and drought events mainly occurred from June to August, and the most occurred in July. The frequency of compound high-temperature and drought events with different grades changed greatly, with the increase of drought grade, the frequency of drought increased first and then decreased, the frequency of medium drought was the highest, and the frequency of extreme drought was the least.

Key words: the Shiyang River Basin, compound high-temperature and drought events, meteorological drought index, identification, evolution characteristics

摘要：

复合高温干旱事件是石羊河流域高发的复合极端气候事件之一，对工农业生产和生态环境造成的影响比单一的极端气候事件更为严重。利用1961—2023年石羊河流域5个气象站平均气温、最高气温、降水等资料，采用百分位数阈值法和Ped气象干旱指数识别和确定复合高温干旱事件，采用线性趋势法分析复合高温干旱事件时空演变特征。结果表明：石羊河流域复合高温干旱事件多年平均频次的空间差异较小，但各年代内复合高温干旱事件平均频次空间差异明显，且空间差异有逐年代增大趋势。石羊河流域复合高温干旱事件年频次呈先减少后增多的趋势，全流域及各地均在1996年之前减少，之后增多。复合高温干旱事件主要出现在6—8月，7月最多。石羊河流域不同等级复合高温干旱事件发生频次变化较大，随着干旱等级的升高，干旱频次呈先增加后减少的趋势，中旱频次最多，特旱最少。

关键词: 石羊河流域, 复合高温干旱事件, 气象干旱指数, 识别, 演变特征

CLC Number:

P468.0+26

YANG Xiaoling, SUN Xuying, YANG Jinhu, WU Wen, ZHAO Huihua, CHEN Jing. Identification and evolution characteristics of compound high-temperature and drought events in the Shiyang River Basin[J]. Journal of Arid Meteorology, 2024, 42(6): 836-843.

杨晓玲, 孙旭映, 杨金虎, 吴雯, 赵慧华, 陈静. 石羊河流域复合高温干旱事件的识别及其演变特征[J]. 干旱气象, 2024, 42(6): 836-843.

Figures/Tables 6

Fig.1 Spatial distribution of topography and meteorological stations in the Shiyang River Basin

Fig.2 Spatial distribution of average frequency of compound high-temperature and drought events in the Shiyang River Basin in different decades from 1961 to 2023 （Unit： times）

Fig.3 The inter-annual variation of the occurrence frequency of compound high-temperature and drought events in the Shiyang River Basin during 1961-2023

Tab.1 Climate tendency rate and trend coefficient of annual frequency of compound high-temperature and drought events in the Shiyang River Basin in different periods from 1961 to 2023

时段	气候倾向率/[次·（10 a）^-1]				趋势系数
时段	全流域	上游	中游	下游	全流域	上游	中游	下游
1961—1996年	-0.273	-0.401	-0.265	-0.153	-0.368^**	-0.413^**	-0.337^*	-0.191
1997—2023年	0.327	0.293	0.316	0.372	0.353^*	0.300	0.291	0.334^*
1961—2023年	0.272	0.277	0.252	0.285	0.505^***	0.437^**	0.449^***	0.501^***

Fig.4 The monthly variation of occurrence frequency of compound high-temperature and drought events in different sub-regions of the Shiyang River Basin from May to September during 1961-2023

Tab.2 The occurrence frequency of compound high-temperature and drought events with different grades in the Shiyang River Basin during 1961-2023 单位：次

流域分区	轻旱（0<X<1）	中旱（1≤X<3）	重旱（3≤X<5）	特旱（X≥5）
全流域	15	18	11	6
上游	13	17	10	9
中游	15	19	11	4
下游	17	17	12	6

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