基于MSWEP降水产品的新疆干旱时空特征分析

doi:10.13866/j.azr.2022.05.06

Abstract

Abstract:

Meteorological stations in Xinjiang are sparse and unevenly distributed, resulting in drought monitoring based on in-situ observations in Xinjiang which are insufficient in spatial representativeness. Remote-sensed precipitation products have the advantages of wide coverage, high spatial resolution, and timeliness compared to data from stations. Thus, remote-sensed precipitation products are important for drought monitoring in Xinjiang with scarce in-situ observations. Multi-Source Weighted-Ensemble Precipitation (MSWEP) has been applied in various applications worldwide. With the foundation of global climate change, Xinjiang has experienced an increasing trend in the frequency of droughts and the variability of precipitation. This paper evaluates the accuracy of the MSWEP products using data from 106 observatories. Based on the Standardized Precipitation Index (SPI), MSWEP was adopted to study the temporal variations in dry/wet conditions, identify drought events, and study drought characteristics in Xinjiang from 1980 to 2021. The main results were as follows: (1) MSWEP was highly correlated with data from in-situ stations (>0.8), which supports its application in drought monitoring. (2) Xinjiang had become more humid in the studied period. (3) Thirteen severe drought events were identified since 1980. Among them, the one from 1985 to 1987 was the most severe, and the one from May-October, 2009, was the most intense. (4) Drought events have various features in duration, intensity, and severity. Some droughts were intense with a short duration, while others were long and more severe. Overall, MSWEP has a high potential for drought monitoring, especially for regions where ground-based observatories are scarce. Based on MSWEP, Xinjiang was found to experience a wetting trend and frequent drought events with different characteristics.

Key words: MSWEP, drought monitoring, drought event, spatiotemporal characteristics, Xinjiang

WANG Jiaoyan. Study on spatiotemporal characteristics of drought in Xinjiang based on Multi-Source Weighted-Ensemble Precipitation multi-source merged precipitation product[J].Arid Zone Research, 2022, 39(5): 1398-1409.

Figures/Tables 9

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SPI值	干湿分类	发生概率/%
>2	极端湿润	2.3
1.5~2	重度湿润	4.4
1~1.5	中度湿润	9.2
0~1	轻微湿润	34.1
-1~0	轻微干旱	34.1
-1.5~-1	中度干旱	9.2
-2~-1.5	重度干旱	4.4
<-2	极端干旱	2.3

典型干旱事件	开始时间 /年-月	结束时间 /年-月	峰值时间 /年-月	持续时间/月	强度	峰值	严重度
	1980-03	1981-06	1980-07	16	0.55	1.76	8.79
典型干旱事件1	1982-11	1987-03	1985-09	53	0.85	2.79	45.08
	1988-08	1989-07	1989-05	12	0.74	2.21	8.88
	1990-10	1991-07	1991-07	10	0.36	1.02	3.64
	1991-09	1992-05	1991-11	9	0.50	2.10	4.53
典型干旱事件2	1995-03	1995-08	1995-06	6	1.09	1.59	6.53
	1996-10	1998-04	1997-11	19	0.92	2.73	17.43
	2001-02	2001-08	2001-05	7	0.56	1.05	3.89
典型干旱事件3	2003-12	2005-04	2004-10	17	0.39	1.01	6.70
	2006-04	2007-06	2006-10	15	0.51	1.35	7.69
	2007-10	2009-01	2008-07	16	0.64	1.60	10.30
典型干旱事件4	2009-05	2009-10	2009-08	6	1.18	2.14	7.09
	2020-06	2021-02	2020-10	9	0.51	1.19	4.63

Study on spatiotemporal characteristics of drought in Xinjiang based on Multi-Source Weighted-Ensemble Precipitation multi-source merged precipitation product

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