近60 a柴达木盆地沙尘天气时空变化特征及其影响因子

doi:10.13866/j.azr.2021.04.15

Abstract

Abstract:

This study analyzes the spatial-temporal variation in sand-dust weather and its influencing factors in Qaidam Basin. Meteorological data on blowing sands, floating dusts, sandstorms, temperature, precipitation, and relative humidity were analyzed for 58 years from nine representative stations in Qaidam Basin using the Mann-Kendall test, wavelet analysis, and other statistical methods. According to the results, the number of days of blowing sands, floating dusts, and sandstorms in the region over the past 58 years has dropped significantly, with the number of days with sand-dust weather being highest in the 1970s and lowest in the 2000s. The number of days of sand-blowing changed abruptly in 1997 and showed a downward trend after the sudden change. The number of sandstorm days had a long period of 10-15 years and a short period of 5-7 years, the number of blowing sand days also had a long period of 10-15 year, and the number of floating dust days had no evident periodicity. There was more sand-dust weather in the southwest of the basin and less in the northeast of the basin. The number of days of blowing sands, floating dusts, and sandstorms were positively correlated with air pressure, gale days, and area and intensity of polar eddies in Asia, and they were negatively correlated with temperature and area and intensity of subtropical highs in the Western Pacific, Tibetan Plateau, Indo-Burma Trough, and Indian Ocean warm pool.

Key words: days of blowing sands, days of floating dusts, days of sandstorm, spatial-temporal variations, Qaidam Basin

CHEN Jing,GUO Xiaoning,BAI Wenjuan,WEN Xia,YANG Yanhua. Spatiotemporal characteristics and influencing factors of dust weather in Qaidam Basin in recent 60 years[J].Arid Zone Research, 2021, 38(4): 1040-1047.

Figures/Tables 9

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References 25

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类别	气压/hPa	气温/℃	降水/mm	相对湿度/％	大风日数/d	总云量/％
扬沙日数	0.267^*	-0.398^*	0.035	-0.139	0.693^*	0.23
浮尘日数	0.378^*	-0.591^*	-0.127	-0.131	0.61^*	0.399^*
沙尘暴日数	0.425 ^*	-0.515^*	0.016	-0.261	0.643^*	0.162

类别	西太平洋副热带高压		亚洲区极涡		西藏高原	印缅槽	印度洋暖池
类别	面积	强度	面积	强度	指数	指数	面积	强度
扬沙日数	-0.36^**	-0.58^**	0.45^**	0.53^**	-0.35^**	-0.32^*	-0.59^**	-0.55^**
浮尘日数	-0.51^**	-0.74^**	0.56^**	0.55^**	-0.51^**	-0.55^**	-0.64^**	-0.61^**
沙尘暴日数	-0.47^**	-0.66^**	0.60^**	0.58^**	-0.38^**	-0.47^**	-0.51^**	-0.51^**

Spatiotemporal characteristics and influencing factors of dust weather in Qaidam Basin in recent 60 years

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类别	1961—1970年代	1971—1980年代	1981—1990年代	1991—2000年代	2001—2010年代
扬沙	4	11	6	-1	-6
浮尘	14	17	6	-2	-4
沙尘暴	2	2	1	0	-1