1981—2024年西藏地区平均风速及其资源时空变化

doi:10.13866/j.azr.2025.09.01

Abstract

Abstract:

Understanding the characteristics of near-surface wind speed (Ws) is crucial in investigating dust storms, evapotranspiration, air pollution, and wind energy development. Based on the daily mean Ws at 38 meteorological stations in Xizang from 1981 to 2024 as well as the indices of monthly atmospheric circulation and sea surface temperatures, we analyzed temporal and spatial changes in the mean Ws and its influencing factors. For this analysis, we used statistical methods, namely, Pearson's correlation coefficient, Pettitt mutation test, linear tendency estimation, and stepwise regression. The results show that: (1) The annual and seasonal average Ws and the number of days with Ws ≥3 m·s^-1 decreased significantly at most of the stations in Xizang, and the Ws decreased faster in northwest Xizang than in other directions. The number of days with Ws ≥3 m·s^-1 decreased more in spring than in other seasons, and the number of stations with this Ws increased the most in winter among all the seasons. (2) In the past 44 years, the annual Ws and the number of days with Ws ≥3 m·s^-1 decreased in Tibet at a rate of 0.08 m·s^-1·(10a)^-1 and 13.5 d·(10a)^-1, respectively, mainly in spring. (3) In the 1980s, the annual and seasonal Ws in Xizang were relatively higher than in the rest of the study period, specifically in spring. In the 1990s, the Ws was high in spring and standard in the other three seasons with a typical annual outlook. In the 21st century, the seasonal and annual Ws were standard. The number of days with Ws ≥3 m·s^-1 were more in the 1980s and 1990s and less in the 2000s and 2010s. (4) In the past 44 years, the sudden larger to smaller shifts in the annual and seasonal Ws and the number of days with Ws ≥3 m·s^-1 occurred in the early 1990s and mid to late 1990s, respectively. The Ws showed a turning point from decreasing to increasing around 2010. (5) Except winters, the significant decreases in annual and seasonal Ws in Xizang were caused by global warming.

Key words: average wind speed, change trend, interdecadal change, climate mutation, atmospheric circulation index, sea surface temperature index, Xizang

DU Jun, Tsewang , HUANG Zhicheng, Dechendolkar . Spatio-temporal change in mean wind speed and its resources in Xizang from 1981 to 2024[J].Arid Zone Research, 2025, 42(9): 1549-1562.

Figures/Tables 10

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要素	时间	1980s （1981— 1990年）	1990s （1991—2000年）	2000s （2001— 2010年）	2010s （2011—2020年）
平均风速/（m·s^-1）	春季	0.7	0.2	-0.1	0.0
	夏季	0.5	0.0	-0.1	0.1
	秋季	0.4	0.0	-0.1	0.1
	冬季	0.5	0.0	0.0	0.1
	年	0.5	0.0	-0.1	0.1
Ws_≥3 日数/d	春季	15.5	7.8	-2.6	-3.7
	夏季	11.7	3.8	-1.1	-1.7
	秋季	9.4	3.4	-1.6	-0.5
	冬季	9.4	3.0	-0.8	-0.9
	年	44.2	14.8	-9.2	-5.6

	春季	夏季	秋季	冬季	年
经度	-0.59^***	-0.57^***	-0.51^**	-0.50^**	-0.55^***
纬度	-0.01	-0.08	-0.06	0.01	-0.03
海拔高度	0.64^***	0.44^**	0.52^**	0.59^***	0.57^***

Spatio-temporal change in mean wind speed and its resources in Xizang from 1981 to 2024

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