气候变化及新四季划分方法下的西藏季节变化趋势分析

doi:10.12118/j.issn.1000-6060.2024.437

Abstract

Abstract:

This study analyzes daily temperature data from 38 meteorological stations in Xizang, China, covering the period from 1981 to 2023. A new method for seasonal division in Xizang was employed to categorize the four seasons, and the regional climate changes, temporal shifts in the start dates of each season, and trends in seasonal changes were examined. The results show the following. (1) Areas with four distinct seasons in Xizang are primarily found along the Yarlung Zangbo River and in Nyingchi City, whereas regions with less distinct seasonal variations (including areas without a summer season) are mainly situated in the western and northern parts of Xizang as well as in the high-altitude regions of the Himalayas. (2) In Xizang, the beginning of spring and summer tends to occur earlier, whereas the onset of autumn and winter tends to be delayed. Notably, the start date of spring was significantly earlier in 2000, whereas the onset of autumn and winter was significantly delayed in 2003 and 1995, respectively. (3) Regarding the timing of seasonal starts, the first empirical orthogonal function (EOF1) for spring and autumn exhibited a pattern of “northwest low and southeast high in spring, and middle high and both sides low in autumn”. In spring, the second EOF (EOF2) presented a contrasting distribution pattern of “northwest positive and southeast negative”, whereas in autumn, EOF2 showed an opposite spatial distribution pattern characterized by “southwest positive and northeast negative”. The EOF1 in winter revealed a “high in the north and low in the southwest” pattern, whereas the EOF2 shared similarities with that of spring’s EOF2. (4) Looking ahead, we anticipate that the start dates of spring and summer will be delayed, whereas those for autumn and winter will be advanced.

Key words: start date, wavelet analysis, trend analysis, empirical orthogonal function (EOF), Xizang

SHI Jiqing, LUO Zhen, YIXI Zhuoma, LIU Sai, LI Jihong, DANZENG Yiga, GAN Chenlong. Trend analysis of seasonal changes in Xizang based on climate change and new seasonal division[J].Arid Land Geography, 2025, 48(7): 1141-1152.

Figures/Tables 10

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References 26

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站点	年代
站点	20世纪 80年代	20世纪 90年代	21世纪 00年代	21世纪 10年代	21世纪 20年代
洛隆	0	0	1	4	2
墨竹工卡	0	1	1	3	2
泽当	6	8	6	5	3
昌都	6	5	6	9	3
拉萨	5	7	7	8	3
尼木	1	3	4	4	0
波密	6	5	10	10	3
林芝	3	3	6	7	3
米林	0	1	8	8	3
拉孜	1	2	3	3	2
日喀则	0	1	2	5	3
贡嘎	8	7	8	8	3
加查	7	8	7	10	3
八宿	9	10	10	10	3
察隅	9	10	10	10	3

季节	EOF	方差贡献率/%	累计方差贡献率/%
春季	第一载荷量	30.5	30.5
	第二载荷量	14.5	45.0
	第三载荷量	10.4	55.4
	第四载荷量	7.6	63.0
	第五载荷量	5.9	68.9
秋季	第一载荷量	30.9	30.9
	第二载荷量	11.0	41.9
	第三载荷量	9.7	51.6
	第四载荷量	6.3	57.9
	第五载荷量	4.6	62.4
冬季	第一载荷量	35.6	35.6
	第二载荷量	12.1	47.8
	第三载荷量	10.1	57.9
	第四载荷量	8.1	66.0
	第五载荷量	5.1	71.1

Trend analysis of seasonal changes in Xizang based on climate change and new seasonal division

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