2000—2019年新疆积雪终日时空变化特征

doi:10.12118/j.issn.1000-6060.2021.440

摘要/Abstract

摘要：

基于Google Earth Engine（GEE）遥感云平台,利用2000—2019年MODIS积雪产品资料提取和计算新疆积雪终日信息,利用趋势分析,变异系数等方法分析了新疆积雪终日时空变化特征和变化趋势。结果表明：（1）新疆积雪终日以天山为界,天山以北长于南部,山区为积雪终日的高值区,盆地为积雪终日的低值区。北疆准噶尔盆地和伊犁河谷积雪终日在75~114 d之间,南疆塔里木盆地在0~31 d之间属于低值区。阿尔泰山脉、天山山脉和昆仑山脉区域在224~365 d之间属于高值区。（2）南疆和北疆积雪终日有明显的时空差异,2000—2019年北疆准噶尔盆地和高海拔山脉地区积雪终日有明显的推迟趋势,推迟幅度达到14 d,占新疆总面积的8%。南疆塔里木盆地和东疆区域有明显的提前趋势,提前幅度达到16 d约占新疆总面积的44%。塔里木盆地和准噶尔盆地具有相反的变化趋势。（3）新疆积雪终日年际变化差异显著,天山中段和北疆积雪终日出现不稳定状况,天山中段2002—2009年总体上呈现“M”型的特点,即多年积雪消融日年均值中出现明显的波峰和波谷,北疆2009—2019年积雪终日有较大的年际变化呈现出不稳定状况,出现明显的波峰和波谷,年际变化较大。

关键词: GEE云计算, 积雪终日, 时空分布, 变化趋势

Abstract:

In this study, based on Google Earth Engine (GEE) remote sensing cloud platform, using MODIS snow product from 2000 to 2019, the diurnal snow cover cessation day information in Xinjiang, China is extracted and calculated, and the diurnal spatial and temporal variation characteristics and variation trend of snow cover cessation day in Xinjiang are analyzed by using trend analysis, coefficient of variation methods. The results show the following: (1) with the Tianshan Mountains as the dividing line, and the snow cover cessation day of the north of the Tianshan Mountains is longer than that of the south. The mountainous area is the high-value area of snow cover cessation day, and the basin is the low value area of snow cover cessation day. The snow cover cessation day in the Junggar Basin and Ili River Valley in northern Xinjiang lasts 75-114 d all year long. The Tarim Basin in southern Xinjiang is a low-value area between 0 and 31 d. The Altai Mountains, Tianshan Mountains and Kunlun Mountains belong to high value areas between 224 and 365 days. (2) There are obvious spatio-temporal differences in snow cover cessation days in southern Xinjiang and northern Xinjiang. From 2000 to 2019, the snow cover cessation day in the Junggar Basin and the high-altitude mountains in northern Xinjiang has an obvious trend of delaying, with a delay of 14 days, accounting for 8% of the total area of Xinjiang. The Tarim Basin and the areas across eastern Xinjiang showed an obvious advance advancing trend, the advance advancing rate reached 16 d, accounting for 44% of the total area of Xinjiang. Tarim Basin and Junggar Basin have opposite trend. (3) The snow cover cessation day of Xinjiang varied all year, and central Tianshan Mountains and northern Xinjiang showed instability in changes of snow cover cessation day all year long. The snow cover cessation day of central Tianshan Mountains showed overall “M”characteristics shape curve, with the annual average snow melting days showing obvious peaks and troughs during 2002—2009. Moreover, northern Xinjiang showed large interannual changes with instability during 2009—2019 and with obvious peaks and troughs as well as large interannual variability.

Key words: GEE cloud computing, snow cover cessation day, temporal and spatial distribution, change trend

买合木提江·维吉旦,玉素甫江·如素力,仇忠丽. 2000—2019年新疆积雪终日时空变化特征[J]. 干旱区地理, 2022, 45(4): 1061-1070.

Maihemutijiang WEIJIDAN,Yusufujiang RUSULI,QIU Zhongli. Temporal and spatial changes of the snow cover cessation day from 2000 to 2019 in Xinjiang, China[J]. Arid Land Geography, 2022, 45(4): 1061-1070.

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类型	波动程度	C_v取值范围	像元数	面积比列/%
	轻微波动	0.037<C_v≤1.038	2909778	33.57
积雪终日	中度波动	1.038<C_v≤2.320	3493170	40.31
	显著波动	2.320<C_v≤4.514	2263823	26.12