1979-2014年东北地区雪深时空变化与大气环流的关系

doi:10.7522/j.issn.1000-0240.2018.0098

摘要/Abstract

摘要： 基于被动微波遥感反演的雪深数据集（1979-2014年），利用Mann-Kendall检验、R/S分析、相关分析和小波分析等方法研究了东北地区雪深时空变化特征及其与大气环流的关系。结果表明：1979-2014年，东北地区年均雪深总体呈减小趋势，减小速率为-0.084 cm·（10a）^-1。其中，春季雪深减小速率最大，为-0.19 cm·（10a）^-1（P<0.05），其次是冬季[-0.17 cm·（10a）^-1]，而秋季雪深减小速率最小，仅为-0.05 cm·（10a）^-1。空间上，平原区（东北平原和三江平原）与少部分高原区（呼伦贝尔高原西南部）年均雪深呈增大趋势，山地（大、小兴安岭和长白山）与高原大部（内蒙古高原）雪深呈减小趋势，而且雪深增大区域的面积和变化速率均小于雪深减小的地区。东北地区年均雪深变化的Hurst指数为0.85，表明雪深未来减小的持续性很强；同时雪深变化具有22 a的主周期。春秋季雪深变化与东亚槽强度及北半球极涡面积呈显著负相关性，而冬季雪深与北半球副高强度关系密切。

关键词: 积雪深度, 时空变化, 东北地区, 大气环流

Abstract: The relationship between spatial and temporal variation of snow cover depth and atmospheric circulation have been studied, based on the snow cover depth dataset from passive microwave remote sensing (1979-2014), by using M-K inspection, R/S analysis and wavelet analysis. The results show that the annual mean snow cover depth in Northeast China had decreased from 1979 to 2014 with a rate of -0.084 cm· (10a)^-1. Among them, the averaged decreasing rate of snow cover depth in spring was the maximum, -0.19 cm· (10a)^-1 (P<0.05), followed by that in winter, -0.17 cm· (10a)^-1, and then that in autumn, only -0.05 cm· (10a)^-1. Spatially, in the plains (Northeast China Plain and Sanjiang Plain) and the southwest Hulun Buir Plateau the annual mean snow cover depth had increased. However, in the mountains (the Greater Khingan, Lesser Khingan Ranges and Changbai Mountains) and most of the Inner Mongolia Plateau, the snow cover depth had reduced. The Hurst index of annual mean snow cover depth in Northeast China was 0.85, indicating that there had been a strong persistence in the reduction of snow cover depth; besides, the snow cover depth variation had a primary period of 22 years. The East Asia Trough intensity and polar vortex area in Northern Hemisphere had negatively correlated with the snow cover depth variation in spring and autumn significantly, and the snow cover depth in winter had strong related to the Northern Hemisphere Sub High intensity.

Key words: snow cover depth, spatial and temporal variation, Northeast China, atmospheric circulation

中图分类号:

P426.63+5

路倩, 李宝富, 王志慧, 孙佳瑶, 仝天. 1979-2014年东北地区雪深时空变化与大气环流的关系[J]. 冰川冻土, 2018, 40(5): 907-915.

LU Qian, LI Baofu, WANG Zhihui, SUN Jiayao, TONG Tian. The relationship between spatial and temporal change of snow cover depth and atmospheric circulation in Northeast China from 1979 to 2014[J]. Journal of Glaciology and Geocryology, 2018, 40(5): 907-915.

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