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Remote Sensing Technology and Application  2020, Vol. 35 Issue (6): 1263-1272    DOI: 10.11873/j.issn.1004-0323.2020.6.1263
    
Temporal and Spatial Distribution and Variation Characteristics of Snow Depth in the Northern Hemisphere and Typical Areas
Shanna Yue1,2(),Tao Che1(),Liyun Dai1,Lin Xiao3,Jie Deng1,2
1.Northwest Institute of Eco-environment and Resources,Key Laboratory of Remote Sensing of Gansu Province,Heihe Remote Sensing Experimental Research Station,Chinese Academy of Sciences,Lanzhou 730000,China
2.University of Chinese Academy of Sciences,Beijing 100049,China
3.National Forestry and Grassland Administration Key Laboratory of Forest Resources Conservation and Ecological Safety on the Upper Reaches of the Yangtze River,Sichuan Province Key Laboratory of Ecological Forestry Engineering on the Upper Reaches of the Yangtze River,College of Forestry,Sichuan Agricultural University,Chengdu 611130,China
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Abstract  

The temporal and spatial variation characteristics of snow depth over the Northern Hemisphere and nine typical areas were analyzed based on the GlobSnow snow water equivalent datasets of European Space Agency and the NHSD sow depth datasets of the National Qinghai-Tibet Plateau Scientific Data Center. The results showed that: the Average Annual Snow Depth (AASD) over the Northern Hemisphere generally decreased significantly (p<0.01) during 1988 to 2018, with a change slope of -0.55 cm·(10 a)-1. For high latitudes, the AASD in the northern Canada and Alaska decreased significantly (p<0.01), with a rate of 3.48 cm·(10 a)-1 and 3 cm·(10 a)-1, respectively; and the Average Monthly Snow Depth(AMSD) decreased significantly in winner. The AASD decreased in the West Siberian Plain and Eastern European Plain with a significant change rate of -2.3 cm·(10 a)-1 in the latter (p<0.01), and the AMSD decreased significantly in spring, especially in May. The AASD in the Eastern Siberia showed an increased trend, except in Kamchatka Peninsula, and the AMSD increased significantly in winner. For high mountainous areas, the AASD showed a slow increase rate in the Alps and Rockies, and slight decrease change in the Qinghai-Tibet Plateau (QTP). The AMSD in Alps increased significantly in winner and decreased significantly in May. The variation of snow depth in the Rockies and the QTP presented spatial heterogeneity. During the whole study period, the AMSD decreased in the north of the Rockies and most areas of central region of QTP, while increased in the central and south of Rockies and the mountains on the northern edge of the QTP. The snow depth increased on the north slope of The Himalayas, while decreased on the south slope, with the absolute change rates of less than 0.5 cm·a-1. The AMSD of Nianqing Dangla Mountains which has deep snow showed a significant downward trend in winner. The seasonal variation analysis of snow depth (average snow depth from 2001 to 2010) in 9 typical areas showed that the peak values of snow depth in high mountainous areas are much smaller than those in high latitudes. The snow melting dates in high mountainous areas are obviously earlier than those in high latitudes except for the QTP.

Key words:  Snow depth      Northern Hemisphere      High mountainous area      High latitude      Remote sensing     
Received:  05 July 2020      Published:  26 January 2021
ZTFLH:  TP75  
Corresponding Authors:  Tao Che     E-mail:  ysn@lzb.ac.cn;chetao@lzb.ac.cn
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Shanna Yue
Tao Che
Liyun Dai
Lin Xiao
Jie Deng

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Shanna Yue,Tao Che,Liyun Dai,Lin Xiao,Jie Deng. Temporal and Spatial Distribution and Variation Characteristics of Snow Depth in the Northern Hemisphere and Typical Areas. Remote Sensing Technology and Application, 2020, 35(6): 1263-1272.

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http://www.rsta.ac.cn/EN/10.11873/j.issn.1004-0323.2020.6.1263     OR     http://www.rsta.ac.cn/EN/Y2020/V35/I6/1263

Fig.1  Location of typical areas over the Northern Hemisphere
Fig.2  Flow chart of data processing of GlobSnow and NHSD
Fig.3  Interannual variation of average snow depth over the Northern Hemisphere from 1988/1989 to 2017/2018
Fig.4  Variation slope of annual average snow depth over the Northern Hemisphere
Fig.5  Significant variation slope of annual average snow depth over the Northern Hemisphere
Fig.6  Variation slope of monthly average snow depth over the Northern Hemisphere
Fig.7  Significant variation slope of monthly average snow depth over the Northern Hemisphere
Fig.8  Interannual variation of average snow depth in typical areas
Fig.9  Seasonal variation of snow depth in typical areas
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