Observed changes of cryosphere in China over the second half of the 20th century: an overview

被引:34
作者
Cunde, Xiao
Shiyin, Liu
Lin, Zhao [1 ]
Wu, Qingbai
Li, Peiji
Liu, Chunzhen
Zhang, Qiwen
Ding, Yongjian
Yao, Tandong
Li, Zhongqin
Pu, Jiancheng
机构
[1] Chinese Acad Sci, State Key Lab Cryospher Sci Cold & Arid Reg Envir, Lanzhou 730000, Peoples R China
[2] Chinese Acad Sci, Inst Engn Res, Lanzhou 730000, Peoples R China
来源
ANNALS OF GLACIOLOGY, VOL 46, 2007 | 2007年 / 46卷
关键词
D O I
10.3189/172756407782871396
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
During approximately the past five decades, changes in snow cover, mountain glaciers, frozen ground (including permafrost), sea ice and river ice have been observed in China. However, most data were published in Chinese and thus unknown to the international communities. Here we review these published results to show an overview of cryospheric changes in China for the last similar to 50years. Long-term variability of snow cover over the Qinghai-Xizang (Tibetan) Plateau (QXP) is characterized by large interannual variability superimposed on a continuously increasing trend. Glacier changes in western China vary remarkably in different regions. Although in most mountains the glaciers display a retreating trend (similar to 80%) or have even vanished, some glaciers (similar to 20%) are still advancing. Frozen ground (including permafrost) has experienced a rapid decay since the 1980s, and these changes are occurring both in the QXP and in the cold regions of north China. Sea-ice areas in the Bohai and north Yellow Seas have been shrinking since the 1970s. Interannual variations possibly relate to the solar cyles, and sea-ice extent extremes relate to El Nino-Southern Oscillation (ENSO) events. The freeze-up and break-up dates of river ice in north China in the 1990s are, on average, 1-6 days later and 1-3 days earlier, respectively, than the 1950s-1990 mean. Frozen duration and the maximum thickness of river ice are, respectively, 4-10 days shorter and 0.06-0.21 cm thinner in the 1990s than the average.
引用
收藏
页码:382 / 390
页数:9
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