Effects of clouds on surface melting of Laohugou glacier No. 12, western Qilian Mountains, China

被引:23
作者
Chen, Jizu [1 ,2 ]
Qin, Xiang [1 ]
Kang, Shichang [1 ,2 ,3 ]
Du, Wentao [1 ,2 ]
Sun, Weijun [4 ]
Liu, Yushuo [1 ]
机构
[1] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Qilian Shan Stn Glaciol & Ecol Environm, State Key Lab Cryospher Sci, Lanzhou 730000, Gansu, Peoples R China
[2] Univ CAS, Beijing 100049, Peoples R China
[3] CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
[4] Shandong Normal Univ, Coll Populat Resources & Environm, Jinan 250000, Shandong, Peoples R China
基金
中国国家自然科学基金;
关键词
cloud effect; cloud forcing; glacier; longwave-equivalent cloudiness; surface radiation; ENERGY-BALANCE MODEL; GREENLAND ICE-SHEET; MASS-BALANCE; ABLATION ZONE; BREWSTER GLACIER; TIBETAN PLATEAU; NEW-ZEALAND; LONGWAVE RADIATION; SOLAR-RADIATION; SWITZERLAND;
D O I
10.1017/jog.2017.82
中图分类号
P9 [自然地理学];
学科分类号
0705 ; 070501 ;
摘要
We analyzed a 2-year time series of meteorological data (January 2011-December 2012) from three automatic weather stations on Laohugou glacier No. 12, western Qilian Mountains, China. Air temperature, humidity and incoming radiation were significantly correlated between the three sites, while wind speed and direction were not. In this work, we focus on the effects of clouds on other meteorological parameters and on glacier melt. On an average, similar to 18% of top-of-atmosphere short-wave radiation was attenuated by the clear-sky atmosphere, and clouds attenuated a further 12%. Most of the time the monthly average increases in net longwave radiation caused by clouds were larger than decreases in net shortwave radiation but there was a tendency to lose energy during the daytime when melting was most intense. Air temperature and wind speed related to turbulent heat flux were found to suppress glacier melt during cloudy periods, while increased water vapor pressure during cloudy days could enhance glacier melt by reducing energy loss by latent heat. From these results, we have increased the physical understanding of the significance of cloud effects on continental glaciers.
引用
收藏
页码:89 / 99
页数:11
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