摘要
通过对2013年春季在青藏高原昆仑山求勉雷克塔格冰川上取得的冰川表面温度资料的分析,研究了该冰川表面温度空间变化特征及其影响因素.结果表明:该冰川表面(粒雪)温度在晴天时较多云或阴雪天时偏低,这可能与晴天时冰川表面吸收的部分热量用于粒雪消融而不是粒雪层升温有关;晴天时该冰川表面温度随海拔的升高而降低,其递减率值为0.58℃·(100m)-1,较自由大气的气温递减率值略偏低;晴天时,冰川表层粒雪层厚度对其表面温度具有重要的影响,二者之间呈显著的正相关关系,并且粒雪层厚度每增加10cm,其冰川表面温度会升高约0.46℃.结合青藏高原其他冰川表面温度的观测结果,揭示出当冰川表面存在消融时其表面温度日变化幅度较小,一般只有几度.
Based on the measured surface temperature data on the Qiumianleiketage Glacier in the Kunlun Mountains, Tibetan Plateau, in the spring of 2013, it was found that： 1） the glacier surface （covered by firn） temperature was lower in the clear day than in the cloudy or overcast day, which might be caused by that some parts of energy absorbed by the glacier surface were consumed for the firn surface melting rather than for the firn surface temperature increasing in the clear day;2） the glacier surface temperature decreased with increasing altitude with a lapse rate of 0.58 ℃·（100m）-1 in the clear day, which is slightly lower than the local free-air lapse rate;3） the depth of firn on the glacier surface could exert an important influence on the surface temperature in the clear day, and there was a significant positive relationship between them, which showed that the firn surface temperature increased by 0.46 ℃ while the depth of firn increased by 10 cm. By comprehensive analysis of the surface temperature data from the glaciers over the Tibetan Plateau, it was revealed that the diurnal amplitude of glacier surface temperature was small, only about several degrees, under the condition that the melting occurred on the glacier surface.
出处
《冰川冻土》
CSCD
北大核心
2013年第5期1088-1094,共7页
Journal of Glaciology and Geocryology
基金
全球变化研究国家重大科学研究计划项目(2010CB951404)
中国科学院战略性先导科技专项(XDB03030204)
国家自然科学基金项目(40930526
41190084)资助
