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The response of surface mass and energy balance of a continental glacier to climate variability, western Qilian Mountains, China

机译：中国祁连山西部大陆冰川表面质量和能量平衡对气候变化的响应

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摘要

To understand how a continental glacier responds to climate change, it is imperative to quantify the surface energy fluxes and identify factors controlling glacier mass balance using surface energy balance (SEB) model. Light absorbing impurities (LAIs) at the glacial surface can greatly decrease surface albedo and increase glacial melt. An automatic weather station was set up and generated a unique 6-year meteorological dataset for the ablation zone of Laohugou Glacier No. 12. Based on these data, the surface energy budget was calculated and an experiment on the glacial melt process was carried out. The effect of reduced albedo on glacial melting was analyzed. Owing to continuous accumulation of LAIs, the ablation zone had been darkening since 2010. The mean value of surface albedo in melt period (June through September) dropped from 0.52 to 0.43, and the minimum of daily mean value was as small as 0.1. From the records of 2010-2015, keeping the clean ice albedo fixed in the range of 0.3-0.4, LAIs caused an increase of +7.1 to +16 W m(-2) of net shortwave radiation and an removal of 1101-2663 mm water equivalent. Calculation with the SEB model showed equivalent increases in glacial melt were obtained by increasing air temperature by 1.3 and 3.2 K, respectively.
机译：要了解大陆冰川如何对气候变化做出反应，必须量化表面能通量，并使用表面能平衡（SEB）模型确定控制冰川质量平衡的因素。冰川表面的光吸收杂质（LAIs）可以大大减少表面反照率并增加冰川融化。建立了一个自动气象站，并为老虎沟12号冰川的消融区生成了一个独特的6年气象数据集。基于这些数据，计算了表面能收支，并进行了冰川融化过程的实验。分析了反照率降低对冰川融化的影响。由于LAI的不断积累，自2010年以来消融区开始变暗。融化期（6月至9月）的地表反照率平均值从0.52降至0.43，日平均值的最小值最小为0.1。从2010-2015年的记录来看，将清洁的冰反射率保持在0.3-0.4的范围内，LAI导致净短波辐射增加+7.1至+16 W m（-2），并去除1101-2663 mm水当量。用SEB模型进行的计算表明，通过将空气温度分别提高1.3 K和3.2 K，可得到同等的冰川融化增加。

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  • 来源
    《Climate dynamics》 |2018年第10期|3557-3570|共14页
  • 作者

    Sun Weijun; Qin Xiang; Wang Yetang; Chen Jizu; Du Wentao; Zhang Tong; Huai Baojuan;

  • 作者单位

    Shandong Normal Univ, Coll Geog & Environm, Jinan 250014, Shandong, Peoples R China;

    Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Cryospher Sci, Qilian Shan Stn Glaciol & Ecol Environm, Lanzhou 730000, Peoples R China;

    Shandong Normal Univ, Coll Geog & Environm, Jinan 250014, Shandong, Peoples R China;

    Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Cryospher Sci, Qilian Shan Stn Glaciol & Ecol Environm, Lanzhou 730000, Peoples R China;

    Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Cryospher Sci, Qilian Shan Stn Glaciol & Ecol Environm, Lanzhou 730000, Peoples R China;

    Chinese Acad Meteorol Sci, Inst Climate Syst, Beijing 100081, Peoples R China;

    Shandong Normal Univ, Coll Geog & Environm, Jinan 250014, Shandong, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Surface energy balance; Glacier melt; Light absorbing impurities; Albedo; Radiative forcing;

    机译：表面能平衡;冰川融化;吸光杂质;反照率;辐射强迫;

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