摘要
在青藏高原东南部帕隆藏布源头海洋性冰川区,对冰川编目的4号冰川(PLZ-4)实施冰芯钻取,获得总长度为29m的冰芯。对冰芯中元素碳(EC)、不溶性有机碳(WIOC)和可溶性离子(Cl-,NO3-,SO42-,Na+,K+,Mg2+,Ca2+)的含量进行实验分析,结果显示:1998—2005年上述组分在该冰芯中的含量均呈现持续增长的趋势;冰芯中EC含量及EC/WIOC比值表现出非季风季节高、季风季节低的显著特征,揭示了该地区冰川中记录的碳质气溶胶浓度与南亚棕色云之间的密切联系。同时指出,在季风前的4—5月,沉降于雪冰中平均含量>10ng/g的EC所引起的雪冰表面反照率降低以及冰川消融等气候环境效应不容忽视。
The concentrations of carbonaceous aerosols and soluble ions（Cl^-,NO3^-,SO4^2-,Na^＋,K^＋,Mg^2＋,Ca^2＋） in the 29-meter-long PLZ-4 ice core,retrieved from a maritime glacier on the southeastern Tibetan Plateau,were analyzed by a Thermal/Optical Carbon Analyzer and ion chromatographs,respectively.The results show that elemental carbon（EC）,water insoluble organic carbon（WIOC） and soluble ions concentrations in this ice core were increasing dramatically during 1998-2005.Meanwhile,EC concentrations and EC/WIOC ratios showed significant seasonal variations;high concentrations and ratios occurred in non-monsoon seasons and low concentrations and ratios in monsoon seasons,indicating that the carbonaceous aerosols recorded in the southeastern Tibetan glacier were highly related with South Asian brown clouds.Besides,the average EC concentration of 10 ng/g in pre-monsoon,especially from April to May,could provoke the decreased snow/firn albedo and glacier melting,which can not be ignored.
出处
《气候变化研究进展》
CSCD
2010年第3期175-180,共6页
Climate Change Research
基金
国家重点基础研究发展计划项目(2009CB723901)
中国科学院知识创新工程方向项目(KZCX2-YW-146)
关键词
青藏高原
冰芯
南亚棕色云
元素碳
Tibetan Plateau
ice core
South Asian brown cloud
elemental carbon
