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      氣候變化研究進(jìn)展 ?? 2010, Vol. 6 ?? Issue (03): 175-180.

      ? 氣候系統變化 ? 上一篇    下一篇

      碳質(zhì)氣溶膠在藏東南冰芯中的記錄

      王茉,徐柏青,鄔光劍,楊威   

      1. 中國科學(xué)院青藏高原研究所
      • 收稿日期:2009-09-14 修回日期:2009-12-29 出版日期:2010-05-30 發(fā)布日期:2010-05-30
      • 通訊作者: 徐柏青

      Carbonaceous Aerosols Recorded in Ice Core in Southeastern Tibetan Plateau

      • Received:2009-09-14 Revised:2009-12-29 Online:2010-05-30 Published:2010-05-30

      摘要: 在青藏高原東南部帕隆藏布源頭海洋性冰川區,對冰川編目的4號冰川(PLZ-4)實(shí)施冰芯鉆取,獲得總長(cháng)度為29 m的冰芯。對冰芯中元素碳(EC)、不溶性有機碳(WIOC)和可溶性離子(Cl-,NO3-,SO42-,Na+,K+,Mg2+,Ca2+)的含量進(jìn)行實(shí)驗分析,結果顯示:1998-2005年上述組分在該冰芯中的含量均呈現持續增長(cháng)的趨勢;冰芯中EC含量及EC/WIOC比值表現出非季風(fēng)季節高、季風(fēng)季節低的顯著(zhù)特征,揭示了該地區冰川中記錄的碳質(zhì)氣溶膠濃度與南亞棕色云之間的密切聯(lián)系。同時(shí)指出,在季風(fēng)前的4-5月,沉降于雪冰中平均含量>10 ng/g的EC所引起的雪冰表面反照率降低以及冰川消融等氣候環(huán)境效應不容忽視。

      關(guān)鍵詞: 青藏高原, 冰芯, 南亞大氣棕色云, 元素碳

      Abstract: The concentrations of carbonaceous aerosols and soluble ions (Cl-, NO3-, SO42-, Na+, K+, Mg2+, Ca2+) 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.

      Key words: Tibetan Plateau, ice core, South Asian brown cloud, elemental carbon

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