Investigation of the spatio-temporal heterogeneity and optical property of water-soluble organic carbon in atmospheric aerosol and snow over the Yulong Snow Mountain, southeastern Tibetan Plateau.
Investigation of the spatio-temporal heterogeneity and optical property of water-soluble organic carbon in atmospheric aerosol and snow over the Yulong Snow Mountain, southeastern Tibetan Plateau.
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DOI：
10.1016/j.envint.2020.106045
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发表时间：
2020-09
影响因子：
11.8
通讯作者：
H. Niu;Shi-chang Kang;W. Gao;C. Sarangi;Lekhendra Tripathee;D. Rupakheti;Guotao Zhang;Xingguo Yan
中科院分区：
文献类型：
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作者：
H. Niu;Shi-chang Kang;W. Gao;C. Sarangi;Lekhendra Tripathee;D. Rupakheti;Guotao Zhang;Xingguo Yan
大气气溶胶是近几十年来活跃研究的一个分支。高海拔冰川上吸光物质的沉积对冰冻圈环境、冰冻圈水文和气候系统造成重大不利影响。尽管青藏高原冰川雪/冰中水溶性有机碳(WSOC)的浓度已有报道，但其在夏季降水-大气-雪-河水连续体背景下的传输过程和光学特性却很少研究。在这项研究中，我们系统地研究了与玉龙山地区各种形式的样品中WSOC浓度和WSOC光吸收特性相关的一些科学问题。统计结果表明，白水冰川积雪中WSOC的空间分布是不均匀的。随着时间的延长，每个雪坑的平均WSOC浓度显着降低，其吸光性能显着升高。气溶胶WSOC浓度和光吸收具有明显的空间差异和季节变化。季风前和季风期间的 WSOC 含量分别最高和最低。而吸光特性呈现出对比鲜明的季节趋势。与其他形式的水体相比，由冰川融水提供径流的河流的 WSOC 浓度明显较低（例如 0.42 ± 0.03 mg L−1）。多个雪和融水样本中 WSOC (MAC-WSOC) 的质量吸收截面存在显着差异且与类型相关。四种样本中大气气溶胶的 MAC-WSOC 值最低，这可能与私家车和旅游巴士的尾气排放有关。统计结果表明，各种冰雪样品的AAE330-400平均值近似相等。冰川雪为在高海拔地区经历长距离迁移的气态物质的沉积提供了理想的平台。活跃火点的分布表明，生物质燃烧排放对研究区域的 WSOC 沉积做出了巨大贡献。然而，这项初步研究代表了对青藏高原东南部 WSOC 沉积的首次系统调查。为了提高我们对 WSOC 传输过程和光学特性的理解，迫切需要进一步进行强有力的现场现场调查和实验室测量。
Atmospheric aerosols are a branch of active research in recent decades. The deposition of light-absorbing substances on high-altitude glaciers causes substantial adverse impacts on the cryospheric environment, cryosphere-hydrology, and climate system. Although, the concentrations of water-soluble organic carbon (WSOC) in snow/ice on glaciers of Tibetan Plateau (TP) have been reported, their transfer processes and optical properties in the context of summer precipitation-atmosphere-snow-river water continuum are seldom studied. In this study, we have systematically examined some scientific issues associated with WSOC concentrations and light absorption properties of WSOC in various forms of samples from the Mt. Yulong region. Statistical results demonstrate that the spatial distribution of WSOC in the snow of Baishui glacier was heterogeneous. The average WSOC concentrations of each snowpit were significantly decreased, and its light-absorbing properties were significantly elevated with the time extension. Aerosol WSOC concentrations and light absorption have distinct spatial disparity and seasonal variation. Pre-monsoon and monsoon have the highest and lowest WSOC content, respectively. Whereas the light-absorbing properties present contrasting seasonal trends. Rivers of which runoff was supplied by glacier meltwater have significantly lower WSOC concentrations (e.g., 0.42 ± 0.03 mg L−1) compared with other forms of water bodies. Mass absorption cross-section of WSOC (MAC-WSOC) in multiple snow and meltwater samples was significantly different and type-dependent. Atmospheric aerosol has the lowest MAC-WSOCvalue among the four types of samples, which was likely associated with exhaust emissions from private vehicles and tour buses. Statistical results indicated that the average AAE330-400values of various snow/ice samples are subequal. Snow of glaciers supplies a desirable platform for the deposition of gaseous materials which experienced long-range transport in high altitude zones. Biomass-burning emissions made an immense contribution to the WSOC deposition over the study area, as demonstrated by the distribution of active fire points. However, this preliminary study represents the first systematic investigation of WSOC deposition in southeastern TP. Further robust in-situ field investigations and laboratory measurements are urgently necessary to improve our understanding of the transfer process and optical property of WSOC.