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Dissolved organic carbon in summer precipitation and its wet deposition flux in the Mt. Yulong region, southeastern Tibetan Plateau
Journal of Atmospheric Chemistry ( IF 2 ) Pub Date : 2019-02-20 , DOI: 10.1007/s10874-019-9385-8
Hewen Niu , Shichang Kang , Xiaofei Shi , Guotao Zhang , Shijin Wang , Tao Pu

Dissolved organic carbon (DOC) is an important organic pollutant in the air-water carbon cycle system, potentially influencing the global climate. In this study, 204 rainwater samples from five sampling stations in the Mt. Yulong region were synchronously collected from June to September in 2014. We comprehensively investigated the sources and wet deposition of DOC in summer precipitation. The average concentrations of DOC at five stations ranged from 0.74 to 1.31 mg L−1. The mass absorption efficiency (MAE) of rainwater DOC evaluated at 365 nm was 0.43 ± 0.32 m2 g−1. Backward trajectory analyses indicated that the southwest advection air parcel accounting for 46% of precipitation events, while the corresponding average concentration of rainwater DOC was 1.25 ± 0.56 mg C L−1. In addition to the local or regional contribution, large amount of atmospheric pollutants were transported from South Asia and Southeast Asia to the Mt. Yulong region, both of which had exerted great influence on the regional atmospheric environment. For the first time, the annual wet deposition of DOC in the Mt. Yulong region was estimated and determined to be 1.99 g C m−2 year−1. This is significant because the deposition of DOC on glaciers has great influence on surface albedo of snow and glacier melt. This study can bridge the gap of rainwater DOC research between the Mt. Yulong region and the southeast of Tibetan Plateau (TP), which has significant implications for better understanding the relationship of DOC deposition and glacial shrink in the TP.

中文翻译:

夏季降水中溶解有机碳及其在山中的湿沉降通量。青藏高原东南部玉龙地区

溶解有机碳(DOC)是空气-水碳循环系统中的一种重要有机污染物,可能影响全球气候。在这项研究中,来自山上五个采样站的 204 个雨水样本。2014年6-9月同步采集玉龙地区夏季降水中DOC的来源和湿沉降。五个站点的 DOC 平均浓度范围为 0.74 至 1.31 mg L-1。在 365 nm 处评估的雨水 DOC 的质量吸收效率 (MAE) 为 0.43 ± 0.32 m2 g-1。后向轨迹分析表明,西南平流气团占降水事件的46%,而相应的雨水DOC平均浓度为1.25±0.56 mg CL-1。除了地方或区域的贡献,大量的大气污染物从南亚和东南亚输送到山上。遇龙地区对区域大气环境影响较大。首次在 Mt. 中实现了 DOC 的年度湿沉降。玉龙地区估计并确定为 1.99 g C m-2 year-1。这一点很重要,因为DOC在冰川上的沉积对雪和冰川融化的地表反照率有很大影响。这项研究可以弥补山之间雨水DOC研究的空白。玉龙地区和青藏高原东南部,这对更好地理解青藏高原DOC沉积与冰川收缩的关系具有重要意义。两者都对区域大气环境产生了较大影响。首次在 Mt. 中实现了 DOC 的年度湿沉降。玉龙地区估计并确定为 1.99 g C m-2 year-1。这一点很重要,因为DOC在冰川上的沉积对雪和冰川融化的地表反照率有很大影响。这项研究可以弥补山之间雨水DOC研究的空白。玉龙地区和青藏高原东南部,这对于更好地理解青藏高原DOC沉积与冰川收缩的关系具有重要意义。两者都对区域大气环境产生了较大影响。首次在 Mt. 中实现了 DOC 的年度湿沉降。玉龙地区估计并确定为 1.99 g C m-2 year-1。这一点很重要,因为DOC在冰川上的沉积对雪和冰川融化的地表反照率有很大影响。这项研究可以弥补山之间雨水DOC研究的空白。玉龙地区和青藏高原东南部,这对于更好地理解青藏高原DOC沉积与冰川收缩的关系具有重要意义。这一点很重要,因为DOC在冰川上的沉积对雪和冰川融化的地表反照率有很大影响。这项研究可以弥补山之间雨水DOC研究的空白。玉龙地区和青藏高原东南部,这对于更好地理解青藏高原DOC沉积与冰川收缩的关系具有重要意义。这一点很重要,因为DOC在冰川上的沉积对雪和冰川融化的地表反照率有很大影响。这项研究可以弥补山之间雨水DOC研究的空白。玉龙地区和青藏高原东南部,这对于更好地理解青藏高原DOC沉积与冰川收缩的关系具有重要意义。
更新日期:2019-02-20
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