Haze episodes at Syowa Station, coastal Antarctica: Where did they come from?
Haze episodes at Syowa Station, coastal Antarctica: Where did they come from?
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DOI：
10.1029/2009jd012582
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发表时间：
2010-07
影响因子：
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通讯作者：
K. Hara;K. Osada;M. Yabuki;G. Hashida;T. Yamanouchi;M. Hayashi;M. Shiobara;C. Nishita;M. Wada
中科院分区：
文献类型：
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作者：
K. Hara;K. Osada;M. Yabuki;G. Hashida;T. Yamanouchi;M. Hayashi;M. Shiobara;C. Nishita;M. Wada
[1]2004-2007年在南极昭和站进行气溶胶观测期间，在冬季和春季低风和无飘雪雾的条件下观测到了一些低能见度（霾）现象。在“南极霾”现象期间，昭和站的气溶胶粒子数浓度和黑碳浓度相对于背景条件增加1 ~ 2个数量级，而地面O3浓度则同时下降，特别是在极地日出之后。化学分析表明，烟霞现象中的主要气溶胶成分是海盐（例如，Na +，Cl-）。轨迹分析和海军气溶胶分析和预测系统模型表明，南美洲和南部非洲生物质燃烧产生的羽流被输送到南极海岸的Syowa站，这是因为南大洋的气旋向东（偶尔向西）靠近，随后向极流动。这种来自中纬度羽流的向极流动和输送过程中海盐粒子的注入可能会在昭和站产生南极霾现象。春季（极地日出后）大气中0 - 3浓度的差异大于冬季。在烟霾事件中海盐颗粒的增强可以在提供活性卤素物质的额外来源方面发挥重要作用。
[1] During our aerosol measurement program at Syowa Station, Antarctica, in 2004-2007, some low-visibility (haze) phenomena were observed during winter―spring under conditions with low winds and without drifting snow and fog. During "Antarctic haze" phenomena, the number concentration of aerosol particles and black carbon concentration increased by 1 to 2 orders higher relative to background conditions at Syowa Station, whereas surface O 3 concentration dropped simultaneously, especially after polar sunrise. Chemical analysis showed that major aerosol constituents in the haze phenomena were sea salt (e.g., Na + , Cl ― ). Trajectory analysis and the Navy Aerosol Analysis and Prediction System model showed that plumes from biomass burning in South America and southern Africa were transported to Syowa Station, on the Antarctic coast, because of the eastward (occasionally westward) approach of cyclones in the Southern Ocean and subsequent poleward flow. This poleward flow from midlatitudes of the plume and injection of sea-salt particles during the transport might engender Antarctic haze phenomena at Syowa Station. Differences of 0 3 concentration between the background and the haze conditions tended to be larger in spring (after polar sunrise) than in winter. Enhancement of sea-salt particles in the haze events can serve important roles in providing additional sources of reactive halogen species.