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Features of visibility variation at Great Wall Station, Antarctica

【标题】Features of visibility variation at Great Wall Station, Antarctica

【Title】Features of visibility variation at Great Wall Station, Antarctica

【DOI】10.3724/SP.J.1085.2013.00188

【作者】 YU Lejiang; ZHANG Benzheng& 杨清华; 魏立新; 孟上

【Author】 MENG Shang ; Yang Qinghua ; Wei Lixin ; Meng Shang

【期刊】极地研究

【Journal】ADVANCES IN POLAR SCIENCE

【期刊年份】2013

【卷】24

【期】3

【关键词】 Great Wall Station; Antarctica; visibility; sea fog; blowing snow

【Keywords】 Great Wall Station; Antarctica; visibility; sea fog; blowing snow

【摘要】 The variation of visibility at Great Wall Station (GWS) was analyzed using manual observational data for the period of 1986 to 2012. Results show that the frequencies of occurrence of high (≥10 km) and low visibility (0―1 km) are 61.0% and 8.0%, respectively. Visibility at GWS shows an evident seasonal variation: The highest visibility between November and March, and the lowest visibility from June to October. Sea fog and precipitation are the main factors for low visibility during summer, whereas frequent adverse weather, such as falling snow, blowing snow, or blizzards, are responsible for low visibility in winter. The frequency of occurrence of low visibility has decreased significantly from 1986 to 2012. Conversely, the frequency of occurrence of high visibility has shown a significant increasing trend, especially during winter. The decreasing tendencies of fog, blowing snow, and snowfall have contributed to the increasing trend of high visibility during winter. Visibility at GWS exhibits significant synoptic-scale (2.1 to 8.3 d), annual, and inter-annual periods (2 a, 4.1 a, and 6.9 a to 8.2 a), among which the most significant period is 4.1 a. The visibility observed during 2012 indicates that instrumental observation can be applied in the continuous monitoring of visibility at GWS.

【Abstract】 The variation of visibility at Great Wall Station (GWS) was analyzed using manual observational data for the period of 1986 to 2012. Results show that the frequencies of occurrence of high (≥10 km) and low visibility (0―1 km) are 61.0% and 8.0%, respectively. Visibility at GWS shows an evident seasonal variation: The highest visibility between November and March, and the lowest visibility from June to October. Sea fog and precipitation are the main factors for low visibility during summer, whereas frequent adverse weather, such as falling snow, blowing snow, or blizzards, are responsible for low visibility in winter. The frequency of occurrence of low visibility has decreased significantly from 1986 to 2012. Conversely, the frequency of occurrence of high visibility has shown a significant increasing trend, especially during winter. The decreasing tendencies of fog, blowing snow, and snowfall have contributed to the increasing trend of high visibility during winter. Visibility at GWS exhibits significant synoptic-scale (2.1 to 8.3 d), annual, and inter-annual periods (2 a, 4.1 a, and 6.9 a to 8.2 a), among which the most significant period is 4.1 a. The visibility observed during 2012 indicates that instrumental observation can be applied in the continuous monitoring of visibility at GWS.

【基金/项目】 南极普里兹湾海冰反照率观测和参数化研究 ; 南极下降风观测与数值模拟研究 ; 厄尔尼诺和热带印度洋偶极子对南极季节内振荡的影响机制研究 ; 南极地区环境遥感考察 ; 南极周边海域物理海洋和海洋气象考察

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