Horizontal visibility trends in China 1981-2005
Horizontal visibility trends in China 1981-2005
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DOI：
10.1029/2007gl031450
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发表时间：
2007-12-27
影响因子：
5.2
通讯作者：
Qu, John J.
中科院分区：
文献类型：
--
作者：
Che, Huizheng;Zhang, Xiaoye;Qu, John J.
利用日水平能见度资料，评价了1981 ~ 2005年中国水平能见度、能见度频次和霾度的变化趋势。计算了每个站点和整个中国的年平均值。使用线性回归分析来表征这些变量的长期年度趋势。在过去的25年中，水平能见度显著降低（1990 - 2005年为-2.1 km / 10年），能见度频率显著降低（-3.5% / 10年），但第75百分位年消光系数显著增加（25% / 25年）。根据总能量消耗的快速增长，能见度和雾霾的时空变化一致，支持了气溶胶负荷增加导致华东大部分地区水平能见度下降的推测。
Trends in Chinese horizontal visibility, the frequency of visibility > 19 km, and haziness for the period between 1981 and 2005 were evaluated based on data for daily horizontal visibility. Annual means were calculated for each station and for China as a whole. Linear regression analysis was used to characterize long-term annual trends in these variables. Over the past 25 years, there has been a significant decrease in horizontal visibility (-2.1 km per decade from 1990 to 2005) and the frequency of visibility > 19 km (-3.5% per decade) but a significant increase in the 75th percentile annual extinction coefficients (25% per 25 year). According to rapid increase of total energy consumption, the consistent spatial and temporal variations of visibility and haze support the speculation that increased aerosol loadings were responsible for the observed decreases in horizontal visibility over much of East China.