Impact of Surface Wind Speed on Atmospheric Visibility and Its Geographic Pattern over China in 1980-2010
Received date: 2012-10-30
Revised date: 2012-12-27
Online published: 2012-12-27
By using the observational data of horizontal atmospheric visibility and wind speed from 576 meteorological stations in Chinese weather monitoring network from 1980 to 2010, this study is focused on the issues including the spatial distributions of wind speed under low atmospheric visibility, the relation between atmospheric visibility and wind speed and the sensitivity of atmospheric visibility changes to wind speed with analyzing its connection to urbanization and the coastal locations. The results indicate that high wind speed corresponds with low atmospheric visibility over the zone with the major deserts in Northern China stretching from Inner Mongolia to eastern Xinjiang, while low wind speed with low atmospheric visibility in the southern and eastern parts of China with the weakest surface wind (<2 m\5s-1) in the Sichuan Basin. Similarly to the geographic "Hu Line", a demarcation line for the relation of surface wind to atmospheric visibility is found from northeastern to southwestern China with a pattern of the negative (positive) relationships between atmospheric visibility and wind speed on the west (east) of the line. On west of the line, the negative relationships persist in the whole year in the major desert regions and the adjacent arid and semi-arid areas in Northern China, reflecting that the deterioration of atmospheric visibility could be resulted from the transportation and emission of dust aerosols driven by strong winds especially in spring; On east of the line, the positive relationships between atmospheric visibility and wind speed are stronger in autumn and winter. In summer the demarcation line is advanced northwards by East Asian summer monsoon, and the connections of atmospheric visibility to wind speed become weaker in Eastern China, implying that the summertime factors influencing atmospheric visibility are more complicated. The sensitivity of atmospheric visibility changes to wind speed is regionally higher in Sichuan Basin, Guizhou and Guangxi as well as the Badain Jaran Desert where the winds play important role in variations of atmospheric visibility. The sensitivity of atmospheric visibility to wind speed in the urban regions is a little higher than in the rural areas with the limited effect of urbanization. Due to the breeze in coastal stations, the sensitivity of atmospheric visibility to wind speed is weaker with the insignificant seasonal variation compared to the inland stations.
CHENG Xu-geng1 , HE Jin-hai1 , CHE Hui-zheng2 , ZHAO Tian-liang3 , ZHENG Xiao-bo4 . Impact of Surface Wind Speed on Atmospheric Visibility and Its Geographic Pattern over China in 1980-2010[J]. Journal of Desert Research, 2013 , 33(6) : 1832 -1839 . DOI: 10.7522/j.issn.1000-694X.2013.00246
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