科研之友
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摘要
A 20-m Asian dust monitoring tower was installed at Erdene in Dornogobi Mongolia in later 2008 which is one of the high Asian dust source regions in the Asian domain to investigate meteorological conditions for the dust events The tower was equipped with meteorological sensors (temperature humidity and wind speed at four levels precipitation and pressure near the surface) radiation sensors (solar radiation net radiation) and soil measurement sensors (soil moisture and soil temperature at three levels and soil heat flux at one level) and turbulent measurement (sonic anemometer) at the 8 m height and PM10 concentration measurement (beta guage) at the 3 m height Measurement was made for a full year of 2009 The observed data indicated that dust events occur all year round with the maximum hourly mean maximum concentration of 4107 mu g m(-3) in the early May to a minimum of 92 mu g m(-3) in later August It was found that the dust concentration at this site is directly related to the wind speed exceeding the threshold wind speed (likewise the corresponding friction velocity) during the winter to early spring However the observed dust concentration is not only related to the wind speed exceeding the threshold wind speed but also to the Normalized Difference Vegetation Index (NDVI) during the late spring to the late autumn due to the growth of vegetation It was also found that the surface soil moisture content does not affect the dust concentration due to the relatively short residence time of the soil moisture in the surface soil The presently monitored data can be used to
- 出版日期2010-12
