The atmospheric circulation patterns influencing the frequency
of spring sand-dust storms in the Tarim Basin |
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| Authors: | HongJun Li XinHua Yang Yong Zhao MinZhong Wang and Wen Huo |
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| Institution: | Urumqi Institute of Desert Meteorology, China Meteorological Administration, Urumqi, Xinjiang 830002, China;Urumqi Institute of Desert Meteorology, China Meteorological Administration, Urumqi, Xinjiang 830002, China;Urumqi Institute of Desert Meteorology, China Meteorological Administration, Urumqi, Xinjiang 830002, China;Urumqi Institute of Desert Meteorology, China Meteorological Administration, Urumqi, Xinjiang 830002, China;Urumqi Institute of Desert Meteorology, China Meteorological Administration, Urumqi, Xinjiang 830002, China |
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| Abstract: | Using NCEP/NCAR reanalysis data and the sand-storm frequency data from 37 weather stations in the Tarim Basin for the period
1961-2009, the relationship between the frequency of spring sandstorms in the Tarim Basin and the associated atmospheric circulation
patterns is analyzed in this study. We found significantly negative correlations between sandstorm frequency and the
500-hPa geopotential height over the Paris Basin and midwestern Mongolia, while there were positive correlations over the Ural
River region. The rising of the 500-hPa geopotential height in midwestern Mongolia and its falling over the Ural region correspond
to a weakening of the large-scale wave patterns in the Eurasian region, which directly causes the frequency of the sand-dust
storms in the Tarim Basin to decline. Also, the abrupt decline in the spring sandstorm frequency in the Tarim Basin observed in the
last half-century is associated with profound changes in the atmospheric circulation in these key regions. At the interannual scale,
the strengthened cyclonic atmospheric circulation patterns in the western part of Mongolia and the anticyclonic patterns over the
East European plains at 500-hPa geopotential height, are responsible for frequent sandstorm occurrences in the Tarim Basin. |
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| Keywords: | Tarim Basin frequency of sand-dust storm atmospheric circulation |
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