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- W2352802379 abstract "Based on the observations of dust concentration and micro-meteorological factors in the surface layer that were obtained from a duststorm station located in the Horqin sand land area in Inner Mongolia during the springs of 2008 and 2009,the variations in dust concentration and friction velocity during various dust events were investigated,and the evolution in downward short-wave radiation and net radiation for different dust weathers were analyzed.Distinguishing local and non-local dust emission by using the dust concentration observations at two levels avoided an underestimation on dust emission thresholds.The results showed that the values of friction velocity u* and dust concentration were both low before dust emission,and u* rapidly increased,while the values of dust concentration maintained small during the pre-emission stage.Then dust concentration quickly increased as u* was high during the dust emission stage,and dust concentration decreased nearly linearly with the decreasing u* at the decay stage.The threshold friction velocity u*t and threshold velocity ut in the Horqin sand land area were estimated to be 0.62 and 9.5 m·s-1,respectively.The thresholds slightly increased from blowing dust,dust storm to severe dust storm.In comparison with clear days,downward short-wave radiation and net radiation obviously decreased." @default.
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- W2352802379 date "2012-02-27" @default.
- W2352802379 modified "2023-09-25" @default.
- W2352802379 title "Study on the Threshold Friction Velocity of Dust Emission in Horqin Sand Land Area in the Inner Mongolia" @default.
- W2352802379 hasPublicationYear "2012" @default.
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