29 August 2005 Applying of helicity in an analysis of a severe sandstorm
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The helicity of a severe sandstorm happened in Northwest China was analyzed by using global reanalysis grid data of NCEP/NCAR for 4 times a day. As an important physical parameter in analyzing and predicting severe convective weather, the helicity also has good indication in the forecasting of sandstorm. The distribution of helicity over the sandstorm area was negative at higher levels and positive at lower levels. There was definite relationship between the evolvement of helicity's negative value at higher levels and the occurrence of sandstorm.
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Jian-hong Tao, Jian-hong Tao, Jin-song Wang, Jin-song Wang, Jian-ying Feng, Jian-ying Feng, Yue Chang, Yue Chang, Xiao-li Liu, Xiao-li Liu, } "Applying of helicity in an analysis of a severe sandstorm", Proc. SPIE 5890, Atmospheric and Environmental Remote Sensing Data Processing and Utilization: Numerical Atmospheric Prediction and Environmental Monitoring, 58901C (29 August 2005); doi: 10.1117/12.614768; https://doi.org/10.1117/12.614768

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