Causal Analysis of an Unusual Winter Heavy Fog in 2006
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Abstract:
With the intensive observation data and NCEP/NCAR reanalyzed data, an unusual heavy fog process occurred over the eastcentral China from 25 to 27 December in 2006 is analyzed in aspects of the largescale synoptic condition and dynamic and thermodynamic mechanisms. It was shown that the fog occurred while the nearground wind velocity varied from 0.3 to 2.9 m/s and the dense fog occurred while the wind velocity varied from 0.3 to 2.4 m/s and the visibility was within 15 meters when velocity was from 0.8 to 1.1 m/s. Although vapor condition was bad and rainfall didn’t occur within a few days before the heavy fog, the continuous vapor transportation of the southwestern air current before a trough offered plentiful vapor for the fog. The results also show that the stable stratification gradually established before the fog.At first, the instable stratification built at higher levels after sunrise, subsequently passed downward to lower levels, and then the inversion layer destroyed and the fog dispersed and cleared off. The results indicate that the visibility changed rapidly and violently before the first stage of the severe heavy fog but it did not before the second stage.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.