ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
The Roles of Drycold Air Incursion on Persistent Snowfall in Shandong Peninsula During December of 2005
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Abstract:
In terms of observed data and NCEP reanalyzed data, circulation background and d rycold activity features of the persistent snowfall in Shandong Peninsula duri ng December of 2005 were analyzed. The roles of drycold air in this event were researched by using the moist potential vorticity and frontogenesis theories. T he results suggested that the change of snowfall in Shandong Peninsula could be well reflected by the lowlevel humidity field, while it was closely associated with upperlevel drycold air. The uppertroposphere potential vorticity are a was corresponded with the low relative humidity area. Dry air came mainly from the northern part (high latitude) of uppertroposphere. The down and sou thstretching of potential vorticity area and low humidity area were correspond ed with the lowlevel moist symmetry instability area. The severe snowfall occurred under the common actions of the lifting of topographic and frontogenesis forcin g of lowlevel saturation moist air, as well as the releasing of moist symmetry instability energy. The incursion of drycold air was the trigger mechanism of the releasing of instability energy.
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