Comparative Analysis of Two Precipitation Processes of over 10 mm in Qiqihar in April
This study is based on conventional meteorological data to compare and analyze the blizzard events in Qiqihar from April 11th to 12th,2021 with the sleet weather processes of over 10 mm on April 29th to 30th,2022,in order to reveal the key influencing factors of spring blizzards.Research has found that both of these heavy precipitation weather processes occurred under the influence of high-altitude troughs or cold eddies,as well as surface low pressure.The main precipitation period occurred during the southward movement of cold air and the intersection of two shear lines in the lower atmosphere,with greater precipitation in the area where the shear lines intersect.One side of the cold air mass behind the cold front is an area of heavy precipitation.The water vapor transport channel formed by the low-level southwest jet stream provides sufficient water vapor supply for spring blizzards.The strengthening of water vapor convergence indicates an increase in precipitation.The dew point temperature almost coincides with the layer temperature,indicating that the entire atmosphere is close to saturation and the water vapor is relatively abundant,which is conducive to the generation of heavy precipitation.
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