ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Comparative Analysis of Snowfall Events at Lhasa Airport Based on Circulation Tpyes Classification
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Abstract:
This study employs a modified Jenkinson-Collison (J-C) circulation type classification method to classifyand diagnose 56 snowfall events that occurred during 2013—2020. The results are as followed. The improved method achieves a classification success rate of 92.9%, identifying cyclonic type (12.5%), low-pressure trough type (42.9%), and westerly advection type (37.5%), with only 7.1% of events remaining unclassified—significantly lower than that from the traditional method. The three circulation types exhibit distinct characteristics. The cyclonic type, corresponding to plateau vortices, features the strongest dynamic and moisture conditions, with the largest mean snowfall (3.4 mm) and longest duration (358 min). The low-pressure trough type, influenced by the southern branch trough, shows the most unstable atmospheric conditions but relatively weak dynamics and moisture, resulting in the lowest mean snowfall (1.2 mm) and shortest duration (170 min). The westerly advection type, dominated by warm ridges and upper-level jets, has the most stable atmospheric conditions, with a “low-level convergence–upper-level divergence” moisture structure, and intermediate snowfall characteristics (mean 1.8 mm; duration 280 min).
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