Based on the surface observation data and NCEP/NCAR daily reanalysis data, the atmospheric circulation of the two persistent heavy snow processes over Yangtze and Huaihe River Valleys in January 2018 were analyzed, and the impact of synoptic system and low-frequency variation in high and low latitudes (Ural block high and southern branch trough) on persistent heavy snow processes were discussed. Results are shown as follows:(1) The two processes happened with persistent atmospheric circulation anomalies, for example, the polar vortex had a dipole-type distribution, and the blocking high pressure was steady and strong in middle-high latitudes, with cold high pressure over the plain, thus in favor of the southward advance of cold air. In lower latitude, the west Pacific subtropical high and southern branch trough were stable, which is very favorite to transportation of heat and moisture to Yangtze and Huaihe River valleys. Cold air from north and warm-mosit air from south converged to each other and then the favorite environment of heavy snow could appear. (2) The stable and strong Ural block high and the southern branch trough and their interaction played an important role in the two processes. (3) There were differences of the polar vortex、blocking high、southern branch trough、low-level moisture and vertical circulation between the two processes, leading to different features on snow area、intensity and type. (4) Stronger blocking high and deeper southern branch trough benefit the occurrence of persistent heavy snow. The variation between the index of blocking high and southern branch trough was high in those strong snow days, which had important implications for middle and long term forecast on persistent heavy snow. (5) The low-frequency oscillation period of 10~30 days was the most remarkable component of blocking high and southern branch trough and gave a good reference on weather forecast over two weeks.
TONG Jin
,
YE Jinyin
,
WEI Lingxiang
. Analysis on the Atmospheric Circulation and Low-Frequency Oscillation Characteristics of the Two Persistent Heavy Snow Processes over Yangtze and Huaihe River Valleys[J]. Plateau Meteorology, 2019
, 38(4)
: 845
-855
.
DOI: 10.7522/j.issn.1000-0534.2018.00118
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