Plateau Meteorology

Plateau Meteorology >

2019 , Vol. 38 >Issue 5: 1017 - 1026

DOI: https://doi.org/10.7522/j.issn.1000-0534.2018.00140

Analysis on the Characteristics and Mechanism of a Rare Ocean-effect Snowstorm in the Western Shandong Peninsula

  • ZHENG Yi ,
  • YANG Chengfang ,
  • GUO Junjian ,
  • ZHANG Lei ,
  • JIAO Yan
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  • Shandong Meteorological Observatory, Ji'nan 250031, Shandong, China;North China Sea Marine Forecast Center of State Oceanic Administration, Qingdao 266061, Shandong, China

Received date: 2018-03-22

  Online published: 2019-10-28

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Abstract

In this study, amount of available observational data were used, including satellites (MODIS and HIMAWARI-8), Doppler radar, profile radar, automatic stations, buoy stations, routine observation data, FNL atmospheric reanalysis data and ERA_Interim reanalysis data. The ocean-effect snowstorm occurring in the western and northern Shandong Peninsula during 25-26, November 2015 was diagnostically analyzed. The results are as follows:(1)In this case, the cold air was strong, the cold vortex was located westward and southward, corresponding to the surface isobaric cyclone bending anomaly, which provided a favorable large-scale background condition for the snowstorm in the western peninsula. (2) There were many snow cloud bands in the snow process, and there may be multiple cloud clusters in each cloud band. The location and development intensity of the cloud belt had a good indication for the snowfall area and amount. (3) Corresponding to the strong snowfall period, the Sea-air temperature difference was around 14℃, there were unstable stratification in the western Shandong Peninsula, the ground convergence line provided the dynamic trigger mechanism, the water vapor accumulated in the early stage and the strong water vapor convergence in the later stage provided sufficient water vapor conditions. The low level convergence area maintaining long time made the snowstorm cloud belts develop strongly and produced "train effect", which was the main cause of the blizzard in the western part of the peninsula. (4) In the course of the blizzard, the western part of the peninsula was superior to the northern part in terms of energy and water vapor, and the dynamic maintenance mechanism was different from the northern part. The convergence of the northwest wind and the northerly wind existed below 900 hPa, which can be used as a reference in the future weather forecast.

Key words： The western Shandong; ocean-effect snowsto; cloud characteristic; dynamical mechanism

Cite this article

ZHENG Yi , YANG Chengfang , GUO Junjian , ZHANG Lei , JIAO Yan . Analysis on the Characteristics and Mechanism of a Rare Ocean-effect Snowstorm in the Western Shandong Peninsula[J]. Plateau Meteorology, 2019 , 38(5) : 1017 -1026 . DOI: 10.7522/j.issn.1000-0534.2018.00140

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