欧亚持续性阻塞对6月大兴安岭地区气温和降水的影响及气温的前兆信号研究

doi:10.3969/j.issn.1673-503X.2021.04.009

Abstract

Abstract:

Based on a newly developed international discrimination method for identifying continuous closed blocking and open high ridge events, the frequency of 500 hPa persistent high-value events (PMZs) in different regions of Eurasia and its influence on summer temperature and precipitation in the Greater Khingan Mountains were discussed. The results show that the PMZ events in the region of Eurasia from 105°-125° E are closely related to the summer temperature in the Greater Khingan Mountains, especially in June. When PMZ events occur frequently in the 105°-125° E region, the subsidence warming caused by the abnormally high pressure from Lake Baikal to Northeast China and the clear sky radiation results in the high air temperature in the Greater Khingan Mountains region. Meanwhile, the relative humidity in the lower troposphere of this region is poor, combined with the abnormal anticyclonic circulation system in the middle and lower troposphere and the subsidence movement. It is not conducive to significant precipitation in the Greater Khingan Mountains region. In addition, the geopotential height in the Mesopotential Basin of Central Asia in May can be used as a pre-forecast index of the temperature in the Greater Khingan Mountains in June. When the geopotential height field in the Mesopotential Basin of Central Asia in May is high (low), the geopotential height in the east of Lake Baikal in June is high (low), corresponding to the temperature in the Greater Khingan Mountains in the same period is high (low).

Key words: Closed blocking, Occurrence frequency, Open high-pressure ridge, Forecasting index of temperature

CLC Number:

P468

Bo ZHANG,Chao YU,Wei HUANG,Chuan-lei CHEN. Effect of persistent blocking in Eurasian on temperature and precipitation in June in Greater Khingan Mountains and the precursor signal of temperature[J]. Journal of Meteorology and Environment, 2021, 37(4): 63-69.

Figures/Tables 11

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Effect of persistent blocking in Eurasian on temperature and precipitation in June in Greater Khingan Mountains and the precursor signal of temperature

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