东北冷涡强度定义及特征分析

doi:10.3969/j.issn.1673-503X.2021.06.013

Abstract

Abstract:

Using the NCEP 1°×1° grid reanalysis data, according to the characteristics of temperature field having a cold center and the height field being a closed annular circulation of the Northeast Cold Vortex, two indexes of geopotential height difference and temperature difference were selected to formulate the definition method of the daily intensity of Northeast Cold Vortex and analyze the change characteristics of the Northeast Cold Vortex with different intensities divided by this definition.The results show that the occurrence frequency of medium-strength cold vortices is the highest, accounting for more than 50% of the annual number of days of cold vortices, followed by weak cold vortices, and the number of days of super-strong cold vortices is the least.The life history of weak cold vortices is about 3 days.During the super cold vortex activity, the center displacement changes greatly, and the life history is long, and the range of influence is wider.

Key words: Intensity of cold vortex, Cold vortex center displacement, Cold vortex life history

CLC Number:

P467

Peng-yu HU, Chuan-lei CHEN, Hai-feng LIN, Shuang XU, Ling-jun KONG, Qing LIU, Yong-ming JI, Zi-qi ZHAO. Definition and characteristics analysis of the intensity of Northeast Cold Vortex[J]. Journal of Meteorology and Environment, 2021, 37(6): 100-105.

Figures/Tables 7

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References 28

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等级	强度	划分标准	阈值区间	占总样本的百分比/(%)
1	弱	ΔHT＜-σ	1≤D＜4	27.5
2	中等	-σ≤ΔHT≤σ	4≤D＜20	55.6
3	强	σ＜ΔHT＜2σ	20≤D＜28	10.1
4	特强	2σ≤ΔHT	28≤D	6.7

等级	强度	中心位移变化/km	持续日数/d	移速/(km·d^-1)
1	弱	910.1	3.1	290.2
2	中等	947.6	4.1	232.7
3	强	1103.1	5.2	211.7
4	特强	1135.4	6.1	186.2

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Definition and characteristics analysis of the intensity of Northeast Cold Vortex

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