Characteristics of Persistent Activity and Strength of Cold Vortex During May and June in Northeast China

Liu Gang; Wang Ning; Qin Yulin; Cao Ling; Chu Qucheng; Yao Yao

doi:10.11898/1001-7313.20160105

Vol.27, NO.1, 2016

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Liu Gang, Wang Ning, Qin Yulin, et al. Characteristics of persistent activity and strength of cold vortex during May and June in Northeast China. J Appl Meteor Sci, 2016, 27(1): 47-55. DOI: 10.11898/1001-7313.20160105.

Citation:

Liu Gang, Wang Ning, Qin Yulin, et al. Characteristics of persistent activity and strength of cold vortex during May and June in Northeast China. J Appl Meteor Sci, 2016, 27(1): 47-55. DOI: 10.11898/1001-7313.20160105.

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Characteristics of Persistent Activity and Strength of Cold Vortex During May and June in Northeast China

DOI: 10.11898/1001-7313.20160105

Liu Gang^{1,2,3
,
,},
Wang Ning⁴,
Qin Yulin⁴,
Cao Ling⁵,
Chu Qucheng⁶,
Yao Yao⁴

1.
Jilin Institute of Meteorological Science, Changchun 130062
2.
Laboratory of Research for Middle-high Latitude Circulation System and East Asian Monsoon, Changchun 130062
3.
College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000
4.
Jilin Meteorological Observatory, Changchun 130062
5.
Jilin Provincial Meteorological Service Center, Changchun 130062
6.
Department of Physics, Yangzhou University, Yangzhou 225002

Received Date: 2015-07-17
Rev Recd Date: 2015-09-25
Publish Date: 2016-01-31

Abstract

Abstract

Using the NCEP/NCAR daily reanalysis data from 1960 to 2012, processes of the northeast cold vortex (NECV) are identified objectively. Combined with the characteristic of precipitation, a process standard of NECV persistent activities is proposed, and quantitative analysis is done using the NECV intensity index which has great significance on its persistence. If the NECV is stronger, the activity of the blocking situation over the Ural Mountains and the Lake Baikal in May, and blocking situation over the Okhotsk Sea in June is more frequent. The composition of high and low index year circulation is calculated including the geopotential height, temperature and wind between 1000 hPa and 200 hPa, and two features in the identification zone of NECV are revealed. First, the NECV converge in middle to upper troposphere (from 500 hPa to 200 hPa), having a deep and cold structure. The low pressure system exists form lower troposphere (1000 hPa) to upper troposphere (200 hPa) and a strong baroclinic component exists in geopotential height field. There is cold center in upper troposphere and thermal trough in lower troposphere. In middle to upper troposphere, westerlies have obvious shunt and confluent, and the blocking situation between them shows higher in northeast and lower in southwest. Second, the NECV converge in middle to lower troposphere (from 850 hPa to 1000 hPa), the cold center is shallow and the structure is not obvious. It is straight in the westerlies in middle to upper troposphere (from 500 hPa to 200 hPa) and the blocking situation has vanished. The weak cold center only exists in upper level, and the lower troposphere is controlled by low pressure and warm ridge. This definition of cold vortex persistent activities provides basis and reference for further study on its climate effect and short-term climate prediction.
- northeast cold vortex;
- persistent activities;
- index of cold vortex;
- circulation characteristics

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References(20)

Figures and Tables

图 1 1960—2012年5—6月东北冷涡活动年际变化特征

(a) 发生频次，(b) 活动日数

Fig. 1 Annual variation of NECV activity during May and June from 1960 to 2012

(a) occurrence frequency, (b) the number of activity days

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图 2 1960—2012年5—6月东北冷涡活动随冷涡过程持续时间变化

(a) 发生频次，(b) 活动日数

Fig. 2 The variation of persistence time of NECV activity with different variables during May and June from 1960 to 2012

June from 1960 to 2012 (a) occurrence frequency, (b) the number of activity days

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图 3 5—6月东北冷涡活动空间分布特征

(a) 随经度变化, (b) 随纬度变化

Fig. 3 The spatial distribution of NECV activity during May and June

(a) variation with longitude, (b) variation with latitude

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Fig. 4 Comparison between the number of NECV persistent activity days and the number of NECV activity days during May and June

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图 5 1960—2012年东北冷涡持续活动过程期间500 hPa高度场合成 (单位：gpm)

(a)5月合成，(b)6月合成

Fig. 5 Composition of 500 hPa geopotential field of NECV persistent activities from 1960 to 2012(unit:gpm)

(a) in May, (b) in June

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Fig. 6 Correlation coefficients between NECV intensity index and 500 hPa geopotential height in May (a), 500 hPa geopotential height in June (b), 500 hPa temperature in May (c), 500 hPa temperature in June (d)

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Fig. 7 Composition of height (the shaded), temperature (the dotted, unit:℃) and wind (the vector) fields of NECV in different strength in June from 1960 to 2012

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Table 1 Statistical characteristics of the northeast cold vortex (NECV) during May and June from 1960 to 2012

时段	日数/d	频次	所占比例%	平均频次	平均日数/d	冷涡平均维持日数/d
5—6月	1710	388	52.9	7.32	32.3	4.58
5月	757	181	46.1	3.42	14.3	4.18
6月	953	207	59.9	3.91	18.0	4.60

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