Variations in Extratropical Cyclone Activity in Northern East Asia

WANG Xinmin; ZHAI Panmao; WANG Cuicui

doi:10.1007/s00376-009-0471-8

Impact Factor: 5.8

Volume 26 Issue 3

May 2009

Article Contents

Article > ADVANCES IN ATMOSPHERIC SCIENCES > 2009 > 26(3): 471-479

Variations in Extratropical Cyclone Activity in Northern East Asia

1.
Meteorological Observatory in Henan Province, Zhengzhou 450003;Chinese Academy of Meteorological Sciences, Beijing 100081;Chinese Academy of Meteorological Sciences, Beijing 100081

doi: 10.1007/s00376-009-0471-8

Abstract
References
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Abstract:
Based on an improved objective cyclone detection and tracking algorithm, decadal variations in extratropical cyclones in northern East Asia are studied by using the ECMWF 40 Year Reanalysis (ERA-40) sea-level pressure data during 1958--2001. The results reveal that extratropical cyclone activity has displayed clear seasonal, interannual, and decadal variability in northern East Asia. Spring is the season when cyclones occur most frequently. The spatial distribution of extratropical cyclones shows that cyclones occur mainly within the 40o--50oN latitudinal band in northern East Asia, and the most frequent region of occurrence is in Mongolia. Furthermore, this study also reveals the fact that the frequency of extratropical cyclones has significantly decreased in the lower latitude region of northern East Asia during 1958--2001, but decadal variability has dominated in higher latitude bands, with frequent cyclone genesis. The intensity of extratropical cyclones has decreased on an annual and seasonal basis. Variation of the annual number of cyclones in northern East Asia is associated with the mean intensity of the baroclinic frontal zone, which is influenced by climate warming in the higher latitudes. Moreover, the dipole structure of extratopical cyclone change, with increases in the north and decreases in the southern part of northern East Asia, is related to the northward movement of the baroclinic frontal zone on either side of 110oE.
- ERA-40,
- SLP,
- extratropical cyclones,
- variability,
- East Asia,
- cyclone detection and tracking algorithms
References

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Manuscript History

Manuscript received: 10 May 2009

Manuscript revised: 10 May 2009

通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Variations in Extratropical Cyclone Activity in Northern East Asia

1. Meteorological Observatory in Henan Province, Zhengzhou 450003;Chinese Academy of Meteorological Sciences, Beijing 100081;Chinese Academy of Meteorological Sciences, Beijing 100081

Manuscript received: 2009-05-10
Manuscript revised: 2009-05-10

Abstract: Based on an improved objective cyclone detection and tracking algorithm, decadal variations in extratropical cyclones in northern East Asia are studied by using the ECMWF 40 Year Reanalysis (ERA-40) sea-level pressure data during 1958--2001. The results reveal that extratropical cyclone activity has displayed clear seasonal, interannual, and decadal variability in northern East Asia. Spring is the season when cyclones occur most frequently. The spatial distribution of extratropical cyclones shows that cyclones occur mainly within the 40o--50oN latitudinal band in northern East Asia, and the most frequent region of occurrence is in Mongolia. Furthermore, this study also reveals the fact that the frequency of extratropical cyclones has significantly decreased in the lower latitude region of northern East Asia during 1958--2001, but decadal variability has dominated in higher latitude bands, with frequent cyclone genesis. The intensity of extratropical cyclones has decreased on an annual and seasonal basis. Variation of the annual number of cyclones in northern East Asia is associated with the mean intensity of the baroclinic frontal zone, which is influenced by climate warming in the higher latitudes. Moreover, the dipole structure of extratopical cyclone change, with increases in the north and decreases in the southern part of northern East Asia, is related to the northward movement of the baroclinic frontal zone on either side of 110oE.

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