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Titre du document / Document title

Extratropical cyclone variability in the Northern Hemisphere winter from the NCEP/NCAR reanalysis data

Auteur(s) / Author(s)

GULEV S. K. (1) ; ZOLINA O. (1) ; GRIGORIEV S. (1) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) P.P. Shirshov Institute of Oceanology, RAS, 36, Nakhimovsky ave., 117218 Moscow, RUSSIE, FEDERATION DE

Résumé / Abstract

The winter climatology of Northern Hemisphere cyclone activity was derived from 6-hourly NCEP/NCAR reanalysis data for the period from 1958 to 1999, using software which provides improved accuracy in cyclone identification in comparison to numerical tracking schemes. Cyclone characteristics over the Kuroshio and Gulfstream are very different to those over continental North America and the Arctic. Analysis of Northern Hemisphere cyclones shows secular and decadal-scale changes in cyclone frequency, intensity, lifetime and deepening rates. The western Pacific and Atlantic are characterized by an increase in cyclone intensity and deepening during the 42-year period, although the eastern Pacific and continental North America demonstrate opposite tendencies in most cyclone characteristics. There is an increase of the number of cyclones in the Arctic and in the western Pacific and a downward tendency over the Gulf Stream and subpolar Pacific. Decadal scale variability in cyclone activity over the Atlantic and Pacific exhibits south-north dipole-like patterns. Atlantic and Pacific cyclone activity associated with the NAO and PNA is analyzed. Atlantic cyclone frequency demonstrates a high correlation with NAO and reflects the NAO shift in the mid 1970s, associated with considerable changes in European storm tracks. The PNA is largely linked to the eastern Pacific cyclone frequencies, and controls cyclone activity over the Gulf region and the North American coast during the last two decades. Assessment of the accuracy of the results and comparison with those derived using numerical algorithms, shows that biases inherent in numerical procedures are not negligible.

Revue / Journal Title

Climate dynamics    ISSN  0930-7575   CODEN CLDYEM 

Source / Source

2001, vol. 17, no10, pp. 795-809 (1 p.1/2)

Langue / Language

Anglais

Editeur / Publisher

Springer, Heidelberg, ALLEMAGNE  (1986) (Revue)

Mots-clés anglais / English Keywords

Extratropical cyclone

;

Winter

;

Climatology

;

Intensity

;

Lifetime

;

Decadal variation

;

Trajectory

;

Data analysis

;

Northern Hemisphere

;

Mots-clés français / French Keywords

Cyclone extratropical

;

Hiver

;

Climatologie

;

Intensité

;

Durée vie

;

Variation décennale

;

Trajectoire

;

Analyse donnée

;

Hémisphère Nord

;

Mots-clés espagnols / Spanish Keywords

Ciclón extratropical

;

Invierno

;

Climatología

;

Intensidad

;

Tiempo vida

;

Variación decenal

;

Trayectoria

;

Análisis datos

;

Hemisferio norte

;

Localisation / Location

INIST-CNRS, Cote INIST : 21148, 35400009861692.0040

Nº notice refdoc (ud4) : 1112685



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