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Titre du document / Document title

Delayed influence of the Indian Ocean Dipole mode on the East Asia-West Pacific monsoon: possible mechanism

Auteur(s) / Author(s)

KRIPALANI R. H. (1) ; OH J. H. (1) ; CHAUDHARI H. S. (2) ;

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

(1) Department of Environmental and Atmospheric Sciences, Pukyong National University, Busan, COREE, REPUBLIQUE DE
(2) Indian Institute of Tropical Meteorology, Pune, INDE

Résumé / Abstract

This study investigates the possible physical processes for the delayed response of the East Asia-West Pacific summer monsoon to the Indian Ocean Dipole Mode (IODM) through the Eurasian continent based on composite and correlation analyses. The media carrying the memory for this delayed response is identified. Results reveal that the peak positive phase of the dipole during autumn could suppress the following summer monsoon activity over East Asia three seasons later, in particular over the Korea-Japan sector, South China and the adjacent West Pacific region. Composite and correlation analysis suggests that the autumn positive phase of the dipole could induce heavy snow over Eastern Eurasia, north of the Korea-Japan (EENKJ) peninsula, during the following winter and spring seasons. This could increase the temperature gradient conducive to transport cold and dry air from the north towards south over the warmer East Asia-West Pacific domain during the following summer. The sea surface temperature (SST) reveals that the positive phase of the dipole mode during autumn is associated with the warm phase (El Nino) of the El Nino Southern Oscillation (ENSO) over the Pacific. As the seasons progress through to summer, the warm phase over the Pacific transforms to a developing cold phase (La Nina) with warmer SSTs over the West Pacific. Both the anomalous northerly winds due to heavy snow and the anomalous warm SST over the West Pacific due to La Nina displace the North Pacific Subtropical High (NPSH) eastwards, resulting in a weak cross-equatorial flow and a weak low-level jet. This could inhibit moisture supply from the Pacific leading to subdued rainfall activity. The footprints of the IODM for delayed response, three seasons later, could be carried by the snow distribution over Eastern Eurasia by the northern route. Furthermore, correlation analysis suggests that the relationships with IODM are slighter stronger than with the ENSO phenomenon. However, partial correlation analysis probably suggests that both the IODM and ENSO work cooperatively for the summer monsoon rainfall anomalies over East Asia-West Pacific region.

Revue / Journal Title

International journal of climatology    ISSN  0899-8418 

Source / Source

2010, vol. 30, no2, pp. 197-209 [13 page(s) (article)] (1 p.1/4)

Langue / Language

Anglais

Editeur / Publisher

Wiley, Chichester, ROYAUME-UNI  (1989) (Revue)

Mots-clés anglais / English Keywords

Pacific Ocean

;

Seasonal teleconnection

;

Dynamical climatology

;

Eurasia

;

West Pacific

;

Asia

;

climate variability

;

Delay effect

;

atmospheric precipitation

;

La Nina

;

Southern oscillation

;

El Nino

;

mechanism

;

Correlation analysis

;

Composite analysis

;

Indian ocean dipole

;

Teleconnection

;

Summer monsoon

;

ocean-atmosphere interaction

;

Mots-clés français / French Keywords

Océan Pacifique

;

Téléconnexion saisonnière

;

Climatologie dynamique

;

Eurasie

;

Océan Pacifique Ouest

;

Asie

;

Variabilité climatique

;

Effet retard

;

Précipitation atmosphérique

;

La Nina

;

Oscillation australe

;

El Nino

;

Mécanisme

;

Analyse corrélation

;

Analyse composite

;

Dipôle océan Indien

;

Téléconnexion

;

Mousson été

;

Interaction atmosphère océan

;

Mots-clés espagnols / Spanish Keywords

Océano Pacífico

;

Teleconexión estacional

;

Climatología dinámica

;

Eurasia

;

Asia

;

Efecto retardo

;

Precipitación atmosférica

;

Oscilación austral

;

Análisis correlación

;

Análisis compuesto

;

Dipolo océano Indico

;

Teleconexión

;

Monzón verano

;

Mots-clés d'auteur / Author Keywords

Indian Ocean

;

Eurasia

;

East Asia-West Pacific

;

Localisation / Location

INIST-CNRS, Cote INIST : 19299, 35400019001362.0040

Nº notice refdoc (ud4) : 22338278



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