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Mechanisms of an extraordinary East Asian summer monsoon event in July 2011

Seo, Kyong-Hwan and Son, Jun-Hyeok and Lee, Seung-Eon and Tomita, Tomohiko and Park, Hyo-Seok (2012) Mechanisms of an extraordinary East Asian summer monsoon event in July 2011. Geophysical Research Letters, 39 (5). Art. No. L05704. ISSN 0094-8276. https://resolver.caltech.edu/CaltechAUTHORS:20120412-090139298

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Abstract

Previous studies have demonstrated that the strong East Asian summer monsoon results mainly from the westward intensification of the North Pacific subtropical high (NPSH), or equivalently, the enhancement of the western North Pacific subtropical high. However, during early July in 2011 a strong southerly or southeasterly moist flow gave rise to a large amount of precipitation over southwestern Japan and Korea and anomalous dry conditions over central China because of the extraordinary intensification of the NPSH to the north. The formation of the anomalous high that occurred to the east of central Japan during early July is very rare, and its physical mechanisms are investigated in this study. The regressed circulation anomalies and wave-activity flux vectors for July 2011 and data from the previous 32 years show that two teleconnection patterns due to Rossby wave trains are the most important mechanisms: Rossby wave propagation from the eastern North Atlantic and western Europe to East Asia following the North Eurasian jet and East Asian jet in the upper level, and northward propagation of Rossby waves forced by diabatic heating over the western North Pacific (WNP) region in the lower level. This simultaneous forcing of a significant negative phase of the summertime North Atlantic Oscillation in the higher latitudes and enhanced diabatic heating over the subtropical WNP is found to be the cause of the abnormal development of the anomalous high to the east of central Japan, resulting in extremely wet conditions in Korea and southern Japan and dry conditions in southern China.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/2011GL050378 DOIUNSPECIFIED
http://www.agu.org/pubs/crossref/2012/2011GL050378.shtmlPublisherUNSPECIFIED
Additional Information:© 2012 by the American Geophysical Union. Received 16 November 2011; revised 20 January 2012; accepted 23 January 2012; published 15 March 2012. This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MEST) (2011–0021927) and the Korea Meteorological Administration Research and Development Program under grant CATER 2012–3071. We would like to thank the two anonymous reviewers for their helpful comments.
Funders:
Funding AgencyGrant Number
National Research Foundation of Korea (NRF)2011-0021927
Korea Meteorological Administration Research and Development ProgramCATER 2012-3071
Subject Keywords:monsoon
Issue or Number:5
Record Number:CaltechAUTHORS:20120412-090139298
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20120412-090139298
Official Citation:Seo, K.-H., J.-H. Son, S.-E. Lee, T. Tomita, and H.-S. Park (2012), Mechanisms of an extraordinary East Asian summer monsoon event in July 2011, Geophys. Res. Lett., 39, L05704, doi:10.1029/2011GL050378
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:30065
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:17 Apr 2012 18:33
Last Modified:03 Oct 2019 03:47

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