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Cause Of Northward Shift Of The Western Pacific Subtropical High In Summer 2018

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Title:Cause Of Northward Shift Of The Western Pacific Subtropical High In Summer 2018
Authors:Zhang, Yixin
Contributors:Li, Tim (advisor)
Atmospheric Sciences (department)
Keywords:Atmospheric sciences
circulation response to anomalous heating in the tropics
ECHAM simulation
Rossby wave energy dispersion
Western Pacific Subtropical High
Date Issued:2020
Publisher:University of Hawai'i at Manoa
Abstract:The western Pacific subtropical high (WPSH) is an important atmospheric circulation system that affects weather and climate in East Asia. In 2018 summer, the WPSH shifted northward from its climatological location, causing devastating weather in East Asia. The cause of the abnormal northward shift of the WPSH was investigated through the diagnosis of NCEP reanalysis data and idealized numerical model experiments. It was found that a positive geopotential height and an anticyclonic anomaly with an equivalent barotropic structure appeared in the mid-latitude North Pacific. Such a circulation anomaly was accompanied by enhanced convective heating over the tropical western North Pacific, tropical eastern North Pacific, India, and North Africa. Idealized numerical model experiments further indicated that the heating in the western Pacific played a dominant role in generating the anomalous circulation in the North Pacific, followed by the anomalous heating effect over India, North Africa and the eastern Pacific. A further examination of the reanalysis data during 1979-2018 showed that a similar northward-shifting event happened in 1994 and 2000, with similar distributions of diabatic heating anomalies in the tropics.
Pages/Duration:47 pages
Rights:All UHM dissertations and theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner.
Appears in Collections: M.S. - Atmospheric Sciences

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