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Extratropical cyclones (ETCs) in East Asia - University of Gothenburg, Sweden Till startsida
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Extratropical cyclones (ETCs) in East Asia

Lecture

Speaker: Dr. Seok-Woo Son, Associate professor at School of Earth and Environmental Sciences, Seoul National University, Seoul, South Korea.

Abstract:
Extratropical cyclones (ETCs) in East Asia are automatically detected and tracked by applying a Lagrangian tracking algorithm to the 850-hPa relative vorticity field. The ETC statistics, which are derived from ERA-Interim reanalysis dataset from 1979 to 2017, show that East Asian ETCs primarily form over Mongolia, South China, and the Kuroshio Current region with a maximum frequency of six to seven cyclones per month. Both Mongolia and South China ETCs are initiated on the leeward side of the mountains, exhibiting a maximum frequency and intensity in spring rather than in winter. While Mongolia ETCs form downstream of the Altai¿Sayan Mountains and develop through baroclinic processes, South China ETCs form on the leeward side of the Tibetan plateau and rapidly develope via diabatic heating.
The CMIP5 models qualitatively captured overall spatial distribution and seasonal cycle of East Asian ETCs. Noticeable model biases, however, appear over high terrain regions. Lee cyclogeneses downstream of the Tibetan plateau and Altai-Sayan Mountains are significantly underestimated. It is further found that most CMIP5 models predict a reduced ETC frequency and intensity in a warm climate. This change, which is robust over the western North Pacific especially in autumn, is consistent with an enhanced static stability and a reduced vertical wind shear in a warm climate.

Short bio of the speaker:
Seok-Woo is an atmospheric and climate dynamicist, primarily working on large-scale atmospheric circulation and stratosphere-troposphere coupling. Since his Ph.D. study at Penn State, he has been aiming to better understand the dynamical and physical nature of weather and climate systems in both the present and future climate. Beyond observational data analyses, he utilized a hierarchy of climate models to isolate the dynamical processes.

He started his academic career at the McGill University, Canada, as an assistant professor, holding the Canada Research Chair (Tier II). In 2012, he joined Seoul National University, South Korea, where he obtained his B.Sc. and M.Sc. degrees. He is an active member of WCRP-SPARC SSG and several commissions of IAMAS (ICCL, ICMA, ICDM), leading international research programs/projects. He is also serving academic journals, APJAS and PEPS, as an editor.

http://atmos.snu.ac.kr/swson/cv.html

Date: 6/19/2019

Time: 3:00 PM - 4:00 PM

Categories: Research

Location: Geovetarcentrum, Guldhedsgatan 5 A
Room Nordenskjöld (4.044) at GVC (Guldhedsgatan 5A)

Contact person: Deliang Chen

Page Manager: |Last update: 12/19/2012
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