BROWSE

Related Scientist

Researcher

기후물리 연구단
기후물리 연구단
more info

Influences of Boreal Summer Intraseasonal Oscillation on Heat Waves in Monsoon Asia

Cited 3 time in webofscience Cited 0 time in scopus
162 Viewed 26 Downloaded
Title
Influences of Boreal Summer Intraseasonal Oscillation on Heat Waves in Monsoon Asia
Author(s)
Pang-Chi Hsu; June-Yi Lee; Ha, Kyung-Ja; Chih-Hua Tsou
Publication Date
2017-09
Journal
JOURNAL OF CLIMATE, v.30, no.18, pp.7191 - 7211
Abstract
By analyzing observation-based high-resolution surface air temperature (SAT) data over the Asian monsoon region (here called "monsoon Asia'') for 1981-2007, the modulation by boreal summer intraseasonal oscillation (BSISO) of heat wave (HW) occurrence is examined. Strong SAT variability and a high probability of HW occurrence on intraseasonal time scales are found consistently in the densely populated regions over central India (CI), the YangtzeRiver valley in China (YR), Japan (JP), and theKorean Peninsula (KP). The two distinct BSISO modes (30-60-day BSISO1 and 10-30-day BSISO2) show different contributions to HW occurrence in monsoon Asia. A significant increase in HW occurrence over CI (YR) is observed during phases 2-3 (8-1) of BSISO2 when the 10-30-day anticyclonic and descending anomaly induce enhanced upward thermal heating and sensible heat flux (warm advection) around the areas. On the other hand, the northeastward propagating BSISO1 is closely connected to the increased HW probability over JP and KP. During phases 7-8 of BSISO1, the 30-60-day subsidence along with the low-level anticyclonic anomaly moves into northeastern Asia, leading to enhanced diabatic (adiabatic) warming near surface in JP (KP). Analysis of a three-dimensional streamfunction tendency equation indicates that diabatic cooling induced by the BSISO-related suppressed convections is the main forcing term of anticyclonic anomaly although it is largely offset by the decreased static stability associated with adiabatic warming. The BSISO-related vorticity advection leads to an anticyclonic (cyclonic) tendency to the northwestern (southeastern) part of the center of anticyclonic anomaly, favoring northwestward development of the BSISO anomalous circulations and thus providing a favorable condition for HW occurrence over the western Pacific-East Asia sector. (c) 2017 American Meteorological Society.
URI
https://pr.ibs.re.kr/handle/8788114/4165
ISSN
0894-8755
Appears in Collections:
Center for Climate Physics(기후물리 연구단) > Journal Papers (저널 논문)
Files in This Item:
Pang-Chi Hsu etc. (Lee June-Yi) 2017. Influences of Boreal Summer Intraseasonal Oscillation on Heat Waves in Monsoon Asia..pdfDownload

qrcode

  • facebook

    twitter

  • Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.
해당 아이템을 이메일로 공유하기 원하시면 인증을 거치시기 바랍니다.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse