An east-west contrast of upper ocean heat content variation south of the subpolar front in the East/Japan Sea SCIE SCOPUS

Cited 7 time in WEB OF SCIENCE Cited 6 time in Scopus
Title
An east-west contrast of upper ocean heat content variation south of the subpolar front in the East/Japan Sea
Author(s)
Yoon, Seung-Tae; Chang, Kyung-Il; Na, Hanna; Minobe, Shoshiro
Publication Year
2016-08
Abstract
Long-term variability of nonseasonal ocean heat content (OHC) in the upper 500 m in the East/ Japan Sea (EJS) exhibits a distinct east-west contrast during the recent 30 years. The contrasting OHC variations are revisited and investigated more in detail by analyzing two observational data sets, the gridded data from 1976 to 2007 and in situ data from 1976 to 2011 in the southwestern EJS that covers the zone of western boundary current. The OHC variability shows in-phase and predominant decadal variation in both east and west regions before 1995, but uncorrelated and predominant interannual variations after 1995. Heaving effects due to major branches of warm currents in the EJS, the East Korea Warm Current (EKWC) in the western part and other two branches in the eastern part, mainly contribute to the OHC variations. The heaving effect in the western EJS is shown to be associated with changes in winter wind-stress curl field in the northern EJS. Weakening of the subpolar gyre due to weakening of positive wind-stress curl in the Japan Basin related with wintertime Western Pacific teleconnection pattern and Siberian High appears to enhance the northward penetration of the EKWC resulting in an increase of OHC in the western EJS. The heaving effect in the eastern EJS is significantly correlated with the Siberian High, but the causative mechanism is inconclusive. This study also demonstrates the importance of using highly resolved data sets for areas affected by strong and narrow boundary currents in computing and understanding the OHC variability.
ISSN
2169-9275
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/2157
DOI
10.1002/2016JC011891
Bibliographic Citation
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, v.121, no.8, pp.6418 - 6443, 2016
Publisher
AMER GEOPHYSICAL UNION
Subject
TSUSHIMA WARM CURRENT; ASIAN WINTER MONSOON; WIND-STRESS CURL; INTERDECADAL VARIABILITY; DECADAL VARIABILITY; VOLUME TRANSPORT; NORTH PACIFIC; WATER MASSES; JAPAN SEA; CIRCULATION
Keywords
East/Japan Sea (EJS); heaving effect; ocean heat content; Siberian High; upper circulation; western Pacific teleconnection pattern
Type
Article
Language
English
Document Type
Article
Publisher
AMER GEOPHYSICAL UNION
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