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Dynamically Induced Anomalies of the Japan/East Sea Surface Temperature
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  • Journal title : Ocean and Polar Research
  • Volume 31, Issue 1,  2009, pp.11-29
  • Publisher : Korea Institute of Ocean Science & Technology
  • DOI : 10.4217/OPR.2009.31.1.011
 Title & Authors
Dynamically Induced Anomalies of the Japan/East Sea Surface Temperature
Trusenkova, Olga; Lobanov, Vyacheslav; Kaplunenko, Dmitry;
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 Abstract
Variability of sea surface temperature (SST) in the Japan/East Sea (JES) was studied using complex empirical orthogonal function (CEOF) analysis. Two daily data sets were analyzed: (1) New Generation 0.05o-gridded SST from Tohoku University, Japan (July 2002-July 2006), and (2) 0.25o-gridded SST from the Japan Meteorological Agency (October 1993-November 2006). Linkages with wind stress curl were revealed using 6-h 1o-gridded surface zonal and meridional winds from ancillary data of the Sea- WiFS Project, a special National Centers for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR) product (1998-2005). SST anomalies (SSTA) were obtained by removing the seasonal signal, estimated as the leading mode of the CEOF decomposition of the original SST. Leading CEOF modes of residual SSTA obtained from both data sets were consistent with each other and were characterized by annual, semiannual, and quasi-biennial time scales estimated with 95% statistical significance. The Semiannual Mode lagged 2 months behind the increased occurrence of the anticyclonic (AC) wind stress curl over the JES. Links to dynamic processes were investigated by numerical simulations using an oceanic model. The suggested dynamic forcings of SSTA are the inflow of subtropical water into the JES through the Korea Strait, divergence in the surface layer induced by Ekman suction, meridional shifts of the Subarctic Front in the western JES, AC eddy formation, and wind-driven strengthening/weakening of large-scale currents. Events of west-east SSTA movement were identified in July-September. The SSTA moved from the northeastern JES towards the continental coast along the path of the westward branch of the Tsushima Current at a speed consistent with the advective scale.
 Keywords
moving anomalies;oceanic model;semiannual time-scale;wind-driven circulation;wind stress curl;
 Language
English
 Cited by
1.
Mesoscale eddies in the area of peter the great bay according to satellite data, Izvestiya, Atmospheric and Oceanic Physics, 2013, 49, 9, 939  crossref(new windwow)
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