Concurrent Decadal Mesoscale Eddy Modulations in the Western North Pacific Subtropical Gyre
Satellite altimeter data of the past two decades are used to investigate the low-frequency mesoscale eddy variability inside the western North Pacific subtropical gyre.Eddy activity modulations with a decadal timescale are detected concurrently within the 18o-28oN band,including the three branches of the Subtropical Countercurrent (STCC) and the Hawaiian Lee Countercurrent (HLCC).Lagging behind the Pacific decadal oscillation (PDO) index by six month,enhanced eddy activities were detected in 1995-98 and 2003-06,whereas the eddy activities were below the average in 1999-2002 and 2009-11.Analysis of the temperature and salinity data that became available after 2001 via the International Argo Program reveals that the modulating eddy activities are due to the decadal change in the upper ocean eastward shear in the broad-scale STCC/HLCC band.By conducting an upper ocean temperature budget analysis,we found that this observed eastward shear change can be effectively accounted for by the decadally-varying surface heat flux forcing.
Bo Qiu Shuiming Chen
Department of Oceanography, University of Hawaii at Manoa, 1000 Pope Road, Honolulu, HI 96822
国际会议
The 17th Pacific -Asian Marginal Seas Meeting(第十七届太平洋与亚洲边缘海国际会议)
杭州
英文
6-13
2013-04-23（万方平台首次上网日期，不代表论文的发表时间）