Open AccessStable volume and heat transports of the North Pacific subtropical gyre revealed by identifying the Kuroshio in synoptic hydrography south of Japan
Author(s) -
Nagano Akira,
Ichikawa Kaoru,
Ichikawa Hiroshi,
Tomita Hiroyuki,
Tokinaga Hiroki,
Konda Masanori
Publication year - 2010
Publication title -
journal of geophysical research: oceans
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2009jc005747
Subject(s) - ocean gyre , hydrography , subtropics , mesoscale meteorology , oceanography , climatology , geology , meander (mathematics) , anticyclone , mode water , latitude , subtropical ridge , eddy , boundary current , environmental science , ocean current , geography , meteorology , turbulence , precipitation , geometry , mathematics , geodesy , fishery , biology
We conducted synoptic hydrographic surveys three times under distinctly different conditions of the Kuroshio in the region off the southern coast of Japan; the large‐meander (October 2004) and non‐large‐meander (September 2005 and September 2006) states. As a result of the water mass analysis, we could separate the volume and heat transports of the North Pacific subtropical gyre from the local recirculation gyre and mesoscale eddies. Despite the different flow conditions of the Kuroshio, the volume transport and the volume transport‐averaged temperature of the subtropical gyre fluctuate within the ranges of 23.3–29.0 × 10 6 m 3 s −1 and 17.3–17.6°C, respectively, which are quite stable with respect to those for the Kuroshio south of Japan estimated in the past studies. Taking into account the decrease in the volume transport‐averaged temperature in the North Pacific interior region, the net heat transport of the subtropical gyre across the latitude of 30°N was estimated to be between 0.19 and 0.22 × 10 15 W.