TY - JOUR
T1 - Variations of Kuroshio geostrophic transport south of Japan estimated from long-term IES observations
AU - Kakinoki, Koji
AU - Imawaki, Shiro
AU - Uchida, Hiroshi
AU - Nakamura, Hirohiko
AU - Ichikawa, Kaoru
AU - Umatani, Shin Ichiro
AU - Nishina, Ayako
AU - Ichikawa, Hiroshi
AU - Wimbush, Mark
N1 - Funding Information:
The repeated hydrographic survey data used in this study were obtained by members of the ASUKA group and various Japanese agencies. The satellite altimetry data (TOPEX/POSEIDON) were provided by the Goddard Space Flight Center of NASA. The altimeter products (Jason-1) were produced by Ssalto/Duacs and distributed by Aviso with support from Cnes. Dr. Daisuke Ambe kindly provided the Kuroshio axis data. We thank anonymous reviewers for useful comments. This study was supported by the Core Research for Evolutional Science and Technology (CREST) of Japan Science and Technology Corporation (JST) and by a Grant-in-aid for Scientific Research from the Ministry of Education, Culture, Sports, Science, and Technology of Japan.
PY - 2008/6
Y1 - 2008/6
N2 - Two inverted echo sounders were maintained on coastal and offshore sides of the Kuroshio south of Japan from October 1993 to July 2004. Applying the gravest empirical mode method, we obtained a time series of geostrophic transport. Estimated transports generally agree well with geostrophic transports estimated from hydrography. Their agreement with the hydrographic transports is better than that of transports estimated from satellite altimetry data. The geostrophic transport is expressed as the surface transport per unit depth multiplied by the equivalent depth. The geostrophic transport varies mostly with the surface transport and fractionally with the equivalent depth. Seasonal variation of the geostrophic transport has a minimum in March and a maximum in September, with a range of about one fifth of the total transport.
AB - Two inverted echo sounders were maintained on coastal and offshore sides of the Kuroshio south of Japan from October 1993 to July 2004. Applying the gravest empirical mode method, we obtained a time series of geostrophic transport. Estimated transports generally agree well with geostrophic transports estimated from hydrography. Their agreement with the hydrographic transports is better than that of transports estimated from satellite altimetry data. The geostrophic transport is expressed as the surface transport per unit depth multiplied by the equivalent depth. The geostrophic transport varies mostly with the surface transport and fractionally with the equivalent depth. Seasonal variation of the geostrophic transport has a minimum in March and a maximum in September, with a range of about one fifth of the total transport.
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U2 - 10.1007/s10872-008-0030-4
DO - 10.1007/s10872-008-0030-4
M3 - Article
AN - SCOPUS:42649088755
SN - 0916-8370
VL - 64
SP - 373
EP - 384
JO - Journal of Oceanography
JF - Journal of Oceanography
IS - 3
ER -