Observations of Kuroshio Flow Variations in the East China Sea
NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEANOGRAPHY DIV
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Kuroshio velocity Structure and transport in the East China Sea ECS were investigated as part of a 23-month study using inverted echo sounders and acoustic Doppler current profilers ADCPs along the regularly sampled PN-line. Flow toward the northeast is concentrated near the continental shelf with the mean surface velocity maximum located 30 km offshore from the shelf break taken as the 170 m isobath. There are two regions of southwestward flow a deep countercurrent over the continental slope beneath the Kuroshio axis and a recirculation offshore which extends throughout the whole water column. There is a bimodal distribution to the depth of maximum velocity with occurrence peaks at the surface and 210 dbar. When the maximum velocity is located within the top 80 m of the water column, it ranges between 0.36 ms and 2.02 ms when the maximum velocity is deeper than 80 m, it ranges between 0.31 ms and 1.11 ms. The 13-month mean net absolute transport of the Kuroshio in the ECS is 18.5 0.8 Sv standard deviation, a 4.0 Sv. The mean positive and negative portions of this net flow are 24.0 0.9 Sv and -5.4 0.3 Sv, respectively.
- Physical and Dynamic Oceanography