Seasonal Cycle of Volume Transport through Kerama Gap Revealed by a 20-year Global HYbrid Coordinate Ocean Model Reanalysis

Zhitao Yu, US Naval Research Laboratory, Washington, DC, United States, E. Joseph Metzger, Naval Research Laboratory, Stennis Space Center, MS, United States, Prasad Thoppil, John C. Stennis Space Center, Stennis Space Center, MS, United States, Harley E Hurlburt, Naval Research Lab Stennis Space Center, Stennis Space Center, MS, United States, Luis Zamudio, Florida State University, Tallahassee, FL, United States, Ole Martin Smedstad, Vencore, Stennis Space Center, MS, United States, Hanna Na, Hokkaido University, Sapporo, Japan, Hirohiko Nakamura, Kagoshima University, Kagoshima, Japan and Jae-Hun Park, KIOST Korea Institute of Ocean Science and Technology, Ansan, Korea, Republic of (South)
Abstract:
The temporal variability of volume transport from the North Pacific Ocean to the East China Sea (ECS) through Kerama Gap (between Okinawa Island and Miyakojima Island − a part of Ryukyu Islands Arc) is investigated using a 20-year global HYbrid Coordinate Ocean Model (HYCOM) reanalysis with the Navy Coupled Ocean Data Assimilation from 1993 to 2012. The HYCOM mean transport is 2.1 Sv (positive into the ECS, 1 Sv = 106 m3/s) from June 2009 to June 2011, in good agreement with the observed 2.0 Sv transport during the same period. This is similar to the 20-year mean Kerama Gap transport of 1.95 ± 4.0 Sv. The 20-year monthly mean volume transport (transport seasonal cycle) is maximum in October (3.0 Sv) and minimum in November (0.5 Sv). The annual variation component (345-400 days), mesoscale eddy component (70 - 345 days), and Kuroshio meander component (< 70 days) are separated to determine their contributions to the transport seasonal cycle. The annual variation component has a close relation with the local wind field and increases (decreases) transport into the ECS through Kerama Gap in the summer (winter). Most of the variations in the transport seasonal cycle come from the mesoscale eddy component. The impinging mesoscale eddies cause an increase of the transport into the ECS in January, February, May, and October, and the decrease in March, April, November, and December, but not much change in summer from June to September. The Kuroshio meander components cause smaller transport variations in summer than in winter.
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