중규모 소용돌이에 의해 발생하는 Kerama Gap을 통한 동중국해와 북서태평양 사이의 흐름 변동

Title
중규모 소용돌이에 의해 발생하는 Kerama Gap을 통한 동중국해와 북서태평양 사이의 흐름 변동
Alternative Title
Mesoscale-eddy-induced variability of flow through the Kerama Gap between the East China Sea and the western North Pacific
Author(s)
나한나; 박재훈; Mark Wimbush; Hirohiko Nakamura; Ayako Nishina; Xiao-Hua Zhu
Alternative Author(s)
나한나
Publication Year
2016-11-08
Abstract
The Kerama Gap (KG) is the deepest channel (sill depth 1050 m) along the Ryukyu Island chain connecting the East China Sea (ECS) to the western North Pacific. The observed mean flow through the KG from June 2009 to June 2011 is 2.0±0.7 Svinto the ECS. A 23-year (1993 to 2015) time series of the KG volume transport is obtained based on a good correlation between satellite altimeter-measured sea-level difference across the KG and 2-year-long in situ-measured volume transport.Comparison of the KG volume transport time series with satellite-measured sea-level anomaly maps reveals that KG transport fluctuations at 40– 200-day periods are strongly affected by mesoscale eddies near the KG. Consequently, KG transport’s interannual to decadal amplitude changes are associated with interannual to decadal eddy field changes to the east of the Ryukyu Island chain in the western North Pacific. The mesoscale-eddy-induced variability results in time-varying correlations between the KG throughflow and the Ryukyu Current volume transport south of Okinawa. Additionally, relationship of the KG throughflow with the Kuroshio east of Taiwan and the Kuroshio in the ECS is discussed based on the changes in eddy field.nto the ECS. A 23-year (1993 to 2015) time series of the KG volume transport is obtained based on a good correlation between satellite altimeter-measured sea-level difference across the KG and 2-year-long in situ-measured volume transport.Comparison of the KG volume transport time series with satellite-measured sea-level anomaly maps reveals that KG transport fluctuations at 40– 200-day periods are strongly affected by mesoscale eddies near the KG. Consequently, KG transport’s interannual to decadal amplitude changes are associated with interannual to decadal eddy field changes to the east of the Ryukyu Island chain in the western North Pacific. The mesoscale-eddy-induced variability results in time-varying correlations between the KG throughflow and the Ryukyu Current volume transport south of Okinawa. Additionally, relationship of the KG throughflow with the Kuroshio east of Taiwan and the Kuroshio in the ECS is discussed based on the changes in eddy field.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/24356
Bibliographic Citation
2016 PICES annual meeting, pp.173, 2016
Publisher
North Pacific Marine Science Organization
Type
Conference
Language
English
Publisher
North Pacific Marine Science Organization
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