중규모 와류 기인 케라마갭 통과류 변동성

Title
중규모 와류 기인 케라마갭 통과류 변동성
Alternative Title
Mesoscale-eddy-induced variability of flow through the Kerama Gap
Author(s)
나한나; 박재훈; Mark Wimbush; Hirohiko Nakamura; Ayako Nishina; Xiao-Hua Zhu
Alternative Author(s)
박재훈
Publication Year
2015-04-21
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 Sv into the ECS. A 7-day-interval 20-year (October 1992 to September 2012) 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. The 20-year mean volume transport is 1.5±0.2 Sv with standard deviation 2.5 Sv. 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 transports 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 Currentvolume 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.into the ECS. A 7-day-interval 20-year (October 1992 to September 2012) 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. The 20-year mean volume transport is 1.5±0.2 Sv with standard deviation 2.5 Sv. 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 transports 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 Currentvolume 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/25631
Bibliographic Citation
18th Pacific-Asian Marginal Seas Meeting, pp.3, 2015
Publisher
PAMS
Type
Conference
Language
English
Publisher
PAMS
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