동중국해와 북서태평양 사이에 존재하는 케라마갭 통과류의 변동성에 대한 중규모 와류의 영향

Title
동중국해와 북서태평양 사이에 존재하는 케라마갭 통과류의 변동성에 대한 중규모 와류의 영향
Alternative Title
Variability of the flow through the Kerama Gap between the East China Sea and the Northwestern Pacific induced by mesoscale eddy activities
Author(s)
나한나; 박재훈; Mark Wimbush; Hirohiko Nakamura; Ayako Nishina; Xiao-Hua Zhu
Alternative Author(s)
박재훈
Publication Year
2014-10-24
Abstract
The Kerama Gap (KG), near the middle of the Ryukyu Island chain, is the deepest channel with a sill depth of 1050 m connecting the East China Sea (ECS) to the Northwestern Pacific. The observed mean flow through the KG from June 2009 to June 2011 is 2.0±0.7 Sv into the ECS. A good correlation is obtained between satellite altimeter-measured sea-level anomaly difference across the KG and 2-year-long in situ-measured volume transport, which allows us to produce 7-day interval 20-year time series of the KG volume transport. The twenty-year mean volume transport is 1.5±0.2 Sv with standard deviation of 2.5 Sv. Comparison of KG volume transport time series with satellite-measured sea surface height maps reveals that the KG transport fluctuations at 40− 150-day periods is strongly affected by mesoscale eddies around the KG. Consequently, its interannual to decadal amplitude changes are associated with interannual to decadal eddy field changes to the east of the Ryukyu Island chain in the Northwestern Pacific, which also determine the time-varying correlations between the KG through flow and the Ryukyu Current volume transport south of Okinawa.e 2011 is 2.0±0.7 Sv into the ECS. A good correlation is obtained between satellite altimeter-measured sea-level anomaly difference across the KG and 2-year-long in situ-measured volume transport, which allows us to produce 7-day interval 20-year time series of the KG volume transport. The twenty-year mean volume transport is 1.5±0.2 Sv with standard deviation of 2.5 Sv. Comparison of KG volume transport time series with satellite-measured sea surface height maps reveals that the KG transport fluctuations at 40− 150-day periods is strongly affected by mesoscale eddies around the KG. Consequently, its interannual to decadal amplitude changes are associated with interannual to decadal eddy field changes to the east of the Ryukyu Island chain in the Northwestern Pacific, which also determine the time-varying correlations between the KG through flow and the Ryukyu Current volume transport south of Okinawa.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/25901
Bibliographic Citation
PICES Annual Meeting, pp.176, 2014
Publisher
PICES
Type
Conference
Language
English
Publisher
PICES
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