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Climatological mean features and interannual to decadal variability of ring formations in the Kuroshio Extension region

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Title: Climatological mean features and interannual to decadal variability of ring formations in the Kuroshio Extension region
Authors: Sasaki, Yoshi N. Browse this author
Minobe, Shoshiro Browse this author
Keywords: Kuroshio Extension
Pinch-off ring
Heat transport
Interannual to decadal variability
Issue Date: Oct-2015
Publisher: Springer
Journal Title: Journal of oceanography
Volume: 71
Issue: 5
Start Page: 499
End Page: 509
Publisher DOI: 10.1007/s10872-014-0270-4
Abstract: This study examines the climatological mean features of oceanic rings shed from the Kuroshio Extension (KE) jet and their interannual to decadal variability using satellite altimeter observations from October 1992 to December 2010. To objectively capture ring shedding from the KE jet, a new method that consists of the detection of the jet length changes and the tracking of a ring is proposed. Spatial distribution of the ring formations in the KE region indicates that cyclonic (cold-core) rings were most frequently formed in the upstream region between 143A degrees and 147A degrees E around the steady meander of the KE jet. In contrast, most of anticyclonic (warm-core) rings were formed in the downstream region west of the Shatsky Rise. These pinched-off rings in both the upstream and downstream regions generally propagated westward, but about two-thirds of the rings were reabsorbed by the jet. Nevertheless, about one-fourth of the meridional eddy heat transport at the latitude of the KE resulted from the rings that are not reabsorbed by the jet. The number of ring formations showed substantial interannual to decadal variability. In the upstream and downstream KE region, decadal and interannual variability was dominant, respectively. These ring formation fluctuations were negatively correlated with the strength of the KE jet. It is also revealed that the ring formation variations play an important role in sea surface temperature changes north of the KE jet.
Rights: The final publication is available at Springer via
Type: article (author version)
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 佐々木 克徳

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