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Phytoplankton Increase Along the Kuroshio Due to the Large Meander

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Title: Phytoplankton Increase Along the Kuroshio Due to the Large Meander
Authors: Barreto, Daniel Andres Lizarbe Browse this author
Saravia, Ricardo Chevarria Browse this author
Nagai, Takeyoshi Browse this author →KAKEN DB
Hirata, Takafumi Browse this author →KAKEN DB
Keywords: phytoplankton
eddy re-stratification
remote sensing
submesoscale eddies
Kuroshio large meander
Issue Date: 10-Aug-2021
Publisher: Frontiers Media
Journal Title: Frontiers in Marine Science
Volume: 8
Start Page: 677632
Publisher DOI: 10.3389/fmars.2021.677632
Abstract: The Kuroshio Large Meander (LM) is known to be highly aperiodic and can last from 1 to 10 years. Since a stationary cold core formed between the Kuroshio and the southern coast of Japan off Enshu-Nada and approaching warm saltier water on the eastern side of the LM changes the local environment drastically, many commercially valuable fish species distribute differently from the non-LM period, impacting local fisheries. Despite this importance of the LM, the influences of the LM on the low trophic levels such as phytoplankton and zooplankton have still been unclear. In this study, satellite daily sea surface chlorophyll data are analyzed in relation to the LM. The results show positive anomalies of the chlorophyll-a concentration along the Kuroshio path during the LM periods, 2004-2005 and 2017-2019, from the upstream off Shikoku to the downstream (140 degrees E). These positive anomalies are started by the triggering meander generated off south of Kyushu, which then slowly propagates to the downstream LM region in both the LM periods. Even though the detailed patterns along the Kuroshio region in the two LM periods were different, similar formations of the positive anomalies on the western side of the LM with shallower mixed layer depth are observed. Furthermore, we found clear relationships between the minimum distance from several stations along the coast to the Kuroshio axis and the mean chlorophyll-a anomaly, with significant correlations with the distance from different stations.
Type: article
Appears in Collections:北極域研究センター (Arctic Research Center) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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