|Title:||Injection of High Chlorophyll-a Waters by a Branch of Kuroshio Current into the Nutrient-Poor North Pacific Subtropical Gyre||Authors:||Chow, Chun-Hoe
|Keywords:||Kuroshio branch;salinity;chlorophyll-a;North Pacific subtropical gyre;satellite observation;in situ observation||Issue Date:||1-Apr-2022||Publisher:||MDPI||Journal Volume:||14||Journal Issue:||7||Source:||REMOTE SENSING||Abstract:||
An unusual eastward flow was observed branching out from the Kuroshio Current near the island of Taiwan in the western North Pacific in during the period June-July 2010. The branch meandered eastward approximately 21 degrees N, carrying high chlorophyll-a (Chla) waters for over 1000 km from 125 degrees E into the nutrient-poor North Pacific subtropical gyre (NPSG). The branch was warmer and fresher than the surrounding waters, with temperature-salinity properties resembling those of Kuroshio Current. Thus, we called it the eastward cross-shore Kuroshio branch (ECKB). Injecting fresher waters far into the central NPSG, the ECKB flowed at a mean surface speed of 0.5 m per second, as shown in satellite altimeters, a Lagrangian drifter, and the Japan-Meteorological-Agency (JMA) 137 degrees E-meridian cruise transect. The mechanism of the ECKB was linked to a surface cyclonic wind anomaly to the north at approximately 22-24 degrees N. The cyclonic wind anomaly cooled the ocean surface beneath it via Ekman suction and then enhanced the subtropical front to its south at approximately 21 degrees N near the Kuroshio Current. The strengthened subtropical front subsequently induced an eastward flow that bifurcated from the main stream of the northward-flowing Kuroshio Current.
|Appears in Collections:||海洋環境資訊系|
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