Effect of the Intensified Sub-Thermocline Eddy on Strengthening the Mindanao Undercurrent in 2019 SCIE SCOPUS

Cited 1 time in WEB OF SCIENCE Cited 1 time in Scopus
Title
Effect of the Intensified Sub-Thermocline Eddy on Strengthening the Mindanao Undercurrent in 2019
Author(s)
Azminuddin, Fuad; Lee, Jae Hak; Jeon, Dong Chull; Shin, Chang Woong; Villanoy, C.; Lee, Seok; Min, Hong Sik; Kim, Dong Guk
KIOST Author(s)
Azminuddin, Fuad(Fuad)Jeon, Dong Chull(전동철)Shin, Chang Woong(신창웅)Lee, Seok(이석)Kim, Dong Guk(김동국)
Alternative Author(s)
Fuad; 전동철; 신창웅; 이석; 민홍식; 김동국
Publication Year
2022-02
Abstract
The northward-flowing Mindanao Undercurrent (MUC) was directly measured by acoustic Doppler current profilers from a subsurface mooring at about 8°N, 127°E during 2 years (November 2017–December 2019). Its depth covers a range from 400 m to deeper than 1,000 m with its core appearing at around 900 m. The mean velocity of MUC's core was approximately 5.8 cm s−1 with a maximum speed of about 47.6 cm s−1. The MUC was observed as a quasi-permanent current with strong intraseasonal variability (ISV) with a period of 70–80 days. Further analyses with an eddy-resolving circulation model output suggest that the ISV is closely related to sub-thermocline eddies (SEs). In this study, two types of SEs near the Philippine coast are disclosed: the westward propagating SE (SE-1) and the quasi-stational SE southeast of Mindanao Island (SE-2). The SE-1 has both cyclonic and anticyclonic polarities with the propagation speed of 7–8 cm s−1, while the SE-2 is an anticyclonic eddy that moves erratically within 4–8°N, 127–130°E with the mean translation speed of about 11 cm s−1. Even though the SE-1 plays an important role in modulating the MUC, our results show that the observed strong MUC event (May–July 2019) is evidently induced by the intensified SE-2 that moves northwestward. This study emphasizes that the SE-2 when intensified, receives more energy from the strengthened New Guinea Coastal Undercurrent and loses the energy northward along the Philippine coast by intensifying the MUC. © 2022. American Geophysical Union. All Rights Reserved.
ISSN
2169-9275
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/42382
DOI
10.1029/2021JC017883
Bibliographic Citation
Journal of Geophysical Research: Oceans, v.127, no.2, 2022
Publisher
John Wiley and Sons Inc
Keywords
Intra-seasonal variability; Mindanao undercurrent; New Guinea Coastal undercurrent; northwest Pacific; sub-thermocline eddy; western boundary currents
Type
Article
Language
English
Document Type
Article
Publisher
John Wiley and Sons Inc
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