Variability and Dynamics of the Kuroshio and Mindanao Current during the 2010/11 La Niña and in Late 2012

Li, Bo; Yuan, Dongliang; Hu, Xiaoyue; Yang, Ya; Li, Yao; Hu, Shijian

doi:10.1175/JPO-D-23-0124.1

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Variability and Dynamics of the Kuroshio and Mindanao Current during the 2010/11 La Niña and in Late 2012

2024
By Li, Bo ; Yuan, Dongliang ; Hu, Xiaoyue ; ...
Source: Journal of Physical Oceanography, 54(7), 1431-1448

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Journal Title:

Journal of Physical Oceanography
Personal Author:

Li, Bo ; Yuan, Dongliang ; Hu, Xiaoyue ; Yang, Ya ; Li, Yao ; ... More +

Li, Bo ; Yuan, Dongliang ; Hu, Xiaoyue ; Yang, Ya ; Li, Yao ; Hu, Shijian Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; AOML (Atlantic Oceanographic and Meteorological Laboratory) ; CIMAS (Cooperative Institute for Marine and Atmospheric Studies)

OAR (Oceanic and Atmospheric Research) ; AOML (Atlantic Oceanographic and Meteorological Laboratory) ; CIMAS (Cooperative Institute for Marine and Atmospheric Studies) Less -
Description:

Variability of two Pacific western boundary currents (WBCs)—the Kuroshio and the Mindanao Current—during the strong 2010/11 La Niña event is investigated using ship-based hydrographic observations and moored current-meter data collected off the east coasts of the Philippines. The geostrophic currents calculated using the hydrographic data show that, during the 2010/11 La Niña winter, the Kuroshio decreased by ∼10 Sv (1 Sv ≡ 106 m3 s−1), whereas the Mindanao Current increased by ∼5–10 Sv, relative to the normal winter in late 2012. The interannual variability based on the hydrographic data is confirmed by moored current-meter measurements and satellite altimeter geostrophic currents. A coastally trapped Kelvin wave model is used to explain the interannual variability of the two WBCs during the different ENSO phases. The good comparison of the simulated sea level anomalies around the Philippines with the altimeter data suggests that the interannual variability of the WBCs is associated with Kelvin wave propagation from the Sulawesi–Sulu Seas clockwise around the Philippine Archipelago. We identified that the Kelvin waves are excited by downwelling equatorial Rossby waves propagating into the Indonesian Seas during the La Niña. The transport anomalies of the WBCs are comparable to the total meridional transport anomalies integrated across the interior North Pacific Ocean, suggesting the importance of the WBCs in the heat charge–discharge processes of the western Pacific warm pool during ENSO events.ipelago. The result is important for the warm pool dynamics during ENSO.
Source:

Journal of Physical Oceanography, 54(7), 1431-1448
DOI:

https://doi.org/10.1175/JPO-D-23-0124.1
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0022-3670;1520-0485;
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American Meteorological Society
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Journal Article
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urn:sha-512:0d0668600e3e82fa4c82799ceaf3e80eb56acbcc65bea48bebff4c90c70c8eb6b906cdd77fd3e6a28053f5e50d4e3b175ed6339c93122e886a4ff3a957b0f09e
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Variability and Dynamics of the Kuroshio and Mindanao Current during the 2010/11 La Niña and in Late 2012

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