Low-frequency variability of the North Equatorial Current bifurcation in the past 40 years from SODA

Meng, Qingjia; Wang, Fan; Liu, Na

doi:10.1007/s13131-011-0114-7

Cited by 10 publications

(10 citation statements)

References 11 publications

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“…The NBL is usually defined as the latitude where the meridional velocity sums to zero within a fixed distance away from the Philippine coast. Different studies have chosen different distances between 2 and 5 longitudinal degrees (Qu and Lukas, ; Meng et al ., ; Qiu and Chen, ). After conducting a sensitivity analysis to confirm that changing this distance between 2 and 5 degrees does not affect our detection of where the NEC bifurcates (results not shown), the latitude where the meridional velocity sums to zero within 3 degrees away from the Philippine coast was chosen to define the NBL in our investigation.…”

Section: Methodsmentioning

confidence: 99%

Variability of the Pacific North Equatorial Current and its implications on Japanese eel (Anguilla japonica) larval migration

Hsu

Xue

Chai

et al. 2016

Fisheries Oceanography

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The zonal velocity produced by a Regional Ocean Modeling System (ROMS)‐based Pacific Ocean circulation model was validated against in situ measurements along the 137°E longitude. The Pacific model successfully reproduced the position and the shape of the North Equatorial Current (NEC) as well as the latitude of maximum surface velocity in the NEC region (8–17°N). The flow field produced by the Pacific model was then used to conduct numerical Lagrangian experiments, in which passive particles were released along a transect (142.5°E, 12.5–17°N) that traverses the known Japanese eel spawning area, and the effects of NEC strength and bifurcation latitude on the particle advection in the northwest Pacific were studied. Our results suggest that, in the 20‐yr period (1993–2012), the variability of the currents alone can cause interannual variability of one order of magnitude in the Kuroshio Entrance (KE), the percentage of particles entering the Kuroshio, the range of which varies from 43% in 1997 to 6% in 2012. The yearly‐averaged KE is not sensitive to the NEC bifurcation latitude. Instead, it is controlled by the average zonal velocity of a fixed domain (125–143°E, 13.5–17°N) and related to a recently‐developed climate index, the Philippines–Taiwan Oscillation (PTO). During the positive phase of the PTO, the zonal velocity in the domain, hence the yearly‐averaged KE, increases, and the opposite is true in the negative phase of the PTO. Considering only the trajectories, diel vertical migrations (DVM) in the top 400 m do not significantly affect Japanese eel larval transport, as incorporating DVM schemes does not increase the KE.

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Section: Methodsmentioning

confidence: 99%

Variability of the Pacific North Equatorial Current and its implications on Japanese eel (Anguilla japonica) larval migration

Hsu

Xue

Chai

et al. 2016

Fisheries Oceanography

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“…It has been proposed that El Niño (La Niña) can cause an anomalous lower-tropospheric anticyclone (cyclone) around the Philippines via Gill-type Rossby wave responses in peak winters [42,43]. Therefore, the East Asian winter monsoon (EAWM) tends to be weak (strong) during El Niño (La Niña) winters, with widespread warming (cooling) and more (less) precipitation observed in subtropical East Asia [44][45][46][47][48][49][50]. Although these climate anomalies are not exactly symmetric, they have broadly opposite signs in El Niño and La Niña winters [51].…”

Section: Discussionmentioning

confidence: 99%

Current Dependent Dispersal Characteristics of Japanese Glass Eel around Taiwan

Hsiung

Lin

Han

2022

JMSE

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Japanese eel larvae are passively transported to the East Asian Continental Shelf by the North Equatorial Current, Kuroshio and Kuroshio intrusion currents, and coastal currents. Previous studies have investigated the dispersal characteristics and pathways of Japanese glass eels. However, there are still limitations in these studies. According to long-term (2010–2020) catch data from the Fisheries Agency in Taiwan, the distribution and time series of glass eels recruitment to Taiwan are closely related to the surrounding ocean currents. Recruitment begins in eastern Taiwan via the mainstream Kuroshio and in southern Taiwan via the Taiwan Strait Warm Current. In central Taiwan, recruitment occurs from southern Taiwan, as well as from mainland China via the southern branch of the China Coast Current (CCC). The latest recruitment occurred in northern Taiwan and mainly comprised glass eels from mainland China via the northern branch of the CCC. A stronger monsoon during the La Niña phase could affect the recruitment time series in northern and eastern Taiwan. This study suggests that the recruitment directionality of glass eels is an indicator of the flow field of ocean/coastal currents and elucidates the dispersal characteristics of glass eels in the waters around Taiwan.

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“…The HYCOM and OFES data came from hindcast products. These reanalyzes are frequently used in the research of NEC [2,3,[11][12][13].…”

Section: Methodsmentioning

confidence: 99%

Assessment of Several Ocean Reanalyzes about North Equatorial Current at 160° E

Wang

Mao

Chen

2020

JMSE

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Three ocean reanalyzes including Simple Ocean Data Assimilation (SODA), Hybrid Coordinate Ocean Model, and the Navy Coupled Ocean Data Assimilation (HYCOM+NCODA) analysis, and the Ocean General Circulation Model for the Earth Simulator (OFES) are assessed about their ability of depicting the structure of North Equatorial Current (NEC) at 160° E. We found that these products could reflect the structure of NEC relatively well at the whole section, but not at the single point through comparing their results with mooring and cruising measurement, and the OFES is the best choice to study mesoscale processes versus the other two reanalyzes through comparing their results with satellite measurement.

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Low-frequency variability of the North Equatorial Current bifurcation in the past 40 years from SODA

Cited by 10 publications

References 11 publications

Variability of the Pacific North Equatorial Current and its implications on Japanese eel (Anguilla japonica) larval migration

Variability of the Pacific North Equatorial Current and its implications on Japanese eel (Anguilla japonica) larval migration

Current Dependent Dispersal Characteristics of Japanese Glass Eel around Taiwan

Assessment of Several Ocean Reanalyzes about North Equatorial Current at 160° E

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