Anti‐correlated variability in subduction rate of the western and eastern North Pacific Oceans identified by an eddy‐resolving ocean GCM

Chen, Ju; Qu, Tangdong; Sasaki, Yoshi N.; Schneider, Niklas

doi:10.1029/2010gl045239

Cited by 17 publications

(13 citation statements)

References 38 publications

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“…Gu and Philander (1997) noted that the subduction and propagation of an anomalous subtropical signal can affect the equatorial thermocline via basin-scale circulation. In addition, both the decadal spiciness ) and temperature anomalies (Chen et al 2010) in the eastern subtropical North Pacific were found to migrate southwestward toward the tropical western Pacific. In addition, both the decadal spiciness ) and temperature anomalies (Chen et al 2010) in the eastern subtropical North Pacific were found to migrate southwestward toward the tropical western Pacific.…”

Section: Discussionmentioning

confidence: 95%

Imprint of the Pacific Decadal Oscillation on the South China Sea Throughflow Variability*

2013

Journal of Climate

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Analysis of the 62-yr hindcast outputs from an eddy-resolving ocean general circulation model reveals a prominent decadal variability in the upper-layer (0-745 m) Luzon Strait transport (LST), a key component of the South China Sea throughflow. This variability is in phase with the basin-scale wind stress anomalies associated with the Pacific decadal oscillation (PDO). A composite analysis shows that during the positive phase of the PDO, the Aleutian low and its related positive wind stress curl anomalies intrude southward, reducing the trade winds and enhancing the westerly wind anomalies in the tropical North Pacific. In response, the North Equatorial Current bifurcation shifts northward, resulting in a weaker Kuroshio east of Luzon and consequently a stronger South China Sea throughflow in the upper 745 m.

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Section: Discussionmentioning

confidence: 95%

Imprint of the Pacific Decadal Oscillation on the South China Sea Throughflow Variability*

2013

Journal of Climate

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“…More recently in Qu and Chen (2009), a zero lag correlation between the North Pacific subduction rate and the PDO index has been identified consistent with our findings. It is also reported that this correlation is caused by the surface wind and heat flux influencing the winter mixed layer (Qu and Chen 2009;Chen et al 2010). Additionally, the role of the surface heat flux and large-scale wind stress patterns on the formation of North Pacific mode waters in a warmer climate has also been studied (Luo et al 2009); less mode water is formed owing to a more stratified ocean.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Numerical Investigations of Seasonal and Interannual Variability of North Pacific Subtropical Mode Water and Its Implications for Pacific Climate Variability

et al. 2011

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North Pacific Subtropical Mode Water (NPSTMW) is an essential feature of the North Pacific subtropical gyre imparting significant influence on regional SST evolution on seasonal and longer time scales and, as such, is an important component of basin-scale North Pacific climate variability. This study examines the seasonalto-interannual variability of NPSTMW, the physical processes responsible for this variability, and the connections between NPSTMW and basin-scale climate signals using an eddy-permitting 1979-2006 ocean simulation made available by the Estimating the Circulation and Climate of the Ocean, Phase II (ECCO2). The monthly mean seasonal cycle of NPSTMW in the simulation exhibits three distinct phases: (i) formation during November-March, (ii) isolation during March-June, and (iii) dissipation during June-Novembereach corresponding to significant changes in upper-ocean structure. An interannual signal is also evident in NPSTMW volume and other characteristic properties with volume minima occurring in 1979, 1988, and 1999. This volume variability is correlated with the Pacific decadal oscillation (PDO) with zero time lag. Further analyses demonstrate the connection of NPSTMW to the basin-scale ocean circulation. With this, modulations of upper-ocean structure driven by the varying strength and position of the westerlies as well as the regional airsea heat flux pattern are seen to contribute to the variability of NPSTMW volume on interannual time scales.

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“…The OFES outputs have been analyzed in numerous earlier studies (Aoki et al 2007;Chen et al 2010;Chiang and Qu 2013;Qu et al 2012). The results have demonstrated the promising capability of the model in representing realistic variability of different spatial and temporal scales in the ocean, including western boundary currents, mesoscale eddy generation near strong current systems, as well as appropriate water masses in the world's ocean.…”

Section: Model and Datasetsmentioning

confidence: 99%

Study of subsurface eddy properties in northwestern Pacific Ocean based on an eddy-resolving OGCM

Nan

2019

Ocean Dynamics

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A method based on the Okubo-Weiss parameter was used to detect subsurface eddies (SSEs) with an eddy-resolving ocean general circulation model. Statistical analyses showed that SSEs are ubiquitous in the northwestern Pacific Ocean. Three regions were found to have high probability of SSE, which are as follows: the latitudinal band between 9°N and 17°N, the Kuroshio extension region, and the area east of the Ryukyu Islands. Although surface eddies (SEs) were found distributed widely within the zonal band of the Subtropical Counter Current, few SSEs were found there. In contrast, few SEs were found to the east of The Philippines, whereas SSEs were abundant. The kinetic energy contained within SSE was found comparable in magnitude with that of SE. During 1993, about 2569 and 2099 SSEs (at a depth of about 400 m) were observed to be anticyclonic and cyclonic, respectively; thus, SSEs tended to be anticyclonic. The mean radius, lifespan, and propagation speed of SSE in this study were about 60 km, 50 days, and 6.6 cm/s, respectively. The propagation speed showed a wave-like decrease with increasing latitude. Some long-lived SSEs were found to persist for longer than 4 months and to move thousands of kilometers. About 89% of SSEs were nonlinear for at least half their lifespan, which implies that SSE can trap interior fluid during translation. Trajectories revealed that SSEs propagate nearly due west with only small meridional deflection. The findings of this study will contribute to the enrichment of our knowledge regarding SSE in the northwestern Pacific Ocean.

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Anti‐correlated variability in subduction rate of the western and eastern North Pacific Oceans identified by an eddy‐resolving ocean GCM

Cited by 17 publications

References 38 publications

Imprint of the Pacific Decadal Oscillation on the South China Sea Throughflow Variability*

Imprint of the Pacific Decadal Oscillation on the South China Sea Throughflow Variability*

Numerical Investigations of Seasonal and Interannual Variability of North Pacific Subtropical Mode Water and Its Implications for Pacific Climate Variability

Study of subsurface eddy properties in northwestern Pacific Ocean based on an eddy-resolving OGCM

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