The Vertical Structure of Eddy Heat Transport Simulated by an Eddy-Resolving OGCM

Yim, Bo Young; Noh, Yign; Qiu, Bo; You, Sung Hyup; Yoon, Jong Hwan

doi:10.1175/2009jpo4243.1

Cited by 19 publications

(14 citation statements)

References 30 publications

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“…The former, however, cannot be the case because the southward eddy heat transport does occur even in the same definition as they adopted in which the eddy is defined as an anomaly from temporal mean over the period (not shown). Given that the North Pacific model with 1 /128 resolution simulates southward eddy heat transport for the Kuroshio Extension by Yim et al (2010; Fig. 2 in their paper), the occurrence of the southward eddy heat transport could be because of an increased resolution of the model.…”

Section: Summary and Discussionmentioning

confidence: 93%

“…2). Although similar southward eddy heat transport was predicted by Yim et al (2010) using a highresolution North Pacific model ( Fig. 2 in their paper), they did not examine the cause of this phenomenon.…”

Section: A Horizontal and Vertical Distributions Of Eddy Heat Transportmentioning

confidence: 86%

“…Jayne and Marotzke (2002) showed that meridional eddy heat transport in mid-and high-latitude regions is strong in the neighborhood of the WBCs and the Antarctic Circumpolar Current (ACC). The OGCMs used in previous studies were, however, either coarse-resolution global models (Jayne and Marotzke 2002;Meijers et al 2007;Volkov et al 2008) or higher-resolution models such as a 1 /108 model for the Atlantic (Smith et al 2000) or a 1 /128 model for the North Pacific (Yim et al 2010). No global estimation of eddy heat transport has yet been conducted using a high-resolution OGCM, and thus it is difficult to compare the characteristics and mechanisms of eddy heat transport across basins.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Southward Eddy Heat Transport Occurring along Southern Flanks of the Kuroshio Extension and the Gulf Stream in a 1/10° Global Ocean General Circulation Model

Aoki

Minobe

Tanimoto

et al. 2013

Journal of Physical Oceanography

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The present study investigates meridional heat transport induced by oceanic mesoscale variability in the World Ocean using a 1 /108 global ocean general circulation model (OGCM) running on the Earth Simulator.The results indicate prominent poleward eddy heat transport around the western boundary currents and the Antarctic Circumpolar Current, and equatorward eddy heat transport in the equatorial region, consistent with the previous studies using coarse-resolution OGCMs. Such poleward eddy heat transport in midlatitude oceans suggests that the eddies act to reduce meridional background temperature gradients across the currents, as would be expected based on baroclinic instability. Interestingly, however, along the southern flanks of the eastward jets of the Kuroshio Extension and the Gulf Stream, southward eddy heat transport occurs in subsurface layers. This is likely due to the southward migration of warm water cores originating from southern areas adjacent to these currents. Southward movement of these cores is caused by interactions with unsteady meanders and cold eddies detaching from the meanders. The potential impact on biological production in the subtropical surface layers of these southward-traveling warm water cores is also discussed.

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Section: Summary and Discussionmentioning

confidence: 93%

Section: A Horizontal and Vertical Distributions Of Eddy Heat Transportmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

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Southward Eddy Heat Transport Occurring along Southern Flanks of the Kuroshio Extension and the Gulf Stream in a 1/10° Global Ocean General Circulation Model

Aoki

Minobe

Tanimoto

et al. 2013

Journal of Physical Oceanography

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“…The KE area has strong eddy transport (Wunsch, 1999;Jayne and Marotzke, 2002;Qiu and Chen, 2005;Yim et al, 2010), so parameterizing this transport in the models via a suitable K is necessary to obtain reliable simulation results in this region. To validate our modifi ed K , we computed meridional eddy heat transport (EHT) through EHT T K y     , as discussed by Stammer (1998 very close to other independent estimates calculated from either models or observations (Table 1 contains details).…”

Section: Modified Eddy Diffusivitymentioning

confidence: 99%

A modified method to estimate eddy diffusivity in the North Pacific using altimeter eddy statistics

Zhang

Tian

2013

Chin. J. Ocean. Limnol.

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The method proposed by Stammer (1998) is modifi ed using eddy statistics from altimeter observation to obtain more realistic eddy diffusivity ( K ) for the North Pacifi c. Compared with original estimates, the modifi ed K has remarkably reduced values in the Kuroshio Extension (KE) and North Equatorial Counter Current (NECC) regions, but slightly enhanced values in the Subtropical Counter Current (STCC) region. In strong eastward fl ow areas like the KE and NECC, owing to a large difference between mean fl ow velocity and propagation velocity of mesoscale eddies, tracers inside the mesoscale eddies are transported outside rapidly by advection, and mixing length L is hence strongly suppressed. The low eddy probability ( P ) is also responsible for the reduced K in the NECC area. In the STCC region, however, L is mildly suppressed and P is very high, so K there is enhanced. The zonally-averaged K has two peaks with comparable magnitudes, in the latitude bands of the STCC and KE. In the core of KE, because of the reduced values of P and L , the zonally-averaged K is a minimum. Zonally-integrated eddy heat transport in the KE band, calculated based on the modifi ed K , is much closer to the results of previous independent research, indicating the robustness of our modifi ed K . The map of modifi ed K provides useful information for modeling studies in the North Pacifi c.

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“…The KE region is one of the most energetic regions in the world ocean along with the Gulf Stream and the Antarctic Circumpolar Current regions (e.g., Wyrtki et al 1976;Shum et al 1990;Ducet et al 2000). This strong eddy activity is accompanied by large transports of water properties, such as momentum, heat and nutrient (e.g., Stammer 1998;Qiu and Chen 2005a;Rainville et al 2007;Sasai et al 2010;Yim et al 2010;Aoki et al 2013). The strong eddy activity in the KE region is mainly owing to perturbations of the KE jet (i.e.…”

Section: Introductionmentioning

confidence: 99%

Climatological mean features and interannual to decadal variability of ring formations in the Kuroshio Extension region

Sasaki

Minobe

2016

“Hot Spots” in the Climate System

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This study examines the climatological mean features of oceanic rings shed from the Kuroshio Extension (KE) jet and their interannual to decadal variability using satellite altimeter observations from October 1992 to December 2010. To objectively capture a ring shedding from the KE jet, a new method that consists of the detection of the jet length changes and the tracking of a ring is proposed. A spatial distribution of the ring formations in the KE region indicates that cyclonic (cold-core) rings were most frequently formed in the upstream region between 143°-147°E around the steady meander of the KE jet. In contrast, most of anticyclonic (warm-core) rings formed in the downstream region west of the Shatsky Rise. These pinched-off rings in both the upstream and downstream regions generally propagated westward, but about two-third of the rings was reabsorbed by the jet. Nevertheless, about one-fourth of the meridional eddy heat transport at the latitude of the KE resulted from the rings that are not reabsorbed by the jet. The number of ring formations showed substantial interannual to decadal variability. In the upstream and downstream KE region, decadal and interannual variability was dominant, respectively. These fluctuations of the ring formations were negatively correlated with the strength of the KE jet. It is also revealed that the ring formation variations play an important role in sea surface temperature changes north of the KE jet.

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The Vertical Structure of Eddy Heat Transport Simulated by an Eddy-Resolving OGCM

Cited by 19 publications

References 30 publications

Southward Eddy Heat Transport Occurring along Southern Flanks of the Kuroshio Extension and the Gulf Stream in a 1/10° Global Ocean General Circulation Model

Southward Eddy Heat Transport Occurring along Southern Flanks of the Kuroshio Extension and the Gulf Stream in a 1/10° Global Ocean General Circulation Model

A modified method to estimate eddy diffusivity in the North Pacific using altimeter eddy statistics

Climatological mean features and interannual to decadal variability of ring formations in the Kuroshio Extension region

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