Patterns of Vertical Velocity Induced by Eddy Distortion in an Ocean Model

Pilo, Gabriela S.; Oke, Peter R.; Coleman, Richard; Rykova, Tatiana; Ridgway, K. R.

doi:10.1002/2017jc013298

Cited by 30 publications

(26 citation statements)

References 66 publications

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“…Meanwhile, we found that the near‐surface CHL concentrations are also influenced by the displacement of SCML, and they are enhanced (reduced) when SCMLs move upward (downward), regardless of eddy types and eddy locations (Figures b and c and Figure S5). Several modeling studies (e.g., Pilo et al, ; Zhang et al, ) suggest that vertical advection might be the dominant factor to induce displacement of seawater within eddies. Changes in stratification and relative vorticity in eddy interior constrained by conservation of potential vorticity, divergence of horizontal flow constrained by continuity, and eddy‐wind interaction‐induced Ekman pumping are very likely responsible.…”

Section: Resultsmentioning

confidence: 99%

Observational Evidence of Subsurface Chlorophyll Response to Mesoscale Eddies in the North Pacific

Huang

2018

Geophysical Research Letters

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Ocean eddies were widely reported to strongly impact near‐surface chlorophyll (CHL), but most of previous studies are confined to the ocean surface. Based on large‐scale historical cruise observations with ocean mesoscale eddies detected by altimeters in the North Pacific, we show that the depth‐integrated nitrate and chlorophyll anomalies in the euphotic layer of eddies are less than ±90% for nitrate and ±10% for chlorophyll. These eddy‐driven variations decline from ocean boundaries to the open ocean, due to a combination effect of eddy activity and subsurface nitrate distribution. In the oligotrophic Pacific, CHL anomalies in both cyclonic eddies and anticyclonic eddies negatively correlate with near sea surface temperature anomalies. In contrast, an opposite correlation occurs beneath the subsurface chlorophyll maximum layer (SCML). The integrated CHL results and CHL variability at each sampling depth suggest that the vertical displacement of SCML plays an important role in the near‐surface CHL response to eddies.

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Section: Resultsmentioning

confidence: 99%

Observational Evidence of Subsurface Chlorophyll Response to Mesoscale Eddies in the North Pacific

Huang

2018

Geophysical Research Letters

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“…Although recent numerical studies have reported that the dipole pattern of the vertical velocity arises in mesoscale eddies, similar to the patterns shown in Figures 8A,B, adiabatic up-and downwelling do not necessarily occur on the western and eastern side, respectively, of an anticyclone. Their orientation with respect to an eddy depends on how the eddy is detached from a main current (Pilo et al, 2018), and how the Q-vector distributes (Estrada-Allis et al, 2018). Before an anticyclonic ring is detached from the anticyclonic meander of the KE, the upwelling and the downwelling are seen from the meander trough to the crest, and from the crest to the trough, respectively (Bower and Rossby, 1989).…”

Section: Discussionmentioning

confidence: 99%

Mesoscale Warm-Core Eddies Drive Interannual Modulations of Swordfish Catch in the Kuroshio Extension System

2020

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Recent observational and numerical studies have suggested that the decadal modulation of the Kuroshio Extension system, driven by mesoscale eddies, profoundly affect the basin scale physical and biogeochemical oceanography. However, it remains unclear how these decadal changes affect distribution and abundance of fish species in this region. In this study, 26,964 swordfish catch data obtained by longliners during 2004-2010 in the western North Pacific are analyzed with an eddy-resolving ocean reanalysis by using mesoscale dynamic parameters and an eddy detection technique, to clarify the effects of mesoscale eddies and their variabilities on the swordfish relative abundance. During this period, the Kuroshio Extension underwent two different dynamic phases: stable path state in 2004, 2005, and 2010; and unstable path state during 2006-2009. Based on our analyses, we show here that swordfish are more concentrated in and near the anticyclonic warm-core eddies in the northern site, 36-45 • N, of the Kuroshio Extension system, especially during the unstable path phase. This is found to be caused by the interannual modulation of mesoscale eddy activities due to more warm-core rings generated from the unstable Kuroshio Extension, making it easier for fishermen to target swordfish in this region.

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“…The eddies we examine are embedded within a dynamic mean flow, and among other mesoscale eddies with which they interact (Pilo et al, ). As a consequence, eddies are in constant change, and predictions of the time they retain water parcels from mean eddy characteristics (e.g., radius, vorticity, and depth extent) are not robust.…”

Section: Discussionmentioning

confidence: 99%

Retention and Leakage of Water by Mesoscale Eddies in the East Australian Current System

et al. 2019

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Mesoscale eddies are ubiquitous in the ocean, transporting semi‐isolated water masses as well as advecting tracers and biota. The extent to which eddies impact the environment depends on the time they retain water parcels. Here we quantify retention times of mesoscale eddies in a (1/10)° model of the East Australian Current and its extension along the southeast coast of Australia. We find that retention times vary widely, between 3 and 357 days, but peak around 24 and 27 days for anticyclones and cyclones, respectively. Changes in eddy shape, though not in eddy size, relate to water exchange between the eddy and the background flow. An increase in eccentricity (eddy elongation) often leads to water leakage, while a decrease is associated with water retention. Thus, the change in eddy eccentricity can be used as a diagnostic of the eddy's likelihood to exchange water with its surrounding. We find that water within a region of the eddy that is close to uniform rotation and rotating faster than uniform vorticity is more likely to be retained. Typical retention times are long enough for eddies to transport water across regions of contrasting hydrographic properties, develop a biogeochemical response, and influence connectivity patterns.

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Patterns of Vertical Velocity Induced by Eddy Distortion in an Ocean Model

Cited by 30 publications

References 66 publications

Observational Evidence of Subsurface Chlorophyll Response to Mesoscale Eddies in the North Pacific

Observational Evidence of Subsurface Chlorophyll Response to Mesoscale Eddies in the North Pacific

Mesoscale Warm-Core Eddies Drive Interannual Modulations of Swordfish Catch in the Kuroshio Extension System

Retention and Leakage of Water by Mesoscale Eddies in the East Australian Current System

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