Eddy analysis in the subtropical zonal band of the North Pacific Ocean

Liu, Yu; Dong, Changming; Guan, Yisheng; Chen, Dake; McWilliams, James C.; Nencioli, Francesco

doi:10.1016/j.dsr.2012.06.001

Cited by 162 publications

(170 citation statements)

References 39 publications

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“…The mean life cycle of an eddy consists of a growth and decaying phase, both lasting about 20% of its lifetime and a stable phase in between (Liu et al, 2012;Frenger et al, 2015;Samelson et al, 2014), which is not consistent with our observations showing Rossby numbers of less than 0.1 for ACE1 and ACE2 reflecting a stable phase over 90 % of the lifetime of the eddies. In contrast to this, MWE and CE show a longer growing phase of 30 % and also a longer decaying phase of 40 %, where the stable phase 10 with a Rossby number of less than 0.1 remains short.…”

Section: The Development Of Further Eddy Properties (Radius [Km] Rotcontrasting

confidence: 56%

Impact of mesoscale eddies on water mass and oxygen distribution in the eastern tropical South Pacific

Czeschel

Schütte

Weller

et al. 2018

Preprint

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Section: The Development Of Further Eddy Properties (Radius [Km] Rotcontrasting

confidence: 56%

Impact of mesoscale eddies on water mass and oxygen distribution in the eastern tropical South Pacific

Czeschel

Schütte

Weller

et al. 2018

Preprint

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“…A global eddy data set is derived from the AVISO data using this method; it is available online 15 . Eddy statistical and dynamical characteristics in the subtropic frontal zone of the Northern Pacific Ocean were previously analysed based on this eddy data set 10 .…”

Section: Resultsmentioning

confidence: 99%

“…An eddy detection scheme based on velocity geometry has successfully been applied to data from a model 13 to SSHA-derived geostrophic velocity anomalies 10 and to SST-derived thermal wind velocity 11 . In a reference frame moving with the local mean velocity, an eddy is defined as a horizontal flow feature where the relative velocity vectors rotate around a centre.…”

Section: Methodsmentioning

confidence: 99%

“…If information is available about eddy location and movement, and the associated T/S anomalies, then eddy heat and salt transport can be estimated by assuming that the compensating currents outside the eddies do not have correlated T/S anomalies on average. Automated eddy detection schemes have been applied to data sets from different surface observations [9][10][11] . They can be combined with the accumulating data sets on T/S vertical profiles from Argo profiling floats to directly estimate the heat and salt transport due to eddy movement.…”

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confidence: 99%

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Global heat and salt transports by eddy movement

et al. 2014

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Oceanic mesoscale eddies contribute important horizontal heat and salt transports on a global scale. Here we show that eddy transports are mainly due to individual eddy movements. Theoretical and observational analyses indicate that cyclonic and anticyclonic eddies move westwards, and they also move polewards and equatorwards, respectively, owing to the b of Earth's rotation. Temperature and salinity (T/S) anomalies inside individual eddies tend to move with eddies because of advective trapping of interior water parcels, so eddy movement causes heat and salt transports. Satellite altimeter sea surface height anomaly data are used to track individual eddies, and vertical profiles from co-located Argo floats are used to calculate T/S anomalies. The estimated meridional heat transport by eddy movement is similar in magnitude and spatial structure to previously published eddy covariance estimates from models, and the eddy heat and salt transports both are a sizeable fraction of their respective total transports.

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“…After a few sensitivity tests in comparison with the results of the OW method and following the instructions of Nencioli et al (2010), we set a = 3 and b = 2. Optimal results were obtained when we linearly interpolated the AVISO velocity fields onto a 1/6 • ×1/6 • grid before we applied the algorithm (for more information see also Liu et al, 2012). If an eddy is detected, then an eddy center is identified in analogy to the OW method as the maximum (anticyclone) or the minimum (cyclone) of SLA within the identified eddy structure.…”

Section: Eddy Identification and Tracking From Satellite Datamentioning

confidence: 99%

Occurrence and characteristics of mesoscale eddies in the tropical northeastern Atlantic Ocean

2016

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Abstract. Coherent mesoscale features (referred to here as eddies) in the tropical northeastern Atlantic Ocean (between 12-22 • N and 15-26 • W) are examined and characterized. The eddies' surface signatures are investigated using 19 years of satellite-derived sea level anomaly (SLA) data. Two automated detection methods are applied, the geometrical method based on closed streamlines around eddy cores, and the Okubo-Weiß method based on the relation between vorticity and strain. Both methods give similar results. Mean eddy surface signatures of SLA, sea surface temperature (SST) and sea surface salinity (SSS) anomalies are obtained from composites of all snapshots around identified eddy cores. Anticyclones/cyclones are identified by an elevation/depression of SLA and enhanced/reduced SST and SSS in their cores. However, about 20 % of all anticyclonically rotating eddies show reduced SST and reduced SSS instead. These kind of eddies are classified as anticyclonic mode-water eddies (ACMEs). About 146 ± 4 eddies per year with a minimum lifetime of 7 days are identified (52 % cyclones, 39 % anticyclones, 9 % ACMEs) with rather similar mean radii of about 56 ± 12 km. Based on concurrent in situ temperature and salinity profiles (from Argo float, shipboard, and mooring data) taken inside of eddies, distinct mean vertical structures of the three eddy types are determined. Most eddies are generated preferentially in boreal summer and along the West African coast at three distinct coastal headland regions and carry South Atlantic Central Water supplied by the northward flow within the Mauretanian coastal current system. Westward eddy propagation (on average about 3.00 ± 2.15 km d −1 ) is confined to distinct zonal corridors with a small meridional deflection dependent on the eddy type (anticyclones -equatorward, cyclones -poleward, ACMEs -no deflection). Heat and salt fluxes out of the coastal region and across the Cape Verde Frontal Zone, which separates the shadow zone from the ventilated subtropical gyre, are calculated.

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Eddy analysis in the subtropical zonal band of the North Pacific Ocean

Cited by 162 publications

References 39 publications

Impact of mesoscale eddies on water mass and oxygen distribution in the eastern tropical South Pacific

Impact of mesoscale eddies on water mass and oxygen distribution in the eastern tropical South Pacific

Global heat and salt transports by eddy movement

Occurrence and characteristics of mesoscale eddies in the tropical northeastern Atlantic Ocean

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