The Influence of Deep Mesoscale Eddies on Sea Surface Temperature in the North Atlantic Subtropical Convergence

Voorhis, Arthur D.; Schroeder, Elizabeth; Leetmaa, Ants

doi:10.1175/1520-0485(1976)006<0953:tiodme>2.0.co;2

Cited by 49 publications

(17 citation statements)

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“…9(c). The process appears to be the same as that suggested by VOORHIS, SCHROEDER and LEETMAA (1976), namely, that cold water is advected southward and warm water is recirculated northward by the mesoscale eddies as they exchange water and properties with the frontal band flow. The pattern at each of the four levels in the upper 500 m layer is similar with respect to latitude in that the flux in the tranquil region south of 33°N is negligible and to the north it becomes measurable.…”

Section: A2f(r) G(r) -supporting

confidence: 62%

“…It is important to note that although the geopotential topography field is less energetic in the eastern basin, the length scales are shorter and the resulting velocities larger. The close approach of high and low disturbances may lead to enhanced frontogenesis as has been suggested by VOORHIS, SCHROEDER and LEETMAA (1976).…”

Section: A2f(r) G(r) -mentioning

confidence: 82%

“…If we take into account that most of the variability along legs 3 and 4 occurred between 36°-30°N, this value may be augmented to 3.0 x 103°C m 3 s -1 km -1. VOORHIS, SCHROEDER and LEETMAA (1976) calculated an eddy temperature transport in the MODE region, centered near 28°N 70°W, of 104 °C m 3 s -~ km -~. This calculation is probably an overestimate since the model assumed a rather large (2°C) temperature difference between northward and southward flows.…”

Section: H Kj~se Etalmentioning

confidence: 99%

“…In their discussion of the large scale structure of sea surface temperature, VOORHIS et al (1976) concluded that surface currents associated with deep baroclinic mesoscale eddies were the primary agents for distorting the observed surface temperature field. Thus one might expect coherence between G.E.K.…”

Section: H Kj~se Etalmentioning

confidence: 99%

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Currents, fronts and eddy fluxes in the Canary Basin

Käse

Zenk

Sanford

et al. 1985

Progress in Oceanography

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-Hydrographic data from two cruises in the Canary Basin (Meteor 57, July 1981; Poseidon 86, April 1982) are analysed with respect to current distribution and lateral heat flux in the Azores-Madeira region.The first part of the data base consists of long transects of XBT and G.E.K. measurements between Cape Finisterre (North West Spain) and the northern Canary Basin, where several year-long current meter records exist. Further information is obtained by thermosalinograph surface data and by expendable current profilers (XCP). Geostrophic currents are derived from XBT profiles, using the tight temperature-salinity relationship in the depth range of the Warmwassersphdre. The results compare well with the G.E.K. and XCP current observations. The second part consists of CTD data from an eddy resolving, box-shaped CTD survey (500 × 500km 2) centered at the mooring location (33°N, 22°W). The observations are supplemented by satellite-buoy trajectories. Horizontal parameter distribution is shown in terms of objectively contoured maps.Bands of spatially enhanced energetic structures, seen in the long transects are further resolved by the box survey as a deep jet-like current system cross the Canary Basin in a westeast direction. Associated with this Azores Current is a frontal zone with near-surface temperature and salinity steps of order 2 K and 0.3 practical salinity units.The dynamic topography field can be decomposed into a linear background field, a Rossby wave and a mesoscale eddy field. We find that major contributions to the meridional eddy heat flux are confined to the vicinity of the Azores current frontal zone. It is shown that the principal balance in the temperature equation is between heating by the mean horizontal advection term s and cooling by the eddy flux divergence.

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Section: A2f(r) G(r) -supporting

confidence: 62%

Section: A2f(r) G(r) -mentioning

confidence: 82%

Section: H Kj~se Etalmentioning

confidence: 99%

Section: H Kj~se Etalmentioning

confidence: 99%

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Currents, fronts and eddy fluxes in the Canary Basin

Käse

Zenk

Sanford

et al. 1985

Progress in Oceanography

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“…The observations, however, reveal the presence in the upper ocean (the "seasonal" thermocline and the near-surface homogeneous layer) of eddies of smaller sizes -with a lateral scale of 5-50 km. Such eddies were reported by POLYGON-70 (Kort, Byshev & Tarasenko 1974) and MODE-l (for instance, Voorhis, Schroeder & Leetmaa 1976), and were found in the California Current [McEwen 1948(! ), Reid, Schwartzlose & Brown 1963], in the northern (Swallow 1971) and the southwestern (Beck erie 1972) parts of the Sargasso Sea, under the ice in the Arctic Basin (Hunkins 1974) and in other parts of the World Ocean.…”

Section: Other Observationsmentioning

confidence: 56%

Synoptic Eddies in the Ocean

Koshlyakov¹,

Monin²

1978

Annu. Rev. Earth Planet. Sci.

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=<10103Synoptic oceanic eddies are defined as nonstationary eddylike disturbances of the oceanic circulation with a horizontal scale of the order of the Rossby internal scale R = NIif-l, wherefis the Conolis parameter, h the thickness of the baroclinic layer in the ocean, and N the average over the baroclinic layer Viiisiila frequency; in the internal parts of the anticyclonic subtropical gyres R is of the order of 50 km. The use of the term "synoptic" instead of the term "mesoscale" emphasizes the physical analogy between the phenomenon under consideration and the synoptic eddies in the atmosphere (cyclones and anticyclones). This analogy can be made on the basis of their similar physical natures (Rossby waves, the determining role for which is played by the Corio lis parameter), the suggested prevailing mechanism of generation (baroclinic instability of large-scale currents), the corresponding horizontal scales (Rossby atmospheric and oceanic scales) and in the quasi-geostrophic character of the motion.The experimental data obtained so far make it possible to subdivide the synoptic occanic eddies into two classes: 1. Frontal eddies that are produced by the cutoff of meanders from such frontal currents as the Gulf Stream and the Kuroshio. 2. Open-ocean eddies that are, as it is understood at the present time, quasi horizontal and quasi-geostrophic waves of the synoptic scale.This review deals primarily with the open-ocean eddies discovered and experimentally studied during the past decade. The fr ontal eddies are considered mainly to elucidate common features and differences between them and the open ocean eddies. The theoretical part of the review is subordinate and deals primarily with the results directly related to experiment. 2 OPEN-OCEAN SYNOPTIC EDDIES 2.1 First Serious Indications The most fundamental contribution to the studies of synoptic eddies of the open ocean has been made by the Soviet POL YGON-70 experiment (Brekhovskikh et al 495 0084-6597/78/0515-0495 $01.00 Annu. Rev. Earth Planet. Sci. 1978.6:495-523. Downloaded from www.annualreviews.org Access provided by University of California -Davis on 02/03/15. For personal use only. Quick links to online content Further ANNUAL REVIEWS

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Oceanography in Underwater Acoustics

Dugan¹

1979

Topics in Current Physics

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The Influence of Deep Mesoscale Eddies on Sea Surface Temperature in the North Atlantic Subtropical Convergence

Cited by 49 publications

References 0 publications

Currents, fronts and eddy fluxes in the Canary Basin

Currents, fronts and eddy fluxes in the Canary Basin

Synoptic Eddies in the Ocean

Oceanography in Underwater Acoustics

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