Antarctic Bottom Water Flux in the Equatorial Western Atlantic*

Hall, Melinda M.; McCartney, Michael S.; Whitehead, J. A.

doi:10.1175/1520-0485(1997)027<1903:abwfit>2.0.co;2

Cited by 76 publications

(77 citation statements)

References 21 publications

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“…All those series reveal low-frequency fluctuations of the zonal velocity component at annual and semiannual periods and higher frequency fluctuations of the meridional velocity component. Our data thus confirm the ubiquitous character of such variability in the equatorial Atlantic Ocean: seasonal variability of the deep currents has been reported at 44°W and 35°W (Fischer and Schott 1997;Hall et al 1997;Brandt and Eden 2005) and between 600 and 1,800 m in the Guinea basin (Weisberg and Horigan 1981) (Fig. 1a).…”

Section: Introductionsupporting

confidence: 90%

Seasonal fluctuations in the deep central equatorial Atlantic Ocean: a data–model comparison

Thierry¹,

Mercier²,

Tréguier³

2006

Ocean Dynamics

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Low-frequency current fluctuations in the deep central equatorial Atlantic are analyzed using current meter measurements recorded from November 1992 to November 1994. Current meters were located at about 14°W of longitude and 1°of latitude on both sides of the equator between 1,700 m depth and the ocean bottom. At all sampling depths, the velocity fluctuations are dominantly zonal and symmetrical with respect to the equator. At 1,700 and 2,000 m, the flow is dominated by annual period fluctuations, at 3,000 m, the velocity field amplitude presents a minimum, and at 3,750 and 3,950 m, the flow is modulated by annual and semiannual period variability. The annual signal exhibits an apparent upward phase propagation. When considering the phase and the amplitude of the seasonal fluctuations, the data compare well with the outputs of a realistic numerical simulation of the Atlantic Ocean. Together with a previous analysis of the model simulations, this supports the idea that the observed annual fluctuations are due to wind-forced vertically propagating Kelvin and Rossby waves. Data and model do not provide deciding evidences of the presence of semiannual equatorial waves deeper than 3,500 m depth in the central equatorial Atlantic Ocean.

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Section: Introductionsupporting

confidence: 90%

Seasonal fluctuations in the deep central equatorial Atlantic Ocean: a data–model comparison

Thierry¹,

Mercier²,

Tréguier³

2006

Ocean Dynamics

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“…The southward DWBC transport across 24.5N was estimated as À26.5 ± 13.5 Sv (Bryden et al, 2005a,b;Johns et al, 2008), not significantly different from recent estimates by Meinen et al (2013Meinen et al ( ) during 2004Meinen et al ( -2009. Hall et al (1997) estimated the AABW northward transport at the Equator as 2 ± 4 Sv, as also used by Ganachaud (2003a) in their global inverse model. This value is consistent with our own estimate from LADCP data for 2010 in the western basin, 1.4 ± 0.5 Sv, with the uncertainty estimated after applying a Monte Carlo method to the LADCP velocity error.…”

Section: Model Constraintsmentioning

confidence: 99%

Meridional overturning transports at 7.5N and 24.5N in the Atlantic Ocean during 1992–93 and 2010–11

Hernández‐Guerra¹,

Pelegrí²,

Fraile-Nuez³

et al. 2014

Progress in Oceanography

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“…Another part flows to the Equatorial Channel and Guyana Basin (Hall et al, 1997) and later splits, propagating to the east through the Vema Fracture Zone and to the northwest to the North American Basin (Morozov et al, 2010a).…”

Section: Introductionmentioning

confidence: 99%

Transport of Antarctic bottom water through the Kane Gap, tropical NE Atlantic Ocean

2013

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Abstract. We study low-frequency properties of the Antarctic Bottom Water (AABW) flow through the Kane Gap (9 • N) in the Atlantic Ocean. The measurements in the Kane Gap include five visits with CTD (Conductivity-TemperatureDepth) sections in 2009-2012 and a year-long record of currents on a mooring using three AquaDopp current meters. We found an alternating regime of flow, which changes direction several times during a year. The seasonal signal seems to dominate. The maximum daily average values of southerly velocities reach 0.20 m s −1 , while the greatest north-northwesterly velocity is as high as 0.15 m s −1 . The velocity and transport at the bottom are aligned along the slope of a local hill near the southwestern side of the gap. The distribution of velocity directions at the upper boundary of AABW is wider. The transport of AABW ( < 1.9 • C) based on the mooring and LADCP (Lowered Acoustic Doppler Current Profiler) data varies approximately within ±0.35 Sv in the northern and southern directions. The annual mean AABW transport through the Kane Gap is almost zero.

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Antarctic Bottom Water Flux in the Equatorial Western Atlantic*

Cited by 76 publications

References 21 publications

Seasonal fluctuations in the deep central equatorial Atlantic Ocean: a data–model comparison

Seasonal fluctuations in the deep central equatorial Atlantic Ocean: a data–model comparison

Meridional overturning transports at 7.5N and 24.5N in the Atlantic Ocean during 1992–93 and 2010–11

Transport of Antarctic bottom water through the Kane Gap, tropical NE Atlantic Ocean

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