Inter-ocean fluxes south of Africa in an eddy-permitting model

Reason, C. J. C.; Lütjeharms, J. R. E.; Hermes, Juliet; Biastoch, Arne; Roman, Raymond

doi:10.1016/s0967-0645(02)00385-5

Cited by 28 publications

(23 citation statements)

References 137 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, most studies report an estimate of 11-17 Sv. These estimates are based on different methods, such as water mass analysis (Gordon et al, 1992), altimetry (Garzoli and Goni, 2000), Eulerian model fluxes (Reason et al, 2003), numerical Lagrangian floats (Doglioli et al, 2006;Biastoch et al, 2008b), or drifting buoy trajectories (Richardson, 2007). However, none of these studies provide an estimate of the (interannual) variability of Agulhas leakage as the time series obtained in these measurement campaigns or model runs is generally too short to yield higher order statistics.…”

Section: Measuring the Lagrangian Agulhas Leakage Transportmentioning

confidence: 99%

“…The bulk of this flux is recirculated in the subtropical gyre of the Indian Ocean, and only an estimated 5-15 Sv gets into the Atlantic Ocean as Agulhas leakage (Gordon et al, 1992;De Ruijter et al, 1999;Reason et al, 2003). Agulhas leakage is defined here as the water that is transported in the Agulhas Current and flows from the Indian Ocean into the Atlantic Ocean.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Relating Agulhas leakage to the Agulhas Current retroflection location

et al. 2009

Self Cite

View full text Add to dashboard Cite

Abstract. The relation between the Agulhas Current retroflection location and the magnitude of Agulhas leakage, the transport of water from the Indian to the Atlantic Ocean, is investigated in a high-resolution numerical ocean model. Sudden eastward retreats of the Agulhas Current retroflection loop are linearly related to the shedding of Agulhas rings, where larger retreats generate larger rings. Using numerical Lagrangian floats a 37 year time series of the magnitude of Agulhas leakage in the model is constructed. The time series exhibits large amounts of variability, both on weekly and annual time scales. A linear relation is found between the magnitude of Agulhas leakage and the location of the Agulhas Current retroflection, both binned to three month averages. In the relation, a more westward location of the Agulhas Current retroflection corresponds to an increased transport from the Indian Ocean to the Atlantic Ocean. When this relation is used in a linear regression and applied to almost 20 years of altimetry data, it yields a best estimate of the mean magnitude of Agulhas leakage of 13.2 Sv. The early retroflection of 2000, when Agulhas leakage was probably halved, can be identified using the regression.

show abstract

Section: Measuring the Lagrangian Agulhas Leakage Transportmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Relating Agulhas leakage to the Agulhas Current retroflection location

et al. 2009

Self Cite

View full text Add to dashboard Cite

show abstract

“…The model was forced by ECMWF winds and used data from an OGCM for its lateral boundary conditions. From this simulation, Reason et al (2003) derived a heat export into the Southern Atlantic at 20°E of 1 PW in winter and 0.7 PW in summer.…”

Section: Speich Et Al (2004) Have Especially Designed a Model To Expmentioning

confidence: 99%

4 Large scale physical variability of the Benguela Current Large Marine Ecosystem (BCLME)

Shillington¹,

Reason²,

Rae³

et al. 2006

Benguela - Predicting a Large Marine Ecosystem

Self Cite

View full text Add to dashboard Cite

“…The Agulhas Current clearly shows seasonal changes with strong flow in southern hemisphere summer and slightly weakened in winter. Considerable variability has been reported in the Agulhas Current (Ffield et al 1997;Matano et al 2002;Reason et al 2003). The Agulhas Current region and its sources are highly variable on eddy, seasonal and interannual time scales.…”

Section: Southwest Indian Oceanmentioning

confidence: 99%

“…From year-long current measurements of the Agulhas Current, the mean transport is obtained as 70 Sv (Beal and Bryden 1999). Modelling studies (Biastoch et al 1999;Reason et al 2003) suggest that seasonal anomaly in the tropical circulation propagates poleward through the Mozambique Channel and influences the mass transport of the Agulhas Current.…”

Section: Introductionmentioning

confidence: 99%

Mean and Seasonal Circulation of the South Indian Ocean Estimated by Combining Satellite Altimetry and Surface Drifter Observations

Benny¹,

Ambe²,

Mridula³

et al. 2014

Terr. Atmos. Ocean. Sci.

View full text Add to dashboard Cite

The mean velocity field of south Indian Ocean has been derived by combining high resolution maps of sea level anomalies and the surface drifter data from the Global Drifter program from 1993 to 2012 with a resolution of 1/3 × 1/3 degrees in latitude and longitude. The estimated mean velocity field exhibits strong western boundary currents, zonal currents and eastern boundary currents. The Agulhas Current shows a velocity of above 1.5 m s -1 at around 35°S. The distribution of energy associated with the fluctuating motion and the mean flow illustrates that mesoscale variability are particularly relevant in the Mozambique Channel, south of Java and around 40°S. Advection of mesoscale features along the western boundary is evident in the distribution of eddy fluxes. The long-term average monthly surface velocity field exhibits large variations in surface currents. The most change is observed in the South Equatorial Current which shows spatial and temporal variations.Key words: South Indian Ocean, Circulation, Currents, Satellite altimetry, Surface drifter Citation: Benny, N. P., D. Ambe, K. R. Mridula, S. Ses, K. M. Omar, and M. R. Mahmud, 2014: Mean and seasonal circulation of the South Indian Ocean estimated by combining satellite altimetry and surface drifter observations. Terr. Atmos. Ocean. Sci., 25, 91-106, doi: 10.3319/TAO.2013.08.05.01(Oc)

show abstract

Inter-ocean fluxes south of Africa in an eddy-permitting model

Cited by 28 publications

References 137 publications

Relating Agulhas leakage to the Agulhas Current retroflection location

Relating Agulhas leakage to the Agulhas Current retroflection location

4 Large scale physical variability of the Benguela Current Large Marine Ecosystem (BCLME)

Mean and Seasonal Circulation of the South Indian Ocean Estimated by Combining Satellite Altimetry and Surface Drifter Observations

Contact Info

Product

Resources

About