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- W652454621 abstract "The South African Gateway is a critical region for the water mass exchangebetween the Atlantic and the Indian Ocean. The variability in the interoceanicexchange is relevant to global climate change.High resolution seismic reflection data were collected in the Transkei Basinduring R/V SONNE cruise SO–182 in 2005. These seismic observations haveindicated that a large elongate mounded contourite drift, the Agulhas Drift, hasbeen built up by eastward flows of Antarctic Bottom Water (AABW) and NorthAtlantic Deep Water (NADW) since about 3 Ma.For a better understanding of the influences of the various currents on sedimenttransport patterns in the vicinity of the Agulhas Drift, the Regional OceanicModeling System (ROMS) has been used to simulate the current system andsuspended sediment transport processes.The results from current system simulation showed that a recurrent individualcyclonic eddy event is the key hydrodynamic feature in the Transkei Basin.These eddies are almost fixed in the center of the Transkei Basin and spread overthe entire water column. Flow in their northern segments is eastward across thesouthern flank of the Agulhas Drift. These eddies are supposedly the result ofperturbations in the Subtropical Convergence (STC) in the region of south ofAfrica, where planetary waves on the STC deform. The perturbations enhancethe surface eddy kinetic energy (EKE) in the Transkei Basin. The high EKE isthen transferred from the surface to the deep ocean, where it causes the formationof eddies at abyssal depth.Based on the ocean circulation simulations, grain size experiments were carriedout to test the transport behaviors for 4 different silt grain size classes. Oursimulations reveal that sediment transport patterns in the Transkei Basin arestrongly influenced by the mesoscale eddies. During eddy events, silts at all testedgrain sizes can be resuspended by the AABW along the northeastern flank of theAgulhas Plateau that borders the Transkei Bsin to the east, whereas not all ofthem can be further transported into the region of the Agulhas Drift. Coarse siltcannot be transported over long distances, but it is deposited in the vicinity of theresuspension area. Medium silt can be transported into this region of the AgulhasDrift, only when the eddy current is strong enough. Fine silt and very fine siltcan easily be carried into the drift area. The simulations show that medium andfine silt can be deposited on the Agulhas Drift, whereas very fine silt is furthertransported out of the area into the southern Transkei Basin." @default.
- W652454621 created "2016-06-24" @default.
- W652454621 creator A5022526821 @default.
- W652454621 date "2012-02-09" @default.
- W652454621 modified "2023-09-26" @default.
- W652454621 title "Numerical Simulation of Sediment Transport at the Agulhas Drift on the South African Gateway in relation to its Geodynamic Development" @default.
- W652454621 hasPublicationYear "2012" @default.
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