FN Archimer Export Format
PT J
TI Shelf-edge jet currents in the southern Benguela: a modelling approach
BT 
AF VEITCH, Jennifer
   HERMES, Juliet
   LAMONT, Tarron
   PENVEN, Pierrick
   DUFOIS, Francois
AS 1:1;2:1;3:2,3,4;4:5;5:6;
FF 1:;2:;3:;4:;5:;
C1 South African Environm Observat Network, Private Bag X2, ZA-8012 Cape Town, South Africa.
   Dept Environm Affairs, Oceans & Coasts Res Branch, Private Bag X4390, ZA-8000 Cape Town, South Africa.
   Univ Cape Town, Marine Res Inst, Private Bag X3, ZA-7701 Rondebosch, South Africa.
   Univ Cape Town, Dept Oceanog, Private Bag X3, ZA-7701 Rondebosch, South Africa.
   Univ Brest, CNRS, IRD, IFREMER,LOPS,IUEM, F-29280 Brest, France.
   Univ Western Australia, ARC Ctr Excellence Coral Reef Studies, Crawley, WA 6009 USA.
C2 SAEON, SOUTH AFRICA
   OCEANS & COASTS RES, SOUTH AFRICA
   UNIV CAPE TOWN, SOUTH AFRICA
   UNIV CAPE TOWN, SOUTH AFRICA
   IRD, FRANCE
   UNIV WESTERN AUSTRALIA, USA
UM LOPS
IF 2.539
TC 15
UR https://archimer.ifremer.fr/doc/00403/51401/51976.pdf
LA English
DT Article
DE ;Southern Benguela;Shelf-edge jet;Numerical model
AB The dynamics and seasonal variability of jet currents on the southern Benguela shelf-edge are investigated using a climatologically forced ROMS model. The jet is primarily forced by the intense horizontal gradients that exist across the southern Benguela shelf. These gradients are set up by nearshore cooling via the strongly seasonal upwelling regime and variable offshore warming by the advection of Agulhas waters. While the nearshore cooling is prevalent only during the spring and summer upwelling season, the offshore warming exists throughout the year. As a result intensified geostrophically adjusted currents exist throughout the year, particularly off the Cape Peninsula and Cape Columbine. However, the distinct shelf-edge jet features are most intense during upwelling seasons and extend, more or less continuously, from Cape Agulhas, the southern-tip of the continent, to Cape Columbine. The spring and summer jet off the Cape Peninsula reaches speeds of at least 0.7 m.s −1, bifurcates as it moves northward. The branch that continues northward over the shelf goes on to feed the offshore branch of the Cape Columbine jet (over the 500 m isobath) and to a less extent the nearshore branch (over the 200 m isobath) that is locally enhanced by upwelling processes. During winter, the CP jet is more confined to the shelf region and goes on to feed the whole outer-shelf (200-500 m) region off and beyond Cape Columbine. An ageostrophic component associated with offshore non-linearities related to Agulhas influx causes the mean manifestation of the Cape Peninsula jet to broaden slightly (60 km) compared to its 40 km-wide geostrophic core which is situated over the 350 m isobath. The ageostrophic component is related to the generation of eddies that cause the isopycnals to flatten out. 
PY 2018
PD DEC
SO Journal Of Marine Systems
SN 0924-7963
PU Elsevier Science Bv
VL 188
UT 000447099900004
BP 27
EP 38
DI 10.1016/j.jmarsys.2017.09.003
ID 51401
ER

EF