scholarly journals The flow field of the subtropical gyre of the South Indian Ocean

1997 ◽  
Vol 102 (C3) ◽  
pp. 5513-5530 ◽  
Author(s):  
L. Stramma ◽  
J. R. E. Lutjeharms
Keyword(s):  
Indian Ocean ◽  
Flow Field ◽  
Subtropical Gyre ◽  
The South ◽  
South Indian Ocean ◽  
South Indian

137Cs water profiles in the South Indian Ocean – An evidence for accumulation of pollutants in the subtropical gyre

2011 ◽  
Vol 89 (1-4) ◽  
pp. 17-30 ◽  
Author(s):  
P.P. Povinec ◽  
M. Aoyama ◽  
M. Fukasawa ◽  
K. Hirose ◽  
K. Komura ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Subtropical Gyre ◽  
The South ◽  
South Indian Ocean ◽  
South Indian ◽  
Accumulation Of Pollutants

scholarly journals Inertially Induced Connections between Subgyres in the South Indian Ocean

2009 ◽  
Vol 39 (2) ◽  
pp. 465-471 ◽  
Author(s):  
V. Palastanga ◽  
H. A. Dijkstra ◽  
W. P. M. de Ruijter
Keyword(s):  
Indian Ocean ◽  
Ocean Basin ◽  
Subtropical Gyre ◽  
Nonlinear Regime ◽  
Water Model ◽  
The South ◽  
South Indian Ocean ◽  
Southern Boundary ◽  
South Indian ◽  
Highly Nonlinear

Abstract A barotropic shallow-water model and continuation techniques are used to investigate steady solutions in an idealized South Indian Ocean basin containing Madagascar. The aim is to study the role of inertia in a possible connection between two subgyres in the South Indian Ocean. By increasing inertial effects in the model, two different circulation regimes are found. In the weakly nonlinear regime, the subtropical gyre presents a recirculation cell in the southwestern basin, with two boundary currents flowing westward from the southern and northern tips of Madagascar toward Africa. In the highly nonlinear regime, the inertial recirculation of the subtropical gyre is found to the east of Madagascar, while the East Madagascar Current overshoots the island’s southern boundary and connects through a southwestward jet with the current off South Africa.

scholarly journals Sediment trap-derived particulate matter fluxes in the oligotrophic subtropical gyre of the South Indian Ocean

2021 ◽  
pp. 104924
Author(s):  
Natalie C. Harms ◽  
Niko Lahajnar ◽  
Birgit Gaye ◽  
Tim Rixen ◽  
Ulrich Schwarz-Schampera ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Indian Ocean ◽  
Sediment Trap ◽  
Subtropical Gyre ◽  
The South ◽  
South Indian Ocean ◽  
South Indian

Impacts of ocean currents on the South Indian Ocean extratropical storm track through the relative wind effect

2021 ◽  
pp. 1-61
Author(s):  
Hyodae Seo ◽  
Hajoon Song ◽  
Larry W. O’Neill ◽  
Matthew R. Mazloff ◽  
Bruce D. Cornuelle
Keyword(s):  
Indian Ocean ◽  
Ocean Circulation ◽  
Storm Track ◽  
Ocean Current ◽  
Wind Effect ◽  
Turbulent Heat ◽  
The South ◽  
South Indian Ocean ◽  
South Indian ◽  
Relative Wind

AbstractThis study examines the role of the relative wind (RW) effect (wind relative to ocean current) in the regional ocean circulation and extratropical storm track in the South Indian Ocean. Comparison of two high-resolution regional coupled model simulations with/without the RW effect reveals that the most conspicuous ocean circulation response is the significant weakening of the overly energetic anticyclonic standing eddy off Port Elizabeth, South Africa, a biased feature ascribed to upstream retroflection of the Agulhas Current (AC). This opens a pathway through which the AC transports the warm and salty water mass from the subtropics, yielding marked increases in sea surface temperature (SST), upward turbulent heat flux (THF), and meridional SST gradient in the Agulhas retroflection region. These thermodynamic and dynamic changes are accompanied by the robust strengthening of the local low-tropospheric baroclinicity and the baroclinic wave activity in the atmosphere. Examination of the composite lifecycle of synoptic-scale storms subjected to the high THF events indicates a robust strengthening of the extratropical storms far downstream. Energetics calculations for the atmosphere suggest that the baroclinic energy conversion from the basic flow is the chief source of increased eddy available potential energy, which is subsequently converted to eddy kinetic energy, providing for the growth of transient baroclinic waves. Overall, the results suggest that the mechanical and thermal air-sea interactions are inherently and inextricably linked together to substantially influence the extratropical storm tracks in the South Indian Ocean.

Eastward Shift of Interannual Climate Variability in the South Indian Ocean since 1950

2021 ◽  
pp. 1-46
Author(s):  
Lei Zhang ◽  
Weiqing Han ◽  
Kristopher B. Karnauskas ◽  
Yuanlong Li ◽  
Tomoki Tozuka
Keyword(s):  
Indian Ocean ◽  
Climate Variability ◽  
Decadal Variability ◽  
Dominant Role ◽  
Tropical Pacific ◽  
The South ◽  
South Indian Ocean ◽  
Climate Modes ◽  
South Indian ◽  
Interannual Climate Variability

AbstractThe subtropical Indian Ocean Dipole (SIOD) and Ningaloo Niño are the two dominant modes of interannual climate variability in the subtropical South Indian Ocean. Observations show that the SIOD has been weakening in the recent decades, while Ningaloo Niño has been strengthening. In this study, we investigate the causes for such changes by analyzing climate model experiments using the NCAR Community Earth System Model version 1 (CESM1). Ensemble-mean results from CESM1 large-ensemble (CESM1-LE) suggest that the external forcing causes negligible changes in the amplitudes of the SIOD and Ningaloo Niño, suggesting a dominant role of internal climate variability. Meanwhile, results from CESM1 pacemaker experiments reveal that the observed changes in the two climate modes cannot be attributed to the effect of sea surface temperature anomalies (SSTA) in either the tropical Pacific or tropical Indian Oceans. By further comparing different ensemble members from the CESM1-LE, we find that a Warm Pool Dipole mode of decadal variability, with opposite SSTA in the southeast Indian Ocean and the western-central tropical Pacific Ocean plays an important role in driving the observed changes in the SIOD and Ningaloo Niño. These changes in the two climate modes have considerable impacts on precipitation and sea level variabilities in the South Indian Ocean region.

Sign in / Sign up

Export Citation Format

Share Document