Lagrangian particle transport in the Indian Ocean: A model study
IR@C-MMACS: CSIR-Centre for Mathematical Modelling and Computer Simulation, Bangalore
View Archive Info| Field | Value | |
| Title |
Lagrangian particle transport in the Indian Ocean:
A model study
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| Creator |
P S, Swathi
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| Subject |
Ocean Modelling
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| Description |
Lagrangian transport of "passive" particles in the Indian Ocean is
diagnosed using the global Modular Ocean Model 2 of the Geophysical Fluid
Dynamics Laboratory. First, the model is forced by time-varying monthly mean
climatological wind stresses, and a particle cloud released in the Indonesian
throughflow( ITF) regioni s trackedf or one year. In the next experiment,t wo
separate clouds, one released in the ITF region and the other in the Arabian
Sea region, are followed for three years by forcing the model with weekly varying
NMC9195 wind stress data. In both the experiments, short-term Liapounov
exponents indicate that particle trajectories are chaotic, with typical e-folding
stretching time about 125 days. The zonal dispersion of the ITF cloud is faster
than the shear-flow-dominated transport process in the first experiment, as well
as for the first two years in the second experiment. However, at later times the
zonal dispersion rate is subquadratic in the latter experiment. For the Arabian
Sea cloud, zonal dispersion is diffusive when the whole time range of three years
is considered. However, for the initial six months, it is shear-flow-dominated and
thereafter becomese ven subdiffusive.T he meridionald ispersionr ate is roughly
superdiffusive, in both experiments, when the whole time range is taken into
account. Our estimates of correlation dimension, a lower bound on the fractal
dimension, suggest that none of the particle clouds reach the area-filling limit in
the time range of the model integration. We also compare the present results with
those from earlier studies of chaotic stirring in the oceans.
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| Publisher |
American Geophysical Union
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| Date |
1999-03-15
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cir.cmmacs.ernet.in/117/1/binson_pss.pdf
P S, Swathi (1999) Lagrangian particle transport in the Indian Ocean: A model study. J of Geophysical Research, 104 (C3). pp. 5211-5224. |
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| Relation |
http://www.agu.org/pubs
http://cir.cmmacs.ernet.in/117/ |
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