Shifts in Location of SST Maximum and the Puzzle of El-Nino Monsoon Association
IR@C-MMACS: CSIR-Centre for Mathematical Modelling and Computer Simulation, Bangalore
View Archive Info| Field | Value | |
| Title |
Shifts in Location of SST Maximum and the Puzzle of El-Nino Monsoon Association
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| Creator |
Goswami, P
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| Subject |
Indian Monsoon
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| Description |
The association between the El-Nino events over the Pacific and the Indian summer monsoon
is one of the most enigmatic features in our climate system; while some El-Nino events are
associated with drought over India, other, stronger El-Nino events, seem to have little effect.
We show that the answer lies in another aspect of El-Nino that has received little attention.
Analysis of long-period data shows that the SST maximum in the equatorial Pacific occupies
one of two preferred locations: one around 170oE and the other around 185oE during an El-
Nino event. As the atmospheric response to SST, like the location of induced convergence
and divergence, strongly depends on the location of the SST maximum, this also results in a
shift of various effects of El-Nino at a characteristic zonal scale. The location of the SST
maximum exhibits a strong seasonal cycle with a sharp change in the May-June period. A
combined effect of these features is a selective association between El-Nino and Indian
summer monsoon. Our findings explain such anomalous behavior as lack of effect of strong
El-Nino of 1997 on the Indian summer monsoon. Implications of our findings for the
dynamics of El-Nino monsoon interaction as well as for prediction and model simulation are
discussed.
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| Publisher |
CSIR Centre for Mathematical Modelling and Computer Simulation
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| Date |
2004-11
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| Type |
Monograph
NonPeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cir.cmmacs.ernet.in/199/1/rrcm0407.pdf
Goswami, P (2004) Shifts in Location of SST Maximum and the Puzzle of El-Nino Monsoon Association. Technical Report. CSIR Centre for Mathematical Modelling and Computer Simulation, C-MMACS,Bangalore 560037,India. (Unpublished) |
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| Relation |
http://cir.cmmacs.ernet.in/199/
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