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Tropical sea surface temperatures and the earth's orbital eccentricity cycles

DRS at CSIR-National Institute of Oceanography

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Title Tropical sea surface temperatures and the earth's orbital eccentricity cycles
 
Creator Gupta, S.M.
Fernandes, A.A.
Mohan, R.
 
Subject tropical oceanography
tropical meteorology
surface temperature
palaeoceanography
climatic changes
fossil radiolaria
deep water
sediments
greenhouse effect
geological time
earth orbit
stratigraphy
 
Description The tropical oceanic warm pools are climatologically important regions because their sea surface temperatures (SSTs) are positively related to atmospheric greenhouse effect and the cumulonimbus-cirrus cloud anvil. Such a warm pool is also present in the central tropical Indian Ocean. Paleo-SSTs estimated by the radiolarian transfer functions for the last ~200-1400 kiloyers (ka) in a deep-sea sediment core from this warm pool fluctuated within 2.75 degrees C (26.14-28.89 degrees C) around the threshold temperature (27 degrees C) for the super greenhouse effect. It is possible that this SST variation might have led to the corresponding fluctuation in the greenhouse effect and the cirrus cloud anvil in the geological past. These paleo-SSTs also exhibited cyclicities at ~100- and ~400-ka corresponding to the Earth's orbital eccentricity cycles. Results, therefore imply that the tropical Indian Ocean warm pool persisted during the Quaternary and the paleo-SSTs fluctuating at the orbital eccentricity frequencies might have modulated the intensity of greenhouse effect
 
Date 2009-01-21T11:16:57Z
2009-01-21T11:16:57Z
1996
 
Type Journal Article
 
Identifier Geophysical Research Letters, Vol.23; 3159-3162p.
http://drs.nio.org/drs/handle/2264/2262
 
Language en
 
Rights Copyright [1996]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
 
Publisher American Geophysical Union