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Foraminiferal evidences for 77-year cycles of droughts in India and its possible modulation by the gleissberg solar cycle

DRS at CSIR-National Institute of Oceanography

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Title Foraminiferal evidences for 77-year cycles of droughts in India and its possible modulation by the gleissberg solar cycle
 
Creator Nigam, R.
Khare, N.
Nair, R.R.
 
Description A 1.15 m long core collected from 20 m water depth off Karwar on the western continental shelf of India was studied to reconstruct the paleomonsoonal, precipitational history during the recent past with fine time resolution by exploiting foraminifera as proxy. These established parameters (indicating salinity fluctuations, thus runoff from rivers due to the monsoonal precipitation over catchment area) are an angular-asymmetrical morpho-group, directly proportional to salinity. The mean proloculus size of Rotalidium annectens (Parker and Jones), is inversely proportional to salinity and an abundance of indicator species R. annectens is directly proportional to salinity. These parameters show considerable fluctuations in the core (representing about 450 years) indicating variations in paleomonsoons in a cyclic manner (around 77 years). Attempts to establish correlation between inferred paleomonsoonal precipitation with known climatic cycles affecting the earth's climate suggest a possible link with the Gleissberg solar cycle of around 80 + or - 10 years, which is already noted in various other climatic records
 
Date 2009-01-25T06:05:34Z
2009-01-25T06:05:34Z
1995
 
Type Journal Article
 
Identifier Journal of Coastal Research, Vol.11(4); 1099-1107p.
http://drs.nio.org/drs/handle/2264/2361
 
Language en
 
Rights Copyright [1995]. 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 Coastal Research Foundation