Open Access Digital Repository of Ministry of Earth Sciences, Government of India

Pacific coral oxygen isotope and the tropospheric temperature gradient over the Asian monsoon region: A tool to reconstruct past Indian summer monsoon rainfall

Chakraborty, S and Goswami, BN and Dutta, K (2012) Pacific coral oxygen isotope and the tropospheric temperature gradient over the Asian monsoon region: A tool to reconstruct past Indian summer monsoon rainfall. Journal of Quaternary Science, 27 (3). pp. 269-278.

[img]
Preview
PDF
Pacific coral oxygen isotope.pdf - Published Version

Download (1MB) | Preview

Abstract

Having recognized that it is the tropospheric temperature (TT) gradient rather than the land-ocean surface temperature gradient that drives the Indian monsoon, a new mechanism of El Niño/Southern Oscillation (ENSO) monsoon teleconnection has been unveiled in which the ENSO influences the Indian monsoon by modifying the TT gradient over the region. Here we show that equatorial Pacific coralline oxygen isotopes reflect TT gradient variability over the Indian monsoon region and are strongly correlated to monsoon precipitation as well as to the length of the rainy season. Using these relationships we have been able to reconstruct past Indian monsoon rainfall variability of the first half of the 20th century in agreement with the instrumental record. Additionally, an older coral oxygen isotope record has been used to reconstruct seasonally resolved summer monsoon rainfall variability of the latter half of the 17th century, indicating that the average annual rainfall during this period was similar to that during the 20th century.

Item Type: Article
Additional Information: Copyright of this article belongs to John Wiley & Sons
Uncontrolled Keywords: air temperature; coral; El Nino-Southern Oscillation; monsoon; oxygen isotope; paleoclimate; precipitation (climatology); rainfall; teleconnection; temperature gradient; troposphere, Pacific Ocean; Pacific Ocean (Equatorial), Anthozoa
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 28 Dec 2013 18:05
Last Modified: 28 Dec 2013 18:05
URI: http://moeseprints.incois.gov.in/id/eprint/505

Actions (login required)

View Item View Item