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El Niño and related monsoon drought signals in 523-year-long ring width records of teak (Tectona grandis L.F.) trees from south India

Borgaonkar, HP and Sikder, AB and Ram, S and Pant, GB (2010) El Niño and related monsoon drought signals in 523-year-long ring width records of teak (Tectona grandis L.F.) trees from south India. Palaeogeography, Palaeoclimatology, Palaeoecology, 285 (1-2). pp. 74-84.

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Abstract

We present a 523-year (A.D. 1481-2003) tree-ring width index chronology of Teak (Tectona grandis L.F.) from Kerala, Southern India, prepared from three forest sites. Dendroclimatological investigations indicate a significant positive relationship between the tree-ring index series and Indian summer monsoon rainfall (ISMR) and related global parameters like the Southern Oscillation Index (SOI). A higher frequency of occurrence of low tree growth is observed in years of deficient Indian monsoon rainfall (droughts) associated with El Niño since the late 18th century. Prior to that time, many low tree growth years are detected during known El Niño events, probably related to deficient Indian monsoon rainfall. The general relationship between ISMR and El Niño is known to be negative and the spatial correlations between our Kerala tree-ring chronology and sea surface temperatures (SSTs) over the Niño regions follow similar patterns as those for ISMR. This relationship indicates strong ENSO-related monsoon signals in the tree-ring records. These tree-ring chronologies with a high degree of sensitivity to monsoon climate are useful tools to understand the vagaries of monsoon rainfall prior to the period of recorded data.

Item Type: Article
Additional Information: Copyright of this article belongs to Elsevier
Uncontrolled Keywords: data set; dendroclimatology; drought; El Nino-Southern Oscillation; paleoclimate; rainfall; spatial analysis; timber; tree ring, India; Kerala, Tectona grandis
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 29 May 2015 09:28
Last Modified: 29 May 2015 09:28
URI: http://moeseprints.incois.gov.in/id/eprint/829

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