Tree ring imprints of long-term changes in climate in western Himalaya,India |
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Authors: | R R Yadav |
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Institution: | (1) Institute of Botany and Landscape Ecology, Greifswald University, Grimmer Strasse 88, Greifswald, D17487, Germany;(2) Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow, 226007, India |
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Abstract: | Tree-ring analyses from semi-arid to arid regions in western Himalaya show immense potential for developing millennia long
climate records. Millennium and longer ring-width chronologies of Himalayan pencil juniper (Juniperus polycarpos), Himalayan pencil cedar (Cedrus deodara) and Chilgoza pine (Pinus gerardiana) have been developed from different sites in western Himalaya. Studies conducted so far on various conifer species indicate
strong precipitation signatures in ring-width measurement series. The paucity of weather records from stations close to tree-ring
sampling sites poses difficulty in calibrating tree-ring data against climate data especially precipitation for its strong
spatial variability in mountain regions. However, for the existence of strong coherence in temperature, even in data from
distant stations, more robust temperature reconstructions representing regional and hemispheric signatures have been developed.
Tree-ring records from the region indicate multi-century warm and cool anomalies consistent with the Medieval Warm Period
and Little Ice Age anomalies.
Significant relationships noted between mean premonsoon temperature over the western Himalaya and ENSO features endorse utility
of climate records from western Himalayan region in understanding long-term climate variability and attribution of anthropogenic
impact. |
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