Reconstruction of Antarctic climate change using ice core proxy records from the coastal Dronning Maud Land, East Antarctica

  • Meloth Thamban
  • C. M. Laluraj
  • Sushant S. Naik
  • Arun Chaturvedi
Article

Abstract

Antarctic ice core records have provided unprecedented information on past climatic changes and forcing factors on decadal to millennial timescales. The glaciochemical and stable isotope records of a shallow ice core from the coastal Dronning Maud Land (East Antarctica) were used here to reconstruct the coastal Antarctic environmental variability during the past ∼470 years. Sea salt ion data indicate a significant additional contribution of chloride ions compared to sea water values, possibly through atmospheric scavenging. The nitrate (NO3) profile exhibit significant temporal shifts than that of the sulphate (SO42−), with a major shift around 1750 AD. The changes in NO3 record are synchronous with the proxy record of solar activity (10Be profile from a South Pole ice core), suggesting enhanced NO3 values during periods of reduced solar activity like the Dalton Minimum (∼1790–1830 AD) and Maunder Minimum (∼1640–1710 AD). The δ18O records reveal that the more negative δ18O values were coeval with several events of increased NO3 concentrations, suggesting enhanced preservation of NO3 during periods of reduced air temperatures. The δ18O and δD records of the core also suggest significant short-term and long-tem variability with more negative values indicating relatively lower air temperatures prior to 1715 AD. The δ18O records also revealed a significant warming of 2.7°C for the past 470 years, with a warming of ∼0.6°C per century.

Keywords

Glaciochemistry Stable isotope Ice core Solar activity Dronning Maud Land Antarctica 

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Copyright information

© Geological Society of India 2011

Authors and Affiliations

  • Meloth Thamban
    • 1
  • C. M. Laluraj
    • 1
  • Sushant S. Naik
    • 1
    • 2
  • Arun Chaturvedi
    • 3
  1. 1.National Centre for Antarctic and Ocean Research Headland SadaVasco-da-Gama, GoaIndia
  2. 2.National Institute of OceanographyDona Paula, GoaIndia
  3. 3.Geological Survey of India (Antarctica Division) NH-5P, N.I.T.FaridabadIndia

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