The leading mode of Indian Summer Monsoon precipitation variability during the last millennium

DOI Web Site Web Site 被引用文献6件
  • Ashish Sinha
    Department of Earth Science California State University Dominguez Hills Carson California USA
  • Max Berkelhammer
    Cooperative Institute for Research in Environmental Sciences University of Colorado at Boulder Boulder Colorado USA
  • Lowell Stott
    Department of Earth Science University of Southern California Los Angeles California USA
  • Manfred Mudelsee
    Climate Risk Analysis Hanover Germany
  • Hai Cheng
    Institute of Global Environmental Change Xi'an Jiaotong University Xi'an China
  • Jayant Biswas
    National Cave Research and Protection Organization Raipur India

書誌事項

公開日
2011-08
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/2011gl047713
公開者
American Geophysical Union (AGU)

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説明

<jats:p>The “internally” generated intraseasonal variability of the Indian Summer Monsoon is characterized by intermittent periods of enhanced (“active”) and deficient (“break”) precipitation, which produce a quasi east‐west precipitation dipole over the Indian subcontinent. Here we present multicentennial‐length and near annually‐resolved reconstructions of monsoon precipitation, inferred from absolute‐dated and instrumentally calibrated speleothem oxygen isotope records from regions (central and northeast India) that have diametric responses to active‐break monsoon circulation patterns. On centennial timescales (AD 1400–2008), precipitation variability from these two regions exhibit opposing behavior, oscillating between periods with a persistently “active‐dominated” (AD ∼1700 to 2007) and a “break‐dominated” (AD 1400 to ∼1700) regime. The switch between these regimes occurs abruptly (within decades) at a time (AD ∼ 1650–1700) when a proxy record of upwelling intensity from the Arabian Sea suggest an abrupt increase in the monsoon winds. On the basis of these observations, we hypothesize that the frequency distribution of active‐break periods varies on centennial timescales, implying a leading role of internal dynamics in governing the ISM response to slowly‐evolving changes in the external boundary conditions.</jats:p>

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