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The southwest Indian Monsoon over the last 18 000 years

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Abstract

Previously published results suggest that the strength of the SW Indian Monsoon can vary significantly on century- to millenium time scales, an observation that has important implications for assessments of future climate and hydrologic change over densely populated portions of Asia. We present new, well-dated, multi-proxy records of past monsoon variation from three separate Arabian Sea sediment cores that span the last glacial maximum to late-Holocene. To a large extent, these records confirm earlier published suggestions that the monsoon strengthened in a series of abrupt events over the last deglaciation. However, our data provide a somewhat refined picture of when these events took place, and suggest the primacy of two abrupt increases in monsoon intensity, one between 13 and 12.5 ka, and the other between 10 and 9.5 ka. This conclusion is supported by the comparisons between our new marine data and published paleoclimatic records throughout the African-Asian monsoon region. The comparison of data sets further supports the assertion that maximum monsoon intensity lagged peak insolation forcing by about 3000 years, and extended from about 9.5 to 5.5 ka. The episodes of rapid monsoon intensification coincided with major shifts in North Atlantic-European surface temperatures and ice-sheet extent. This coincidence, coupled with new climate model experiments, suggests that the large land-sea thermal gradient needed to drive strong monsoons developed only after glacial conditions upstream of, and on, the Tibetan Plateau receded (cold North Atlantic sea-surface temperatures, European ice-sheets, and extensive Asian snow cover). It is likely that abrupt changes in seasonal soil hydrology were as important to past monsoon forcing as were abrupt snow-related changes in regional albedo. Our analysis suggests that the monsoon responded more linearly to insolation forcing after the disappearance of glacial boundary conditions, decreasing gradually after about 6 ka. Our data also support the possibility that significant century-scale decreases in monsoon intensity took place during the early to mid-Holocene period of enhanced monsoon strength, further highlighting the need to understand paleomonsoon dynamics before accurate assessments of future monsoon strength can be made.

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Authors and Affiliations

  1. NOAA Paleoclimatology Program, National Geophysical Data Center, 325 Broadway, 80303, Boulder, Colorado, USA

    Jonathan Overpeck & David Anderson

  2. Institute of Arctic and Alpine Research, University of Colorado, 80309, Boulder, Colorado, USA

    Jonathan Overpeck

  3. Department of Earth System Science, University of California, 92717, Irvine, CA, USA

    Susan Trumbore

  4. Department of Geological Sciences, Brown University, 02912, Providence, RI, USA

    Warren Prell

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  1. Jonathan Overpeck
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Overpeck, J., Anderson, D., Trumbore, S. et al. The southwest Indian Monsoon over the last 18 000 years. Climate Dynamics 12, 213–225 (1996). https://doi.org/10.1007/BF00211619

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