HR: 0800h
AN: PP11B-0525    [Abstracts]
TI: Century-Scale Trends in the Indian Summer Monsoon During the Last 2,000 Years
AU: D'Ippolito, C K
EM: ckdippolito@gmail.com
AF: Department of Geological Sciences, University of South Carolina, Columbia, SC 29208,
AU: * Anderson, D M
EM: david.m.anderson@noaa.gov
AF: Paleoclimatology Branch, NOAA's National Climatic Data Center, 325 Broadway, Boulder, CO 80305, United States
AU: * Anderson, D M
EM: david.m.anderson@noaa.gov
AF: INSTAAR, University of Colorado, Boulder, CO 80303, United States
AU: DuVivier, A K
EM: a_duvivier@ColoradoCollege.edu
AF: Department of Physics, Colorado College, Colorado Springs, CO 80903, United States
AU: Gupta, A K
EM: anilg@gg.iitkgp.ernet.in
AF: Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur, 721302, India
AB: Reconstructions of the Indian Summer Monsoon over the past 2,000 years reveal abrupt changes from one century to the next. Persistence of these natural changes into the future would challenge societies that are adapted to a narrow range of climate variability. New paleoclimate records of the Indian Summer Monsoon winds over the past few thousand years were derived from Arabian Sea sediments, and we compared them with other records of the monsoon, including cave deposits from Oman and India, and pollen records from Sri Lanka to create a more complete picture of century scale trends. The monsoon winds were stronger, and the ITCZ located northward, during a warm interval sometimes termed the Medieval Warm Period. The monsoon winds were weaker, and the ITCZ located farther south during the Little Ice Age, when the northern latitudes were cooler. This study reveals a natural oscillation in the monsoon upon which future change might be superimposed, and also indicates a potential relationship between northern warming (induced by greenhouse gas accumulation), the monsoons, and the ITCZ.
DE: 1626 Global climate models (3337, 4928)
DE: 3344 Paleoclimatology (0473, 4900)
SC: Paleoceanography and Paleoclimatology [PP]
MN: 2007 Fall Meeting