2009 Portland GSA Annual Meeting (18-21 October 2009)

Paper No. 2
Presentation Time: 1:45 PM

LATE HOLOCENE CLIMATE VARIABILITY RECORDED IN LAKE SEDIMENTS FROM NICARAGUA


STANSELL, Nathan D., Geology and Planetary Science, University of Pittsburgh, 4107 O'Hara Street, Rm 200 SRCC, Pittsburgh, PA 15260, ROSENMEIER, Michael F., Department of Geology and Planetary Science, University of Pittsburgh, 200 SRCC, Pittsburgh, PA 15260 and ABBOTT, Mark B., Geology and Planetary Science, Univ of Pittsburgh, 4107 O'Hara Street, RM 200 SRCC BLDG, Pittsburgh, PA 15260, nas12@pitt.edu

Lake sediments from the Pacific region of Nicaragua were used to record changes in the regional moisture balance during the late Holocene (~1600 cal yr BP to the present). Oxygen isotope values of calcium carbonate down-core identify periods of higher and lower lake water levels that resulted from changes in precipitation and evaporation rates. The lowest lake levels and driest regional conditions recorded in the isotope data are coincident with the onset of Little Ice Age cooling. This abrupt transition to more arid atmospheric conditions at 700 cal yr BP is consistent with other records from the northern tropics and subtropics that suggest hydrologic changes in the tropics were connected to high latitude climate variability during the late Holocene.