EarthRef.org Reference Database (ERR)
Development and Maintenance by the EarthRef.org Database Team

Detailed Reference Information
Polyak & Asmerom 2005
Polyak, V.J. and Asmerom, Y. (2005). Orbital control of long-term moisture in the southwestern USA. Geophysical Research Letters 32: doi: 10.1029/2005GL023919. issn: 0094-8276.

Regional lake sediment records, including late Pleistocene Lake Estancia, New Mexico, show that the southwestern USA was wetter than present over the last glacial maximum and drier during the Holocene. Chronology of speleothems that mark groundwater levels in Cavenee Caverns near Lake Estancia, indicates water-level lowering through the cave during the early to middle Holocene (8500 yr BP) consistent with the timing of desiccation of Lake Estancia and deflation of the basin floor. The speleothem record also shows the same wetter to drier climatic shift during the penultimate glacial and interglacial transition at 134 kyr BP (subaqueous crusts formed when cave submerged) to 121 kyr BP (cave rafts formed during water table drop). Our data support wet glacials and dry interglacials as being a general feature of Pleistocene climate in the southwestern USA. The timing suggests that the process is orbitally controlled.

BACKGROUND DATA FILES

Abstract

Keywords
Global Change, Regional climate change, Atmospheric Processes, Paleoclimatology (0473, 4900), Paleoceanography, Speleothems, Paleoceanography, Glacial, Paleoceanography, Interglacial
Journal
Geophysical Research Letters
http://www.agu.org/journals/gl/
Publisher
American Geophysical Union
2000 Florida Avenue N.W.
Washington, D.C. 20009-1277
USA
1-202-462-6900
1-202-328-0566
service@agu.org
Click to clear formClick to return to previous pageClick to submit