Large wind shift on the great plains during the medieval warm period

Venkataramana Sridhar, David B. Loope, James B. Swinehart, Joseph A. Mason, Robert J. Oglesby, Clinton M. Rowe

Research output: Contribution to journalArticlepeer-review

67 Scopus citations

Abstract

Spring-summer winds from the south move moist air from the Gulf of Mexico to the Great Plains. Rainfall in the growing season sustains prairie grasses that keep large dunes in the Nebraska Sand Hills immobile. Longitudinal dunes built during the Medieval Warm Period (800 to 1000 years before the present) record the last major period of sand mobility. These dunes are oriented NW-SE and are composed of cross-strata with bipolar dip directions. The trend and structure of the dunes record a drought that was initiated and sustained by a historically unprecedented shift of spring-summer atmospheric circulation over the Plains: Moist southerly flow was replaced by dry southwesterly flow.

Original languageEnglish (US)
Pages (from-to)345-347
Number of pages3
JournalScience
Volume313
Issue number5785
DOIs
StatePublished - Jul 21 2006

ASJC Scopus subject areas

  • General

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