Large Wind Shift on the Great Plains During the Medieval Warm Period-Reference-Cited by-同舟云学术

Large Wind Shift on the Great Plains During the Medieval Warm Period

Published:2006-07-21 Issue:5785 Volume:313 Page:345-347
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Sridhar Venkataramana¹²³,Loope David B.¹²³,Swinehart James B.¹²³,Mason Joseph A.¹²³,Oglesby Robert J.¹²³,Rowe Clinton M.¹²³

Affiliation:

1. Department of Geosciences, University of Nebraska, Lincoln, NE 68588–0340, USA.

2. School of Natural Resources, University of Nebraska, Lincoln, NE 68583–0758, USA.

3. Department of Geography, University of Wisconsin, Madison, WI 53706, USA.

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.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference35 articles.

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