Hostname: page-component-76d6cb85b7-f97m6 Total loading time: 0 Render date: 2026-07-14T16:49:33.444Z Has data issue: false hasContentIssue false

Quaternary Fluctuations in the Northern Hemisphere Trade Winds and Westerlies

Published online by Cambridge University Press:  20 January 2017

Thomas R. Janecek
Affiliation:
Oceanography Program, Department of Atmospheric and Oceanic Science, University of Michigan, Ann Arbor, Michigan 48109
David K. Rea
Affiliation:
Oceanography Program, Department of Atmospheric and Oceanic Science, University of Michigan, Ann Arbor, Michigan 48109

Abstract

The mass accumulation rate and grain size of the total colian component isolated from pelagic sediment in two North Pacific cores, piston core KK75-02 under the prevailing westerlies and Deep-Sea Drilling Project Site 503 beneath the trade winds, have been used to evaluate changes in the intensity of atmospheric circulation and source-area aridity over the past 700,000 yr. The eolian grain size, a direct indicator of wind intensity, fluctuates at periodicities similar to those calculated for the earth's orbital parameters of precession, obliquity, and eccentricity. Both sites display greater variability in wind intensity prior to 250,000 yr ago. Eolian accumulation rates, an indicator of source-area aridity, fluctuate at periodicities similar to those of the glacial-interglacial cycles. Lower eolian accumulation rates during colder (glacial) times most likely reflect increased glacial-age humidity at central Asian and Central American source areas.

Information

Type
Research Article
Copyright
University of Washington

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Article purchase

Temporarily unavailable