Centennial changes in North Pacific anoxia linked to tropical trade winds-Reference-Cited by-同舟云学术

Centennial changes in North Pacific anoxia linked to tropical trade winds

Published:2014-08-08 Issue:6197 Volume:345 Page:665-668
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Deutsch Curtis¹,Berelson William²,Thunell Robert³,Weber Thomas¹,Tems Caitlin²,McManus James⁴,Crusius John⁵,Ito Taka⁶,Baumgartner Timothy⁷,Ferreira Vicente⁷,Mey Jacob⁸⁹,van Geen Alexander⁸

Affiliation:

1. School of Oceanography, University of Washington, Seattle, WA, USA.

2. Department of Earth Sciences, University of Southern California, Los Angeles, CA, USA.

3. Department of Earth and Ocean Sciences, University of South Carolina, Columbia, SC, USA.

4. College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, USA.

5. U.S. Geological Survey, University of Washington School of Oceanography, Seattle, WA, USA.

6. School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, USA.

7. Departamento de Oceanografía Biológica, Centro de Investigación Científica y de Educación Superior de Ensenada, Baja California, México.

8. Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, USA.

9. Department of Physical Sciences, Kingsborough Community College, City University of New York, New York, NY, USA.

Abstract

Climate warming is expected to reduce oxygen (O 2 ) supply to the ocean and expand its oxygen minimum zones (OMZs). We reconstructed variations in the extent of North Pacific anoxia since 1850 using a geochemical proxy for denitrification (δ 15 N) from multiple sediment cores. Increasing δ 15 N since ~1990 records an expansion of anoxia, consistent with observed O 2 trends. However, this was preceded by a longer declining δ 15 N trend that implies that the anoxic zone was shrinking for most of the 20th century. Both periods can be explained by changes in winds over the tropical Pacific that drive upwelling, biological productivity, and O 2 demand within the OMZ. If equatorial Pacific winds resume their predicted weakening trend, the ocean’s largest anoxic zone will contract despite a global O 2 decline.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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