[OANNES Foro] Centennial changes in North Pacific anoxia linked tio tropical trade winds

[Mario Cabrejos]

Science 8 August 2014: 
Vol. 345 no. 6197 pp. 665-668 
DOI: 10.1126/science.1252332


 


Centennial changes in North Pacific anoxia linked to tropical trade winds


1.       <http://www.sciencemag.org/search?author1=Curtis+Deutsch&sortspec=date&submit=Submit> Curtis Deutsch <http://www.sciencemag.org/content/345/6197/665.abstract#aff-1> 1, <http://www.sciencemag.org/content/345/6197/665.abstract#corresp-1> *,   <http://www.sciencemag.org/search?author1=William+Berelson&sortspec=date&submit=Submit> William Berelson <http://www.sciencemag.org/content/345/6197/665.abstract#aff-2> 2,   <http://www.sciencemag.org/search?author1=Robert+Thunell&sortspec=date&submit=Submit> Robert Thunell <http://www.sciencemag.org/content/345/6197/665.abstract#aff-3> 3,   <http://www.sciencemag.org/search?author1=Thomas+Weber&sortspec=date&submit=Submit> Thomas Weber <http://www.sciencemag.org/content/345/6197/665.abstract#aff-1> 1,   <http://www.sciencemag.org/search?author1=Caitlin+Tems&sortspec=date&submit=Submit> Caitlin Tems <http://www.sciencemag.org/content/345/6197/665.abstract#aff-2> 2,   <http://www.sciencemag.org/search?author1=James+McManus&sortspec=date&submit=Submit> James McManus <http://www.sciencemag.org/content/345/6197/665.abstract#aff-4> 4, <http://www.sciencemag.org/content/345/6197/665.abstract#fn-1> †,  <http://www.sciencemag.org/search?author1=John+Crusius&sortspec=date&submit=Submit> John Crusius <http://www.sciencemag.org/content/345/6197/665.abstract#aff-5> 5,   <http://www.sciencemag.org/search?author1=Taka+Ito&sortspec=date&submit=Submit> Taka Ito <http://www.sciencemag.org/content/345/6197/665.abstract#aff-6> 6,   <http://www.sciencemag.org/search?author1=Timothy+Baumgartner&sortspec=date&submit=Submit> Timothy Baumgartner <http://www.sciencemag.org/content/345/6197/665.abstract#aff-7> 7,   <http://www.sciencemag.org/search?author1=Vicente+Ferreira&sortspec=date&submit=Submit> Vicente Ferreira <http://www.sciencemag.org/content/345/6197/665.abstract#aff-7> 7,   <http://www.sciencemag.org/search?author1=Jacob+Mey&sortspec=date&submit=Submit> Jacob Mey <http://www.sciencemag.org/content/345/6197/665.abstract#aff-8> 8, <http://www.sciencemag.org/content/345/6197/665.abstract#aff-9> 9,   <http://www.sciencemag.org/search?author1=Alexander+van+Geen&sortspec=date&submit=Submit> Alexander van Geen <http://www.sciencemag.org/content/345/6197/665.abstract#aff-8> 8 

1.      1School of Oceanography, University of Washington, Seattle, WA, USA. 2Department of Earth Sciences, University of Southern California, Los Angeles, CA, USA. 3Department of Earth and Ocean Sciences, University of South Carolina, Columbia, SC, USA. 4College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, USA. 5U.S. Geological Survey, University of Washington School of Oceanography, Seattle, WA, USA. 6School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, USA. 7Departamento de Oceanografía Biológica, Centro de Investigación Científica y de Educación Superior de Ensenada, Baja California, México. 8Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, USA. 9Department of Physical Sciences, Kingsborough Community College, City University of New York, New York, NY, USA.*Corresponding author. E-mail:  <mailto:cdeutsch en uw.edu> cdeutsch en uw.edu

2.       

·          <http://www.sciencemag.org/content/345/6197/tab-abstract> ABSTRACT

Climate warming is expected to reduce oxygen (O2) 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 (δ15N) from multiple sediment cores. Increasing δ15N since ~1990 records an expansion of anoxia, consistent with observed O2 trends. However, this was preceded by a longer declining δ15N 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 O2 demand within the OMZ. If equatorial Pacific winds resume their predicted weakening trend, the ocean’s largest anoxic zone will contract despite a global O2 decline.

 



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