Centennial changes in North Pacific anoxia linked to tropical trade winds

被引：146

作者：

Deutsch, Curtis ^{[1
]}

Berelson, William ^{[2
]}

Thunell, Robert ^{[3
]}

Weber, Thomas ^{[1
]}

Tems, Caitlin ^{[2
]}

McManus, James ^{[4
]}

Crusius, John ^{[5
]}

Ito, Taka ^{[6
]}

Baumgartner, Timothy ^{[7
]}

Ferreira, Vicente ^{[7
]}

Mey, Jacob ^{[8
,9
]}

van Geen, Alexander ^{[8
]}

机构：

[1] Univ Washington, Sch Oceanog, Seattle, WA 98195 USA

[2] Univ So Calif, Dept Earth Sci, Los Angeles, CA USA

[3] Univ S Carolina, Dept Earth & Ocean Sci, Columbia, SC 29208 USA

[4] Oregon State Univ, Coll Earth Ocean & Atmospher Sci, Corvallis, OR 97331 USA

[5] Univ Washington, Sch Oceanog, US Geol Survey, Seattle, WA 98195 USA

[6] Georgia Inst Technol, Sch Earth & Atmospher Sci, Atlanta, GA 30332 USA

[7] Ctr Invest Cient & Educ Super Ensenada, Dept Oceanog Biol, Ensenada, Baja California, Mexico

[8] Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY USA

[9] CUNY, Kingsborough Community Coll, Dept Phys Sci, New York, NY 10021 USA

来源：

SCIENCE | 2014年 / 345卷 / 6197期

基金：

美国国家科学基金会;

关键词：

ARABIAN SEA; OCEAN; DENITRIFICATION; VARIABILITY; HYPOXIA; PRESERVATION; CIRCULATION; DIAGENESIS; SEDIMENTS; DRIVEN;

D O I：

10.1126/science.1252332

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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 (delta N-15) from multiple sediment cores. Increasing delta N-15 since similar to 1990 records an expansion of anoxia, consistent with observed O-2 trends. However, this was preceded by a longer declining delta N-15 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.

引用

页码：665 / 668

页数：5

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