Climate-Forced Variability of Ocean Hypoxia

被引：277

作者：

Deutsch, Curtis ^{[1
]}

Brix, Holger ^{[1
]}

Ito, Taka ^{[2
]}

Frenzel, Hartmut ^{[1
]}

Thompson, LuAnne ^{[3
]}

机构：

[1] Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90095 USA

[2] Colorado State Univ, Dept Atmospher Sci, Ft Collins, CO 80523 USA

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

来源：

SCIENCE | 2011年 / 333卷 / 6040期

基金：

美国国家科学基金会;

关键词：

NORTH PACIFIC; ARABIAN SEA; DENITRIFICATION; NITROGEN; RATIOS; WATERS;

D O I：

10.1126/science.1202422

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：

Oxygen (O-2) is a critical constraint on marine ecosystems. As oceanic O-2 falls to hypoxic concentrations, habitability for aerobic organisms decreases rapidly. We show that the spatial extent of hypoxia is highly sensitive to small changes in the ocean's O-2 content, with maximum responses at suboxic concentrations where anaerobic metabolisms predominate. In model-based reconstructions of historical oxygen changes, the world's largest suboxic zone, in the Pacific Ocean, varies in size by a factor of 2. This is attributable to climate-driven changes in the depth of the tropical and subtropical thermocline that have multiplicative effects on respiration rates in low-O-2 water. The same mechanism yields even larger fluctuations in the rate of nitrogen removal by denitrification, creating a link between decadal climate oscillations and the nutrient limitation of marine photosynthesis.

引用

页码：336 / 339

页数：4

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