Expanding Oxygen-Minimum Zones in the Tropical Oceans
摘要：
Oxygen-poor waters occupy large volumes of the intermediate-depth eastern tropical oceans. Oxygen-poor conditions have far-reaching impacts on ecosystems because important mobile macroorganisms avoid or cannot survive in hypoxic zones. Climate models predict declines in oceanic dissolved oxygen produced by global warming. We constructed 50-year time series of dissolved-oxygen concentration for select tropical oceanic regions by augmenting a historical database with recent measurements. These time series reveal vertical expansion of the intermediate-depth low-oxygen zones in the eastern tropical Atlantic and the equatorial Pacific during the past 50 years. The oxygen decrease in the 300- to 700-m layer is 0.09 to 0.34 micromoles per kilogram per year. Reduced oxygen levels may have dramatic consequences for ecosystems and coastal economies.
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关键词：
Theoretical or Mathematical/ global warming ocean temperature oceanographic regions seawater time series/ oxygen-minimum zones oxygen-poor water intermediate-depth eastern tropical ocean ecosystem mobile macroorganisms hypoxic zone oceanic dissolved oxygen global warming time series dissolved-oxygen concentration intermediate-depth low-oxygen zone eastern tropical Atlantic Ocean equatorial Pacific Ocean coastal economy/ A9220C Chemistry of the oceans A9210M Thermohaline structure and circulation of the oceans A9330M Atlantic Ocean A9330P Pacific Ocean
DOI：
10.1126/science.1153847
被引量：
年份：
2008
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