NORTH-ATLANTIC
; MINIMUM ZONES
; PHOSPHORUS
; MODEL
; PATTERNS
WOS学科分类:
Multidisciplinary Sciences
WOS研究方向:
Science & Technology - Other Topics
英文摘要:
Oceanic anoxic events have been associated with warm climates in Earth history, and there are concerns that current ocean deoxygenation may eventually lead to anoxia. Here we show results of a multi-millennial global-warming simulation that reveal, after a transitory deoxygenation, a marine oxygen inventory 6% higher than preindustrial despite an average 3 degrees C ocean warming. An interior-ocean oxygen source unaccounted for in previous studies explains two thirds of the oxygen excess reached after a few thousand years. It results from enhanced denitrification replacing part of today's ocean's aerobic respiration in expanding oxygen-deficient regions: The resulting loss of fixed nitrogen is equivalent to an oceanic oxygen gain and depends on an incomplete compensation of denitrification by nitrogen fixation. Elevated total oxygen in a warmer ocean with larger oxygen-deficient regions poses a new challenge for explaining global oceanic anoxic events and calls for an improved understanding of environmental controls on nitrogen fixation.
1.GEOMAR Helmholtz Ctr Ocean Res Kiel, Weg 20, D-24105 Kiel, Germany 2.Univ Kiel, D-24098 Kiel, Germany
Recommended Citation:
Oschlies, Andreas,Koeve, Wolfgang,Landolfi, Angela,et al. Loss of fixed nitrogen causes net oxygen gain in a warmer future ocean[J]. NATURE COMMUNICATIONS,2019-01-01,10