DOI: 10.1002/2017GB005633
Scopus记录号: 2-s2.0-85028954406
论文题名: Oceanic nitrogen cycling and N2O flux perturbations in the Anthropocene
作者: Landolfi A ; , Somes C ; J ; , Koeve W ; , Zamora L ; M ; , Oschlies A
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2017
卷: 31, 期: 8 起始页码: 1236
结束页码: 1255
语种: 英语
英文关键词: atmospheric N deposition
; climate change
; marine biogeochemical modeling
; marine export production
; marine N cycle
; oceanic N2O cycle
Scopus关键词: Anthropocene
; anthropogenic effect
; atmospheric deposition
; atmospheric forcing
; biogeochemical cycle
; biological production
; climate change
; climate modeling
; denitrification
; greenhouse gas
; marine environment
; nitrogen cycle
; nitrous oxide
; oceanic circulation
; organic matter
; oxygen minimum layer
; physicochemical property
; stratification
英文摘要: There is currently no consensus on how humans are affecting the marine nitrogen (N) cycle, which limits marine biological production and CO2 uptake. Anthropogenic changes in ocean warming, deoxygenation, and atmospheric N deposition can all individually affect the marine N cycle and the oceanic production of the greenhouse gas nitrous oxide (N2O). However, the combined effect of these perturbations on marine N cycling, ocean productivity, and marine N2O production is poorly understood. Here we use an Earth system model of intermediate complexity to investigate the combined effects of estimated 21st century CO2 atmospheric forcing and atmospheric N deposition. Our simulations suggest that anthropogenic perturbations cause only a small imbalance to the N cycle relative to preindustrial conditions (∼+5 Tg N y−1 in 2100). More N loss from water column denitrification in expanded oxygen minimum zones (OMZs) is counteracted by less benthic denitrification, due to the stratification-induced reduction in organic matter export. The larger atmospheric N load is offset by reduced N inputs by marine N2 fixation. Our model predicts a decline in oceanic N2O emissions by 2100. This is induced by the decrease in organic matter export and associated N2O production and by the anthropogenically driven changes in ocean circulation and atmospheric N2O concentrations. After comprehensively accounting for a series of complex physical-biogeochemical interactions, this study suggests that N flux imbalances are limited by biogeochemical feedbacks that help stabilize the marine N inventory against anthropogenic changes. These findings support the hypothesis that strong negative feedbacks regulate the marine N inventory on centennial time scales. ©2017. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77710
Appears in Collections: 气候变化事实与影响
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作者单位: GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel, Marine Biogeochemical Modelling, Kiel, Germany; Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD, United States; NASA Goddard Space Flight Center, Greenbelt, MD, United States
Recommended Citation:
Landolfi A,, Somes C,J,et al. Oceanic nitrogen cycling and N2O flux perturbations in the Anthropocene[J]. Global Biogeochemical Cycles,2017-01-01,31(8)