DOI: 10.1002/2016GB005507
Scopus记录号: 2-s2.0-85018952055
论文题名: Ventilation versus biology: What is the controlling mechanism of nitrous oxide distribution in the North Atlantic?
作者: de la Paz M ; , García-Ibáñez M ; I ; , Steinfeldt R ; , Ríos A ; F ; , Pérez F ; F
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2017
卷: 31, 期: 4 起始页码: 745
结束页码: 760
语种: 英语
英文关键词: nitrous oxide
; North Atlantic Ocean
; ocean ventilation
; oxygen
Scopus关键词: cold water
; global ocean
; isopycnal layer
; meridional circulation
; nitrogen cycle
; nitrous oxide
; ocean basin
; open ocean
; oxygen
; water mass
; Arctic
; Atlantic Ocean
; Atlantic Ocean (North)
; Greenland
; Portugal
英文摘要: The extent to which water mass mixing and ocean ventilation contribute to nitrous oxide (N2O) distribution at the scale of oceanic basins is poorly constrained. We used novel N2O and chlorofluorocarbon measurements along with multiparameter water mass analysis to evaluate the impact of water mass mixing and Atlantic Meridional Overturning Circulation (AMOC) on N2O distribution along the Observatoire de la variabilité interannuelle et décennale en Atlantique Nord (OVIDE) section, extending from Portugal to Greenland. The biological N2O production has a stronger impact on the observed N2O concentrations in the water masses traveling northward in the upper limb of the AMOC than those in recently ventilated cold water masses in the lower limb, where N2O concentrations reflect the colder temperatures. The high N2O tongue, with concentrations as high as 16 nmol kg−1, propagates above the isopycnal surface delimiting the upper and lower AMOC limbs, which extends from the eastern North Atlantic Basin to the Iceland Basin and coincides with the maximum N2O production rates. Water mixing and basin-scale remineralization account for 72% of variation in the observed distribution of N2O. The mixing-corrected stoichiometric ratio N2O:O2 for the North Atlantic Basin of 0.06 nmol/μmol is in agreement with ratios of N2O:O2 for local N2O anomalies, suggesting than up to 28% of N2O production occurs in the temperate and subpolar Atlantic, an overlooked region for N2O cycling. Overall, our results highlight the importance of taking into account mixing, O2 undersaturation when water masses are formed and the increasing atmospheric N2O concentrations when parameterizing N2O:O2 and biological N2O production in the global oceans. ©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/77746
Appears in Collections: 气候变化事实与影响
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作者单位: Instituto de Investigaciones Marinas (CSIC), Vigo, Spain; Instituto Español de Oceanografía Centro Oceanográfico de A Coruña, A Coruña, Spain; Institute of Environmental Physics, University of Bremen, Bremen, Germany
Recommended Citation:
de la Paz M,, García-Ibáñez M,I,et al. Ventilation versus biology: What is the controlling mechanism of nitrous oxide distribution in the North Atlantic?[J]. Global Biogeochemical Cycles,2017-01-01,31(4)