DOI: 10.1007/s00382-014-2065-0
Scopus记录号: 2-s2.0-84893706455
论文题名: Oxygen variance and meridional oxygen supply in the Tropical North East Atlantic oxygen minimum zone
作者: Hahn J. ; Brandt P. ; Greatbatch R.J. ; Krahmann G. ; Körtzinger A.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2014
卷: 43, 期: 11 起始页码: 2999
结束页码: 3024
语种: 英语
英文关键词: Eddy ventilation
; Oxygen budget
; Oxygen minimum zone
; Oxygen supply
; Oxygen variance
; Tropical North East Atlantic
英文摘要: The distribution of the mean oceanic oxygen concentration results from a balance between ventilation and consumption. In the eastern tropical Pacific and Atlantic, this balance creates extended oxygen minimum zones (OMZ) at intermediate depth. Here, we analyze hydrographic and velocity data from shipboard and moored observations, which were taken along the 23°W meridian cutting through the Tropical North East Atlantic (TNEA) OMZ, to study the distribution and generation of oxygen variability. By applying the extended Osborn–Cox model, the respective role of mesoscale stirring and diapycnal mixing in producing enhanced oxygen variability, found at the southern and upper boundary of the OMZ, is quantified. From the well-ventilated equatorial region toward the OMZ core a northward eddy-driven oxygen flux is observed whose divergence corresponds to an oxygen supply of about 2.4 μmol kg−1 year−1 at the OMZ core depth. Above the OMZ core, mesoscale eddies act to redistribute low- and high-oxygen waters associated with westward and eastward currents, respectively. Here, absolute values of the local oxygen supply >10 μmol kg−1 year−1 are found, likely balanced by mean zonal advection. Combining our results with recent studies, a refined oxygen budget for the TNEA OMZ is derived. Eddy-driven meridional oxygen supply contributes more than 50 % of the supply required to balance the estimated oxygen consumption. The oxygen tendency in the OMZ, as given by the multidecadal oxygen decline, is maximum slightly above the OMZ core and represents a substantial imbalance of the oxygen budget reaching about 20 % of the magnitude of the eddy-driven oxygen supply. © 2014, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54352
Appears in Collections: 过去全球变化的重建
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作者单位: GEOMAR Helmholtz-Centre for Ocean Research Kiel, Düsternbrooker Weg 20, Kiel, Germany
Recommended Citation:
Hahn J.,Brandt P.,Greatbatch R.J.,et al. Oxygen variance and meridional oxygen supply in the Tropical North East Atlantic oxygen minimum zone[J]. Climate Dynamics,2014-01-01,43(11)