气候变化领域集成服务门户(CCPortal): Oxygen Saturation Surrounding Deep Water Formation Events in the Labrador Sea From Argo-O2 Data

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DOI	10.1002/2017GB005829
	Oxygen Saturation Surrounding Deep Water Formation Events in the Labrador Sea From Argo-O2 Data
	Wolf M.K.; Hamme R.C.; Gilbert D.; Yashayaev I.; Thierry V.
发表日期	2018
ISSN	0886-6236
EISSN	1944-9224
起始页码	635
结束页码	653
卷号	32 期号:4
英文摘要	Deep water formation supplies oxygen-rich water to the deep sea, spreading throughout the ocean by means of the global thermohaline circulation. Models suggest that dissolved gases in newly formed deep water do not come to equilibrium with the atmosphere. However, direct measurements during wintertime convection are scarce, and the controls over the extent of these disequilibria are poorly quantified. Here we show that, when convection reached deeper than 800 m, oxygen in the Labrador Sea was consistently undersaturated at −6.1% to −7.6% at the end of convection. Deeper convection resulted in greater undersaturation, while convection ending later in the year resulted in values closer to equilibrium, from which we produce a predictive relationship. We use dissolved oxygen data from six profiling Argo floats in the Labrador Sea between 2003 and 2016, allowing direct observations of wintertime convection. Three of the six optode oxygen sensors displayed substantial average in situ drift of −3.03 μmol O2 kg−1 yr−1 (−0.94% O2 yr−1), which we corrected to stable deepwater oxygen values from repeat ship surveys. Observations of low oxygen intrusions during restratification and a simple mixing calculation demonstrate that lateral processes act to lower the oxygen inventory of the central Labrador Sea. This suggests that the Labrador Sea is a net sink for atmospheric oxygen, but uncertainties in parameterizing gas exchange limit our ability to quantify the net uptake. Our results constrain the oxygen concentration of newly formed Labrador Sea Water and allow more precise estimates of oxygen utilization and nutrient regeneration in this water mass. ©2018. American Geophysical Union. All Rights Reserved.
英文关键词	Argo; convection; deep water formation; Labrador Sea; oxygen saturation
语种	英语
scopus关键词	Argo; atmospheric convection; deep water; disequilibrium; dissolved oxygen; gas exchange; parameterization; prediction; saturation; thermohaline structure; winter; Atlantic Ocean; Labrador Sea
来源期刊	Global Biogeochemical Cycles
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129834
作者单位	School of Earth and Ocean Sciences, University of Victoria, Victoria, BC, Canada; Maurice-Lamontagne Institute, Fisheries and Oceans Canada, Mont-Joli, QC, Canada; Bedford Institute of Oceanography, Fisheries and Oceans Canada, Dartmouth, NS, Canada; Ifremer, Laboratoire d'Océanographie Physique et Spatiale, Plouzané, France
推荐引用方式 GB/T 7714	Wolf M.K.,Hamme R.C.,Gilbert D.,et al. Oxygen Saturation Surrounding Deep Water Formation Events in the Labrador Sea From Argo-O2 Data[J],2018,32(4).
APA	Wolf M.K.,Hamme R.C.,Gilbert D.,Yashayaev I.,&Thierry V..(2018).Oxygen Saturation Surrounding Deep Water Formation Events in the Labrador Sea From Argo-O2 Data.Global Biogeochemical Cycles,32(4).
MLA	Wolf M.K.,et al."Oxygen Saturation Surrounding Deep Water Formation Events in the Labrador Sea From Argo-O2 Data".Global Biogeochemical Cycles 32.4(2018).