气候变化领域集成服务门户(CCPortal): Accurate Estimation of Net Community Production From O2/Ar Measurements

CCPortal

DOI	10.1029/2017GB005874
	Accurate Estimation of Net Community Production From O2/Ar Measurements
	Teeter L.; Hamme R.C.; Ianson D.; Bianucci L.
发表日期	2018
ISSN	0886-6236
EISSN	1944-9224
起始页码	1163
结束页码	1181
卷号	32 期号:8
英文摘要	Under physically isolated conditions, net community production (NCP) can be accurately estimated from the rate of oxygen evasion to the atmosphere derived from local mixed layer oxygen/argon measurements. We use a simple box model to demonstrate that, when physical inputs are negligible, the sea-to-air flux of biological oxygen (bioflux) represents the average NCP exponentially weighted over the past several residence times of oxygen in the mixed layer. This new weighting scheme shows that there is no apparent lag between bioflux and exponentially weighted time-averaged NCP. Furthermore, a strict steady state assumption is unnecessary to this relationship. However, this widely used O2/Ar method is not effective in dynamic coastal zones where low oxygen water upwells to the surface. Yet these zones are highly productive and their episodic productivity needs to be quantified. We use a quasi-2-D version of the Regional Ocean Modeling System, including oxygen and argon as prognostic variables, to explore the application of this method and the relationship between NCP and bioflux in a coastal upwelling system. We show that bioflux is an accurate measure of NCP over large regions of time and space. Bioflux is most biased near the shore following upwelling favorable winds, where bioflux is sometimes negative (flux from the atmosphere to the ocean) and even positive bioflux values can severely underestimate NCP. Assessing a range of model variables that are easily observed in the field, we show that sea surface temperature is the most effective at identifying bioflux measurements that are likely to be biased. ©2018. American Geophysical Union. All Rights Reserved.
英文关键词	coastal upwelling; dissolved gases; numerical modeling; ocean productivity; oxygen/argon; productivity methods
语种	英语
scopus关键词	accuracy assessment; air-sea interaction; argon; coastal zone; dissolved gas; mixed layer; numerical model; oxygen; sea surface temperature; steady-state equilibrium; upwelling
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/129807
作者单位	Department of Earth and Ocean Sciences, University of Victoria, Victoria, BC, Canada; Now at Canadian Hydrographic Service, Fisheries and Oceans Canada, Sidney, BC, Canada; Institute of Ocean Sciences, Fisheries and Oceans Canada, Sidney, BC, Canada
推荐引用方式 GB/T 7714	Teeter L.,Hamme R.C.,Ianson D.,et al. Accurate Estimation of Net Community Production From O2/Ar Measurements[J],2018,32(8).
APA	Teeter L.,Hamme R.C.,Ianson D.,&Bianucci L..(2018).Accurate Estimation of Net Community Production From O2/Ar Measurements.Global Biogeochemical Cycles,32(8).
MLA	Teeter L.,et al."Accurate Estimation of Net Community Production From O2/Ar Measurements".Global Biogeochemical Cycles 32.8(2018).