Quantifying seasonal air-sea gas exchange processes using noble gas time-series : a design experiment


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dc.contributor.author Stanley, Rachel H. R.
dc.contributor.author Jenkins, William J.
dc.contributor.author Doney, Scott C.
dc.date.accessioned 2007-02-09T17:15:48Z
dc.date.available 2007-02-09T17:15:48Z
dc.date.issued 2006-03
dc.identifier.citation Journal of Marine Research 64 (2006): 267-295 en
dc.identifier.uri http://hdl.handle.net/1912/1499
dc.description Author Posting. © Sears Foundation for Marine Research, 2006. This article is posted here by permission of Sears Foundation for Marine Research for personal use, not for redistribution. The definitive version was published in Journal of Marine Research 64 (2006): 267-295, doi:10.1357/002224006777606452. en
dc.description.abstract A multi-year time-series of measurements of five noble gases (He, Ne, Ar, Kr, and Xe) at a subtropical ocean location may allow quantification of air-sea gas exchange parameters with tighter constraints than is currently available by other methods. We have demonstrated this using a one-dimensional upper ocean model forced by 6-hourly NCEP reanalysis winds and heat flux for the Sargasso Sea near Bermuda. We performed ensemble model runs to characterize the response of the modeled noble gas saturation anomalies to a range of air-sea gas exchange parameters. We then used inverse calculations to quantify the sensitivity of the parameters to hypothetical observations. These calculations show that with currently achievable measurement accuracies, noble gas concentrations in the Sargasso Sea could be used to constrain the magnitude of equilibrium gas exchange to ±11%, the magnitude of the total air injection flux to ±14%, and the magnitude of net photosynthetic oxygen production to ±1.5 mol O2 m−2 y−1. Additionally, we can use noble gases to quantify the relative contributions of bubbles that are partially dissolved to bubbles that are completely dissolved. These constraints are based on idealized assumptions and may not fully account for some of the uncertainties in the meteorological data, in lateral transport processes, and in the solubilities of the noble gases. As a limited demonstration, we applied this approach to a time series of He, Ne, Ar, and O2 measurements from the Sargasso Sea from 1985 to 1988 (data from Spitzer, 1989). Due to the limited number of gases measured and the lower accuracy of those measurements, the constraints in this example application are weaker than could be achieved with current capabilities. en
dc.description.sponsorship This work was supported by the National Science Foundation Chemical Oceanography program (OCE-0221247) and by the Department of Defense (graduate fellowship to RHRS). en
dc.format.extent 1414370 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher Sears Foundation for Marine Research en
dc.relation.uri http://dx.doi.org/10.1357/002224006777606452
dc.title Quantifying seasonal air-sea gas exchange processes using noble gas time-series : a design experiment en
dc.type Article en
dc.identifier.doi 10.1357/002224006777606452

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