Revising estimates of aquatic gross oxygen production by the triple oxygen isotope method to incorporate the local isotopic composition of water
Manning, Cara C.
Howard, Evan M.
Nicholson, David P.
Ji, Brenda Y.
Sandwith, Zoe O.
Stanley, Rachel H. R.
MetadataShow full item record
Measurement of the triple oxygen isotope (TOI) composition of O2 is an established method for quantifying gross oxygen production (GOP) in natural waters. A standard assumption to this method is that the isotopic composition of H2O, the substrate for photosynthetic O2, is equivalent to Vienna standard mean ocean water (VSMOW). We present and validate a method for estimating the TOI composition of H2O based on mixing of local meteoric water and seawater H2O end-members, and incorporating the TOI composition of H2O into GOP estimates. In the ocean, GOP estimates based on assuming the H2O is equivalent to VSMOW can have systematic errors of up to 48% and in low-salinity systems, errors can be a factor of 2 or greater. In future TOI-based GOP studies, TOI measurements of O2 and H2O should be paired when the H2O isotopic composition is expected to differ from VSMOW.
Author Posting. © American Geophysical Union, 2017. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 44 (2017): 10511-10519, doi:10.1002/2017GL074375.
Suggested CitationGeophysical Research Letters 44 (2017): 10511-10519
Showing items related by title, author, creator and subject.
Changes in gross oxygen production, net oxygen production, and air-water gas exchange during seasonal ice melt in Whycocomagh Bay, a Canadian estuary in the Bras d'or Lake system Manning, Cara C.; Stanley, Rachel H. R.; Nicholson, David P.; Loose, Brice; Lovely, Ann; Schlosser, Peter; Hatcher, Bruce G. (European Geosciences Union, 2019-09-05)Sea ice is an important control on gas exchange and primary production in polar regions. We measured net oxygen production (NOP) and gross oxygen production (GOP) using near-continuous measurements of the O2∕Ar gas ratio ...
Evaluating triple oxygen isotope estimates of gross primary production at the Hawaii Ocean Time-series and Bermuda Atlantic Time-series Study sites Nicholson, David P.; Stanley, Rachel H. R.; Barkan, Eugeni; Karl, David M.; Luz, Boaz; Quay, Paul D.; Doney, Scott C. (American Geophysical Union, 2012-05-08)The triple oxygen isotopic composition of dissolved oxygen (17Δ) is a promising tracer of gross oxygen productivity (P) in the ocean. Recent studies have inferred a high and variable ratio of P to 14C net primary productivity ...
Comment on: "Technical note: Consistent calculation of aquatic gross production from oxygen triple isotope measurements" by Kaiser (2011) Nicholson, David P. (Copernicus Publications on behalf of the European Geosciences Union, 2011-10-27)Kaiser (2011) has introduced an improved method for calculating gross productivity from the triple isotopic composition of dissolved oxygen in aquatic systems. His equation avoids approximations of previous methodologies, ...