We thank Yann Bozec, for initial work on the mass spectrometer; Adam Cox, for assistance preparing gas cylinders; Todd Martz, for providing the optode; Yui Takeshita, for providing Winkler titration measurements; Roberta Hamme, for suggestions on ways to test the equilibrator; Mark Altabet for helpful discussions about building a gas tension device; and Angeline Ta, for help testing the gas tension device and equilibrator. We also thank three anonymous reviewers for their comments, which helped improve this manuscript. This material is based upon work supported by the National Science Foundation under Grant 0421546.
Angert, A., , Rachmilevitch S. , , Barkan E. , , and Luz B. , 2003: Effects of photorespiration, the cytochrome pathway, and the alternative pathway on the triple isotopic composition of atmospheric O2. Global Biogeochem. Cycles, 17, 1030, doi:10.1029/2002GB001933.
Bender, M. L., 1990: The δ18O of dissolved O2 in seawater: A unique tracer of circulation and respiration in the deep sea. J. Geophys. Res., 95 (C12), 22 243–22 252.
Bender, M. L., , and Grande K. D. , 1987: Production, respiration, and the isotope geochemistry of O2 in the upper water column. Global Biogeochem. Cycles, 1, 49–59.
Benson, B. B., , and Krause D. Jr., 1980: The concentration and isotopic fractionation of gases dissolved in freshwater in equilibrium with the atmosphere. 1. Oxygen. Limnol. Oceanogr., 25, 662–671.
Cassar, N., , Barnett B. A. , , Bender M. L. , , Kaiser J. , , Hamme R. C. , , and Tilbrook B. , 2009: Continuous high-frequency dissolved O2/Ar measurements by equilibrator inlet mass spectrometry. Anal. Chem., 81, 1855–1861.
Copin-Montegut, C., 1985: A method for the continuous determination of the partial pressure of carbon dioxide in the upper ocean. Mar. Chem., 17, 13–21.
Emerson, S., , Stump C. , , Wilbur D. , , and Quay P. , 1999: Accurate measurement of O2, N2 and Ar gases in water and the solubility of N2. Mar. Chem., 64, 337–347.
Frankignoulle, M., , Borges A. , , and Biondo R. , 2001: A new design of equilibrator to monitor carbon dioxide in highly dynamic and turbid environments. Water Res., 35, 1344–1347.
Guéguen, C., , and Tortell P. D. , 2008: High-resolution measurement of Southern Ocean CO2 and O2/Ar by membrane inlet mass spectrometry. Mar. Chem., 108, 184–194.
Hendricks, M. B., , Bender M. L. , , and Barnett B. A. , 2004: Net and gross O2 production in the Southern Ocean from measurements of biological O2 saturation and its triple isotope composition. Deep-Sea Res. I, 51, 1541–1561.
Johnson, J. E., 1999: Evaluation of a seawater equilibrator for shipboard analysis of dissolved oceanic trace gases. Anal. Chim. Acta, 395, 119–132.
Juranek, L. W., , and Quay P. D. , 2005: In vitro and in situ gross primary and net community production in the North Pacific Subtropical Gyre using labeled and natural abundance isotopes of dissolved O2. Global Biogeochem. Cycles, 19, GB3009, doi:10.1029/2004GB002384.
Kaiser, J., , Reuer M. K. , , Barnett B. , , and Bender M. L. , 2005: Marine productivity estimates from continuous O2/Ar ratio measurements by membrane inlet mass spectrometry. Geophys. Res. Lett., 32, L19605, doi:10.1029/2005GL023459.
Keeling, R. F., , Blaine T. , , Paplawsky B. , , Katz L. , , Atwood C. , , and Brockwell T. , 2004: Measurement of changes in atmospheric Ar/N2 ratio using a rapid-switching, single-capillary mass spectrometer system. Tellus, 56B, 322–338.
Knox, M., , Quay P. D. , , and Wilbur D. , 1992: Kinetic isotopic fractionation during air–water gas transfer of O2, N2, CH4, and H2. J. Geophys. Res., 97 (C12), 20 335–20 343.
Körtzinger, A., , Thomas H. , , Schneider B. , , Gronau N. , , Mintrop L. , , and Duinker J. C. , 1996: At-sea intercomparison of two newly designed underway pCO2 systems—Encouraging results. Mar. Chem., 52, 133–145.
Levine, N. M., , Bender M. L. , , and Doney S. C. , 2009: The δ18O of dissolved O2 as a tracer of mixing and respiration in the mesopelagic ocean. Global Biogeochem. Cycles, 23, GB1006, doi:10.1029/2007GB003162.
Luz, B., , and Barkan E. , 2000: Assessment of oceanic productivity with the triple-isotope composition of dissolved oxygen. Science, 288, 2028–2031.
McNeil, C., , Katz D. , , Wanninkhof R. , , and Johnson B. , 2005: Continuous shipboard sampling of gas tension, oxygen and nitrogen. Deep-Sea Res. I, 52, 1767–1785.
McNeil, C., , D’Asaro E. , , Johnson B. , , and Horn M. , 2006: A gas tension device with response times of minutes. J. Atmos. Oceanic Technol., 23, 1539–1558.
Murphy, P. P., , Nojiri Y. , , Fujinuma Y. , , Wong C. S. , , Zeng J. , , Kimoto T. , , and Kimoto H. , 2001: Measurements of surface seawater fCO2 from volunteer commercial ships: Techniques and experiences from Skaugran. J. Atmos. Oceanic Technol., 18, 1719–1734.
Quay, P. D., , Emerson S. , , Wilbur D. O. , , and Stump C. , 1993: The δ18O of dissolved O2 in the surface waters of the subarctic Pacific: A tracer of biological productivity. J. Geophys. Res., 98 (C5), 8447–8458.
Quiñones-Rivera, Z. J., , Wissel B. , , Justić D. , , and Fry B. , 2007: Partitioning oxygen sources and sinks in a stratified, eutrophic coastal ecosystem using stable oxygen isotopes. Mar. Ecol. Prog. Ser., 342, 69–83.
Reuer, M. K., , Barnett B. A. , , Bender M. L. , , Falkowski P. G. , , and Hendricks M. B. , 2007: New estimates of Southern Ocean biological production rates from O2/Ar ratios and the triple isotope composition of O2. Deep-Sea Res. I, 54, 951–974.
Sarma, V. V. S. S., , Abe O. , , Hashimoto S. , , Hinuma A. , , and Saino T. , 2005: Seasonal variations in triple oxygen isotopes and gross oxygen production in the Sagami Bay, central Japan. Limnol. Oceanogr., 50, 544–552.
Schneider, B., , Kremling K. , , and Duinker J. C. , 1992: CO2 partial pressure in northeast Atlantic and adjacent shelf water: Processes and seasonal variability. J. Mar. Syst., 3, 453–463.
Schneider, B., , Sadkowiak B. , , and Wachholz F. , 2007: A new method for continuous measurements of O2 in surface water in combination with pCO2 measurements: Implications for gas phase equilibration. Mar. Chem., 103, 163–171.
Stanley, R. H. R., , Kirkpatrick J. B. , , Cassar N. , , Barnett B. A. , , and Bender M. L. , 2010: Net community production and gross primary production rates in the western equatorial Pacific. Global Biogeochem. Cycles, 24, GB4001, doi:10.1029/2009GB003651.
Thiemens, M. H., , Jackson T. , , Zipf E. C. , , Erdman P. W. , , and van Egmond C. , 1995: Carbon dioxide and oxygen isotope anomalies in the mesosphere and stratosphere. Science, 270, 969–972.
Tortell, P. D., 2005: Dissolved gas measurements in oceanic waters made by membrane inlet mass spectrometry. Limnol. Oceanogr. Methods, 3, 24–37.