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Original Research Papers

Can bottom-up ocean CO2 fluxes be reconciled with atmospheric 13C observations?

Authors:

Caroline B. Alden,

Institute of Arctic and Alpine Research, University of Colorado, Boulder, CO 80309, US
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John B. Miller ,

National Oceanic & Atmospheric Administration Earth Systems Research Laboratory (NOAA/ESRL), 325 Broadway, Boulder, CO 80305; Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado, Boulder, CO 80309, US
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James W.C. White

Institute of Arctic and Alpine Research, University of Colorado, Boulder, CO 80309, US
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Abstract

The rare stable carbon isotope, 13C, has been used previously to partition CO2 fluxes into land and ocean components. Net ocean and land fluxes impose distinctive and predictable fractionation patterns upon the stable isotope ratio, making it an excellent tool for distinguishing between them. Historically, isotope constrained inverse methods for calculating CO2 surface fluxes—the ‘double deconvolution’—have disagreed with bottom-up ocean flux estimates. In this study, we use the double deconvolution framework, but add, as a constraint, independent estimates of time histories of ocean fluxes to the atmospheric observations of CO2 and 13CO2. We calculate timeseries of net land flux, total disequilibrium flux and terrestrial disequilibrium flux from 1991 to 2008 that are consistent with bottom-up net ocean fluxes.We investigate possible drivers of interannual variability in terrestrial disequilibrium flux, including terrestrial discrimination, and test the sensitivity of our results to those mechanisms. We find that C3 plant discrimination and shifts in the global composition of C3 and C4 vegetation are likely drivers of interannual variability in terrestrial disequilibrium flux, while contributions from heterotrophic respiration and disturbance anomalies are also possible.

How to Cite: Alden, C.B., Miller, J.B. and White, J.W.C., 2010. Can bottom-up ocean CO2 fluxes be reconciled with atmospheric 13C observations?. Tellus B: Chemical and Physical Meteorology, 62(5), pp.369–388. DOI: http://doi.org/10.1111/j.1600-0889.2010.00481.x
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  Published on 01 Jan 2010
 Accepted on 8 Jun 2010            Submitted on 1 Jan 2010

References

  1. BP Statistical Review of World Energy June. 2009 . www.bp.com/statisticalreview.  

  2. Bacastow , R. B . 1976 . Modulation of atmospheric carbon-dioxide by southern oscillation . Nature 261 , 116 – 118 .  

  3. Baker , D. F. , Law , R. M. , Gurney , K. R. , Rayner , P. , Peylin , P. and co-authors . 2006 . TransCom 3 inversion intercomparison: impact of transport model errors on the interannual variability of regional CO2 fluxes, 1988 - 2003 . Global Biogeochem. Cycles 20 , GB1002 , doi: https://doi.org/10.1029/2004GB002439 .  

  4. Battle , M. , Bender , M. L. , Tans , P. P. , White , J. W. C. , Ellis , J. T. and co-authors . 2000 . Global carbon sinks and their variability inferred from atmospheric 02 and delta C-13. Science 287 , 2467 - 2470 .  

  5. Bender , M. L. , Ho , D. T. , Hendricks , M. B. , Mika , R. , Battle , M. O. and co-authors . 2005 . Atmospheric 02/N2 changes, 1993-2002: im-plications for the partitioning of fossil fuel CO2 sequestration. Global Biogeochem. Cycles 19 , GB4017 , doi: https://doi.org/10.1029/2004GB002410 .  

  6. Boden , T. A. , Marland , G. and Andres , R. J . 2009 . Global, regional, and national fossil-fuel CO2 emissions. Carbon Dioxide Information Analysis Center, Oak Ridge National Laboratory, U.S. Department of Energy, Oak Ridge, TN, U.S.A., doi: https://doi.org/10.3334/CDIAC/00001 .  

  7. Bousquet, R , Peylin, R , Ciais , P. , Le Quere , C. , Friedlingstein , P. and co-authors . 2000 . Regional changes in carbon dioxide fluxes of land and oceans since 1980. Science 290 , 1342 - 1346 .  

  8. Bowling , D. R. , McDowell , N. G. , Bond , B. J. , Law , B. E. and Ehleringer , J. R . 2002 . C-13 content of ecosystem respiration is linked to precip-itation and vapor pressure deficit. Oecologia 131 , 113 - 124 .  

  9. Buitenhuis , E. , Le Quere , C. , Aumont , O. , Beaugrand , G. , Bunker , A. and co-authors . 2006 . Biogeochemical fluxes through mesozooplankton. Global Biogeochem. Cycles 20 , GB2003 , doi: https://doi.org/10.1029/2005GB002511 .  

  10. Canadell , J. G. , Le Quere , C. , Raupach , M. R. , Field , C. B. , Buitenhuis , E. T. and co-authors . 2007 . Contributions to accelerating atmospheric CO2 growth from economic activity, carbon intensity, and efficiency of natural sinks. Proc. Natl. Acad. Sci. USA 104 , 18866 - 18870 .  

  11. Chavez , F.R, Strutton , P. G. , Friederich , C. E. , Feely , R. A. , Feldman , G. C. and co-authors . 1999 . Biological and chemical response of the equatorial Pacific Ocean to the 1997-98 El Nino. Science 286 , 2126 - 2131 .  

  12. Ciais , R , Tans , P. P. , White , J. W. C. , Trolier , M. , Francey , R. J. and co-authors . 1995 . Partitioning of ocean and land uptake of CO2 as inferred by delta C-13 measurements from the NOAA climate monitoring and diagnostics laboratory global air sampling network. J. Geophys. Res.-Atmos . 100 , 5051 - 5070 .  

  13. Ciais , P. , Friedlingstein , R , Schimel , D. S. and Tans , P. P. 1999. A global calculation of the delta C-13 of soil respired carbon: implications for the biospheric uptake of anthropogenic CO2. Global Biogeochem. Cycles 13 , 519 - 530 .  

  14. Collatz , G. J. , Ball , J. T. , Grivet , C. and Berry , J. A . 1991 . Physiological and environmental-regulation of stomatal conductance, photosynthe-sis and transpiration - a model that includes a laminar boundary-layer . Agric. Forest Meteorol . 54 , 107 – 136 .  

  15. Conway , T. J. , Tans , P. P. , Waterman , L. S. and Thoning , K. W. 1994. Evidence for interannual variability of the carbon-cycle from the national-oceanic-and-atmospheric-administration climate-monitoring-and-diagnostics-laboratory global-air-sampling-network. J. Geophys. Res.-Atmos . 99 , 22831 - 22855 .  

  16. DeFries , R. S. , Houghton , R. A. , Hansen , M. C. , Field , C. B. , Skole , D. and co-authors . 2002 . Carbon emissions from tropical deforestation and regrowth based on satellite observations for the 1980s and 1990s. Proc. Natl. Acad. Sci. USA 99 , 14256 - 14261 .  

  17. Denman , K. L. , Brasseur , G. , Chidthaisong , A. , Ciais , P. , Cox , P. M. and co-authors . 2007 . Couplings between changes in the climate sys-tem and biogeochemistry. In: Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth As-sessment report of the Intergovernmental Panel on Climate Change (eds S., Solomon , D., Qin , M., Manning , Z., Chen , M., Marquis , and co-authors ). Cambridge, United Kingdom, New York, NY, USA, 500 - 587 .  

  18. Doney , S. C. , Tilbrook , B. , Roy , S. , Metzl , N. , Le Quere , C. and co-authors . 2009a . Surface-ocean CO2 variability and vulnerability. Deep-Sea Res. Part II-Topical Stud. Oceanogr 56 , 504 - 511 .  

  19. Doney , S. C. , Lima , I. , Feely , R. A. , Glover , D. M. , Lindsay , K. and co-authors . 2009b . Mechanisms governing interannual variability in upper-ocean inorganic carbon system and air-sea CO2 fluxes: physical climate and atmospheric dust. Deep-Sea Res. Part II-Topical Stud. Oceanogr 56 , 640 - 655 .  

  20. Enting , I. G. , Trudinger , C. M. , Francey , R. J. and Granek , H . 1993 . Syn-thesis inversion of atmospheric CO2 using the GISS tracer transport model . AusL Div. Atmos. Res. Tech. Pap . 29 , 1 – 44 .  

  21. Enting , I. G. , Trudinger , C. M. and Francey , R. J . 1995 . A synthesis inversion of the concentration and delta C-13 of atmospheric CO2 . Tellus 47B , 35 – 52 .  

  22. Etheridge , D. M. , Steele , L. P. , Langenfelds , R. L. , Francey , R. J. , Barnola , J. M. and co-authors . 1996 . Natural and anthropogenic changes in atmospheric CO2 over the last 1000 years from air in Antarctic ice and firn. J. Geophys. Res.-Atmos . 101 , 4115 - 4128 .  

  23. Farquhar , G. D. , Oleary , M. H. and Berry , J. A . 1982 . On the relationship between carbon isotope discrimination and the inter-cellular carbon-dioxide concentration in leaves . Aust. J. Plant PhysioL 9 , 121 – 137 .  

  24. Farquhar , G. D. , Ehleringer , J. R. and Hubick , K. T . 1989 . Carbon isotope discrimination and photosynthesis . Ann. Rev. Plant PhysioL Plant Molec. Biol . 40 , 503 – 537 .  

  25. Francey , R. J . 1985 . Cape grim isotope measurements - a preliminary assessment . J. Atmos. Chem . 3 , 247 – 260 .  

  26. Francey , R. J. , Tans , P. P. , Allison , C. E. , Enting , I. G. , White , J. W. C. and co-authors . 1995 . Changes in oceanic and terrestrial carbon uptake since 1982. Nature 373 , 326 - 330 .  

  27. Francey , R. J. , Allison , C. E. , Etheridge , D. M. , Trudinger , C. M. , Enting , I. G. and co-authors . 1999 . A 1000-year high precision record of delta C-13 in atmospheric CO2. Tellus 51B , 170 - 193 .  

  28. Fung , I. , Field , C. B. , Berry , J. A. , Thompson , M. V. , Randerson , J. T. and co-authors . 1997 . Carbon 13 exchanges between the atmosphere and biosphere. Global Biogeochem. Cycles 11 , 507 - 533 .  

  29. Gruber , N. , Keeling , C. D. , Bacastow , R. B. , Guenther , P. R. , Lueker , T. J. and co-authors . 1999 . Spatiotemporal patterns of carbon-13 in the global surface oceans and the oceanic Suess Effect. Global Bio-geochem. Cycles 13 , 307 - 335 .  

  30. Houghton , R. A . 2003 . Revised estimates of the annual net flux of carbon to the atmosphere from changes in land use and land management 1850-2000 . Tellus 55B , 378 – 390 .  

  31. Joos , E. and Bruno , M. 1998 . Long-term variability of the terrestrial and oceanic carbon sinks and the budgets of the carbon isotopes C-13 and C-14 . Global Biogeochem. Cycles 12 , 277 – 295 .  

  32. Kaplan , J O. , Prentice , I. C. and Buchmann , N. 2002. The stable carbon isotope composition of the terrestrial biosphere: modeling at scales from the leaf to the globe. Global Biogeochem. Cycles 16 , 1060 - 1071 .  

  33. Keeling, C. D. 1960. The concentration and isotopic abundances of carbon dioxide in the atmosphere. Tellus 12 , 200 - 203 .  

  34. Keeling , C. D . 1979 . The Suess Effect: 13Carbon-14Carbon interrela-tions . Environ. Int . 2 , 229 – 300 .  

  35. Keeling , C D. , Bastacow , R. B. , Carter , A. F. , Piper , S. C. , Whorf , T. P. and co-authors . 1989 . A three-dimensional model of atmospheric CO2 transport based on observed winds: analysis of observational data. In: Aspects of climate variability in the Pacific and the Western Americas (ed. D. H., Peterson ). American Geophysical Union, Washington, DC, 165 - 236 .  

  36. Keeling , C D. , Whorf , T. P. , Wahlen , M. and Vanderplicht , J. 1995. Interannual extremes in the rate of rise of atmospheric carbon dioxide since 1980. Nature 375 , 666 - 670 .  

  37. Knapp , A. K. and Smith , M. D . 2001 . Variation among biomes in tem-poral dynamics of aboveground primary production . Science 291 , 481 – 484 .  

  38. Krakauer , N. Y. , Randerson , J. T. , Primeau , F. W. , Gruber , N. and Menemenlis , D . 2006 . Carbon isotope evidence for the latitudinal distribution and wind speed dependence of the air-sea gas transfer velocity . Tellus 58B , 390 – 417 .  

  39. Lambers , H. , Chapin , F. S. and Pons , T. L. 1998. Plant Physiological Ecology . Springer , New York , 70 - 71 .  

  40. Langenfelds , R. L. , Francey , R. J. , Pak , B. C. , Steele , L P. , Lloyd, J. and co-authors . 2002 . Interannual growth rate variations of atmo-spheric CO2 and its delta C-13, H2, CH4, and CO between 1992 and 1999 linked to biomass burning. Global Biogeochem. Cycles 16 , 1048 - 1069 .  

  41. Le Quere , C. , Aumont , O. , Bopp , L. , Bousquet , P. , Ciais , P. and co-authors . 2003 . Two decades of ocean CO2 sink and variability. Tellus 55B , 649 - 656 .  

  42. Le Quere , C. , Rödenbeck , C. , Buitenhuis , E. T. , Conway , T. J. , Langenfelds , R. and co-authors . 2007 . Saturation of the Southern Ocean CO2 sink due to recent climate change . Science 316 , 1735– 1738 .  

  43. Le Quere , C. , Raupach , M. R. , Canadell , J. G. , Marland , G. , Bopp , L. and co-authors . 2009 . Trends in the sources and sinks of carbon dioxide. Nature Geosci . 2 , 831 - 836 .  

  44. Lee , K. , Wanninlchof , R. , Takahashi , T. , Doney , S. C. and Feely , R. A . 1998 . Low interannual variability in recent oceanic uptake of atmo-spheric carbon dioxide . Nature 396 , 155 – 159 .  

  45. Lloyd , J. and Farquhar , G. D . 1994 . C-13 discrimination during CO2 assimilation by the terrestrial biosphere. Oecologia 99 , 201 - 215 .  

  46. Masarie , K. A. and Tans , P. P. 1995. Extension and integration of atmo-spheric carbon-dioxide data into a globally consistent measurement record . J. Geophys. Res.-Atmos . 100 , 11593 – 11610 .  

  47. Matsumoto , K. , Sarmiento , J. L. , Key , R. M. , Aumont , O. , Bullis-ter , J. L. and co-authors . 2004 . Evaluation of ocean carbon cycle models with data-based metrics. Geophys. Res. Lett . 31 , L07303 , doi: https://doi.org/10.1029/2003GL018970 .  

  48. Morimoto , S. , Nakazawa , T. , Higuchi , K. and Aoki , S . 2000 . Latitudinal distribution of atmospheric CO2 sources and sinks inferred by delta C-13 measurements from 1985 to 1991 . J. Geophys. Res.-Atmos . 105 , 24315 – 24326 .  

  49. Naegler , T. , Ciais , P. , Rodgers , K. and Levin , I. 2006. Excess radiocarbon constraints on air-sea gas exchange and the uptake of CO2 by the oceans. Geophys. Res. Lett . 33 , L11802 , doi: https://doi.org/10.1029/2005GL025408.  

  50. O'leary, M. H. 1988. Carbon isotopes in photosynthesis. Bioscience 38 , 328 - 336 .  

  51. Obata , A. and Kitamura , Y . 2003 . Interannual variability of the sea-air exchange of CO2 from 1961 to 1998 simulated with a global ocean circulation-biogeochemistry model . J. Geophys. Res.-Oceans 108 , 3337 – 3351 .  

  52. Olsen , A. , Wanninlchof , R. , Trinanes , J. A. and Johannessen , T . 2005 . The effect of wind speed products and wind speed-gas exchange relationships on interannual variability of the air-sea CO2 gas transfer velocity . Tellus 57B , 95 – 106 .  

  53. Ometto , J. , Flanagan , L. B. , Martinelli , L. A. , Moreira , M. Z. , Higuchi , N. and co-authors . 2002 . Carbon isotope discrimination in forest and pasture ecosystems of the Amazon Basin, Brazil. Global Biogeochem. Cycles 16 , 1109 - 1118 .  

  54. Orr , J. C. , Maier-Reimer , E. , Mikolajewicz , U. , Monfray , P. , Sarmiento , J. L. and co-authors . 2001 . Estimates of anthropogenic carbon up-take from four three-dimensional global ocean models. Global Bio-geochem. Cycles 15 , 43 - 60 .  

  55. Page , S. E. , Siegert , F. , Rieley , J O. , Boehm , H. D. V Jaya , A. and co-authors . 2002 . The amount of carbon released from peat and forest fires in Indonesia during 1997. Nature 420 , 61 - 65 .  

  56. Park , G H. , Lee , K. , Wanninkhof , R. and Feely , R. A. 2006. Empirical temperature-based estimates of variability in the oceanic uptake of CO2 over the past 2 decades. J. Geophys. Res.-Oceans 111 , C07507 , doi: https://doi.org/10.1029/2005JC003090 .  

  57. Park , G H. , Wanninlchof , R. , Doney , S. C. , Takahashi , T. , Lee , K. and co-authors . 2010 . Variability of the global net sea-air CO2 fluxes over the last three decades using empirical relationships. Tellus B , doi: https://doi.org/10.1111/j.1600-0889.2010.00498.x .  

  58. Pataki , D. E. , Ehleringer , J. R. , Flanagan , L. B. , Yakir , D. , Bowling , D. R. and co-authors . 2003 . The application and interpretation of Keeling plots in terrestrial carbon cycle research. Global Biogeochem. Cycles 17 , 1022 - 1035 .  

  59. Peters , W. , Jacobson , A. R. , Sweeney , C. , Andrews , A. E. , Conway , T. J. and co-authors . 2007 . An atmospheric perspective on North American carbon dioxide exchange: CarbonTracker. Proc. Natl. Acad. Sci. USA 104 , 18925 - 18930 .  

  60. Quay , P. D. , Tilbrook , B. and Wong , C. S. 1992. Oceanic uptake of fossil-fuel CO2—C-13 evidence. Science 256 , 74 - 79 .  

  61. Randerson , J. T. , Collatz , G. J. , Fessenden , J. E. , Munoz , A. D. , Still , C. J. and co-authors . 2002 . A possible global covariance between terres-trial gross primary production and C-13 discrimination: consequences for the atmospheric C-13 budget and its response to ENSO. Global Biogeochem. Cycles 16 , 1136 - 1151 .  

  62. Randerson , J. T. , Van Der Werf , G. R. , Collatz , G. J. , Giglio , L. , Still , C. J. and co-authors . 2005 . Fire emissions from C-3 and C-4 veg-etation and their influence on interannual variability of atmospheric CO2 and delta(CO2)-C-13. Global Biogeochem. Cycles 19 , GB2019 , doi: https://doi.org/10.1029/2004GB002366 .  

  63. Rayner , P. J. , Law , R. M. and Dargaville , R . 1999 . The relationship between tropical CO2 fluxes and the El Niiio -Southern Oscillation . Geophys. Res. Lett . 26 , 493 – 496 .  

  64. Rayner , P. J. , Law , R. M. , Allison , C. E. , Francey , R. J. , Trudinger , C. M. and co-authors . 2008 . Interannual variability of the global car-bon cycle (1992-2005) inferred by inversion of atmospheric CO2 and 313CO2 measurements. Global Biogeochem. Cycles 22 , GB3008 , doi: https://doi.org/10.1029/2007GB003068 .  

  65. Rödenbeck , C. , Houweling , S. , Gloor , M. and Heimann , M . 2003 . CO2 flux history 1982-2001 inferred from atmospheric data using a global inversion of atmospheric transport. Atmos. Chem. Phy . 3 , 1919 - 1964 .  

  66. Scholze , M. , Kaplan , J. O. , Knorr , W. and Heimann , M. 2003. Climate and interannual variability of the atmosphere-biosphere 132 flux . Geophys. Res. Lett . 30 , 1097 – 1101 .  

  67. Scholze , M. , Ciais , P. and Heimann , M . 2008 . Modeling terrestrial C-13 cycling: climate, land use and fire. Global Biogeochem. Cycles 22 , GB1009 , doi: https://doi.org/10.1029/2006GB002899 .  

  68. Siegenthaler , U. and Oeschger , H . 1987 . Biospheric CO2 emissions during the past 200 years reconstructed by deconvolution of ice core data . Tellus 39B , 140 – 154 .  

  69. Still , C. J. , Berry , J. A. , Collatz , G. J. and DeFries , R. S . 2003 . Global distribution of C-3 and C-4 vegetation: carbon cycle implications . Global Biogeochem. Cycles 17 , 1006 – 1019 .  

  70. Suits , N. S. , Denning , A. S. , Berry , J. A. , Still , C. J. , Kaduk , J. and co-authors . 2005 . Simulation of carbon isotope discrimination of the terrestrial biosphere. Global Biogeochem. Cycles 19 , GB1017 , doi: https://doi.org/10.1029/2003GB002141 .  

  71. Suyker , A. E. , Verma , S. B. and Burba , G. G . 2003 . Interannual variabil-ity in net CO2 exchange of a native tallgrass prairie . Global Change Biol . 9 , 255 – 265 .  

  72. Sweeney , C. , Gloor , E. , Jacobson , A. R. , Key , R. M. , McKinley , G. and co-authors . 2007 . Constraining global air-sea gas exchange for CO2 with recent bomb C-14 measurements. Global Biogeochem. Cycles 21 , GB2015 , doi: https://doi.org/10.1029/2006GB002784 .  

  73. Takahashi , T. , Feely , R. A. , Weiss , R. E , Wanninkhof , R H. , Chipman , D. W. and co-authors . 1997 . Global air-sea flux of CO2: an estimate based on measurements of sea-air pC0(2) difference. Proc. Natl. Acad. Sci. USA 94 , 8292 - 8299 .  

  74. Takahashi , T. , Sutherland , S. C. , Wanninkhof , R. , Sweeney , C. , Feely , R. A. and co-authors . 2009 . Climatological mean and decadal change in surface ocean pCO2, and net sea-air CO2 flux over the global oceans. Deep-Sea Res. Part I-Oceanogr Res. Papers 56 , 2075 - 2076 .  

  75. Tans , P . P. 1980 . On calculating the transfer of C-13 in reservoir models of the carbon-cycle. Tellus 32 , 464 - 469 .  

  76. Tans , P. R. Berry , J. A. and Keeling , R. F. 1993. Oceanic C-13/C-12 observations—a new window on ocean CO2 uptake. Global Bio-geochem. Cycles 7 , 353 - 368 .  

  77. Thompson , M. V. and Randerson , J. T . 1999 . Impulse response functions of terrestrial carbon cycle models: method and application . Global Change Biol . 5 , 371 – 394 .  

  78. Thoning , K. W. , Tans , P. P. and Komhyr , W. D . 1989 . Atmo-spheric carbon-dioxide at Mauna Loa observatory, 2, analysis of the NOAA GMCC data, 1974-1985 . J. Geophys. Res.-Atmos . 94 , 8549 – 8565 .  

  79. Townsend , A. R. , Asner , G P. , White , J. W. C. and Tans , P. P. 2002. Land use effects on atmospheric C-13 imply a sizable terrestrial CO2 sink in tropical latitudes. Geophys. Res. Lett . 29 , 1426 - 1430 .  

  80. Trolier , M. , White , J. W. C. , Tans , P. P. , Masarie , K. A. and Gemery , P. A. 1996. Monitoring the isotopic composition of atmospheric CO2: measurements from the NOAA Global Air Sampling Network. J. Geophys. Res.-Atmos . 101 , 25897 - 25916 .  

  81. Van Der Werf , G. R. , Randerson , J. T. , Collatz , G. J. , Giglio , L. , Kasibhatla, P. S. and co-authors . 2004 . Continental-scale partitioning of fire emissions during the 1997 to 2001 El Niiio /La Nina period. Science 303 , 73 - 76 .  

  82. Van Der Werf , G. R. , Randerson , J. T. , Giglio , L. , Collatz , G. J. , Kasibhatla , P. S. and co-authors . 2006 . Interannual variability in global biomass burning emissions from 1997 to 2004. Atmos. Chem. Phys . 6 , 3423 - 3441 .  

  83. Vaughn , B. , Ferretti , D. , Miller , J. and White , J. W. C. 2004. Stable isotope measurements of atmospheric CO2 and CH4. In: Handbook of Stable Isotope Analytical Techniques (ed. P. A. D., Groot ). Elsevier, Amsterdam, London, 272 - 304 .  

  84. Vaughn , B H. , Evans , C. U. , White , J. W. C. , Still , C. J. , Masarie , K. A. and co-authors . 2009 . Global network measurements of atmospheric trace gas isotopes. In: Isoscapes, Understanding movement, pattern, and process on Earth through isotope mapping (eds J. B., West , G. J., Bowen , T. E., Dawson and K. P., Tu ). Springer, Amsterdam, 3 - 31 .  

  85. Wanninkhof, R. 1992. Relationship between wind-speed and gas-exchange over the ocean. J. Geophys. Res.-Oceans 97 , 7373 - 7382 .  

  86. Wetzel , R. , Winguth , A. , and Maier-Reimer , E. 2005 . Sea-to-air CO2 flux from 1948 to 2003: a model study . Global Biogeochem. Cycles 19 , GB2005 , doi: https://doi.org/10.1029/2004GB002339 .  

  87. Winguth , A. M. E. , Heimann , M. , Kurz , K D. , Maierreimer , E. , Milcolajewicz , U. and co-authors . 1994 . El-Niiio-Southern oscillation related fluctuations of the marine carbon-cycle. Global Biogeochem. Cycles 8 , 39 - 63 .  

  88. Zhang , J. , Quay , P. D. and Wilbur , D. O. 1995. Carbon-isotope fraction-ation during gas-water exchange and dissolution of CO2. Geochim. Cosmochim. Acta 59 , 107 - 114 .  

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