var archer_maier94 = "Archer, D. and Maier-Reimer, E. (1994) Effect of deep-sea sedimentary calcite preservation on atmospheric CO2 concentration. Nature 367(6460), 260–263.";
var archer_etal97 = "Archer, D., Kheshgi, H. and Maier-Reimer, E. (1997) Multiple timescales for neutralization of fossil fuel CO2. Geophysical Research Letters 24(4), 405–408.";
var armstrong_etal02 = "Armstrong, R.A., Lee, C., Hedges, J.I., Honjo, S. and Wakeham, S.G. (2002) A new, mechanistic model for organic carbon fluxes in the ocean based on the quantitative association of POC with ballast minerals. Deep-Sea Research Part II 49(1–3), 219–236.";
var bates01 = "Bates, N.R. (2001) Interannual variability of oceanic CO2 and biogeochemical properties in the Western North Atlantic subtropical gyre. Deep-Sea Research Part II 48(8–9), 1507–1528.";
var battle_etal00 = "Battle, M., Bender, M.L., Tans, P.P., White, J.W.C., Ellis, J.T., Conway, T. and Francey, R.J. (2000) Global carbon sinks and their variability inferred from atmospheric O2 and delta C-13. Science 287(5462), 2467–2470.";
var bopp_etal02 = "Bopp, L., Le Quéré, C., Heimann, M., Manning, A.C. and Monfray, P. (2002) Climate-induced oceanic oxygen fluxes: Implications for the contemporary carbon budget. Global Biogeochemical Cycles 16(2), doi:10.1029/2001GB001445.";
var bousquet_etal00 = "Bousquet, P., Peylin, P., Ciais, P., Le Quéré, C., Friedlingstein, P. and Tans, P.P. (2000) Regional changes in carbon dioxide fluxes of land and oceans since 1980. Science 290(5495), 1342–1346.";
var broecker_peng82 = "Broecker, W.S. and Peng, T.-H. (1982) Tracers in the Sea. Eldigio Press, Palisades, New York.";
var cox_etal00 = "Cox, P.M., Betts, R.A., Jones, C.D., Spall, S.A. and Totterdell, I.J. (2000) Acceleration of global warming due to carbon-cycle feedbacks in a coupled climate model. Nature 408, 184–187.";
var dore_etal03 = "Dore, J.E., Lukas, R., Sadler, D.W. and Karl, D.M. (2003) Climate-driven changes to the atmospheric CO2 sink in the subtropical North Pacific Ocean. Nature 424(6950), 754–757.";
var defresne_etal02 = "Dufresne, J.-L., Friedlingstein, P., Berthelot, M., Bopp, L., Ciais, P., Fairhead, L., LeTreut, H. and Monfray, P. (2002) Effects of climate change due to CO2 increase on land and ocean carbon uptake. Geophysical Research Letters 29(10); doi:10.1029/2001GL013777.";
var feely_etal97 = "Feely, R.A., Wanninkhof, R., Goyet, C., Archer, D.E. and Takahashi, T. (1997) Variability of CO2 distributions and sea–air fluxes in the central and eastern equatorial Pacific during the 1991–1994 El Niño. Deep-Sea Research Part II 44(9–10), 1851–1867.";
var feely_etal99 = "Feely, R.A., Wanninkhof, R., Takahashi, T. and Tans, P. (1999) Influence of El Niño on the equatorial Pacific contribution of atmospheric CO2 accumulation. Nature 398, 597–601.";
var feely_etal01 = "Feely, R.A., Sabine, C.L., Takahashi, T. and Wanninkhof, R. (2001) Uptake and storage of carbon dioxide in the oceans: The global CO2 survey. Oceanography 14(4), 18–32.";
var feely_etal04 = "Feely, R.A., Sabine, C.L., Lee, K., Berelson, W., Kleypas, J., Fabry, V.J. and Millero, F.J. (2004) Impact of anthropogenic CO2 on the CaCO3 system in the oceans. Science 305(5682), 362–366.";
var feely_etal05 = "Feely, R.A., Talley, L.D., Johnson, G.C., Sabine, C.L. and Wanninkhof, R. (2005) Repeat hydrography cruises reveal chemical changes in the North Atlantic. EOS, Transactions, American Geophysical Union 86(42), 399, 404–405.";
var francey_etal95 = "Francey, R.J., Tans, P.P., Allison, C.E., Enting, I.G., White, J.W. and Trolier, M. (1995) Changes in oceanic and terrestrial carbon uptake since 1982. Nature 373(6512), 326–330.";
var friedlingstein_etal03 = "Friedlingstein, P., Dufresne, J.L., Cox, P.M. and Rayner, P. (2003) How positive is the feedback between climate change and the carbon cycle? Tellus Series B 55(2), 692–700.";
var fung_etal05 = "Fung, I.Y., Doney, S.C., Lindsay, K. and John, J. (2005) Evolution of carbon sinks in a changing climate. Proceedings of the National Academy of Science 102(32), 11201–11206.";
var gloor_etal03 = "Gloor, M., Gruber, N., Sarmiento, J.L., Sabine, C.L., Feely, R.A. and Rödenbeck, C. (2003) A first estimate of present and preindustrial air–sea CO2 flux patterns based on ocean interior carbon measurements and models. Geophysical Research Letters 30(1), 1010; doi: 10.1029/2002GL015594.";
var greenblatt_sarmiento04 = "Greenblatt, J.B. and Sarmiento, J.L. (2004) Variability and climate feedback mechanisms in ocean uptake of CO2. In: Field, C.B. and Raupach, M.R. (eds) The Global Carbon Cycle: Integrating Humans, Climate, and the Natural World. Scope 62, Island Press, Washington, DC, pp. 257–275.";
var gruber_etal96 = "Gruber, N., Sarmiento, J.L. and Stocker, T.F. (1996) An improved method for detecting anthropogenic CO2 in the oceans. Global Biogeochemical Cycles 10, 809–837.";
var gruber_etal02 = "Gruber, N., Keeling, C.D. and Bates, N.R. (2002) Interannual variability in the North Atlantic Ocean carbon sink. Science 298(5602), 2374–2378.";
var gurney_etal02 = "Gurney, K.R., Law, R.M., Denning, A.S., Rayner, P.J., Baker, D., Bousquet, P., Bruhwiler, L., Chen, Y.H., Ciais, P., Fan, S., Fung, I.Y., Gloor, M., Heimann, M., Higuchi, K., John, J., Maki, T., Maksyutov, S., Masarie, K., Peylin, P., Prather, M., Pak, B.C., Randerson, J., Sarmiento, J., Taguchi, S., Takahashi, T. and Yuen, C.W. (2002) Towards robust regional estimates of CO2 sources and sinks using atmospheric transport models. Nature 415(6872), 626–630.";
var joos_prentice04 = "Joos, F. and Prentice, I.C. (2004) A paleo perspective on the future of atmospheric CO2 and climate. In: Field, C.B. and Raupach, M.R. (eds) The Global Carbon Cycle: Integrating Humans, Climate, and the Natural World. Scope 62, Island Press, Washington, DC, pp. 165–186.";
var joos_etal99 = "Joos, F., Plattner, G.K., Stocker, T.F., Marchal, O. and Schmittner, A. (1999) Global warming and marine carbon cycle feedbacks on future atmospheric CO2. Science 284(5413), 464–467.";
var keeling_etal96 = "Keeling, C.D., Chin, J.F.S. and Whorf, T.P. (1996) Increased activity of northern vegetation inferred from atmospheric CO2 measurements. Nature 382(6587), 146–149.";
var keeling_etal04 = "Keeling, C.D., Brix, H. and Gruber, N. (2004) Seasonal and long-term dynamics of the upper ocean carbon cycle at Station ALOHA near Hawaii. Global Biogeochemical Cycles 18(4), Art. No. GB4006.";
var key_etal04 = "Key, R.M., Kozyr, A., Sabine, C.L., Lee, K., Wanninkhof, R., Bullister, J.L., Feely, R.A., Millero, F.J., Mordy, C. and Peng, T.-H. (2004) A global ocean carbon climatology: Results from GLODAP. Global Biogeochemical Cycles 18, GB4031; doi:10.1029/2004GB002247.";
var klaas_archer02 = "Klaas, C. and Archer, D.E. (2002) Association of sinking organic matter with various types of mineral ballast in the deep sea: Implications for the rain ratio. Global Biogeochemical Cycles 16(4), Art. No. 1116.";
var lee01 = "Lee, K. (2001) Global net community production estimated from the annual cycle of surface water total dissolved inorganic carbon. Limnology and Oceanography 46(6), 1287–1297.";
var lee_etal98 = "Lee, K., Wanninkhof, R., Takahashi, T., Doney, S.C. and Feely, R.A. (1998) Low interannual variability in recent oceanic uptake of atmospheric carbon dioxide. Nature 396(6707), 155–159.";
var lequere_metzl04 = "Le Quéré, C. and Metzl, N. (2004) Natural processes regulating the oceanic uptake of CO2. In: Field, C.B. and Raupach, M.R. (eds) The Global Carbon Cycle: Integrating Humans, Climate, and the Natural World. Scope 62, Island Press, Washington, DC, pp. 243–255.";
var lequere_etal00 = "Le Quéré, C., Orr, J.C., Monfray, P., Aumont, O. and Madec, G. (2000) Interannual variability of the oceanic sink of CO2 from 1979 through 1997. Global Biogeochemical Cycles 14, 1247–1265.";
var lequere_etal03 = "Le Quéré, C., Aumont, O., Bopp, L., Bousquet, P., Ciais, P., Francey, R., Heimann, M., Keeling, C.D., Keeling, R.F., Kheshgi, H., Peylin, P., Piper, S.C., Prentice, I.C. and Rayner, P.J. (2003) Two decades of ocean CO2 sink and variability. Tellus 55B, 649–656.";
var matear_hirst99 = "Matear, R.J. and Hirst, A.C. (1999) Climate change feedback on the future oceanic CO2 uptake. Tellus 51B(3), 722–733."
var matsumoto_etal04 = "Matsumoto, K., Sarmiento, J.L., Key, R.M., Aumont, O., Bullister, J.L., Caldeira, K., Campin, J.M., Doney, S.C., Drange, H., Dutay, J.C., Follows, M., Gao, Y., Gnanadesikan, A., Gruber, N., Ishida, A., Joos, F., Lindsay, K., Maier-Reimer, E., Marshall, J.C., Matear, R.J., Monfray, P., Mouchet, A., Najjar, R., Plattner, G.K., Schlitzer, R., Slater, R., Swathi, P.S., Totterdell, I.J., Weirig, M.F., Yamanaka, Y., Yool, A. and Orr, J.C. (2004) Evaluation of ocean carbon cycle models with data-based metrics. Geophysical Research Letters 31(7), Art. No. L07303.";
var mckinley_etal04 = "McKinley, G.A., Rodenbeck, C., Gloor, M., Houweling, S. and Heimann, M. (2004) Mechanisms of air–sea CO2 flux variability in the equatorial Pacific and the North Atlantic. Global Biogeochemical Cycles 18(2), Art. No. GB2011.";
var mcneil_etal03 = "McNeil, B.I., Matear, R.J., Key, R.M., Bullister, J.L. and Sarmiento, J.L. (2003) Anthropogenic CO2 uptake by the ocean based on the global chlorofluorocarbon data set. Science 299(5604), 235–239. Available at: http://corona.pmel.noaa.gov/j_pdf/2003/mcne2489.pdf";
var milliman93 = "Milliman, J.D. (1993) Production and accumulation of calcium-carbonate in the ocean: Budget of a non-steady state. Global Biogeochemical Cycles 7(4), 927–957.";
var obata_kitamura03 = "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. Journal of Geophysical Research-Oceans 108(C11), Art. No. 3337.";
var orr04 = "Orr, J.C. (2004) Modelling of Ocean Storage of CO2: The GOSAC Study. Report PH4/37, IEA Greenhouse Gas R&D Programme.";
var park_etal06 = "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 two decades. Journal of Geophysical Research 111(C7), C07407, doi: 10.1029/2005JC003090.";
var peylin_etal05 = "Peylin, P., Bousquet, P., Le Quéré, C., Sitch, S., Friedlingstein, P., McKinley, G., Gruber, N., Rayner, P. and Ciais, P. (2005) Multiple constraints on regional CO2 flux variations over land and oceans. Global Biogeochemical Cycles 19, GB1011; doi:10.1029/2003GB002214.";
var plattner_etal01 = "Plattner, G.-K.G., Joos, F., Stocker, F. and Marchal, O. (2001) Feedback mechanisms and sensitivities of ocean carbon uptake under global warming. Tellus 538, 564–592.";
var rayner_etal99 = "Rayner, P.J., Enting, I.G., Francey, R.J. and Langenfelds, R. (1999) Reconstructing the recent carbon cycle from atmospheric CO2, delta C-13 and O2/N2 observations. Tellus 51B(2), 213–232.";
var revelle_suess57 = "Revelle, R. and Suess, H.E. (1957) Carbon dioxide exchange between the atmosphere and ocean and the question of an increase of atmospheric CO2 during the past decade. Tellus 9, 18–27.";
var ridgwell03 = "Ridgwell, A.J. (2003) An end to the ‘rain ratio’ reign? Geochemistry Geophysics Geosystems 4, Art. No. 1051.";
var sabine_etal04a = "Sabine, C.L., Heimann, M., Artaxo, P., Bakker, D., Chen, C.-T.A., Field, C.B., Gruber, N., Le Quéré, C., Prinn, R.G., Richey, J.E., Lankao, P.R., Sathaye, J. and Valentini, R. (2004a) Current status and past trends of the global carbon cycle. In: Field, C.B. and Raupach, M.R. (eds) The Global Carbon Cycle: Integrating Humans, Climate, and the Natural World. Scope 62, Island Press, Washington, DC, pp. 17–44.";
var sabine_etal04b = "Sabine, C.L., Feely, R.A., Gruber, N., Key, R.M., Lee, K., Bullister, J.L., Wanninkhof, R., Wong, C.L., Wallace, D.W.R., Tilbrook, B., Millero, F.J., Peng, T.-H., Kozyr, A., Ono, T. and Rios, A.F. (2004b) The oceanic sink for anthropogenic CO2. Science 305(5682), 367–371.";
var sarmiento_lequere96 = "Sarmiento, J.L. and Le Quéré, C. (1996) Oceanic carbon dioxide uptake in a model of century-scale global warming. Science 274(5291), 1346–1350.";
var sarmiento_etal98 = "Sarmiento, J.L., Hughes, T.M.C., Stouffer, R.J. and Manabe, S. (1998) Simulated response of the ocean carbon cycle to anthropogenic climate warming. Nature 393 (6682), 245–249.";
var signorini_etal01 = "Signorini, S.R., McClain, C.R., Christian, J.R. and Wong, C.S. (2001) Seasonal and interannual variability of phytoplankton, nutrients, TCO2, pCO2, and O2 in the eastern subarctic Pacific (ocean weather station Papa). Journal of Geophysical Research-Oceans 106(C12), 31197–31215.";
var skjelvan_etal99 = "Skjelvan, I., Johannessen, T. and Miller, L.A. (1999) Interannual variability of CO2 in the Greenland and Norwegian Seas. Tellus 51B(2), 477–489.";
var takahashi_etal93 = "Takahashi, T., Olafsson, J., Goddard, J.G., Chipman, D.W. and Sutherland, S.C. (1993) Seasonal variation of CO2 and nutrients in high-latitude surface oceans: A comparative study. Global Biogeochemical Cycles 7, 843–878.";
var takahashi_etal02 = "Takahashi, T., Sutherland, S.C., Sweeney, C., Poisson, A., Metzl, N., Tilbrook, B., Bates, N., Wanninkhof, R., Feely, R.A., Sabine, C. and Olafsson, J. (2002) Biological and temperature effects on seasonal changes of pCO2 in global ocean surface waters. Deep Sea Research 49(9–10), 1601–1622.";
var wallace01 = "Wallace, D.W.R. (2001) Storage and transport of excess CO2 in the oceans: The JGOFS/WOCE Global CO2 Survey, In: Siedler, G., Church, J. and Gould, J. (eds) Ocean Circulation and Climate: Observing and Modelling the Global Ocean. Academic Press, San Diego, California, pp. 489–521.";
var wanninkhof92 = "Wanninkhof, R. (1992) Relationship between gas exchange and wind speed over the ocean. Journal of Geophysical Research 97, 7373–7381.";
var wanninkhof_mcgillis99 = "Wanninkhof, R. and McGillis, W.R. (1999) A cubic relationship between air–sea CO2 exchange and wind speed. Geophysical Research Letters 26, 1889–1892.";
var wanninkhof_etal02 = "Wanninkhof, R.H., Doney, S.C., Takahashi, T. and McGillis, W.R. (2002) The effect of using time-averaged winds on regional air–sea CO2 fluxes. In: Donelan, M.A., Drennan, W.M., Saltzman, E.S. and Wanninkhof, R.H. (eds) Gas Transfer at Water Surfaces. Geophysical Monograph Series, Vol.127, American Geophysical Union, Washington, DC, pp. 351–356.";
var wanninkhof_etal05 = "Wanninkhof, R., Doney, S., Langdon, C., Bullister, J.L., Johnson, G.C., Warner, M. and Gruber, N. (2005) Decadal changes in inorganic carbon in the Atlantic Ocean. In: Seventh International Carbon Dioxide Conference, Extended Abstracts. Committee of the Seventh International Carbon Dioxide Conference, National Oceanic and Atmospheric Administration, Boulder, Colorado, pp. 417–418.";
var watson_orr03 = "Watson, A.J. and Orr, J.C. (2003) Carbon dioxide fluxes in the global ocean. In: Fasham, M., Field, J., Platt, T. and Zeitzschel, B. (eds) Ocean Biogeochemistry: The Role of the Ocean Carbon Cycle in Global Change (a JGOFS Synthesis). Springer, Berlin, pp. 123–141.";
var wetzel_etal05 = "Wetzel, P., Winguth, A. and Maier-Reimer, E. (2005) Sea-to-air CO2 flux from 1948 to 2003: A model study. Global Biogeochemical Cycles 19(2), Art. No. GB2005.";
var winguth_etal94 = "Winguth, A.M.E., Heimann, M., Kurz, K.D., Maier-Reimer, E., Mikolajewicz, U. and Segschneider, J. (1994) El Niño–southern oscillation related fluctuations of the marine carbon-cycle. Global Biogeochemical Cycles 8(1), 39–63.";
var wolf_etal99 = "Wolf-Gladrow, D.A., Riebesell, U., Burkhardt, S. and Bijma, J. (1999) Direct effects of CO2 concentration on growth and isotopic composition of marine plankton. Tellus 51B(2), 461–476.";
var zeebe_wolf01 = "Zeebe, R.E. and Wolf-Gladrow, D. (2001) CO2 in Seawater: Equilibrium, Kinetics, Isotopes. Elsevier Oceanographic Series 65, Elsevier, New York.";