var archer_etal96 = "Archer, D. E. et al. Seasonal and interannual variability of sea-surface carbon and nutrient concentration in the equatorial Pacific Ocean. Deep-Sea Res. II 43(4–6), 779–808 (1996).";
var ciais_etal95a = "Ciais, P. et al. Partitioning of ocean and land uptake of CO2 as inferred by CO2 measurements from the NOAA/CMDL global air sampling network. J. Geophys. Res. 100, 5051–5070 (1995).";
var ciais_etal95b = "Ciais, P., Tans, P.P., Trolier, M., White, J.W. and Francey, R.J. A large northern hemisphere terrestrial CO2 sink indicated by the 13C/12C ratio of atmospheric CO2. Science 269, 1098–1102 (1995).";
var feely_etal87 = "Feely, R.A. et al. Distribution of chemical tracers in the eastern equatorial Pacific during and after the 1982–1983 El Niño/Southern Oscillation event. J. Geophys. Res. 92, 6545–6558 (1987).";
var feely_etal95 = "Feely, R.A. et al. CO2 distributions in the equatorial Pacific during the 1991–92 ENSO event. Deep-Sea Res. II 42(2–3), 365–386 (1995).";
var feely_etal97 = "Feely, R.A., Wanninkhof, R., Goyet, C., Archer, D.E. and Takahashi, T. Variability of CO2 distributions and sea-air fluxes in the central and eastern equatorial Pacific during the 1991–94 El Niño. Deep-Sea Res. II 44, 1851–1867 (1997).";
var francey_etal95 = "Francey, R.J. et al. Changes in oceanic and terrestrial carbon uptake since 1982. Nature 373, 326–330 (1995).";
var goyet_peltzer94 = "Goyet, C. and Peltzer, E.T. Comparison of the August–September 1991 and 1979 surface partial pressure of CO2 distribution in the Equatorial Pacific Ocean near 150°W. Mar. Chem. 45, 257–266 (1994).";
var gu_philander97 = "Gu, D. and Philander, S.G.H. Interdecadal climate fluctuations that depend on exchanges between the tropics and extratropics. Science 275, 805–807 (1997).";
var harrison96 = "Harrison, D.E. Vertical velocity in the central tropical Pacific—a circulation model perspective for JGOFS. Deep-Sea Res. II 43(4–6), 687–705 (1996).";
var houghton_etal94 = "Houghton, J. et al. (eds) Climate Change 1994: Radiative Forcing of Climate Change and an Evaluation of the IPCC 1992 Emission Scenarios (Cambridge Univ. Press, 1994).";
var inoue_etal96 = "Inoue, H.Y., Ishii, M., Matsueda, H. and Ahoyama, M. Changes in longitudinal distributions of partial pressure of CO2 (pCO2) in the central and western equatorial Pacific, west of 160°W. Geophys. Res. Lett. 23(14), 1781–1784 (1996).";
var inoue_sugimura92 = "Inoue, H. and Sugimura, Y. Variations and distributions of CO2 in and over the equatorial Pacific during the period from 1986/88 El Niño event to the 1988/89 La Niña event. Tellus B 44, 1–22 (1992).";
var inoue_etal95 = "Inoue, H.Y. et al. Long-term trend of the partial pressure of carbon dioxide (pCO2) in surface waters of the western North Pacific, 1984–1993. Tellus B 47, 391–413 (1995).";
var keeling_etal65 = "Keeling, C.D., Rakestraw, N.W. and Waterman, L.S. Carbon dioxide in the surface waters of the Pacific Ocean, 1—Measurements of the distribution. J. Geophys. Res. 70, 6087–6097 (1965).";
var keeling_etal95 = "Keeling, C.D., Whorf, T.P., Wahlen, M. and Vander Plicht, J. Interannual extremes in the rate of rise of atmospheric carbon dioxide since 1980. Nature 375, 666–670 (1995).";
var maier_hasselmann87 = "Maier-Reimer, E. and Hasselmann, K. Transport and storage of CO2 in the ocean—An inorganic ocean-circulation carbon cycle model. Clim. Dyn. 2, 63–90 (1987).";
var mcphaden93 = "McPhaden, M.J. TOGA-TAO and the 1991–92 ENSO event. Oceanography 6(2), 36–44 (1993).";
var murphy_etal94 = "Murphy, P.P., Kelly, K.C., Feely, R.A. and Gammon, R.H. Carbon Dioxide Concentrations in Surface Water and the Atmosphere: PMEL Cruises 1986–1989 (Tech. Memo. ERL PMEL-101 (DE95-009659), NOAA, Seattle, 1994). ";
var murray_etal94 = "Murray, J.W., Barber, R.T., Roman, M., Bacon, M. and Feely, R.A. Physical and biological controls on carbon cycling in the equatorial Pacific. Science 266, 58–65 (1994).";
var quay_stuiver83 = "Quay, P.D. and Stuiver, M. Broecker upwelling rates for the equatorial Pacific Ocean derived from bomb 14C distribution. J. Mar. Res. 41, 769–792 (1983).";
var takahashi_etal97 = "Takahashi, T. et al. Global air-sea flux of CO2: An estimate based on measurements of sea-air pCO2 difference. Proc. Natl. Acad. Sci. USA 94, 8292–8299 (1997).";
var tans_etal90 = "Tans, P.P., Fung, I.Y., and Takahashi, T. Observational constraints on the global atmospheric CO2 budget. Science 247, 1431–1438 (1990).";
var toggweiler_carlson95 = "Toggweiler, J.R. and Carson, S. in Upwelling the Ocean: Modern Processes and Ancient Records (eds Summerhayes, C. et al.) 337–360 (Wiley, Chichester, 1995).";
var toggweiler_etal91 = "Toggweiler, J.R., Dixon, K. and Broecker, W.S. The Peru upwelling and the ventilation of the South Pacific thermocline. J. Geophys. Res. 96, 20467–20497 (1991). ";
var tsuchiya_etal90 = "Tsuchiya, M., Lukas, R., Fine, R.A., Firing, E. and Lindstrom, E. Source waters of the Pacific Equatorial Undercurrent. Prog. Oceanogr. 23, 101–147 (1990).";
var wanninkhof92 = "Wanninkhof, R. Relationship between wind speed and gas exchange over the ocean. J. Geophys. Res. 97, 7373–7382 (1992).";
var wanninkhof_etal96 = "Wanninkhof, R., Feely, R.A., Chen, H., Cosca, C. and Murphy, P.P. Surface water fCO2 values in the eastern equatorial Pacific during the 1992–93 El Niño. J. Geophys. Res. 101, 16333–16343 (1996).";
var wanninkhof_thoning93 = "Wanninkhof, R. and Thoning, K. Measurement of CO2 in surface water using continuous and discrete sampling methods. Mar. Chem. 44, 189–205 (1993).";
var winn_etal98 = "Winn, C.D., Li, Y.-H., Mackenzie, F.T. and Karl, D.M. Rising surface dissolved inorganic carbon at the Hawaii Ocean Time-series site. Mar. Chem. 60(1–2), 33–48 (1998). ";