[en] The exchange of CO2 between the atmosphere and the global coastal ocean was evaluated from a compilation of air-water CO2 fluxes scaled using a spatially-explicit global typology of inner estuaries (excluding outer estuaries such as large river deltas) and continental shelves. The computed emission of CO2 to the atmosphere from estuaries (+0.27 +/- 0.23 PgC yr(-1)) is similar to 26% to similar to 55% lower than previous estimates while the sink of atmospheric CO2 over continental shelf seas (-0.21 +/- 0.36 PgC yr(-1)) is at the low end of the range of previous estimates (-0.22 to -1.00 PgC yr(-1)). The air-sea CO2 flux per surface area over continental shelf seas (-0.7 +/- 1.2 molC m(-2) yr(-1)) is the double of the value in the open ocean based on the most recent CO2 climatology. The largest uncertainty of scaling approaches remains in the availability of CO2 data to describe the spatial variability, and to capture relevant temporal scales of variability. Citation: Laruelle, G. G., H. H. Durr, C. P. Slomp, and A. V. Borges (2010), Evaluation of sinks and sources of CO2 in the global coastal ocean using a spatially-explicit typology of estuaries and continental shelves, Geophys. Res. Lett., 37, L15607, doi:10.1029/2010GL043691.
Abril, G., and A. V. Borges (2004), Carbon dioxide and methane emissions from estuaries, in Greenhouse Gases Emissions From Natural Environments and Hydroelectric Reservoirs: Fluxes and Processes, edited by A. Tremblay et al., pp. 187-207, Springer, Berlin.
Bianchi, T. S., and M. A. Allison (2009), Large-river delta-front estuaries as natural "recorders" of global environmental change, Proc. Natl. Acad. Sci. U. S. A., 106(20), 8085-8092.
Borges, A. V. (2005), Do we have enough pieces of the jigsaw to integrate CO2 fluxes in the coastal ocean?, Estuaries, 28(1), 3-27, doi:10.1007/ BF02732750.
Borges, A. V. (2010), Present day carbon dioxide fluxes in the coastal ocean and possible feedbacks under global change, in Oceans and the Atmospheric Carbon Content, edited by P. M. da Silva Duarte and J. M. Santana Casiano, in press.
Borges, A. V., and M. Frankignoulle (2002), Distribution and air-water exchange of carbon dioxide in the Scheldt plume off the Belgian coast, Biogeochemistry, 59(1-2), 41-67, doi:10.1023/A:1015517428985. (Pubitemid 34788747)
Borges, A. V., S. Djenidi, G. Lacroix, J. Théate, B. Delille, and M. Frankignoulle (2003), Atmospheric CO2 flux from mangrove surrounding waters, Geophys. Res. Lett, 30(11), 1558, doi:10.1029/2003GL017143.
Borges, A. V., B. Delille, and M. Frankignoulle (2005), Budgeting sinks and sources of CO2 in the coastal ocean: Diversity of ecosystems counts, Geophys. Res. Lett, 32, L14601, doi:10.1029/2005GL023053. (Pubitemid 41372590)
Borges, A. V., K. Ruddick, L.-S. Schiettecatte, and B. Delille (2008a), Net ecosystem production and carbon dioxide fluxes in the Scheldt estuarine plume, BMC Ecol, 8, 15, doi:10.1186/1472-6785-8-15.
Borges, A. V., B. Tilbrook, N. Metzl, A. Lenton, and B. Delille (2008b), Inter-annual variability of the carbon dioxide oceanic sink south of Tasmania, Biogeosciences, 5, 141-155, doi:10.5194/bg-5-141-2008.
Cai, W.-J., M. H. Dai, and Y. C. Wang (2006), Air-sea exchange of carbon dioxide in ocean margins: A province-based synthesis, Geophys. Res. Lett, 33, L12603, doi:10.1029/2006GL026219. (Pubitemid 44687712)
Chen, C. T. A., and A. V. Borges (2009), Reconciling opposing views on carbon cycling in the coastal ocean: continental shelves as sinks and near-shore ecosystems as sources of atmospheric CO2, Deep Sea Res., Part II, 56(8-10), 578-590, doi:10.1016/j.dsr2.2009.01.001.
Dai, M., Z. Lu, W. Zhai, B. Chen, Z. Cao, K. Zhou, W.-J. Cai, and C.-T. A. Chen (2009), Diurnal variations of surface seawater pCO2 in contrasting coastal environments, Limnol. Oceanogr., 54(3), 735-745.
de la Paz, M., X. A. Padín, A. F. Ríos, and F. F. Pérez (2010), Surface fCO2 variability in the Loire plume and adjacent shelf waters: High spatio-temporal resolution study using ships of opportunity, Mar. Chem., 118, 108-118, doi:10.1016/j.marchem.2009.11.004.
Dürr, H. H., G. G. Laruelle, C. M. van Kempen, C. P. Slomp, M. Meybeck and H. Middelkoop (2010), World-wide typology of near-shore coastal systems: Defining the estuarine filter of riverine inputs to the oceans, Estuaries Coasts, in press.
Frankignoulle, M., G. Abril, A. Borges, I. Bourge, C. Canon, B. Delille, E. Libert, and J.-M. Théate (1998), Carbon dioxide emission from European estuaries, Science, 282, 434-436, doi:10.1126/science.282.5388.434. (Pubitemid 28483661)
Friederich, G. E., P. M. Walz, M. G. Burczynski, and F. P. Chavez (2002), Inorganic carbon in the central California upwelling system during the 1997-1999 El Niño-La Niña event, Prog. Oceanogr., 54(1-4), 185-203, doi:10.1016/S0079-6611(02)00049-6.
Friederich, G. E., J. Ledesma, O. Ulloa, and F. P. Chavez (2008), Air-sea carbon dioxide fluxes in the coastal southeastern tropical Pacific, Prog. Oceanogr, 79(2-4), 156-166, doi:10.1016/j.pocean.2008.10.001.
Gruber, N., et al. (2009), Oceanic sources, sinks, and transport of atmospheric CO2, Global Biogeochem. Cycles, 23, GB1005, doi:10.1029/ 2008GB003349.
Koné, Y. J. M., G. Abril, K. N. Kouadio, B. Delille, and A. V. Borges (2009), Seasonal variability of carbon dioxide in the rivers and lagoons of Ivory Coast (West Africa), Estuaries Coasts, 32, 246-260, doi:10.1007/s12237-008-9121-0.
Körtzinger, A. (2003), A significant CO2 sink in the tropical Atlantic Ocean associated with the Amazon river plume, Geophys. Res. Lett, 30(24), 2287, doi:10.1029/2003GL018841.
Meybeck, M., H. H. Dürr, and C. J. Vörosmarty (2006), Global coastal segmentation and its river catchment contributors: A new look at land-ocean linkage, Global Biogeochem. Cycles, 20, GB1S90, doi:10.1029/ 2005GB002540.
Salisbury, J., D. Vandemark, C. Hunt, J. Campbell, B. Jonsson, A. Mahadevan, W. McGillis, and H. Xue (2009), Episodic riverine influence on surface DIC in the coastal Gulf of Maine, Estuarine Coastal Shelf Sci., 82, 108-118, doi: 10.1016/j.ecss.2008.12.021.
Smith, W. H. F., and D. T. Sandwell (1997), Global sea floor topography from satellite altimetry and ship depth soundings, Science, 277(5334), 1956-1962, doi:10.1126/science.277.5334.1956. (Pubitemid 27449130)
Takahashi, T., et al. (2009), Climatological mean and decadal change in surface ocean pCO2, and net sea-air CO2 flux over the global oceans, Deep Sea Res., Part II, 56(8-10), 554-577, doi:10.1016/j. dsr2.2008.12.009.
Thomas, H., Y. Bozec, K. Elkalay, and H. J. W. de Baar (2004), Enhanced open ocean storage of CO2 from shelf sea pumping, Science, 304(5673), 1005-1008, doi:10.1126/science.1095491. (Pubitemid 38638097)
Tsunogai, S., S. Watanabe, and T. Sato (1999), Is there a "continental shelf pump" for the absorption of atmospheric CO 2?, Tellus, Ser. B, 51, 701-712, doi:10.1034/j.1600-0889.1999.t01-2- 00010.x.
Walsh, J. J. (1988), On the Nature of Continental Shelves, Academic, San Diego, Calif.
Wollast, R. (1998), Evaluation and comparison of the global carbon cycle in the coastal zone and in the open ocean, in The Sea, vol.10, The Global Coastal Ocean: Ideas and Observations on Progress in the Study of the Seas, edited by K. H. Brink and A. R. Robinson, pp. 213-252, John Wiley
Hoboken, N. J. Woodwell, G. M., P. H. Rich, and C. A. S. Hall (1973), Carbon in estuaries, in Carbon and the Biosphere, edited by G. M. Woodwell and E. V. Pecan, Brookhaven Symp. Biol., 24, 221-240.
Zhai, W., and M. Dai (2009), On the seasonal variation of air-sea CO 2 fluxes in the outer Changjiang (Yangtze River) Estuary, East China Sea, Mar. Chem., 117(1-4), 2-10, doi:10.1016/j.marchem.2009.02.008.