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The air-sea exchanges of CO 2 in the world's 165 estuaries and 87 continental shelves are evaluated. Generally and in all seasons, upper estuaries with salinities of less than two are strong sources of CO 2 (39 ± 56 mol C m −2 yr −1 , negative flux indicates that the water is losing CO 2 to the atmosphere); mid-estuaries with salinities of be-5 BGDdoi:10.5194/bgd-10-5041-2013 fatcat:h7oby5u6fngrrng4o6fqlffo2i