IPCC TAR 1.4 ± 0.7 1.7 ± 0.5 T3L1 1.3 ± 1.4 1.5 ± 1.4 T3L2 1.5 ± 1.0 1.3 ± 1.0 Bopp O2/N2 1.7 ± 0.9 ( 1.2 ± 0.9) 1.9 ± 0.9 ( 2.3 ± 0.7) Keeling O2/N2 1.7 ± 0.8 ( 1.3 ± 0.8) 1.4 ± 0.6 ( 1.9 ± 0.6) Joint 1.1 ± 0.2 2.1 ± 0.1 0.4 ± 0.2 1.7 ± 0.2 Gloor inverse 1.9 ± 0.3 ( 1.7 ± 0.3) 0.4 ± 0.3 1.5 ± 0.4 ( 1.8 ± 0.4) McNeil CFCs 1.5 ± 0.4 ( 2.0 ± 0.4) Matsumoto OCMIP 1.7 ± 0.2 ( 2.2 ± 0.2) Tak99 k u 2.1 Tak02 k u 1.6 Tak02 k u 2.3 MOM3 forward 2.2 ± 0.2 0.4 ± 0.1 1.7 ± 0.2 Estimates have been corrected so that river carbon flow is manifested as a land sink and a preindustrial ocean source of 0.45 PgC yr 1 (see auxiliary material). Contemporary air-sea fluxes (Fcontemp = Fpreindust + Fanthro) have been scaled to the 1992–1996 period by assuming the anthropogenic component is proportional to the atmospheric concentration perturbation, but air-land fluxes are not scaled. Original estimates, uncorrected for river carbon and unscaled in time, are given in parentheses. ‘‘IPCC-TAR 90s’’ is the estimate of Prentice et al. [2001] for the 1990s; ‘‘T3L1’’ and ‘‘T3L2’’ are the TransCom3 control inversions for level 1 [Gurney et al., 2002] and level 2 [Gurney et al., 2004], respectively, both for the period 1992–1996. ‘‘BoppO2/N2’’ and ‘‘Keeling O2/N2’’ represent the oxygen analyses of Bopp et al. [2002] for the period 1990–1996 and Keeling and Garcia [2002] for the 1990s, respectively. ‘‘Joint’’ is the current joint inversion for the period 1992–1996. ‘‘Gloor inverse’’ is the previous ocean inversion of Gloor et al. [2003] scaled to 1992–1996, a result nearly identical to that of McNeil et al. [2003] from CFC analysis. ‘‘Matsumoto OCMIP’’ is the summary of forward ocean carbon cycle simulations [Orr et al., 2001], as reported by Matsumoto et al. [2004], also scaled to 1992–1996. ‘‘Tak99’’ and ‘‘Tak02’’ represent estimates based on the DpCO2 analyses of Takahashi et al. [1999, 2002] respectively, using quadratic (‘‘k u’’ [Wanninkhof, 1992]) and cubic (‘‘k u’’ [Wanninkhof and McGillis, 1999]) gas transfer velocity parameterizations. ‘‘MOM3 Forward’’ are the 1992–1996 fluxes from OCMIP2 biotic simulations for the five models of the MOM3 suite used in the present study (see Table 1 of Jacobson et al. [2007]). For the period of the 1990s. Air-sea fluxes scaled to 1992–1996 by assuming that the anthropogenic flux is proportional to the atmospheric CO2 perturbation. For the period 1990–1996. Includes 0.45 ± 0.18 PgC yr 1 to account for river carbon fluxes (see auxiliary material). For the period 1990–1991. GLOBAL BIOGEOCHEMICAL CYCLES, VOL. 21, GB2025, doi:10.1029/2007GB003012, 2007 Click Here for Full Article