FN Archimer Export Format PT J TI Reconciling Observation and Model Trends in North Atlantic Surface CO2 BT AF LEBEHOT, Alice D. HALLORAN, Paul Richard WATSON, Andrew J. MCNEALL, Doug FORD, David A. LANDSCHUETZER, Peter LAUVSET, Siv K. SCHUSTER, Ute AS 1:1,2,3;2:1;3:1;4:4;5:4;6:5;7:6,7;8:1; FF 1:;2:;3:;4:;5:;6:;7:;8:; C1 Univ Exeter, Coll Life & Environm Studies, Geog, Laver Bldg, Exeter, Devon, England. Univ Cape Town, Marine Res Inst, Dept Oceanog, Cape Town, South Africa. CSIR, SOCCO, Cape Town, South Africa. Met Off, Exeter, Devon, England. Max Planck Inst Meteorol, Hamburg, Germany. Bjerknes Ctr Climate Res, NORCE Norwegian Res Ctr, Bergen, Norway. Univ Bergen, Bjerknes Ctr Climate Res, Geophys Inst, Bergen, Norway. C2 UNIV EXETER, UK UNIV CAPE TOWN, SOUTH AFRICA CSIR, SOUTH AFRICA MET OFF, UK MAX PLANCK INST METEOROL, GERMANY BCCR, NORWAY UNIV BERGEN, NORWAY IF 4.608 TC 11 UR https://archimer.ifremer.fr/doc/00675/78721/81005.pdf https://archimer.ifremer.fr/doc/00675/78721/81006.pdf LA English DT Article CR OISO - OCÉAN INDIEN SERVICE D'OBSERVATION AB The North Atlantic Ocean is a region of intense uptake of atmospheric CO2. To assess how this CO2 sink has evolved over recent decades, various approaches have been used to estimate basin-wide uptake from the irregularly sampled in situ CO2 observations. Until now, the lack of robust uncertainties associated with observation-based gap-filling methods required to produce these estimates has limited the capacity to validate climate model simulated surface ocean CO2 concentrations. After robustly quantifying basin-wide and annually varying interpolation uncertainties using both observational and model data, we show that the North Atlantic surface ocean fugacity of CO2 (fCO(2-ocean)) increased at a significantly slower rate than that simulated by the latest generation of Earth System Models during the period 1992-2014. We further show, with initialized model simulations, that the inability of these models to capture the observed trend in surface fCO(2-ocean) is primarily due to biases in the models' ocean biogeochemistry. Our results imply that current projections may underestimate the contribution of the North Atlantic to mitigating increasing future atmospheric CO2 concentrations. PY 2019 PD OCT SO Global Biogeochemical Cycles SN 0886-6236 PU Amer Geophysical Union VL 33 IS 10 UT 000492490200001 BP 1204 EP 1222 DI 10.1029/2019GB006186 ID 78721 ER EF