FN Archimer Export Format PT J TI Seasonal Carbon Dynamics in the Near‐Global Ocean BT AF Keppler, L. Landschützer, P. Gruber, N. Lauvset, S. K. Stemmler, I. AS 1:1,2;2:2;3:3;4:4;5:1; FF 1:;2:;3:;4:;5:; C1 Max‐Planck‐Institute for Meteorology Hamburg ,Germany International Max Planck Research School on Earth System Modelling Hamburg ,Germany Environmental Physics, Institute of Biogeochemistry and Pollutant Dynamics ETH Zurich Zurich , Switzerland NORCE Norwegian Research Centre, Bjerknes Centre for Climate Research Bergen , Norway C2 MPI-M, GERMANY IMPRS-ESM, GERMANY ETH ZURICH, SWITZERLAND NORCE, NORWAY IF 5.703 TC 26 UR https://archimer.ifremer.fr/doc/00668/78016/80262.pdf https://archimer.ifremer.fr/doc/00668/78016/80263.pdf LA English DT Article CR OISO - OCÉAN INDIEN SERVICE D'OBSERVATION DE ;DIC;seasonal variability;neural networks;SOM‐FFN;monthly climatology;NCP AB The seasonal cycle represents one of the largest signals of dissolved inorganic carbon (DIC) in the ocean, yet these seasonal variations are not well established at a global scale. Here, we present the Mapped Observation‐Based Oceanic DIC (MOBO‐DIC) product, a monthly DIC climatology developed based on the DIC measurements from GLODAPv2.2019 and a two‐step neural network method to interpolate and map the measurements. MOBO‐DIC extends from the surface down to 2,000 m and from 65°N to 65°S. We find the largest seasonal amplitudes of surface DIC in the northern high‐latitude Pacific (∼30 to >50 μmol kg−1). Surface DIC maxima occur in hemispheric spring and minima in fall, driven by the input of DIC into the upper ocean by mixing during winter, and net community production (NCP) driven drawdown of DIC over summer. The seasonal pattern seen at the surface extends to a nodal depth of <50 m in the tropics and several hundred meters in the subtropics. Below the nodal depth, the seasonal cycle of DIC has the opposite phase, primarily owing to the seasonal accumulation of DIC stemming from the remineralization of sinking organic matter. The well‐captured seasonal drawdown of DIC in the mid‐latitudes (23° to 65°) allows us to estimate the spring‐to‐fall NCP in this region. We find a spatially relatively uniform spring‐to‐fall NCP of 1.9 ± 1.3 mol C m−2 yr−1, which sums to 3.9 ± 2.7 Pg C yr−1 over this region. This corresponds to a global spring‐to‐fall NCP of 8.2 ± 5.6 Pg C yr−1. PY 2020 PD DEC SO Global Biogeochemical Cycles SN 0886-6236 PU American Geophysical Union (AGU) VL 34 IS 12 UT 000603665500007 DI 10.1029/2020GB006571 ID 78016 ER EF