FN Archimer Export Format PT J TI Globally significant oceanic source of organic carbon aerosol BT AF SPRACKLEN, Dominick V. ARNOLD, Steve R. SCIARE, Jean CARSLAW, Kenneth S. PIO, Casimiro AS 1:1;2:1;3:3;4:1;5:2; FF 1:;2:;3:;4:;5:; C1 Univ Leeds, Sch Earth & Environm, Leeds LS2 9JT, W Yorkshire, England. Univ Aveiro, Ctr Environm & Marine Studies, P-3810193 Aveiro, Portugal. Lab Sci Climat & Environm, F-91191 Gif Sur Yvette, France. C2 UNIV LEEDS, UK UNIV AVEIRO, PORTUGAL LSCE, FRANCE IF 2.959 TC 106 UR https://archimer.ifremer.fr/doc/00237/34831/33290.pdf LA English DT Article CR VT 88 / OOMPH-1 - MD 160 / OOMPH BO Marion Dufresne AB Significant concentrations of organic carbon (OC) aerosol are observed at three oceanic surface sites (Amsterdam Island, Azores and Mace Head). Two global chemical transport models (CTMs) underpredict OC concentrations at these sites (normalised mean bias of -67% and -58%). During periods of high biological activity monthly mean concentrations are underpredicted by a factor of 5-20. At Amsterdam Island and Mace Head, observed OC correlates well (R-2 = 0.61-0.77) with back-trajectory weighted chlorophyll-a, suggesting an oceanic OC source driven by biological activity. We use a combination of remote sensed chlorophyll-a, back trajectories and observed OC to derive an empirical relation between chlorophyll-a and the total oceanic OC emission flux. Using the GEOS-chem CTM we show a global oceanic OC emission, from primary and secondary sources, of similar to 8 Tg/year matches observations. This emission is comparable in magnitude to the fossil fuel OC source and increases the simulated global OC burden by 20%. PY 2008 PD JUL SO Geophysical Research Letters SN 0094-8276 PU Amer Geophysical Union VL 35 IS 12 / L1281 UT 000257308800001 BP 1 EP 5 DI 10.1029/2008GL033359 ID 34831 ER EF