FN Archimer Export Format PT J TI Impact of climate change and variability on the global oceanic sink of CO2 BT AF LE QUERE, Corinne TAKAHASHI, Taro BUITENHUIS, Erik T. ROEDENBECK, Christian SUTHERLAND, Stewart C. AS 1:1,2;2:3;3:1;4:4;5:3; FF 1:;2:;3:;4:;5:; C1 Univ E Anglia, Sch Environm Sci, Norwich NR4 7TJ, Norfolk, England. British Antarctic Survey, Cambridge CB3 0ET, England. Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY 10964 USA. Max Planck Inst Biogeochem, D-07701 Jena, Germany. C2 UNIV E ANGLIA, UK BRITISH ANTARCTIC SURVEY, UK UNIV COLUMBIA, USA MAX PLANCK INST, GERMANY IF 5.263 TC 142 UR https://archimer.ifremer.fr/doc/00253/36412/34957.pdf LA English DT Article CR OISO 8 OISO1 OISO2 OISO3-NIVMER98 OISO4 (VT 46) OISO5 (VT 49) VT 51 / OISO 6 VT 57 / OISO 9 VT 60 / CARAUS - OISO 10 VT 62 / CARAUS - OISO 11 VT 79 / OISO 12 VT 80 / OISO 13 VT 81 / OISO 14 VT 85 / OISO 15 BO Marion Dufresne DE ;ocean;carbon;CO2 sink AB About one quarter of the CO2 emitted to the atmosphere by human activities is absorbed annually by the ocean. All the processes that influence the oceanic uptake of CO2 are controlled by climate. Hence changes in climate (both natural and human-induced) are expected to alter the uptake of CO2 by the ocean. However, available information that constrains the direction, magnitude, or rapidity of the response of ocean CO2 to changes in climate is limited. We present an analysis of oceanic CO2 trends for 1981 to 2007 from data and a model. Our analysis suggests that the global ocean responded to recent changes in climate by outgassing some preindustrial carbon, in part compensating the oceanic uptake of anthropogenic CO2. Using a model, we estimate that climate change and variability reduced the CO2 uptake by 12% compared to a simulation where constant climate is imposed, and offset 63% of the trend in response to increasing atmospheric CO2 alone. The response is caused by changes in wind patterns and ocean warming, with important nonlinear effects that amplify the response of oceanic CO2 to changes in climate by > 30%. PY 2010 PD OCT SO Global Biogeochemical Cycles SN 0886-6236 PU Amer Geophysical Union VL 24 IS 4/GB4007 UT 000283748000001 BP 1 EP 10 DI 10.1029/2009GB003599 ID 36412 ER EF