THREE YEARS OF CO2 DETERMINATION IN THE EAST ATLANTIC OCEAN M. González-Dávila, J.M. Santana-Casiano and I.R. Ucha Fac. Ciencias del Mar. Universidad de Las Palmas G.C. SPAIN
Feb 2007 Jul 2007 Special thanks go to the Mediterranean Shipping Company MSC-MARTINA, 2005 MSC-GINA, 2006 MSC-BENEDETTA, 2007-July 2008
25 20 15 10 5 N 0 S 5 10 15 CC NEC ITCZ Aug GD ITCZ Feb NECC GC nSEC EUC SECC EUp eSEC SEUC cSEC AG AC SECC ABF After Stramma and Schott, 1999 Jul 2007
Oct 2007 Feb 2007 SEC SECC SEC SECC NECC ITCZ ef. Cape Verde Up. Cape Blanc Up.
fCO2 (matm) fCO2 (matm)
IF fCO2(max) corresponds with T(max) (WARMER SEASON) THEN DfCO2 is positive Following Takahashi et al., 2002 DfCO2 negative: strong biological drawdown, increase of fCO2 due to vertical mixing with low temperature seawater DfCO2 positive: warm periods fCO2 values greater than the cold ones. Seasonal temperature changes account for more than 50% of the seasonal fCO2 changes
To remove temperature effect from the observed fCO2, values were normalized to the mean annual T To remove temperature changes on fCO2, mean annual fCO2 values were perturbated
Relative importance of the biology and temperature effects T/B > 1 or (T-B) > 0 Temperature effects exceeds the biology effect