Lamont-Doherty Earth Observatory of Columbia University Printed on 10/15/03 940K Data Points Net Sea-Air CO2 Flux - 1995 NCAR/NCEP 41-Year Reanalysis Wind Data (10 Meter Height) Wanninkhof (1992) Gas Transfer Coeff. (k) k (cm/hr) = 0.39 * (wind speed @ 10m [m/sec]^2) * Sqrt(Sc/660)^-1 Flux = k * (CO2 Solubility in seawater) * (Sea-Air pCO2 Diff.) Sea - Air Flux in Pg (10^15 g) Carbon / year Lat. Band Pacific Atlantic Indian Southern Global N. of 50°N (95) 0.01 -0.31 -0.30 14°N-50°N (95) -0.50 -0.27 0.05 -0.72 14°S-14°N (95) 0.62 0.12 0.14 0.89 14°S-50°S (95) -0.40 -0.24 -0.52 -1.16 S. of 50°S (95) -0.35 -0.35 -------------------------------------------------------------- Total (95) -0.27 -0.69 -0.33 -0.35 -1.64 % of Uptake 16 42 20 21 100 -------------------------------------------------------------- Area (10^6 km^2) 152.0 74.4 53.2 41.1 320.7 % of Area 47 23 17 13 100.0 -------------------------------------------------------------- NCAR/NCEP 41-Year Reanalysis Wind Data Wanninkhof & McGillis(1999) Gas Transfer Coeff. (k) U = wind speed @ 10 m (m/sec) k (cm/hr) = (1.09 * U - 0.333 * U^2 + 0.078 * U^3) * Sqrt(Sc/660)^-1 Flux = k * (CO2 Solubility in seawater) * (Sea-Air pCO2 Diff.) Sea - Air Flux in Pg (10^15 g) Carbon / year Lat. Band Pacific Atlantic Indian Southern Global N. of 50°N (95) 0.02 -0.36 -0.34 14°N-50°N (95) -0.62 -0.32 0.06 -0.89 14°S-14°N (95) 0.51 0.10 0.13 0.75 14°S-50°S (95) -0.46 -0.31 -0.64 -1.41 S. of 50°S (95) -0.45 -0.45 -------------------------------------------------------------- Total (95) -0.54 -0.89 -0.45 -0.45 -2.34 -------------------------------------------------------------- Area in units of 10^6 km^2 Lat. Band Pacific Atlantic Indian Southern Global N. of 50°N (95) 4.93 9.23 14.16 14°N-50°N (95) 42.59 24.41 2.12 69.12 14°S-14°N (95) 50.93 15.91 19.83 86.67 14°S-50°S (95) 53.58 24.82 31.22 109.62 S. of 50°S (95) 41.10 41.10 --------------------------------------------------------------