Lamont-Doherty Earth Observatory of Columbia University
Printed on 07/15/02    940,000 Data Points

Net Sea-Air CO2 Flux  - 1995

NCAR/NCEP 41-Year Reanalysis Wind Data (0.995 Sigma Level)

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     -0.40                         -0.39
14°N-50°N  (95)  -0.64     -0.34      0.07               -0.92
14°S-14°N  (95)   0.74      0.15      0.18                1.07
14°S-50°S  (95)  -0.51     -0.33     -0.67               -1.51
S. of 50°S (95)                                -0.47     -0.47
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Total      (95)  -0.40     -0.92     -0.43     -0.47     -2.22
% of Uptake         18        41        19        21       100
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Area (10^6 km^2) 152.0      74.4      53.2      41.1     320.7
% of Area           47        23        17        13     100.0
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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)   0.03     -0.55                         -0.52
14°N-50°N  (95)  -0.94     -0.48      0.10               -1.31
14°S-14°N  (95)   0.67      0.14      0.20                1.00
14°S-50°S  (95)  -0.68     -0.51     -0.97               -2.16
S. of 50°S (95)                                -0.74     -0.74
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Total      (95)  -0.92     -1.39     -0.67     -0.74     -3.72
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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

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