There are 12 monthly maps showing the
distribution of sea-air pCO2 differences over the global oceans. They
were obtained using each of two schemes to correct observations to a
reference year of 1990, named, respectively, (
dp90) full correction, and (
hf90)
half correction. The first assumes that pCO2 in high latitude surface
waters changed seasonally, but not from year to year, due to convective
mixing with deep waters. The second assumes that pCO2 in high latitude
waters increased yearly at a rate half of that observed for atmospheric
CO2. In addition, one file shows a map of the net CO2 flux over the
oceans for the reference year of 1990. This has been computed using
"full correction" sea-air pCO2 difference for each month, the monthly
climatological wind speed assembled by Esbensen and Kushnir, and the
effect of wind speeds on the CO2 gas transfer coefficient formulated by
Wanninkhof.
flux contain the annual flux of carbon for 1990. in units of 10^12 grams Carbon/year.
Reference
Takahashi, et al., "Global air-sea flux of CO2: An
estimate based on measurements of sea-air pCO2 difference,"
Volume 94,
Proceedings of the National Academy of Sciences, USA, pages
8929-8299, August 1997.
Please address inquiries to
Taro Takahashi, taka@ldeo.columbia.edu
OR Stewart C. Sutherland, suth@ldeo.columbia.edu
Lamont-Doherty Earth Observatory
of Columbia University