Carbon isotopic fractionation during the CO2 exchange process between air and sea water under equilibrium and kinetic conditions |
| |
| Authors: | Hisayuki Inoue Yukio Sugimura |
| |
| Institution: | Geochemical Laboratory, Meteorological Research Institute, Nagamine 1-1, Yatabe, Tsukuba, Ibaraki 305, Japan |
| |
| Abstract: | Carbon isotopic fractionation during the air/sea exchange process is not fully understood at present. Information on the equilibrium and kinetic fractionation factors is an essential requirement, together with the value of the CO2 partial pressure, for understanding the carbon cycle in the atmosphere and marine environments. Using a specially designed countercurrent equilibrator system, the fractionation factors between gaseous CO2 and dissolved inorganic carbon in sea water were determined under both kinetic and equilibrium conditions. The following results were obtained: kinetic fractionation factor for air to sea (αas) is 0.998 at 288.2 K; kinetic fractionation factor for sea to air (αsa) is 0.990; equilibrium fractionation factor (αeq) is 0.991 at pH = 8.3 and 288.2 K. From these results, the carbon isotopic ratio of CO2 passed through the air/ sea interface is estimated to be about ?10 %. for air to sea and ?8 %. for sea to air when CO2 exchange takes place between air (δ13C = ?8 %.) and surface sea water (δ13C = 2 %.) at 288.2 K. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
