Tuning a physically-based model of the air–sea gas transfer velocity |
| |
| Authors: | CD Jeffery IS Robinson DK Woolf |
| |
| Institution: | 1. Rosenstiel School of Marine and Atmospheric Science, University of Miami, 4600 Rickenbacker Causeway, Miami, FL 33149, United States;2. Remote Sensing Systems, 444 Tenth Street, Suite 200, Santa Rosa, CA 95401, United States;3. Physical & Environmental Sciences, Texas A&M University-Corpus Christi, 6300 Ocean Drive, Corpus Christi, TX 78412, United States |
| |
| Abstract: | Air–sea gas transfer velocities are estimated for one year using a 1-D upper-ocean model (GOTM) and a modified version of the NOAA–COARE transfer velocity parameterization. Tuning parameters are evaluated with the aim of bringing the physically based NOAA–COARE parameterization in line with current estimates, based on simple wind-speed dependent models derived from bomb-radiocarbon inventories and deliberate tracer release experiments. We suggest that A = 1.3 and B = 1.0, for the sub-layer scaling parameter and the bubble mediated exchange, respectively, are consistent with the global average CO2 transfer velocity k. Using these parameters and a simple 2nd order polynomial approximation, with respect to wind speed, we estimate a global annual average k for CO2 of 16.4 ± 5.6 cm h?1 when using global mean winds of 6.89 m s?1 from the NCEP/NCAR Reanalysis 1 1954–2000. The tuned model can be used to predict the transfer velocity of any gas, with appropriate treatment of the dependence on molecular properties including the strong solubility dependence of bubble-mediated transfer. For example, an initial estimate of the global average transfer velocity of DMS (a relatively soluble gas) is only 11.9 cm h?1 whilst for less soluble methane the estimate is 18.0 cm h?1. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
