Net sea–air CO2 flux uncertainties in the Bay of Biscay based on the choice of wind speed products and gas transfer parameterizations

[摘要] The estimation of sea–air CO₂ fluxes is largely dependent on windspeed through the gas transfer velocity parameterization. In this paper, wequantify uncertainties in the estimation of the CO₂ uptake in the Bayof Biscay resulting from the use of different sources of wind speed such as threedifferent global reanalysis meteorological models (NCEP/NCAR 1, NCEP/DOE 2and ERA-Interim), one high-resolution regional forecast model(HIRLAM-AEMet), winds derived under the Cross-Calibrated Multi-Platform(CCMP) project, and QuikSCAT winds in combination with some of the mostwidely used gas transfer velocity parameterizations. Results show that netCO₂ flux estimations during an entire seasonal cycle(September 2002–September 2003) may vary by a factor of ~ 3 depending on the selectedwind speed product and the gas exchange parameterization, with the highestimpact due to the last one. The comparison of satellite- and model-derivedwinds with observations at buoys advises against the systematicoverestimation of NCEP-2 and the underestimation of NCEP-1. In the coastalregion, the presence of land and the time resolution are the main constraintsof QuikSCAT, which turns CCMP and ERA-Interim in the preferred options.

[学科分类] 地球化学与岩石