Quantifying the Impact of Atmospheric Transport Uncertainty on CO₂ Surface Flux Estimates.

ABSTRACT: We show that transport differences between two commonly used global chemical transport models, GEOS-Chem and TM5, lead to systematic space-time differences in modeled distributions of carbon dioxide and sulfur hexafluoride. The distribution of differences suggests inconsistencies between the transport simulated by the models, most likely due to the representation of vertical motion. We further demonstrate that these transport differences result in systematic differences in surface CO₂ flux estimated by a collection of global atmospheric inverse models using TM5 and GEOS-Chem and constrained by in situ and satellite observations. While the impact on inferred surface fluxes is most easily illustrated in the magnitude of the seasonal cycle of surface CO₂ exchange, it is

SUBMITTER: Schuh AE 

PROVIDER: S-EPMC6582606 | biostudies-literature | 2019 Apr

REPOSITORIES: biostudies-literature