The Atmospheric Tracer Transport Model Intercomparison Project (TransCom) was created to quantify and diagnose the uncertainty in inversion calculations of the global carbon budget that result from errors in simulated atmospheric transport. TransCom was conceived at the Fourth International CO2 Conference in Carqueiranne in 1993.
The first phase of TransCom compared the model output of two different components of the carbon cycle: the fossil CO2 source and the seasonal aspect of the biospheric CO2 source
The second phase of TransCom examined the transport of sulfur hexafluoride (SF6) emissions using 11 tracer transport models.
The Atmospheric Carbon Cycle Inversion Intercomparison (TransCom 3) conducted a series of experiments in which leading chemical tracer transport models from around the world are used to calculate the global carbon budget of the atmosphere.
Two new Transcom experiments have been initiated. The first involves a comparison of upper-air model output. The second is a simulation of hourly CO2, radon and SF6 for 2002-2003 using prescribed fluxes.
