TM5

global chemistry transport model

Fall 2020

From: Naus , S., Montzka, S. A., Patra, P. K., and Krol, M. C.: A 3D-model inversion of methyl chloroform to constrain the atmospheric oxidative capacity, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2020-624, in review, 2020.

This paper uses TM5-4DVAR to asses variation in the oxidative capacity of our atmosphere using measurements of methylchloroform. The figure below show variations in OH (ar more accurately k(T).OH, with k(T) the rate coefficient of the reaction between OH and methylchloroform) and ENSO. A correlation of r = -0.47 is found.

Figure 8: Variations in the annual mean ENSO MEI index (left axis) and variations in global, annual mean k(T )·OH (right axis), as derived in the REF inversion.