arifein/offline-drydep: Offline dry deposition model from GEOS-Chem v1.0

Offline dry deposition model from GEOS-Chem, used in Feinberg et al. (2022): Evaluating atmospheric mercury (Hg) uptake by vegetation in a chemistry-transport model, Environmental Science: Processes & Impacts, https://doi.org/10.1039/D2EM00032F.

This model is a python implementation of the GEOS-Chem dry deposition scheme, based on Wang et al., doi:10.1029/98JD00158 (1998) and Wesely, doi:10.1016/0004-6981(89)90153-4 (1989). To compare with measurement sites, the model's landcover data is adjusted so that 100% of the grid cell is covered with the observed land type. Meteorological and leaf area index input data can be downloaded from http://geoschemdata.wustl.edu/.