R1 MOZART-4 results for ARCTAS and ARCPAC MOZART-4 is described in: Emmons, L. K., et al., Description and evaluation of the Model for Ozone and Related chemical Tracers, version 4 (MOZART-4), Geosci. Model Dev. Discuss., 2, 1157-1213, 2009 (http://www.geosci-model-dev-discuss.net/2/1157/2009/gmdd-2-1157-2009.html). The MOZART-4 R1 results archived here are from simulations using NCEP/GFS meteorology. The emissions are based on David Streets' ARCTAS-v1.2 emissions and Christine Wiedinmyer's daily fire emissions (version June 2009). The files for ARCTAS-A and -B flights with these emissions are labeled 'MOZART4gfst85' and are from a simulation at 1.4x1.4 degrees (T85) horizontal resolution. For the CARB flights, a separate simulation was performed where California emissions were replaced with the CARB emissions inventory. This run was at 0.7x0.7 degrees (T170) and the files are labeled 'MOZART4gfst170'. Please contact Louisa Emmons (emmons@ucar.edu) if you have any questions or if you make use of these files. Any questions about the ARCTAS-CARB results can be directed to Gabriele Pfister (pfister@ucar.edu).