Dry samples are collected by the aerosol stack and transferred inside the Aerosol Observation System structure to the TDMA where they are exposed to humidity for growth rate sampling. For more details on how the TDMA works, see this [http://collinsgroup.tamu.edu/images/TDMAschematic.jpg][schematic]. ARM file photo.Over four years of data from the Tandem Differential Mobility Analyzer (TDMA), including…