Tandem Differential Mobility Analyzer (TDMA) Data Available at the ARM Data Archive

Published: 30 April 2010

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 an external value-added product, are now available online using the ARM Data Archive’s data ordering services. Data from the TDMA, located at the ARM Climate Research Facility Southern Great Plains site, measure aerosol dry-size distribution and size-resolved hygroscopic growth rate factors (i.e., relative growth of dry aerosol particles of a given size when exposed to a relative humidity of 85%).

Installation of the TDMA began in October 2005 with data collected and delivered to the Archive in batches as field campaign data. Recent reprocessing of the data as an ARM-standardized datastream makes the TDMA a part of the ARM instrument suite. In addition, data from a value-added product of aerosol properties derived from the TDMA measurements are provided by Don Collins of Texas A & M University, as part of the TDMA data collection at the Archive. These data provide cloud condensation nuclei measurements using a process developed by Collins.

Data from the TDMA are available here, and data from the value-added product of aerosol properties derived from the TDMA measurements are available here.

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The ARM Climate Research Facility is a DOE Office of Science user facility. The ARM Facility is operated by nine DOE national laboratories, including .