tdma: Tandem Differential Mobility Analyzer

The Tandem Differential Mobility Analyzer (TDMA) measures aerosol dry-size distribution and size-resolved hygroscopic growth.

In its standard operating mode, dry aerosols are separated into size bins by the first differential mobility analyzer and then exposed to 85% relative humidity. The resulting hygroscopic growth distributions are then scanned by the second differential mobility analyzer for each dry-size bin.


  • Fixed
  • AMF1
  • AMF2
  • AMF3

Related Publications


Chen H, A Hodshire, J Ortega, J Greenberg, P McMurry, A Carlton, J Pierce, D Hanson, and J Smith. 2017. "Vertically resolved concentration and liquid water content of atmospheric nanoparticles at the US DOE Southern Great Plains site." Atmospheric Chemistry and Physics, 18(1), doi:10.5194/acp-18-311-2018.
Research Highlight

Mahish M and D Collins. 2017. "Analysis of a Multi-Year Record of Size-Resolved Hygroscopicity Measurements from a Rural Site in the U.S." Aerosol and Air Quality Research, 17(6), 10.4209/aaqr.2016.10.0443.


Vogelmann AM, AM Fridlind, T Toto, S Endo, WY Lin, J Wang, S Feng, YY Zhang, DD Turner, YG Liu, ZJ Li, SC Xie, AS Ackerman, MH Zhang, and M Khairoutdinov. 2015. "RACORO continental boundary layer cloud investigations: 1. Case study development and ensemble large-scale forcings." Journal of Geophysical Research: Atmospheres, 120(12), 10.1002/2014jd022713.


Collins D. 2010. Tandem Differential Mobility Analyzer/Aerodynamic Particle Sizer (APS) Handbook. DOE/SC-ARM-TR-090.

Voyles JW. 2010. ARM Climate Research Facility Monthly Instrument Report. DOE ARM Climate Research Facility. DOE/SC-ARM-10-006.5.

Voyles JW. 2010. ARM Climate Research Facility Monthly Instrument Report. DOE ARM Climate Research Facility. DOE/SC-ARM-10-006.9.

Stolzenburg MR and PH McMurry. 2010. "Equations governing single and tandem DMA configurations and a new lognormal approximation to the transfer function." Aerosol Science and Technology, 42(6), 10.1080/02786820802157823.


Huffman JA, KS Docherty, AC Aiken, MJ Cubison, IM Ulbrich, PF DeCarlo, D Sueper, JT Jayne, DR Worsnop, PJ Ziemann, and JL Jiminez. 2009. "Chemically-resolved aerosol volatility measurements from two megacity field studies." Atmospheric Chemistry and Physics, 9(18), 10.5194/acp-9-7161-2009.

Shinozuka Y, AD Clarke, PF DeCarlo, JL Jimenez, EJ Dunlea, GC Roberts, JM Tomlinson, DR Collins, SG Howell, VN Kapustin, CS McNaughton, and J Zhou. 2009. "Aerosol optical properties relevant to regional remote sensing of CCN activity and links to their organic mass fraction: airborne observations over Central Mexico and the US West Coast during MILAGRO/INTEX-B." Atmospheric Chemistry and Physics, 9(18), 10.5194/acp-9-6727-2009.


Martin ST, T Rosenoern, Q Chen, and DR Collins. 2008. "Phase changes of ambient particles in the Southern Great Plains of Oklahoma." Geophysical Research Letters, 35(22), L22801, 10.1029/2008gl035650.

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