Atmospheric Radiation Measurement Climate Research Facility US Department of Energy

caps-pmex > Cavity Attenuated Phase Shift Extinction MonitorInstrument Type(s) > Baseline • Guest

The cavity attenuated phase shift extinction monitor is an optical extinction spectrometer that measures aerosols, broadband scatterers and absorbers of light that interact with solar radiation and influence the Earth’s radiation balance. The CAPS PMex uses a visible-light-emitting diode (LED), a sampling cell incorporating two high-reflectivity mirrors centered at the wavelength of the LED, and a vacuum photodiode detector.

Primary Derived Measurements

Locations

  • Fixed
  • AMF1
  • AMF2
  • AMF3

Active Locations

Facility Name Start Date
Lamont, OK (Extended and Co-located with C1) 2016-11-15
Graciosa Island, Azores, Portugal 2014-02-18

2021

Brown H, X Liu, R Pokhrel, S Murphy, Z Lu, R Saleh, T Mielonen, H Kokkola, T Bergman, G Myhre, R Skeie, D Watson-Paris, P Stier, B Johnson, N Bellouin, M Schulz, V Vakkari, J Beukes, P van Zyl, S Liu, and D Chand. 2021. "Biomass burning aerosols in most climate models are too absorbing." Nature Communications, 12(1), 10.1038/s41467-020-20482-9.
Research Highlight

2020

Flynn C, D Chand, B Ermold, and A Koontz. 2020. The ARM Aerosol Optical Properties (AOP) Value-Added Product. Ed. by Robert Stafford, ARM user facility. DOE/SC-ARM-TR-211.

Kleinman L, A Sedlacek III, K Adachi, P Buseck, S Collier, M Dubey, A Hodshire, E Lewis, T Onasch, J Pierce, J Shilling, S Springston, J Wang, Q Zhang, S Zhou, and R Yokelson. 2020. "Rapid evolution of aerosol particles and their optical properties downwind of wildfires in the western US." Atmospheric Chemistry and Physics, 20(21), 10.5194/acp-20-13319-2020.

2018

Forestieri S, T Helgestad, A Lambe, L Renbaum-Wolff, D Lack, P Massoli, E Cross, M Dubey, C Mazzoleni, J Olfert, A Sedlacek III, A Freedman, P Davidovits, T Onasch, and C Cappa. 2018. "Measurement and modeling of the multiwavelength optical properties of uncoated flame-generated soot." Atmospheric Chemistry and Physics, 18(16), 10.5194/acp-18-12141-2018.

2016

Dubey M, A Aiken, LK Berg, A Freedman, and K Gorkowski. 2016. Two-Column Aerosol Project: Aerosol Light Extinction Measurements Field Campaign Report. Ed. by Robert Stafford, DOE ARM Climate Research Facility. DOE/SC-ARM-16-047.


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