Articles | Volume 8, issue 3
Research article
24 Mar 2015
Research article |  | 24 Mar 2015

Cloud thermodynamic phase detection with polarimetrically sensitive passive sky radiometers

K. Knobelspiesse, B. van Diedenhoven, A. Marshak, S. Dunagan, B. Holben, and I. Slutsker


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Latest update: 16 Jun 2024
Short summary
We test if ground-based sun photometers/radiometers like those in the Aerosol Robotic Network (AERONET) can use the polarization sensitivity of some instruments for improved cloud optical property retrieval. Our radiative transfer simulations show that the direction of linear polarization indicates cloud thermodynamic phase for optically thin clouds. In practice, data analysis shows a weak response with AERONET instruments, most likely due to noise and orientation/calibration ambiguity.