30 August 2017 Cloud thermodynamic phase detection using an all-sky imaging polarimeter
Author Affiliations +
At any given time, clouds cover approximately 60% of the Earth’s surface and they strongly influence weather and climate; however, they are one of the largest sources of uncertainty in climate models and predictions of atmospheric effects on remote sensing measurements. Knowing the cloud thermodynamic phase – whether a cloud is composed of ice crystals or liquid particles – is critical in these applications. Knobelspiesse et al. (Atmos. Meas. Tech., 8, 1537–1554, 2015) showed theoretically that the sign of the S1 Stokes parameter can be used to detect cloud thermodynamic phase when observed with a ground-based passive polarimeter and demonstrated this principle with a zenith-viewing polarimeter. In this theory, a positive S1 value indicates a liquid cloud, while a negative S1 value indicates an ice cloud. In this paper, we report the use of our all-sky polarimeter, operating at 450 nm (10 nm band) to detect ice, liquid, and multi-layered clouds. The cloud thermodynamic phase was independently verified with a dual-polarization lidar pointed at the zenith.
Conference Presentation
© (2017) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Laura M. Dahl, Laura M. Dahl, Martin Jan Tauc, Martin Jan Tauc, Joseph A. Shaw, Joseph A. Shaw, } "Cloud thermodynamic phase detection using an all-sky imaging polarimeter", Proc. SPIE 10407, Polarization Science and Remote Sensing VIII, 104070O (30 August 2017); doi: 10.1117/12.2274354; https://doi.org/10.1117/12.2274354


General outlines of the POLDER experiment
Proceedings of SPIE (December 14 1995)
Polarization of clouds
Proceedings of SPIE (December 14 1995)
SPEX: the spectropolarimeter for planetary exploration
Proceedings of SPIE (August 05 2010)

Back to Top