Improving IR cloud phase determination with 20 microns spectral observations

Cloud Phase Determination Using Ground-Based AERI Observations at SHEBA

A new technique for ascertaining the thermodynamic cloud phase from high-spectral-resolution ground-based infrared measurements made by the Atmospheric Emitted Radiance Interferometer (AERI) is presented. This technique takes advantage of the differences in the index of refraction of ice and water between 11 and 19 mm. The differences in the refractive indices translate into differences in clou...

Improving Plant Safety through IR Gas Cloud Imaging

Loss of containment in the oil and gas and chemical process industries can have undesirable safety and environmental consequences. If leaks are not discovered at an early stage, they can accumulate into dangerous gas clouds that can ignite and create explosions or inflict harm as toxic agents. A recent report by British Petroleum estimates a single cavity pressure vent at an unmanned offshore p...

Space observations of cold-cloud phase change.

This study examines the vertically resolved cloud measurements from the cloud-aerosol lidar with orthogonal polarization instrument on Aqua satellite from June 2006 through May 2007 to estimate the extent to which the mixed cloud-phase composition can vary according to the ambient temperature, an important concern for the uncertainty in calculating cloud radiative effects. At -20 degrees C, the...

Frequency up-conversion based single photon, mid-IR spectral imaging with 20% quantum efficiency

0 Detection of a Far IR Excess with DIRBE at 60 and 100 Microns

From analysis of the DIRBE weekly averaged sky maps, we have detected substantial flux in the 60μm and 100μm channels in excess of expected zodiacal and Galactic emission. Two methods are used to separate zodiacal light from more distant emission. Method I makes use of the time-dependence of the North-South annual variation observed at the ecliptic poles. This method is robust against errors in...