Submillimeter-wave Radiometers

Another heterodyne instrument has been built at the Jet Propulsion Laboratory. The Submillimeter-Wave Cloud Ice Radiometer (SWCIR) is a dedicated DC-8 instrument with receivers centered at 183, 325, 448, and 643 GHz. This 10 channel instrument has 3 double side band channels around each of the water vapor lines (183, 325, and 448 GHz ) and one channel for the 643 GHz window receiver. A talk given at the Microwave Remote Sensing specialists meeting in Boulder (11/06/2001) describes the JPL instrument and mentions the retrieval simulation testing I have performed. See the SWCIR paper for more details. The SWCIR has not yet been flown.

A submillimeter-wave Fourier transform spectrometer was developed at NASA Langley Research Center by Ira Nolt and Mike Vanek. The Far Infrared Sensor for Cirrus (FIRSC), has a cryogenically cooled bolometer detector, measures radiance spectra 10 to 50 cm-1 (300 to 1500 GHz) at 0.2 cm-1 resolution (spectral range can vary). The original FIRSC was flown on a Learjet in April to May, 1999 out of the Hampton, Virginia area. The FIRSC was upgraded for autonomous operation and integrated to the Proteus aircraft. A series of flights were made in December 2000 during the AFWEX experiment at the ARM site in Oklahoma. A paper in PDF format describes the FIRSC and presents data from the original configuration. FIRSC flew on the Proteus aircraft with NAST-I and NAST-M during CRYSTAL-FACE in July 2002. A poster (252 kB PDF) presented at the CRYSTAL-FACE Science Team meeting in Salt Lake City (2/25/03) describes analysis of FIRSC data from CRYSTAL-FACE and the evaluation of FIRSC cirrus retrievals with NAST-I infrared radiances and Cloud Radar System vertically integrated 94 GHz backscattering.

A poster (145 kB PDF) presented at the EGS-AGU conference in Nice, France (April 9, 2003) describes analysis of FIRSC and CoSSIR data from CRYSTAL-FACE, including validation with Cloud Radar System data. (Note: partially duplicates the CRYSTAL-FACE Science Team meeting FIRSC poster).

A remote sensing seminar (10/9/2001) at the University of Colorado gives an overview of the physics of submillimeter remote sensing of cirrus, the status of the instruments, the Bayesian retrieval algorithm, and results from the AFWEX FIRSC deployment. David Fillmore made the web pages from the slides.