Update and "first light" from the Compact Adaptable Microwave Limb Sounder (CAMLS)
Presenting Author: Nathaniel Livesey
Organization: Jet Propulsion Laboratory, Cal Inst Tech / NASA
Co-Author(s): Robert Stachnik, Jacob Kooi, Adrian Tang, Goutam Chattopadhyay, Robert Jarnot, Tim Crawford, Barry Orr, Stephen Baker Jet Propulsion Laboratory, California Institute of Technology
The Compact Adaptable Microwave Limb Sounder (CAMLS) project has developed the receiver and spectrometer hardware that form the core of a next generation Microwave Limb Sounder (MLS) instrument to extend and augment the record of observations from NASA's Upper Atmosphere Research Satellite (UARS, 1991-2000) and Aura (2004-) missions. The MLS class of instruments observe passive microwave emission from Earth's atmospheric limb in order to measure vertical profiles of atmospheric composition, humidity, temperature, cloud ice, and other parameters needed to address outstanding questions related to ozone layer recovery, climate, and air quality. The newly-developed CAMLS hardware enables a "Continuity" MLS instrument, measuring nearly all the same species as Aura MLS but requiring far less mass and power than earlier instruments (e.g., 10kg / 80W vs. 270kg / 370W for the receiver and spectrometer subsystems). CAMLS includes new 340 GHz Indium-Phosphide High Electron Mobility Transistor-based Low Noise Amplifiers along with revolutionary CMOS digital spectrometers that cover 3GHz instantaneous bandwidth with 4096 channels while consuming only ~2W. We describe the CAMLS hardware and work to integrate it into the A-SMLS ER-2 instrument to enable demonstration of TRL-6 (flights are planned for Fall 2019). In addition we show results from "first light" observations of 340GHz sky radiances from JPL's Table Mountain Facility.