CALIPSO Status. Carl Weimer - Ball Aerospace & Technologies Corp. Mike Cisewski, Yongxiang Hu, Bill Hunt, Chip Trepte, Dave Winker – NASA LaRC Floyd Hovis - Fibertek Corp. CALIPSO –Introduction. CALIPSO Satellite Proteus Spacecraft from (CNES/Alcatel) Payload (NASA/CNES/Ball Aerospace) - PowerPoint PPT Presentation
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• CALIPSO Satellite– Proteus Spacecraft from (CNES/Alcatel)– Payload (NASA/CNES/Ball Aerospace)
• CALIPSO Payload Instruments– Wide Field Camera – Cloud Camera matched to MODIS (645 nm, 125 m pixel)– Infrared Imaging Radiometer – Three band Thermal Images (8.65, 10.6, 12.05 µm)– CALIOP – Rayleigh-Mie Lidar (laser radar) for clouds and aerosols
• CALIOP– Two Wavelengths (532 nm and 1064 nm)– Polarization sensitive at 532 nm (Photomultiplier Detectors aligned Parallel and
Perpendicular to laser linear polarization) – Polarization Accuracy ~0.5%– Polarization insensitive at 1064 nm (single Avalanche Photodiode detector)– Sensitive to single photons at 532 nm, less sensitive at 1064 nm– Dynamic range 8 million – Vertical Resolution 30 m fixed by Analog-to-Converter clock (increases in steps to
300 m in stratosphere)– Data collected for altitudes -2 km to +40 km– Laser Footprint on ground 70 m, geolocated to better than 60m– Laser pulse emitted at 20 Hz repetition (330 m spacing between laser pulses)
• Satellite and Payload are healthy, data trends are all acceptable to meet full mission requirements
– Mission complete in May 2009, Mission extension will be applied for in January 2009
– “Single String” Satellite and many new technologies as part of this “Pathfinder” mission requires careful risk management throughout program life.
• Level 2 Science Data now being released (see http://www-calipso.larc.nasa.gov/products/)
– Includes extinction for the first time– See Dave Winker’s Working Group presentation from Feb 2007 for examples of
aerosol and cloud science data.– Validation and Calibration work is ongoing
• New Data Products and capabilities are being developed– Now providing an Expedited Data set for Science Campaigns– Working to decrease data latency to support weather and air quality users.– New Products include ocean subsurface and altimetry demonstrations (Yong Hu)
• The Cox-Munk Equation relates ocean wind speed to surface reflectivity
• Was applied previously to LITE space-based lidar data by Menzies, Tratt, and Hunt
• Yong has submitted a paper showing global comparison of passive microwave system AMSR-E on Aqua to CALIPSO measured Ocean Windspeed– Preliminary results show agreement is better than 1.3 m/s rms using single
laser shots
• Trades –– Microwave systems give superior all-weather performance– CALIPSO measures over much smaller footprint (70 m vs. 20 km)– CALIPSO is calibrated using reflectivity from upper atmosphere
• Working towards using ocean surface as an independent lidar calibration and also as independent check on column aerosol extinction.