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Presentation transcript:

Ball Aerospace & Technologies Corporation - cweimer@ball.com CALIPSO Status Carl Weimer - Ball Aerospace & Technologies Corp. Mike Cisewski, Yongxiang Hu, Bill Hunt, Chip Trepte, Dave Winker – NASA LaRC Floyd Hovis - Fibertek Corp. Ball Aerospace & Technologies Corporation - cweimer@ball.com

CALIPSO –Introduction 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) Ball Aerospace & Technologies Corporation - cweimer@ball.com

CALIPSO Satellite & Payload Lidar Receiver Telescope Star Tracker Assembly Wide Field Camera Imaging Infrared Radiometer Integrated Lidar Transmitter Ball Aerospace & Technologies Corporation - cweimer@ball.com

Lidar Core – Transmitter and Receiver Etalon Filter Adjustable Boresight Mechanism APD PMTs Laser Radiator Optical Bench Laser Optics Modules - Fibertek Telescope – 1 meter Beryllium Beam Expander Optics ILT (Integrated Lidar Transmitter) ILR (Integrated Lidar Receiver) Ball Aerospace & Technologies Corporation - cweimer@ball.com

CALIPSO Laser Status Always the First Questioned Asked Completed One Billion Laser Shots On-Orbit Feb 3! Only have operated one laser, second laser held in reserve. Ball Aerospace & Technologies Corporation - cweimer@ball.com

Ball Aerospace & Technologies Corporation - cweimer@ball.com CALIPSO Summary 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) Ball Aerospace & Technologies Corporation - cweimer@ball.com

One New Application of CALIPSO - Ocean Windspeed 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. Ball Aerospace & Technologies Corporation - cweimer@ball.com

AMSR-E Winds vs CALIPSO Winds Ball Aerospace & Technologies Corporation - cweimer@ball.com

Global Comparison Between CALIPSO and AMSR-E (AQUA) Wind speeds Residual Windspeed Error for CALIPSO arises from aerosol loss. Possible instrument effects being studied. Ball Aerospace & Technologies Corporation - cweimer@ball.com