RESEARCH ASSOCIATES: Dr. Syed Ismail, Dr. William B. Grant, Dr. Richard A. Ferrare, Dr. Johnathan W. Hair, Dr. Russell J. DeYoung, Carolyn F. Butler, Marta A. Fenn, Susan A. Kooi, Vince G. Brackett, Marian B. Clayton, Anthony Notari, Lorraine Brasseur, Jerry A. Williams, William J. McCabe, George V. Insley, Jr., Nicolas A. Kepics, and many others at NASA Langley.

MAILING ADDRESS: MS 401A, NASA Langley Research Center, Hampton, VA 23681-2199 USA

TELEPHONE NUMBER: 1-757-864-1273

FAX NUMBER: 1-757-864-7790

E-MAIL ADDRESS: e.v.browell@larc.nasa.gov

WEB SITE: http://asd-www.larc.nasa.gov/lidar/lidar.html and
http://asd-www.larc.nasa.gov/lidar/bio/browell.html

DATE: 9-18-2001

LIDAR LOCATION: Airborne lidars - Home at Hampton, VA, USA, 370N, 760W

SITE ELEVATION: Laboratory at sea level for occasional ground tests, lidar systems are operated primarily on-board aircraft

PARAMETER(S) OR CONSTITUENT(S) MEASURED: UV DIAL (Differential Absorption Lidar): Ozone, aerosol, and clouds above and below aircraft (DC-8, P-3, or C-130); LASE (Lidar Atmospheric Sensing Experiment): Water vapor , aerosols, and clouds above and below aircraft (DC-8, P-3, or ER-2); CO2 DIAL system under test and evaluation

RESEARCH OBJECTIVES AND SPONSOR: NASA global studies of tropospheric and stratospheric chemistry and meteorological and radiative studies associated with severe storms and climate change.

MEASUREMENT TECHNIQUE: Differential Absorption Lidar (DIAL)

MEASUREMENT RANGE: DC-8 aircraft (+/- 12 km for aerosols, 12 km (nadir) and 5 km (zenith) for ozone and water vapor.

VERTICAL RESOLUTION: 30 m aerosol, 300 m for ozone, 200-1000 m water vapor

FREQ. OF MEASUREMENT (TYPICALLY): Measurements associated with major international airborne field missions conducted about once very year for each system.

MEASUREMENT TIMES (TYPICALLY): During field missions, day and night flights

LASER TYPE AND WAVELENGTH (s): UV DIAL: Nd:YAG-pumped dye lasers operating at 289 and 300 nm; LASE: Nd:YAG-pumped Ti:sapphirelaser operating at 815 nm

LASER ENERGY/PULSE: UV DIAL: 30 mJ UV, 40 mJ VIS, 150 mJ IR; LASE: 100-120 mJ

PULSE REPETITION RATE: UV DIAL: 30 Hz; LASE: 5 Hz

RECEIVER SIZE AND CONFIGURATION: 16" Dall-Kirkham

DETECTORS USED: UV DIAL: UV and VIS PMT's and IR APD; LASE: Si:APD

SIGNAL PROCESSING: UV DIAL & LASE: Multi-detector/digitizer covering a signal dynamic range 106

ANALOG-T0-DIGITAL CONVERTER: UV DIAL & LASE: DSP 12-bit

COMPUTER: DEC Alpha

PLATFORM (if applicable): DC-8, P-3, ER-2 (LASE only)

PUBLICATIONS (selected recent):
Large-scale air mass characteristics observed over the Western Pacific during summertime, E. V. Browell et al., J. Geophys. Res., 101, 1691-1712, 1996.

Ozone and aerosol distributions and air mass characteristics over the South Atlantic Basin during the burning season, E. V. Browell et al., J. Geophys. Res., 101, 24,043-24,068, 1996.

Differential Absorption Lidar (DIAL) measurements from air and space, E. V. Browell, S. Ismail, W. B. Grant, Appl. Phys.-B, 67, 399-410, 1998.

Ozone and aerosol distributions and air mass characteristics over the South Pacific during the burning season, M. A. Fenn, E. V. Browell et al., J. Geophys. Res., 104, 16,197-16,212, 1999.

LASE measurements of aerosol and water vapor profiles during TARFOX, S. Ismail, E. V. Browell, et al., J. Geophys. Res.,105, 9903-9916, 2000.

A case study of transport of tropical marine boundary layer and lower tropospheric air masses to the northern midlatitude upper troposphere, W. B. Grant, E. V. Browell et al., J. Geophysical Res., 105, 3757-3769, 2000.

Large-scale air mass characteristics observed over the remote tropical Pacific Ocean during March-April 1999: Results from PEM Tropics B Field Experiment, E. V. Browell et al., J. Geophys. Res., 106, in press, 2001.

See full list of publications at http://asd-www.larc.nasa.gov/lidar/pub.html

COMMENTS: We develop and apply advanced airborne and spaceborne lidar systems for global investigations of ozone, water vapor, aerosols and clouds, and we have applied these systems in over 30 major field experiments all over the world.