RESEARCH ASSOCIATES:
Dr. Jennifer Comstock
Albert Mendoza
Brian Ermold
Dr. James Mather

MAILING ADDRESS:
Battelle NW, PNNL for U.S. DOE
790 6th Street

TELEPHONE NUMBER:
509-375-2041

FAX NUMBER:
509-271-0030

E-MAIL ADDRESS:
Connor.Flynn@arm.gov

WEB SITE: http://playground.arm.gov/~widener/parsl/parsl_instruments.htm

DATE: 2001-08-29

LIDAR LOCATION (Richland WA, USA, latitude 46:17:38N, longitude 119:17:27W):

SITE ELEVATION: 359 feet, 109 meters

PARAMETER(S) OR CONSTITUENT(S) MEASURED:
Polarization diverse elastic backscatter at 532 nm, multiple FOV from zenith to horizon.

RESEARCH OBJECTIVES AND SPONSOR:
Cloud and aerosol detection
Cloud and aerosol optical depth
Phase discrimination
Effective particle size

MEASUREMENT TECHNIQUE:
Elastic backscatter for cloud and aerosol detection
Slant-sensing retrievals for cloud and aerosol optical depth
Depolarization profiles for phase discrimination
Depolarization vs scan angle for particle orientation
Combined lidar/radiometer "lirad" retrievals of microphysics
Combined lidar/radar retrievals of cloud microphysics

MEASUREMENT RANGE: 0-30 km

VERTICAL RESOLUTION: ~10 meters

FREQ. OF MEASUREMENT (TYPICALLY): Continuous

MEASUREMENT TIMES (TYPICALLY): 5-10 seconds

LASER TYPE AND WAVELENGTH (s): doubled Nd-YAG, 532 nm

LASER ENERGY/PULSE: 100 mJ
PULSE REPETITION RATE: 1000 Hz

RECEIVER SIZE AND CONFIGURATION: 12.5" co-axial transmit and receive

DETECTORS USED: Single-Photon Counting Modules SPCM-APD from Perkin-Elmer

SIGNAL PROCESSING: AMSC-5 from ASRC

ANALOG-T0-DIGITAL CONVERTER: National Instruments PCI 6031E

COMPUTER: Ampro Little Board P6d Single-Board Computer

PLATFORM (if applicable): Win98 SR2

PUBLICATIONS: Conference proceeding at the AWMA Regional Aerosol Conference in Bend, OR. Oct 2001.

COMMENTS: This lidar will be deployed as part of IMPROVE II through November and December 2001. Following IMPROVE II, the lidar will be augmented with a second wavelength capability of 351 nm (tripled Nd-YLF by Photonix) permitting more sensitive aerosol detection as well as direct extinction determination via concurrent measurement of the nitrogen gas Raman-scattering at 379 nm.