LIDAR RESEARCHER:
Dr. Raymond M. Hoff
RESEARCH ASSOCIATES:
Dr. Kevin McCann
Ruben Delgado
Patricia Sawamura
MAILING ADDRESS:
University of Maryland, Baltimore County
Physics Department
1000 Hilltop Circle
Baltimore, MD 21250
TELEPHONE NUMBER: 410-455-1610, 1942, 1943
FAX NUMBER: 410-455-1291
E-MAIL ADDRESS: hoff@umbc.edu
WEB SITE: http://alg.umbc.edu/usaq/archives/cat_lidar.html
DATE: 2001
LIDAR LOCATION (CITY, COUNTRY, LAT., LONG.):
Catonsville, MD (39.25455°N, -79.7094°W)
SITE ELEVATION: 81 m AGL
PARAMETER(S) OR CONSTITUENT(S) MEASURED: 532 and 1064 nm Aerosol Elastic Backscatter, 532 nm Depolarization and 1064/532 Color Ratio, 532 nm Extinction and Aerosol Optical Depth. Planetary Boundary Layer Height and Dynamics.
RESEARCH OBJECTIVES AND SPONSOR: Integration of the ground-based lidar products with satellite remote sensing instruments such as the Moderate Resolution Imaging Spectrometer (MODIS), the Ozone Monitoring Instrument (OMI), the Geostationary Operational Environmental Satellite (GOES-11, 12), and the Cloud and Aerosol Lidar for Pathfinder Spaceborne Observations (CALIPSO) to develop a 3-D view of pollutants over the region. Results obtained contribute to atmospheric modeling and satellite efforts in the understanding of regional pollution dynamics for state and federal agencies such as NASA, NOAA, EPA and the Maryland Department of the Environment.
MEASUREMENT TECHNIQUE: Elastic Backscatter (532 and 1064 nm)
MEASUREMENT RANGE: 300 m to 15 km
VERTICAL RESOLUTION: 15 m
FREQ. OF MEASUREMENT (TYPICALLY): Daily observations, except on rain and snowy days.
MEASUREMENT TIMES (TYPICALLY): Data acquisition begins at 15:00 UTC, for minimum of 5 hours. Summer operation lasts a minimum of 8 hours, beginning ~13:00 UTC. Continuous observations during multiday polluted events (US Air Quality Action Days).
LASER TYPE AND WAVELENGTH (s): Nd:YAG 532/1064 nm
LASER ENERGY/PULSE: 3 Watts
PULSE REPETITION RATE: 10 Hz
RECEIVER SIZE AND CONFIGURATION:
Schmidt-Cassegrain telescope 0.4m (primary mirror)
DETECTORS USED:
Hamamatsu H6780 photomultiplier tube and Analog Modules 710-427 APD
SIGNAL PROCESSING:
ANALOG-TO-DIGITAL CONVERTER: Gage 12100 Series Digitizer Card
COMPUTER: 550 MHz PC compatible
PLATFORM (if applicable): Labview VI (OS:Windows 98)
PUBLICATIONS (5 recent and/or significant):
- Bösenberg, J. and R. M. Hoff (2008). Plan for the implementation of the GAW Aerosol Lidar Observation Network (GALION), World Meteorological Report #178, WMO Geneva, Switzerland.
- Delgado, R., Weldegaber, M., Woodman, M., Seybold, M., Demoz, B., McCann, K. J. and Hoff, R. M., 2008. Elastic Lidar Measurements of Low Level Jet Events over Baltimore, 24th International Laser Radar Conference Proceedings, Boulder, Colorado, pp. 305-308.
- McMillan, W. W., J. X. Warner, M. M. Comer, E. Maddy, A. Chu, L. Sparling, E. W. Eloranta, R. M. Hoff, G. Sachse, C. Barnet, I. A. Razenkov, and W. Wolf (2008) AIRS views of transport from 12-22 July 2004 Alaskan/Canadian fires: Correlation of AIRS CO and MODIS AOD with forward trajectories and comparison of AIRS CO retrievals with DC-8 in situ measurements during INTEX-A/ICARTT, J. Geophys. Res., 113, D20301, doi:10.1029/2007JD009711.
- Engel-Cox, Jill A., Raymond M. Hoff, Raymond Rogers, Fred Dimmick, Alan C. Rush, James J. Szykman, Jassim Al-Saadi, D. Allen Chu, and Erica R. Zell, 2006. Integrating Lidar and Satellite Optical Depth with Ambient Monitoring for 3-Dimensional Particulate Characterization, Atmos. Environ. 40, 8056-8067.
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