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
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:
355 nm Aerosol Elastic Backscatter, Water Vapor Mixing Ratio from Raman backscatter of H2O and N2 (407/386) nm. Hygroscopic growth measurements/studies of urban aerosols. Planetary Boundary Layer Height and Dynamics.
RESEARCH OBJECTIVES AND SPONSOR:
Raman lidar measurements to measure the vertical distribution of aerosols and water vapor over the Baltimore-Washington metro area, understand the transport of particulates and air pollutants, and characterization of water vapor and aerosol variability on a sub-pixel scale using ground-based Raman lidar systems stationed at UMBC, Beltsville and GSFC.
MEASUREMENT TECHNIQUE:
Elastic and Raman (H2O and N2) backscatter lidar
MEASUREMENT RANGE: 500 m to 7 km
VERTICAL RESOLUTION: 37 m
FREQ. OF MEASUREMENT (TYPICALLY): Night observations.
MEASUREMENT TIMES (TYPICALLY):
Data acquisition begins at sundown at lasts for a minimum of 5 hours or until sunrise.
LASER TYPE AND WAVELENGTH (s): Nd:YAG 355 nm
LASER ENERGY/PULSE: 4-6 Watts
PULSE REPETITION RATE: 30 Hz
RECEIVER SIZE AND CONFIGURATION:
Schmidt-Cassegrain telescope 0.4m (primary mirror)
DETECTORS USED: Thorn EMI 9813QB photomultiplier tube
SIGNAL PROCESSING:
Philips Scientific 300 MHz discriminator
ANALOG-TO-DIGITAL CONVERTER: Santa Fe Research multiscalar boards 4 MHz
COMPUTER: 550 MHz PC compatible
PLATFORM (if applicable): Labview VI (OS:Windows 98)
PUBLICATIONS (5 recent and/or significant):
Rogers R., “Raman Lidar Measurements of Hygroscopic Effects on Aerosol Extinction”, Ph. D Thesis, 2007. |