ICLAS: International Coordination-group on Laser Atmospheric Studies
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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.
 
 

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