RESEARCH ASSOCIATES: Dr. Bifford P. Williams

MAILING ADDRESS: Physics Department, Colorado State University,
Fort Collins, CO 80523-1875

TELEPHONE NUMBER: +1-970-491-6261; +1-970-491-7381

FAX NUMBER: +1-970-491-7947

E-MAIL ADDRESS: joeshe@lamar.colostate.edu; krueger@lamar.colostate.edu; biffw@lamar.colostate.edu

WEB SITE: http://lamar.colostate.edu/~lidar/

DATE: September 7, 2001

LIDAR LOCATION (CITY, COUNTRY, LAT., LONG.):
Fort Collins, CO (40.6N, 105W), USA

SITE ELEVATION: 1.57 km

PARAMETER(S) OR CONSTITUENT(S) MEASURED:
Temperatue, zonal and meridional wind

RESEARCH OBJECTIVES AND SPONSOR:
Investigate themal, dynamical and tidal structure of the mesopause region; long-term change studies; NSF

MEASUREMENT TECHNIQUE:
Laser induced fluorescence, frequency agile within the Na D2 Doppler spectrum

MEASUREMENT RANGE: 80 - 110 km

VERTICAL RESOLUTION: 1 km to 3 km

FREQ. OF MEASUREMENT (TYPICALLY): 5 nights per month; 24-hour capability, daytime measurement on campaign mode.

MEASUREMENT TIMES (TYPICALLY): Temporal resulution: 30min or 1hr

LASER TYPE AND WAVELENGTH (s): Tunable dye laser and pulse dye amplifier; 589nm

LASER ENERGY/PULSE: 20mJ/pulse

PULSE REPETITION RATE: 50 Hz

RECEIVER SIZE AND CONFIGURATION: Twin telescopes, 35cm dia. Zenith or 30 degree from Zenith pointing East and/or North

DETECTORS USED: PMT

SIGNAL PROCESSING: Photon Counting

ANALOG-T0-DIGITAL CONVERTER:

COMPUTER: PC

PLATFORM (if applicable):

PUBLICATIONS (5 recent and/or significant):
She, C. Y., Songsheng Chen, Zhilin Hu, J. Sherman, J. D. Vance, V. Vasoli, M. A. White, J. R. Yu, and D. A. Krueger, Eight-year climatology of nocturnal temperature and sodium density in the mesopause region (80 to 105 km) over Fort Collins, CO (41oN, 105oW), Geophys. Res. Lett., 27, 3289-3292, 2000.

Krueger, D. A., and C. Y. She, Observed "long-term" temperature change in a midlatitude mesopause region in response to external perturbation, Earth, Planets and Space, 51, 809-814, 1999.

Williams, B. P., C. Y. She, and R. G. Roble, Seasonal climatology of the nighttime tidal perturbation of temperature in the midlatitude mesopause region, Geophys. Res. Lett., 25, 3301 - 3304, 1998.

She, C. Y. and U. von Zahn, The concept of two-level mesopause: Support through new lidar observation, J. Geophys. Res., 103, 5855 - 5863, 1998.

She, C. Y., S. W. Thiel and D. A. Krueger, Observed episodic warming at 86 and 100 km between 1990 and 1997: Effects of Mount Pinatubo eruption, Geophys. Res. Lett., 25, 497 - 500, 1998.

COMMENTS: Unique Faraday filter rejects sky background permitting daytime observation; deployed Aug. 1989; regular temperature measurement since May 29th, 1991.