Physics
Scientific paper
Feb 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22..381l&link_type=abstract
Geophysical Research Letters, Volume 22, Issue 4, p. 381-384
Physics
17
Atmospheric Composition And Structure: Aerosols And Particles, Atmospheric Composition And Structure: Cloud Physics And Chemistry, Atmospheric Composition And Structure: Transmission And Scattering Of Radiation, Ionosphere: Polar Cap Ionosphere
Scientific paper
During 3 out of 16 observations runs in July and August 1993 the Rayleigh Lidar at the Andøya Rocket Range (69°N, 16°E) in Northern Norway detected aerosol echoes from noctilucent cloud altitudes on July 28, August 7, and August 9. The geometric elevation of the center of the Sun was from +1.3° to -4.5° during aerosol detection. These three events differed significantly in peak signal strength, altitude, cloud layer shape, altitude integrated signal, and temporal evolution. Aerosol echoes were seen from the altitude range 81 to 87 km. The strongest aerosol event showed a peak backscatter ratio of 240 at 83.2 km altitude equivalent to the molecular (Rayleigh) scattering signal from 41.5 km. The weakest event had a peak backscatter ratio of 7 at 84.8 km with a Rayleigh equivalent altitude of 73.3 km. The zenith optical thickness of the aerosol layers varied by approximately two orders of magnitude. Detection times ranged from longer than 5 hours to as short as 15 minutes. The temporal evolution durng the events suggests that single clouds were drifting through the laser beam which has a diameter of approximately 4 m at 85 km altitude. All events occurred before local midnight and the gross temporal evolution is compatible with tidal models for the diurnal variation of the visibility in PMCs and NLCs although there is considerably more structure in the lidar data than predictable by such a model. The estimated zenith optical thickness is within the bounds of microphysical NLC models.
Fricke Karl-Heinrich
Langer Mark
Müller K. P.
No associations
LandOfFree
Rayleigh Lidar detection of aerosol echoes from noctilucent cloud altitudes at the Arctic Circle does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Rayleigh Lidar detection of aerosol echoes from noctilucent cloud altitudes at the Arctic Circle, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rayleigh Lidar detection of aerosol echoes from noctilucent cloud altitudes at the Arctic Circle will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1634860