Three-parameter size distributions of NLC particles as measured by the ALOMAR Rayleigh/Mie/Raman lidar

Details Three-parameter size distributions of NLC particles as measured by the ALOMAR Rayleigh/Mie/Raman lidar Three-parameter size distributions of NLC particles as measured by the ALOMAR Rayleigh/Mie/Raman lidar

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsa24a..08b&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SA24A-08

Physics

3360 Remote Sensing, 0305 Aerosols And Particles (0345, 4801), 0320 Cloud Physics And Chemistry, 0340 Middle Atmosphere: Composition And Chemistry

Scientific paper

The Rayleigh/Mie/Raman lidar of the ALOMAR observatory (located at 69 degrees N) can measure the backscatter coefficient of noctilucent clouds (NLC) and its altitude dependence in full daylight and at any local time throughout the Arctic summer at the wavelength of 532 nm. For medium and strong NLC, it can do so also at the additional wavelengths of 355 nm and 1064 nm. It so happens that in this wavelength range, scatter from the optically active NLC particles significantly deviates from Rayleigh scatter. It is this deviation from Rayleigh scatter which allows the determination of a size distribution through the measurement of backscatter coefficients at three different wavelenghts. Since 1998, the ALOMAR Rayleigh/Mie/Raman lidar has the required capability of daylight observations of NLC in three widely separated wavelengths and we have observed quite a number of NLC events for which particle size distributions could be determined. In our data analysis, we presume the NLC particles to be spherical, to consist of ice and to follow a lognormal size distribution. The latter is described by an absolute particle number density, a median radius and a radius distribution width. We will report on the results of these measurements.

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