Latitudinal dependence of noctilucent cloud growth

Details Latitudinal dependence of noctilucent cloud growth Latitudinal dependence of noctilucent cloud growth

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3311812k&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 11, CiteID L11812

Physics

18

Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Atmospheric Composition And Structure: Middle Atmosphere: Constituent Transport And Chemistry (3334), Cryosphere: Remote Sensing

Scientific paper

The latitudinal variation of NLC particle sizes is studied using scattered solar radiation spectra from the OSIRIS instrument onboard the Odin satellite obtained during the austral summer period 1 January-17 February 2005. We show that the particles grow moderately larger when approaching the pole, with effective optical radii of 65 nm/76 nm at latitudes of 70°/90° S. Microphysical modeling suggests that particles grow larger as a consequence of a combined effect of the temperature decrease toward the pole, the available water vapor, and meridional transport times. Interestingly, at latitudes closest to the pole, NLC particle sizes show a bi-modal structure. This structure is suggested to arise from repeated growth cycles due to extended residence times in supersaturated air.

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