Physics
Scientific paper
Aug 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.530..295v&link_type=abstract
In: 16th ESA Symposium on European Rocket and Balloon Programmes and Related Research, 2 - 5 June 2003, Sankt Gallen, Switzerlan
Physics
3
Earth Atmosphere: Physics, Earth Atmosphere: Chemistry
Scientific paper
We present a concise review of Northern hemisphere groundbased observations of NLC altitudes, from which we derive an unexpected small temporal variation of these altitudes. We use the 3-dim COMMA/IAP model to predict a decrease of NLC altitude by 1.2 km induced by a change in CO2 mixing ratio from 295 ppmv (as prevailing in the 1890s) to 360 ppmv (as prevailing 1995). We critically examine the mean NLC altitude as published by Jesse [1896] and propose a revised value of 82.4±0.4 km for the epoch of Jesse's work. The chosen error bar implies that the magnitude of the model-predicted drop of NLC altitude over the past century is well outside the error bars of the altitude measurements.
Berger Uwe
von Zahn Ulf
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