Computer Science – Sound
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.4093k&link_type=abstract
Geophysical Research Letters, Volume 27, Issue 24, p. 4093-4096
Computer Science
Sound
3
Atmospheric Composition And Structure: Middle Atmosphere-Composition And Chemistry
Scientific paper
Observations of stratospheric chlorine monoxide (ClO) were performed at the Arctic station of the ``Network for the detection of Stratospheric Change'' (NDSC). A ground based millimeter wave radiometer was routinely operated in Ny-Ålesund, Spitsbergen (78.9°N, 11.9°E). In 1998 a period with enhanced ClO in a layer around 22 km altitude was detected from February 16 to March 9. Calculations using the three dimensional chemical transport model SLIMCAT are consistent with the observations. In 1999 no significant chlorine activation was observed while SLIMCAT calculations predicted a rather strong chlorine activation in February 1999, when the polar vortex was situated above Ny-Ålesund. Deviations of SLIMCAT calculations for 1999 from the observations could be attributed to differences in temperatures obtained from the United Kingdom Meteorological office (UKMO) used in the model, and temperatures obtained from other sources. UKMO temperatures were compared to temperatures obtained from the National Center for Environmental Predictions (NCEP), the European Center for Medium Range Weather Forecast (ECMWF) and radio soundings in Ny-Ålesund. A low bias of 1 to 2 K in UKMO temperatures was detected during the preconditioning phase of the vortex air at the altitude were the ClO activation was modeled. No systematic deviation from the radio sonde temperatures were found in the other data sets. In UKMO data temperature differences reach up to 8 K during the investigated time period.
Klein Ulf
Künzi Klaus F.
Lindner Kai
Wohltmann Igno
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