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Preliminary comparison of the ozone vertical profiles from Umkehr and ozonesonde measurements over Poland with EOS-MLS Aura spacecraft overpasses, 2004-2005

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Ozone vertical profiles derived from Umkehr observations by the Dobson spectrophotometer at Belsk (52.50° N, 20.47° E) and from ozone soundings carried out at the nearest aerological station, Legionowo (52.24° N, 20.58° E), have been compared with those measured by the MLS instrument on board the Aura spacecraft during the sites' overpasses for the period 2004-2005. It is assumed that the satellite station distance should be less than 2° and less than 4° for the latitudinal and longitudinal difference, respectively. The bias, RMS error, and the correlation coefficients between the ozone content in the Umkehr layers have been calculated using Dobson/sonde/MLS data. The ozone mixing ratio at selected levels in the lower and mid-stratosphere (from 215 hPa up to 6.8 hPa) have been compared using the sonde/MLS data. The number of analysed daily values was ∼40 (Dobson/MLS), 60 (sonde/MLS), and 60 (Dobson/sonde) since August 2004. The comparisons show a good correspondence (bias ∼±5%, RMS <10%, correlation coefficient >0.5) between the ozone content in Umkehr layers 4-8 and ozone mixing ratio at pressures <50 hPa. At lower stratosphere (Umkehr layer 3) and upper stratosphere (Umkehr layer 9), there is also statistically significant relationship between the data, but the biases and RMS are ∼2 times larger, while the correlation coefficients are still high (>0.7).

Document Type: Research Article


Affiliations: Institute of Geophysics, Polish Academy of Sciences, Warsaw, 01-227, Poland

Publication date: January 1, 2007

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