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APPENDIX E
Umkehr profiles show the vertical distribution of Ozone in the Atmosphere from ground level to
50 km.
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Ozone Density (trillions of m olecules / cubic m eter)
Using the UM.RTN, the Brewer Spectrophotometer takes Umkehr measurements through a series
of Zenith Sky samples of multiple wavelengths between solar zenith angles of 60 and 91° in the
morning and in the evening.
Data is stored in the daily 'B' file and at the End of Day is written to a daily 'U' file.
Umkehr processing software, the purpose of which is to process the Brewer raw Umkehr data into
graphable profiles, has been developed by Scientists at Environment Canada. This software is not
a KIPP & ZONEN poduct, nor does KIPP & ZONEN claim to have expertise in the area of Umkehr
processing. We will, however, endevour to provide whatever information we can to assist users in
the generation of ozone profiles for their stations, and the following discussion is a first attempt.
This Appendix briefly describes the steps necessary to process Umkehr Data. For further expert
assistance, especially as concerns the quality of data, and station dependent parameters, it is
suggested that WMO or EC scientists be consulted.
For a more in-depth discussion of the theory and practicalities of Umkehr measurements and
presentation, experts at Environment Canada or the WOUDC should be consulted.
UMKEHR PROCESSING
Umkehr Ozone Profile
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MKIII OPERATOR'S MANUAL
APPENDIX E UMKEHR PROCESSING
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