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Ozone Theme Meeting 2009:
Ozone absorption cross sections


WMO Headquarters, Geneva
11-13 May 2009

Deadline for registration: 27 February



The “Ozone Theme Meetings” aim to provide a platform for scientists working in atmospheric ozone science. The meetings particularly should allow for discussions for scientists engaged in different communities, such as NDACC, GAW and the satellite community. The first Ozone Theme Meeting was successfully arranged in 2008 at WMO. We welcome you to participate in the Second Ozone Theme Meeting in May 11-13, 2009 in WMO, Geneva.

The Ozone Theme Meeting 2009 is organized by IGACO-O3/UV and it is devoted to ozone absorption cross sections. The aim of the meeting is to discuss the possible replacement of ozone absorption cross sections (and the related temperature dependencies) of Bass and Paur (1985) in the Huggins band. It was found, that these data are not optimal for processing TOMS satellite data. Ozone absorption cross sections of Bass and Paur are presently used as spectroscopic values for retrieval of many instruments, operated from ground (Dobson and Brewer spectrophotometers and DIAL/LIDAR instruments) as well as from space (such as TOMS, SBUV, GOME and OMI). The use of different ozone absorption cross sections for different instruments would severely complicate the comparability of atmospheric ozone measurements from different platforms and should be avoided. However, the accuracy of laboratory measurements of ozone absorption cross sections (including their temperature dependencies) seems to be a limiting factor for accuracies of many atmospheric ozone measurements.

A team of experts working under the umbrella of WMO and IO3C will evaluate the ozone cross sections in Huggins band and explore the possibilities to replace Bass and Paur data with more suitable spectroscopic data.

In addition to UV cross sections we also aim to discuss topics related to ozone cross sections at longer wavelength regions, including VIS, IR and microwave, as well. There is some indication that one of the problems in combining and comparing ozone data measured by different instruments is due to the discrepancy in the absorption cross sections in different wavelength regions.

In the meeting we expect that experts in measurements of the various instruments as well as members of the expert team will participate in order to enable fruitful scientific discussions. We encourage you to present results of related studies; in this case please submit a short abstract to Geir Braathen ( by 27 February 2009. In order to guarantee lively and open discussion we plan to limit the number of participants to about 35 scientists.



Click here to download the MS Excel file with tre provisional agenda.


Hotel Reservation

Due to a lot of pressure on the Geneva hotels in mid May we have not been able to secure block bookings at our regular hotels. You can find hotels in Geneva by consulting any of these three web sites:

The two hotels closest to WMO are Hotel Eden and Hotel Mon Repos. They are within 3-5 min walking distance from WMO.


Local Information for Participants

Please visit the page "visitors' info" on the left side of this page. Then on the right hand side you can find logistics information.


Dr Geir Braathen, Atmospheric Environment Research Division, WMO Research Department

Tel: + 41 22 730 8235

We wish you a warm welcome to the Ozone Theme Meeting in May 2009.

On behalf of the IGACO-O3/UV theme office,

Johanna Tamminen              Geir Braathen                        Johannes Staehelin
FMI                                        WMO                                     ETHZ








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