Speaker
Prof.
Christos Zerefos
(Academy of Athens)
Description
In view of differences found in earlier papers between trends in the lower and upper stratosphere, the presentation focuses on the intercomparison between model and observations. Results will be presented for the limited period from 1997 to 2011 comparing deseasonalized and de-QBOed lidar and SBUV/2 overpasses at Haute-Provence, Hohenpeissenberg, Table Mountain, Mauna Loa and Lauder with model simulations centered at each lidar station. The model we had available is Oslo CTM3 during the same period. This model is now being expanded to cover the period 1990-2015 whose simulations will be available in about 2 months from now. It was found a good match between the profiles derived from different methods. The same holds when comparing trends particularly from 100 hPa up to 3 hPa (about between 16 up to 40 km). Exception in the trends comparison is Mauna Loa between 10 and 5 hPa. The calculations were repeated with and without the QBO and the differences in the trends were on the order of 1% of the trend which is small. Statistical significance and possible mechanisms involved will be discussed.
Primary author
Prof.
Christos Zerefos
(Academy of Athens)
Co-authors
Dr
Amund Søvde Haslerud
(CICERO)
Prof.
Ivar Isaksen
(University of Oslo)
Dr
John Kapsomenakis
(Academy Of Athens)
Dr
Kostas Eleftheratos
(University of Athens)
Sophie Godin-Beekmann
(CNRS)
