Speaker
Christian Rolf
(Forschungszentrum Jülich)
Description
The JULIA (the Jülich In-Situ Airborne) data base comprises water vapor measurements from more than 50 research aircraft field campaigns spanning over a time period more than 20 years starting in 1997.
We analyzed the JULIA water vapor data set together with JETPAC Merra2 meteorological data in the frame of the SPARC OCTAVE-UTLS initiative. We show that water vapor variability in the UTLS was best reduced if using a combination of jet-based and tropopause based coordinates. A persistent variability of H2O below Theta=350K remains and can't be reduced by coordinate transformations. Trend estimates therefore remain highly uncertain below 350K, but show indications for slightly negative trend of H2O in the LMS.
Primary authors
Christian Rolf
(Forschungszentrum Jülich)
Martina Krämer
(Forschungszentrum Jülich)
