Berlin 2005 – wissenschaftliches Programm
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UP: Umweltphysik
UP 6: Poster: Aerosole
UP 6.13: Poster
Dienstag, 8. März 2005, 10:15–12:15, Poster TU HTF
Measurements of tropospheric NO2 with SCIAMACHY — •Andreas Richter1, Andreas Heckel1, Hendrik Nüß1, Folkard Wittrock1, Bernd Sierk2, and John P. Burrows1 — 1Institut für Umweltphysik, Universität Bremen, Otto-Hahn-Allee, D-28359 Bremen — 2Bundesamt fuer Kartographie und Geodaesie (BKG), Observatorio TIGO, Universidad de Concepcion, Concepcion, Chile
The SCIAMACHY instrument on ENVISAT provides amongst other quantities accurate nadir measurements of the UV/visible radiances scattered back from the atmosphere. From these measurements, tropospheric columns of NO2 can be retrieved using the well known DOAS method and some assumptions on the stratospheric NO2 fields.
The two main advantages of SCIAMACHY over GOME are the much better spatial resolution (up to 30 × 30 km2 compared to 320 × 40 km2) and the limb measurements that provide stratospheric profile information over each nadir pixel. Better spatial resolution improves the detection capabilities of tropospheric pollution while the stratospheric limb profiles improve the accuracy of the stratospheric NO2 fields needed in the data analysis.
In this presentation, results from 30 months of SCIAMACHY tropospheric NO2 measurements are presented. The focus is on discussion of the effects of improved spatial resolution (in particular with respect to the existing GOME data set) and the impact of the use of limb profiles for the stratospheric correction.