In the retrieval of tropospheric NO2 columns from space borne UV/visible measurements, the separation between stratospheric and tropospheric contributions to the signal is an essential step. Up to now, the stratospheric NO2 column has been estimated using measurements over unpolluted regions and assuming that stratospheric NO2 columns do not depend on longitude. In this study, several novel approaches to extract the tropospheric contribution are presented, and first applications to GOME and SCIAMACHY data are shown. The techniques studied are separation of stratosphere and troposphere using the temperature dependence of the absorption cross-section of NO2, use of the wavelength dependence of the sensitivity to tropospheric absorptions, and use of a stratospheric chemical transport model to simulate the stratospheric NO2.
Weitere Kapitel dieses Buchs durch Wischen aufrufen
- Quantification of Tropospheric Measurements from Nadir Viewing UV/Visible Instruments
John P. Burrows
- Springer Berlin Heidelberg