No 2 Profile Retrieval Using Amaxdoas Data Atmospheric Chemistry and Physics Discussions No 2 Profile Retrieval Using Airborne Multi Axis Uv-visible Skylight Absorption Measurements over Central Europe No 2 Profile Retrieval Using Amaxdoas Data

A recent development in ground-based remote sensing of atmospheric constituents by UV/visible absorption measurements of scattered light is the simultaneous use of several directions with small elevation angles in addition to the traditional zenith-sky pointing. The different light paths through the atmosphere enable the vertical distribu-5 tion of some atmospheric absorbers such as NO 2 , BrO or O 3 to be retrieved. In this study, the amount of profile information that can be retrieved from such measurements on aircraft is investigated for the trace gas NO 2. A Sensitivity study on synthetic data is performed for a combination of four lines of sight (LOS) (0 • (nadir), 88 • , 92 • , and 180 • (zenith)) and three wavelength regions [center wavelengths: 10 362.5 nm, 437.5 nm, and 485.0 nm]. This investigation demonstrates the potential of this LOS/wavelengths setup to retrieve a significant amount of profile information from airborne multiaxis differential optical absorption spectrometer (AMAXDOAS) measurements with a vertical resolution of 3.0 to 4.5 km in the lower troposphere and 2.0 to 3.5 km near flight altitude. Above 13 km the profile information content of AMAXDOAS 15 measurements is sparse. Further, retrieved profiles with a significant amount (up to 3.2 ppbv) of NO 2 in the boundary layer over the Po-valley (Italy) are presented. Airborne multiaxis measurements are thus a promising tool for atmospheric studies in the troposphere.

[1]  R. Martin,et al.  Mapping tropospheric ozone profiles from an airborne ultraviolet-visible spectrometer. , 2005, Applied optics.

[2]  J. Burrows,et al.  SCIAMACHY validation by aircraft remote measurements: design, execution, and first results of the SCIA-VALUE mission , 2004 .

[3]  John P. Burrows,et al.  Measurements of tropospheric NO 2 with an airborne multi-axis DOAS instrument , 2004 .

[4]  Ping Wang,et al.  Retrieval of profile information from airborne multiaxis UV-visible skylight absorption measurements. , 2004, Applied optics.

[5]  Stanley C. Solomon,et al.  Measuring reactive nitrogen emissions from point sources using visible spectroscopy from aircraft. , 2003, Journal of environmental monitoring : JEM.

[6]  M. Mazière,et al.  Retrieval and characterization of ozone profiles from solar infrared spectra at the Jungfraujoch , 2002 .

[7]  Vladimir V. Rozanov,et al.  A numerical radiative transfer model for a spherical planetary atmosphere: combined differential-integral approach involving the Picard iterative approximation , 2001 .

[8]  Clive D Rodgers,et al.  Inverse Methods for Atmospheric Sounding: Theory and Practice , 2000 .

[9]  C. T. McElroy,et al.  Evidence for bromine monoxide in the free troposphere during the Arctic polar sunrise , 1999, Nature.

[10]  John P. Burrows,et al.  Retrieval of atmospheric constituents in the uv-visible: a new quasi-analytical approach for the calculation of weighting functions , 1998 .

[11]  Stanley C. Solomon,et al.  On the interpretation of zenith sky absorption measurements , 1987 .

[12]  J. Burrows,et al.  TROPOSPHERIC NO 2 FROM GOME MEASUREMENTS , 2002 .