Atmospheric Chemistry and Physics Discussions
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10.5194/acpd-7-16155-2007
http://www.atmos-chem-phys-discuss.net/7/16155/2007/
http://www.atmos-chem-phys-discuss.net/7/16155/2007/acpd-7-16155-2007.html
http://www.atmos-chem-phys-discuss.net/7/16155/2007/acpd-7-16155-2007.pdf
16155
16183
2007-11-19
Accounting for the effect of horizontal gradients in limb measurements of scattered sunlight
J. Puķīte
janis.pukite@mpch-mainz.mpg.de
S. Kühl
T. Deutschmann
U. Platt
T. Wagner
Max Planck Institute for Chemistry, J.J. Becher Weg 27, 55128 Mainz, Germany
Institute of Atomic Physics and Spectroscopy, University of Latvia, Raina Bulv. 19, Riga, 1586, Latvia
Institute of Environmental Physics, University of Heidelberg, Im Neuenheimer Feld 229, 69120 Heidelberg, Germany
Limb measurements provided by the SCanning Imaging Absorption spectrometer
for Atmospheric CHartographY (SCIAMACHY) on the ENVISAT satellite allow
retrieving stratospheric profiles of various trace gases on a global scale,
among them BrO for the first time. For limb observations in the UV/VIS
spectral region the instrument measures scattered light with a complex
distribution of light paths: the light is measured at different elevation
angles and can be scattered or absorbed in the atmosphere or reflected by the
ground. By means of spectroscopy and radiative transfer modelling the
measurements can be inverted to retrieve the vertical distribution of
stratospheric trace gases.
<br></br>
A full spherical 3-D Monte Carlo radiative transfer model "Tracy-II" is applied
in this study. The Monte Carlo method benefits from conceptual simplicity and
allows realizing the concept of full spherical geometry of the atmosphere and
also its 3-D properties, which is important for a realistic description of the
limb geometry. Furthermore it allows accounting for horizontal gradients in
the distribution of trace gases.
<br></br>
In this study the effect ofhorizontal inhomogeneous distributions of trace
gases on the retrieval of profiles from limb measurements of scattered UV/VIS
light is investigated. We introduce a method to correct for this effect by
combining consecutive limb scanning sequences and utilizing the overlap in
their measurement sensitivity regions. It is found that if horizontal
inhomogenity is not properly accounted for, typical errors of 20% for
NO<sub>2</sub> and up to 50% for OClO around the altitude of the profile peak can
arise for measurements close to the Arctic polar vortex boundary in boreal
winter.
Bovensmann H., Burrows, J. P., Buchwitz, M., Frerick, J., Nöel, S., Rozanov, V. V., Chance, K. V., and Goede, A. P. H.: SCIAMACHY: Mission objectives and measurement modes, J. Atmos. Sci., 56, 127–150, 1999.
Brühl, C. and Crutzen, P. J.: MPIC two-dimensional model, in: The Atmospheric Effect of Stratospheric Aircraft, 1292, edited by: Prather, M. J. and Remsberg, E. E., NASA Ref. Publications, pp. 103–104, 1993.
Butz A., Boesch, H., Camy-Peyret, C., Chipperfield, M., Dorf, M., Dufour, G., Grunow, K., Jeseck, P., Kühl, S., Payan, S., Pepin, I., Pu\ck\=ıte, J., Rozanov, A., von Savigny, C., Sioris, C., Wagner, T., Weidner, F., and Pfeilsticker, K.: Inter-comparison of stratospheric O<sub>3</sub> and NO<sub>2</sub> abundances retrieved from balloon borne direct sun observations and Envisat/SCIAMACHY limb measurements, Atmos. Chem. Phys., 6, 1293–1314, 2006.
Carlotti, M., Brizzi, G., Papandrea, E., Prevedelli, M., Ridolfi, M., Dinelli, B. M., and Magnani, L.: GMTR: Two-dimensional geo-fit multitarget retrieval model for Michelson Interferometer for Passive Atmospheric Sounding/Environmental Satellite observations, Appl. Opt., 45, 716–727, 2006.
Carlotti, M., Dinelli, B. M., Raspollini, P., and Ridolfi, M.: Geo-fit Approach to the Analysis of Limb-Scanning Satellite Measurements, Appl. Opt. 40, 1872–1885, 2001.
Deutschmann, T. and Wagner, T.: TRACY-II Users manual, University of Heidelberg, Heidelberg, Germany, 2007.
Dorf M., Boesch, H., Butz, A., Camy-Peyret, C., Chipperfield, M. P., Engel, A., Goutail, F., Grunow, K., Hendrick, F., Hrechanyy, S., Naujokat, B., Pommereau, J.-P., Van Roozendael, M., Sioris, C., Stroh, F., Weidner, F., and Pfeilsticker, K.: Balloon-borne stratospheric BrO measurements: Comparison with Envisat/SCIAMACHY BrO limb profiles, Atmos. Chem. Phys., 6, 2483–2501, 2006.
European Centre for Medium-Range Weather Forecasts (ECMWF): Temperature and potential vorticity analyses, Dan. Meteorol. Inst., Copenhagen, 2000.
Haley, C. S., Brohede, S. M., Sioris, C. E., Griffioen, E., Murtagh, D. P., McDade, I. C., Eriksson, P., Llewellyn, E. J., Bazureau, A., and Goutail, F.: Retrieval of stratospheric O<sub>3</sub> and NO<sub>3</sub> profiles from Odin Optical Spectrograph and Infrared Imager System (OSIRIS) limb-scattered sunlight measurements, J. Geophys. Res., 109, D16303, doi:10.1029/2004JD004588, 2004.
Krecl, P., Haley, C. S., Stegman, J., Brohede, S. M., and Berthet G.: Retrieving the vertical distribution of stratospheric OClO from Odin/OSIRIS limb-scattered sunlight measurements, Atmos. Chem. Phys., 6, 1879–1894, 2006.
Kühl, S.: Quantifying Stratospheric chlorine chemistry by the satellite spectrometers GOME and SCIAMACHY, PhD Thesis, Universität Heidelberg, Heidelberg, Germany, 177 pp., available at: http://www.ub.uni-heidelberg.de/archiv/5664/, 2005.
Kühl, S., Pu\ck\=ıte, J., Deutschmann, T., Platt, U., and Wagner, T.: SCIAMACHY Limb Measurements of NO<sub>2</sub>, BrO and OClO, Retrieval of vertical profiles: Algorithm, first results and validation, in press, doi:10.1016/j.asr.2007.10.022, Adv. Space Res., 2007.
Llewellyn E. J., Lloyd, N. D., Degenstein, D. A., Gattinger, R. L., Petelina, S. V., Bourassa, A. E., Wiensz, J. T., Ivanov, E. V., McDade, I. C., Solheim, B. H., McConnell, J. C., Haley, C. S., von Savigny, C., Sioris, C. E., McLinden, C. A., Griffioen, E., Kaminski, J., Evans, W. F. J., Puckrin, E., Strong, K., Wehrle, V., Hum, R. H., Kendall, D. J. W., Matsushita, J., Murtagh, D. P., Brohede, S., Stegman, J., Witt, G., Barnes, G., Payne, W. F., Piché, L., Smith, K., Warshaw, G., Deslauniers, D.-L., Marchand, P., Richardson, E. H., King, R. A., Wevers, I., McCreath, W., Kyrölä, E., Oikarinen, L., Leppelmeier, G. W., Auvinen, H., Mégie, G., Hauchecorne, A., Lefèvre, F., de La Nöe, J., Ricaud, P., Frisk, U., Sjoberg, F., von Schéele, F., and Nordh, L.: The OSIRIS instrument on the Odin spacecraft, Can. J. Phys., 82, 411–422, 2004.
Loughman, R. P., Griffioen, E., Oikarinen, L., Postylyakov, O. V., Rozanov, A., Flittner, D. E., and Rault, D. F.: Comparison of radiative transfer models for limb-viewing scattered sunlight measurements, J. Geophys. Res., 109, D06303, doi:10.1029/2003JD003854, 2004.
McLinden, C. A., Haley, C. S., and Sioris, C. E.: Diurnal effects in limb scatter observations, J. Geophys. Res., 111, D14302, doi:10.1029/2005JD006628, 2006.
Natarajan, M., Deaver, L. E., Thompson, E., and Magill, B.: Impact of twilight gradients on the retrieval of mesospheric ozone from HALOE, J. Geophys. Res., 110, D13305, doi:10.1029/2004JD005719, 2005.
Oikarinen, L., Sivhola, E., and Kyrölä, E.: Multiple-scattering radiance in limb-viewing geometry, J. Geophys. Res., 104, 31 261–31 274, 1999.
Pu\ck\=ıte, J., Kühl, S., Deutschmann, T., Wilms-Grabe, W., Friedeburg, C., Platt, U., and Wagner, T.: Retrieval of stratospheric trace gases from SCIAMACHY limb measurements, Proceedings of the First Atmospheric Science Conference, 8–12 May, ESA/ESRIN, Frascati, Italy, ESA SP-628, available at: http://earth.esa.int/workshops/atmos2006/participants/1148/paper_proc_Frasc_2.pdf, 2006.
Rault D. F.: Ozone profile retrieval from Stratospheric Aerosol and Gas Experiment (SAGE III) limb scatter measurements, J. Geophys. Res., 110, D09309, doi:10.1029/2004JD004970, 2005.
Ridolfi, M., Magnani, L., Carlotti, M., and Dinelli, B. M.: MIPAS-ENVISAT Limb-Sounding Measurements: Trade-Off Study for Improvement of Horizontal Resolution, Appl. Opt., 43, 5814–5824, 2004.
Rozanov, A., Bovensmann, H., Bracher, A., Hrechanyy, S., Rozanov, V., Sinnhuber, M., Stroh, F., and Burrows, J. P.: NO<sub>2</sub> and BrO vertical profile retrieval from SCIAMACHY limb measurements: sensitivity studies, Adv. Space Res., 36, 846–854., 2005.
Sinnhuber, B.-M., Rozanov, A., Sheode, N., Afe, O. T., Richter, A., Sinnhuber, M., Wittrock, F., and Burrows, J. P.: Global observations of stratospheric bromine monoxide from SCIAMACHY, Geophys. Res. Lett., 32, L20810, 2005.
Sioris, C. E., Kovalenko, L. J., McLinden, C. A., Salawitch, R. J., Van Roozendael, M., Goutail, F., Dorf, M. Pfeilsticker, K., Chance, K., von Savigny, C., Liu, X., Kurosu, T. P., Pommereau, J.-P., Bosch, H., and Frerick, J.: Latitudinal and vertical distribution of bromine monoxide in the lower stratosphere from Scanning Imaging Absorption Spectrometer for Atmospheric Chartography limb scattering measurements, J. Geophys. Res., 111, D14301, doi:10.1029/2005JD006479, 2006.
Sioris, C. E., Kurosu, T. P., Martin, R. V., and Chance, K.: Stratospheric and tropospheric NO<sub>2</sub> observed by SCIAMACHY: First results, Adv. Space Res., 34, 780–785, 2004.
Wagner, T., Burrows, J. P., Deutschmann, T., Dix, B., von Friedeburg, C., Frieß, U., Hendrick, F., Heue, K.-P., Irie, H., Iwabuchi, H., Kanaya, Y., Keller, J., McLinden, C. A., Oetjen, H., Palazzi, E., Petritoli, A., Platt, U., Postylyakov, O., Pu\ck\=ıte, J., Richter, A., van Roozendael, M., Rozanov, A., Rozanov, V., Sinreich, R., Sanghavi, S., and Wittrock, F.: Comparison of Box-Air-Mass-Factors and Radiances for Multiple-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS) Geometries calculated from different UV/visible Radiative Transfer Models, Atmos. Chem. Phys., 7, 1809–1833, 2007.