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Oclo Slant Column Densities Derived from Gomos Averaged Transmittance Measurements : Volume 6, Issue 11 (04/11/2013)

By Tétard, C.

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Book Id: WPLBN0003999218
Format Type: PDF Article :
File Size: Pages 12
Reproduction Date: 2015

Title: Oclo Slant Column Densities Derived from Gomos Averaged Transmittance Measurements : Volume 6, Issue 11 (04/11/2013)  
Author: Tétard, C.
Volume: Vol. 6, Issue 11
Language: English
Subject: Science, Atmospheric, Measurement
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2013
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Fussen, D., Bertaux, J., De Miguel, L. S., D'andon, O. F., Barrot, G., Vanhellemont, F.,...Mateshvili, N. (2013). Oclo Slant Column Densities Derived from Gomos Averaged Transmittance Measurements : Volume 6, Issue 11 (04/11/2013). Retrieved from http://www.ebooklibrary.org/


Description
Description: Institut d'Aéronomie Spatiale de Belgique, Brussels, Belgium. The Global Ozone Monitoring by Occultation of Stars (GOMOS) instrument on board the European platform ENVISAT (ENVironment SATellite) was dedicated to the study of the of Earth's atmosphere using the stellar occultation technique. The spectral range of the GOMOS spectrometer extends from the UV (ultra violet) to the near infrared, allowing for the retrieval of species such as O3, NO2, NO3, H2O, O2, air density, aerosol extinction and OClO. Nevertheless, OClO cannot be retrieved using a single GOMOS measurement because of the weak signal-to-noise ratio and the small optical thickness associated with this molecule. We present here the method used to detect this molecule by using several GOMOS measurements. It is based on a two-step approach. First, several co-located measurements are combined in a statistical way to build an averaged measurement with a higher signal-to-noise ratio; then, a differential optical absorption spectroscopy (DOAS) method is applied to retrieve OClO slant column densities (SCD). The statistics of the sets of GOMOS measurements used to build the averaged measurement and the spectral window selection are analyzed. The obtained retrievals are compared to results from two balloon-borne instruments. It appears that the inter-comparisons of OClO are generally satisfying (relative differences are about 15–60%). Two nighttime climatologies of OClO based on GOMOS averaged measurements are presented. The first depicts annual global pictures of OClO from 2003 to 2011. From this climatology, the presence of an OClO SCD peak in the equatorial region at about 35 km is confirmed and strong OClO SCD in both polar regions are observed (more than 1016 cm−2 in the Antarctic region and slightly less in the Arctic region), a sign of chlorine activation. The second climatology is a monthly time series. It clearly shows the chlorine activation of the lower stratosphere during winter. Moreover the equatorial OClO SCD peak is observed during all years without any significant variations. This very promising method, applied on GOMOS measurements, allowed us to build the first nighttime climatology of OClO using limb-viewing instruments.

Summary
OClO slant column densities derived from GOMOS averaged transmittance measurements

Excerpt
Bertaux, J. L., Kyrölä, E., Fussen, D., Hauchecorne, A., Dalaudier, F., Sofieva, V., Tamminen, J., Vanhellemont, F., Fanton d'Andon, O., Barrot, G., Mangin, A., Blanot, L., Lebrun, J. C., Pérot, K., Fehr, T., Saavedra, L., Leppelmeier, G. W., and Fraisse, R.: Global ozone monitoring by occultation of stars: an overview of GOMOS measurements on ENVISAT, Atmos. Chem. Phys., 10, 12091–12148, doi:10.5194/acp-10-12091-2010, 2010.; Berthet, G., Renard, J. B., Catoire, V., Chartier, M., Robert, C., Huret, N., Coquelet, F., Bourgeois, Q., Riviere, E. D., Barret, B., Lefevre, F., and Hauchecorne, A.: Remote sensing measurements in the polar vortex: comparison to in situ observations and implications for the simultaneous retrievals and analysis of the NO2 and OClO species, J. Geophys. Res., 112, D21310, doi:10.1029/2007JD008699, 2007.; Damiani, A., Funke, B., Marsh, D. R., López-Puertas, M., Santee, M. L., Froidevaux, L., Wang, S., Jackman, C. H., von Clarmann, T., Gardini, A., Cordero, R. R., and Storini, M.: Impact of January 2005 solar proton events on chlorine species, Atmos. Chem. Phys., 12, 4159–4179, doi:10.5194/acp-12-4159-2012, 2012.; Farman, J. C., Gardiner, G., and Shanklin, J. D.: Large losses of total ozone in antartica reveal seasonal ClO$_x/$NOx interaction, Nature, 315, 207–210, 1985.; Fussen, D., Vanhellemont, F., Dodion, J., Bingen, C., Mateshvili, N., Daerden, F., Fonteyn, D., Errera, Q., Chabrillat, S., Kyrölä, E., Tamminen, J., Sofieva, V., Hauchecorne, A., Dalaudier, F., Bertaux, J.-L., Renard, J.-B., Fraisse, R., d'Andon, O. F., Barrot, G., Guirlet, M., Mangin, A., Fehr, T., Snoeij, P., and Saavedra, L.: A global OClO stratospheric layer discovered in GOMOS stellar occultation measurements, Geophys. Res. Lett., 33, L13815, doi:10.1029/2006GL026406, 2006.; 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, doi:10.5194/acp-6-1879-2006, 2006.; Kühl, S., Pukite, J., Deutschmann, T., Platt, U., and Wagner, T.: SCIAMACHY limb measurements of NO2, BrO and OClO. Retrieval of vertical profiles: Algorithm, first results, sensitivity and comparison studies, Adv. Space Res., 42, 1747–1764, 2008.; Kuttippurath, J., Godin-Beekmann, S., Lefèvre, F., Nikulin, G., Santee, M. L., and Froidevaux, L.: Record-breaking ozone loss in the Arctic winter 2010/2011: comparison with 1996/1997, Atmos. Chem. Phys., 12, 7073–7085, doi:10.5194/acp-12-7073-2012, 2012.; Kyrölä, E., Tamminen, J., Sofieva, V., Bertaux, J. L., Hauchecorne, A., Dalaudier, F., Fussen, D., Vanhellemont, F., Fanton d'Andon, O., Barrot, G., Guirlet, M., Mangin, A., Blanot, L., Fehr, T., Saavedra de Miguel, L., and Fraisse, R.: Retrieval of atmospheric parameters from GOMOS data, Atmos. Chem. Phys., 10, 11881–11903, doi:10.5194/acp-10-11881-2010, 2010b.; Miller, H. L. J., Sanders, R. W., and Solomon, S.: Observations and interpretation of column OClO seasonal cycles at two polar sites, J. Geophys. Res., 104, 18769–18783, 1999.; Oetjen, H., Wittrock, F., Richter, A., Chipperfield, M. P., Medeke, T., Sheode, N., Sinnhuber, B.-M., Sinnhuber, M., and Burrows, J. P.: Evaluation of stratospheric chlorine chemistry for the Arctic spring 2005 using modelled and measured OClO column densities, Atmos. Chem. Phys., 11, 689–703,

 

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