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Retrieval and Validation of O3 Measurements from Ground-based Ftir Spectrometer at Equatorial Station: Addis Ababa, Ethiopia : Volume 5, Issue 5 (18/09/2012)

By Takele Kenea, S.

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Book Id: WPLBN0003980173
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File Size: Pages 50
Reproduction Date: 2015

Title: Retrieval and Validation of O3 Measurements from Ground-based Ftir Spectrometer at Equatorial Station: Addis Ababa, Ethiopia : Volume 5, Issue 5 (18/09/2012)  
Author: Takele Kenea, S.
Volume: Vol. 5, Issue 5
Language: English
Subject: Science, Atmospheric, Measurement
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Blumenstock, T., Hase, F., Tsidu, G. M., Kenea, S. T., Clarmann, T. V., & Stiller, G. P. (2012). Retrieval and Validation of O3 Measurements from Ground-based Ftir Spectrometer at Equatorial Station: Addis Ababa, Ethiopia : Volume 5, Issue 5 (18/09/2012). Retrieved from http://worldebooklibrary.com/


Description
Description: Department of Physics, Addis Ababa University, P.O. Box 1176, Addis Ababa, Ethiopia. Since May 2009 high-resolution Fourier transform infrared (FTIR) solar absorption spectra are recorded at Addis Ababa (9.01° N latitude, 38.76° E longitude, 2443 m altitude a.s.l.), Ethiopia. The vertical profiles and total column amounts of ozone (O3) are deduced from the spectra by using the retrieval code PROFFIT (V9.5) and regularly determined instrumental line shape (ILS). A detailed error analysis of the O3 retrieval is performed. Averaging kernels analysis of the target gas shows that the major contribution to the retrieved information always comes from the measurement. We obtained 2.1 degrees of freedom on average for signals in the retrieval of O3 from the observed FTIR spectra. We have compared the FTIR retrieval of ozone Volume Mixing Ratio (VMR) profiles and column amounts with the coincident satellite observations of Microwave Limb Sounding (MLS), Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) and Tropospheric Emission Spectrometer (TES), Ozone Monitoring Instrument (OMI), Atmospheric Infrared Sounding (AIRS) and Global Ozone Monitoring Experiment (GOME-2) instrument. The mean relative differences are generally found below +15% in the altitude range of 27 to 36 km for comparison of VMR profiles made between MLS and MIPAS, whereas comparison with TES has shown below 9.4% relative difference. Furthermore, the mean relative difference is positive above 31 km, suggesting positive bias in the FTIR measurement of O3 VMR with respect to MLS, MIPAS and TES. The overall comparisons of column amounts of satellite measurements with the ground-based FTIR instruments show better agreement exhibiting mean relative differences of ground-based FTIR with respect to MLS and GOME-2 within +0.4% to +4.0% and corresponding standard deviations of 2.2 to 4.3% whereas, in the case of OMI, TES, AIRS, the mean relative differences are from −0.38 to −6.8%. Thus, the retrieved O3 VMR and column amounts from a tropical site, Addis Ababa, is found to exhibit very good agreement with all coincident satellite observations over the 2-yr period.

Summary
Retrieval and validation of O3 measurements from ground-based FTIR spectrometer at equatorial station: Addis Ababa, Ethiopia

Excerpt
Balis, D., Kroon, M., Koukouli, M. E., Brinksma, E. J., Labow, G., Veefkind, J. P., and McPeters, R. D.: Validation of ozone monitoring instrument total ozone column measurements using Brewer and Dobson spectrophotometer ground-based observations, J. Geophys. Res., 112, D24S46, doi:10.1029/2007JD008796, 2007a.; Balis, D., Lambert, J. C., Van Roozendael, M., Spurr, R., Loyola, D., Livschitz, Y., Valks, P., Amiridis, V., Gerard, P., Granville, J., and Zehner, C.: Ten years of GOME/ERS2 total ozone data the new GOME data processor (GDP) version 4.2: Ground-based validation and comparisons with TOMS V7/V8, J. Geophys. Res., 112, D07307, doi:10.1029/2005JD006376, 2007b.; Balis, D., Koukouli, M., Loyola, D., Valks, P., and Hao, N.: Second validation report of GOME-2 total ozone products (OTO/O3, NTO/O3) processed with GDP4.2, Report of the Satellite Application Facility on Ozone and Atmospheric Chemistry Monitoring (O3M-SAF), SAF/O3M/AUTH/GOME-2VAL/RP/02, 2008.; Barret, B., De Maziére, M., and Demoulin, P.: Retrieval and characterization of ozone profiles from solar infrared spectra at the Jungfraujoch: J. Geophys. Res., 107, 4788, doi:10.1029/2001JD001298, 2002.; Barret, B., De Maziére, M., and Demoulin, P.: Correction to Retrieval and characterization of ozone profiles from solar infrared spectra at the Jungfraujoch, J. Geophys. Res., 108, 4372, doi:10.1029/2003JD003809, 2003.; Beer, R., Glavich, T., and Rider, D.: Tropospheric emission spectrometer for the earth observing systems Aura satellite, Appl. Optics, 40, 2356–2367, 2001.; Bowman, K. W., Worden, J., Steck, T., Worden, H. M., Clough, S., and Rodgers, C.: Capturing time and vertical variability of tropospheric ozone: a study using TES nadir retrievals, J. Geophys. Res., 107, 4723, doi:10.1029/2002JD002150, 2002.; Bowman, K. W., Rodgers, C. D., Sund-Kulawik, S., Worden, J., Sarkissian, E., Osterman, G., Steck, T., Luo, M., Eldering, A., Shephard, M. W., Worden, H., Clough, S. A., Brown, P. D., Rinsland, C. P., Lampel, M., Gunson, M., and Beer, R.: Tropospheric emission spectrometer: retrieval method and error analysis, IEEE T. Geosci. Remote, 44, 1295–1307, 2006.; Chauhan, S., Höpfner, M., Stiller, G. P., von Clarmann, T., Funke, B., Glatthor, N., Grabowski, U., Linden, A., Kellmann, S., Milz, M., Steck, T., Fischer, H., Froidevaux, L., Lambert, A., Santee, M. L., Schwartz, M., Read, W. G., and Livesey, N. J.: MIPAS reduced spectral resolution UTLS-1 mode measurements of temperature, O3, HNO3, N2O, H2O and relative humidity over ice: retrievals and comparison to MLS, Atmos. Meas. Tech., 2, 337–353, doi:10.5194/amt-2-337-2009, 2009.; Clough, S. A., Worden, J. R., Brown, P. D., Shephard, M. W., Rinsland, C. P., and Beer, R.: Retrieval of tropospheric ozone from simulations of nadi

 

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