Atmospheric Chemistry and Physics Discussions
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8
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2008
10.5194/acpd-8-5183-2008
http://www.atmos-chem-phys-discuss.net/8/5183/2008/
http://www.atmos-chem-phys-discuss.net/8/5183/2008/acpd-8-5183-2008.html
http://www.atmos-chem-phys-discuss.net/8/5183/2008/acpd-8-5183-2008.pdf
5183
5233
2008-03-11
Error analysis for CO and CH<sub>4</sub> total column retrievals from SCIAMACHY 2.3 μm spectra
A. M. S. Gloudemans
a.gloudemans@sron.nl
H. Schrijver
O. P. Hasekamp
I. Aben
SRON Netherlands Institute for Space Research, Utrecht, The Netherlands
A detailed sensitivity analysis of the Iterative Maximum Likelihood
Method (IMLM) algorithm and its application
to the SCIAMACHY 2.3 μm spectra is presented.
The sensitivity analysis includes a detailed assessment of the impact of
aerosols in the 2.3 μm range.
Results show that near strong aerosol sources mineral
dust and biomass aerosols can have an effect of ~7–10%
on the CH<sub>4</sub> total columns retrieved from this wavelength range. Similar
but somewhat larger effects are found for CO, but due to the
larger variability of CO
these errors are less important. Away from strong sources much
smaller effects of a few percent are found.
Spectroscopic uncertainties are mostly negligible except for
uncertainties in the CH<sub>4</sub> intrinsic line intensities, which can
be important.
Application of the IMLM algorithm
to the SCIAMACHY 2.3 μm spectra shows that the
quality of the retrieved CO and CH<sub>4</sub> total columns is good, except
for a bias for large instrument-noise errors which is partly due to
remaining calibration issues.
Polarization sensitivity of the SCIAMACHY instrument has a negligible effect
on the retrieved CO and CH<sub>4</sub> total columns.
The H<sub>2</sub>O total
columns, which have to be retrieved simultaneously with CO and CH<sub>4</sub>
due to overlapping absorption lines, agree
well with H<sub>2</sub>O total columns from ECMWF data.
This ensures that the fit to the
H<sub>2</sub>O absorptions is of sufficient quality not to hamper
the retrieved CO and CH<sub>4</sub> total columns from SCIAMACHY spectra.
Aben, I., Hasekamp, O., and Hartmann, W.: Uncertainties in the space-based measurements of CO<sub>2</sub> columns due to scattering in the Earth's atmosphere, J. Quant, Spectrosc. Radiat. Transfer, 104(3), 450–459, 2007
Anderson, G. P., Clough, S. A., Kneizys, F. X., Chetwynd, J. H., and Shettle, E. P.: AFGL Atmospheric Constituent Profiles (0–120 km), AFGL-TR-86-0110, Air Force Geophys. Lab., Hanscom AFB, Mass., 1986.
Bertschi I. T. and Jaffe, D. A.: Long-range transport of ozone, carbon monoxide, and aerosols to the NE Pacific troposphere during the summer of 2003: Observations of smoke plumes from Asian boreal fires, J. Geophys. Res., 110, D05303, doi:10.1029/2004JD005135, 2005.
Bovensmann, H., Burrows, J. P., Buchwitz, M., Frerick, J., Noël, S., Rozanov, V. V., Chance, K. V., and Goede, A.: SCIAMACHY: Mission Objectives and Measurement Modes, J. Atmos. Sci., 56, 127–150, 1999
Buchwitz, M., Rozanov, V. V., and Burrows J. P.: A near-infrared optimized DOAS method for the fast global retrieval of atmospheric CH<sub>4</sub>, CO, CO<sub>2</sub>, H<sub>2</sub>O, and N<sub>2</sub>O total column amounts from SCIAMACHY Envisat-1 nadir radiances, J. Geophys. Res., 105, 15 231–15 245, 2000.
Buchwitz, M. and Burrows, J. P.: Retrieval of CH<sub>4</sub>, CO, and CO<sub>2</sub> total column amounts from SCIAMACHY near-infrared nadir spectra: Retrieval algorithm and first results, in: Remote Sensing of Clouds and the Atmosphere VIII, edited by: Schäfer, K. P., Comèron, A., Carleer, M. R., and Picard R. H., Proceedings of SPIE, 5235, 375–388, 2004.
Buchwitz, M., de Beek, R., Bramstedt, K., et al.: Global carbon monoxide as retrieved from SCIAMACHY by WFM-DOAS, Atmos. Chem. Phys., 4, 1945–1960, 2004a.
de Graaf, M., Stammes, P., and Aben, E. A. A.: Analysis of reflectance spectra of UV-absorbing aerosol scenes measured by SCIAMACHY, J. Geophys. Res., 112, D02206, doi:10.1029/2006JD007249, 2007.
De Laat, A. T. J., Gloudemans, A. M. S., Schrijver, H., van den Broek, M. M. P., Meirink, J. F., Aben, I., and Krol, M.: Quantitative analysis of SCIAMACHY carbon monoxide total column measurements, Geophys. Res. Lett., 33, L07807, doi:10.1029/2005GL025530, 2006.
De Laat, A. T. J., Gloudemans, A. M. S., Aben, I., Krol, M., Meirink, J. F., van der Werf, G. R., Schrijver, H.: SCIAMACHY carbon monoxide total columns: statistical evaluation and comparison with CTM results, J. Geophys. Res., 112, D12310, doi:10.1029/2006JD008256, 2007.
de Reus, M., Dentener, F. J., Thomas, A., Borrmann, S., Ström, J., and Lelieveld, J.: Airborne observations of dust aerosol over the North Atlantic Ocean during ACE 2: Indications for heterogeneous ozone destruction, J. Geophys. Res., 105, 15263–15275, 2000.
Dils, B., De Mazière, M., Müller, J. F., et al.: Comparisons between SCIAMACHY and ground-based FTIR data for total columns of CO, CH<sub>4</sub>, CO<sub>2</sub> and N<sub>2</sub>O, Atmos. Chem. Phys., 6, 1953–1976, 2006.
Edwards, D. P., Emmons, L. K., Hauglustaine, D. A., et al.: Observations of Carbon Monoxide and Aerosol From the Terra Satellite: Northern Hemisphere Variability, J. Geophys. Res., 109, D24202, doi:10.1029/2004JD0047272004, 2004.
Edwards D. P., Emmons, L. K., Gille, J. C., et al.: Satellite-observed pollution from Southern Hemisphere biomass burning, J. Geophys. Res., 111, D14312, doi:10.1029/2005JD006655, 2006.
Flentje, H., Dörnbrack, A., Fix, A., Ehret, G., and Hólm, E.: Evaluation of ECMWF water vapour analyses by airborne differential absorption lidar measurements: a case study between Brasil and Europe, Atmos. Chem. Phys., 7, 5033–5042, 2007.
Frankenberg, C., Platt, U., and Wagner, T.: Iterative maximum a posteriori (IMAP)-DOAS for retrieval of strongly absorbing trace gases: Model studies for CH<sub>4</sub> and CO<sub>2</sub> retrieval from near infrared spectra of SCIAMACHY onboard ENVISAT, Atmos. Chem. Phys., 5, 9–22, 2005.
Frankenberg, C., Meirink, J. F., Bergamaschi, P., Goede, A. P. H., Heimann, M., Körner, S., Platt, U., van Weele, M., and Wagner, T.: Satellite chartography of atmospheric methane from SCIAMACHY on board ENVISAT: Analysis of the years 2003 and 2004, J. Geophys. Res., 111, D07303, doi:10.1029/2005JD006235, 2006.
Gloudemans, A. M. S., Schrijver, H., Kleipool, Q., et al.: The impact of SCIAMACHY near-infrared instrument calibration on CH<sub>4</sub> and CO total columns, Atmos. Chem. Phys., 5, 2369–2383, 2005.
Gloudemans, A. M. S., Krol, M. C., Meirink, J. F., de Laat, A. T. J., van der Werf, G. R., Schrijver, H., van den Broek, M. M. P., and Aben, I.: Evidence for long-range transport of Carbon Monoxide in the Southern Hemisphere from SCIAMACHY observations, Geophys. Res. Lett., 33, L16807, doi:10.1029/2006GL026804, 2006.
Hasekamp, O. P. and Landgraf, J.: A linearized vector radiative transfer model for atmospheric trace gas retrieval, J. Quant, Spectrosc. Radiat. Transfer, 75, 221–238, 2002.
Hasekamp, O. P. and Landgraf, J.: Linearization of vector radiative transfer with respect to aerosol properties and its use in remote sensing, J. Geophys. Res., 110, D04203, doi:10.1029/2004JD005260, 2005.
Haywood, J., Francis, P., Osborne, S., Glew, M., Loeb, N., Highwood, E., Tanre, D., Myhre, G., Formenti, P., and Hirst, E.: Radiative properties and direct radiative effect of Saharan dust measured by the C-130 aircraft during SHADE: 1. Solar spectrum, J. Geophys. Res., 108, doi:10.1029/2002JD002687, 2003.
Houweling, S. , Hartmann, W., Aben, I., Schrijver, H., Skidmore, J., et al.: Evidence of systematic errors in SCIAMACHY-observed CO<sub>2</sub> due to aerosols, Atmos. Chem. Phys., 5, 3003–3013, 2005
Jongma, R. T., Gloudemans, A. M. S., Hoogeveen, R. W. M., Aben, I., de Vries, J., Escudero-Sanz, I., van den Oord, G. H. J., and Levelt, P. F.: Sensitivity analysis of a new SWIR-channel measuring tropospheric CH<sub>4</sub> and CO from space, in Imaging Spectrometry XI, edited by: Shen, S. S. and Lewis, P. E., Proceedings of SPIE, 6302, 630214, 2006.
Kahn, R. A., Gaitley, B. J., Martonchik, J. V., Diner, D. J., Crean, K. A., and Holben, B.: Multiangle Imaging Spectroradiometer (MISR) global aerosol optical depth validation based on 2 years of coincident Aerosol Robotic Network (AERONET) observations, J. Geophys. Res., 110, doi:10.1029/2004JD004 706, 2005.
Karyampudi, V. M., Palm, S. P., Reagan, J. A., Fang, H., Grant, W. B., Hoff, R. M., Moulin, C., Pierce, H. F., Torres, O., Browell, E. V., and Harvey Melfi, S.: Validation of the Saharan dust plume conceptual model using lidar, Meteosat, and ECMWF data, Bull. Am. Meteorol. Soc., 80, 1045–1075, 1999.
Kleipool, Q.: SCIAMACHY SODAP: Algorithm specification for dark signal determination, Tech. Report SRON-SCIA-PhE-RP-009, SRON, 2003a.
Kleipool, Q.: SCIAMACHY: Recalculation of OPTEC5 non-linearity, Tech. Report SRON-SCIA-PhE-RP-013, SRON, 2003b.
Kleipool, Q.: SCIAMACHY: Orbital variation of dark signal, Tech. Report SRON-SCIA-PhE-RP-18, SRON, 2004a.
Kleipool, Q.: SCIAMACHY: Evolution of dead and bad pixel mask, Tech. Report SRON-SCIA-PhE-RP-21, SRON, 2004b.
Kleipool, Q. L., Jongma, R., Gloudemans, A. M. S., et al.: In-flight proton-induced radiation damage to SCIAMACHY's extended-wavelength InGaAs near-infrared detectors, Infrared Phys. Technol., 50, 30–37, 2007
Krijger, J. M., Aben, I., and Schrijver, H.: Distinction between clouds and ice/snow covered surfaces in the identification of cloud-free observations using SCIAMACHY PMDs, Atmos. Chem. Phys., 5, 2729–2738, 2005.
Lichtenberg, G. F., and The SCIAMACHY Calibration Team: SCIAMACHY Level1 data: Calibration concept and in-flight calibration, Atmos. Chem. Phys., 6, 5347–5367, 2006.
Rondeaux, G., and Herman, M.: Polarization of light reflected by crop canopies, Remote Sens. Environ. 38, 63–75, 1991.
Rothman, L. S., Jacquemart, D., Barbe, A., et al.: The HITRAN 2004 molecular spectroscopic database, JQSRT, 96, 139–204, 2005.
Schrijver, H.: Retrieval of carbon monoxide, methane and nitrous oxide from SCIAMACHY measurements, in Proc. ESAMS, European Symposium on Atmospheric Measurements from Space, ESA WPP-161 1, ESTEC, Noordwijk, The Netherlands, 285–294, 1999.
Schrijver, H, Gloudemans, A. M. S., Houweling, S., and Aben, I.: Comparison of two years of methane column retrievals from SCIAMACHY observations in the 1.65 and 2.33 micrometer windows, in Proc. Atmospheric Science Conference, ESA-SP 628, 8–12~May~2006, Frascati, Italy, p.23.1, 2006.
Schrijver, H.: Validation of SCIAMACHY channel 8 calibrations in the level 1B validation data set, in Proc. of the Third Workshop on the Atmospheric Chemistry Validation of Envisat (ACVE-3), ESA-SP 642, 4–7~December~2006, Frascati, Italy, p., 2007.
Tie X., Madronich, S., Walters, S., Edwards, D. P., Ginoux, P., Mahowald, N., Zhang, R., Lou, C., and Brasseur, C.: Assessment of the global impact of aerosols on tropospheric oxidants, J. Geophys. Res., 110, D03204, doi:10.1029/2004JD005359, 2005.
Torres, O., Decae, R., Veefkind, P., and de Leeuw, G.: OMI aerosol retrieval algorithm, ATBD-OMI-03, 47–69, 2001.