Aerosol retrievals from METEOSAT-8 - CM SAF

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SAF on Climate Monitoring Visiting Scientists Report Doc. No: 1.0 Issue : 1.0 Date : 4 October 2006 the compositing time and the compositing period itself T comp - Accurate radiative transfer with multiple scattering, including sphericity of the atmosphere for large angles. Then a lot of work could be done to improve this one-channel algorithm. Several questions have to be answered first: - To what extent can the aerosol properties be considered stable at a particular location within a couple of hours or an entire day in order to exploit the multi-angular information of SEVIRI measurement and thus to better constrain the aerosol model - To what extend can the HRV channel help improve the spatial resolution and the spectral dependence of the aerosol scattering properties toward the blue The preliminary results of this study demonstrated the potential of SEVIRI to retrieve aerosol properties. The comparisons with AERONET data are very promising and showed that SEVIRI could be used to derived AOT values. In general the variability is well reproduced, although some stations show biases between MSG and AERONET. There are several suggestions for improving the presented aerosol retrieval algorithm, and develop a mature algorithm for accurate monitoring of the diurnal variability (15 minutes time sampling) in aerosol load at a spatial resolution of around 5 km. This would be a unique data set that cannot be derived from polar platforms. MSG/SEVIRI aerosol retrievals are possible both over dark targets (ocean and forest) and brighter targets over land (limitations must be taken into account for very bright target such as desert), because surface reflectances can be determined with a high accuracy. The latter is an improvement as compared to retrievals from polar orbiters such as MODIS. References Borde, R., Ramon, D., Schmechtig, C., and Santer, R., “Extension of the DDV concept to retrieve aerosol properties over land from the Modular Optoelectronic Scanner sensor”, International Journal of Remote Sensing, 24, 1439-1467, 2003. Hess, M., Koepke, P., Schult, I. Optical properties of aerosols and clouds: the software package OPAC. Bull. Amer. Meteor. Soc. 79, 831-844, 1998. - 34 -
SAF on Climate Monitoring Visiting Scientists Report Doc. No: 1.0 Issue : 1.0 Date : 4 October 2006 Holzer-Popp, T., M. Schroedter, and G., Gesell, “Retrieving aerosol optical depth and type in the boundary layer over land and ocean from simultaneous GOME spectrometer and ATSR-2 radiometer measurements, 1, Method description”, J. Geophys. Res., 107, D24, 2002. Kaufman and Tanre, 1998: Algorithm for Remote Sensing of Tropospheric Aerosol from MODIS. Products: MOD04_L2, MOD08_D3, MOD08_E3, MOD08_M3. ATBD Reference Number: ATBD-MOD-02. (see http://modis-atmos.gsfc.nasa.gov/MOD04_L2/atbd.html) Knapp, K. R., R. Frouin, S. Kondragunta and A. Prados, “Toward aerosol optical depth retrievals over land from GOES visible radiances: determining surface reflectance”, Int. J. Remote Sensing, 2005, in press. (doi: 10.1080/01431160500099329) Knapp, K. R., T. H. Vonder Haar, and Y. J. Kaufman, “Aerosol optical depth retrieval from GOES-8: Uncertainty study and retrieval validation over South America”, J. Geophys. Res., 107 (D7), 4055, 2002, (doi:10.1029/2001JD000505). Koepke, P., Hess, M., Schult, I., Shettle, E. Global aerosol data set. Technical Report 243, MPI Meteorologie, Hamburg, 1997. King, M. D., Y. J. Kaufman, D. Tanré and T. Nakajima, “Remote sensing of tropospheric aerosols from space: past, present, and future”, Bulletin of the American Meteorological Society, Vol. 80, No. 11, 1999. Martonchik, J.V., Diner, D.J., Kahn, R.A., Ackerman, T.P., Verstraete, M.M., Pinty, B., and Gordon, H.R., “Techniques for the retrieval of aerosol properties over land and ocean using multiangle imaging”. IEEE Transactions on Geoscience and Remote Sensing, 36, 1212-1227, 1998. Pinty, B., F. Roveda, M. M. Verstraete, N. Gobron, Y. Govaerts, J. V. Martonchik, D. J. Diner and R. A. Kahn, “Surface albedo retrieval from Meteosat, 1. theory”, JGR, Vol. 105, D14, 18,099- 18112, 2000. Ramon, D., and R. Santer, “Operational remote sensing of aerosols over land to account for directional effects”. Applied Optics, 40, 3060-3075, 2001. - 35 -
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