Aerosol retrievals from METEOSAT-8 - CM SAF

SAF on Climate Monitoring Visiting Scientists Report Doc. No: 1.0
Issue : 1.0
Date : 4 October 2006
1 Contents
1 CONTENTS ..........................................................................................................................................2
2 ABSTRACT...........................................................................................................................................3
3 INTRODUCTION ................................................................................................................................3
4 USER REQUIREMENTS....................................................................................................................5
4.1 NEEDS FROM CLIMATE RESEARCHES .......................................................................................................5
4.2 NEEDS FROM SAFS..................................................................................................................................5
4.2.1 CM-SAF ............................................................................................................................................5
4.2.2 O3M SAF...........................................................................................................................................6
4.2.3 LAND-SAF ........................................................................................................................................6
4.2.4 O&SI SAF .........................................................................................................................................7
4.3 COOPERATION WITH OTHER SAFS...........................................................................................................7
5 OVERVIEW OF EXISTING AEROSOL RETRIEVAL ALGORITHMS .....................................9
5.1 BACKGROUND .........................................................................................................................................9
5.1.1 Algorithms using angular information ............................................................................................10
5.1.2 Algorithms using spectral indices ...................................................................................................10
5.1.3 GOES ..............................................................................................................................................13
5.1.4 MSG/SEVIRI ...................................................................................................................................15
6 MSG/SEVIRI METHODOLOGY.....................................................................................................17
6.1.1 Introduction.....................................................................................................................................17
6.1.2 Method description..........................................................................................................................17
6.1.3 Reference Surface Reflectance Map................................................................................................18
Cloud Masking.................................................................................................. 18
Rayleigh correction........................................................................................... 18
Surface contribution.......................................................................................... 18
6.1.4 MSG/SEVIRI aerosol optical thickness retrieval algorithm............................................................23
6.1.5 Results and Comparison with AERONET and MODIS ...................................................................27
6.1.6 Assumptions we made to accelerate development of the algorithm and calculations.....................31
7 CONCLUSIONS AND PERSPECTIVES.........................................................................................32
REFERENCES ....................................................................................................................................................34
- 2 -