FIRE IMPACT ON SURFACE ALBEDO

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Presentation transcript:

FIRE IMPACT ON SURFACE ALBEDO SEASONAL CYCLE Yves Govaerts

METEOSAT INSTRUMENT CHARACTERISTICS Channels Visible (VIS) : 0.4 - 1.0 m Water Vapour : 5.7 - 7.1 m Infrared : 10.5 - 12.5 m 2 VIS detectors Image repeat cycle : 30 min

METEOSAT SURFACE ALBEDO Surface albedo definition Directional Hemispherical Reflectance (DHR) BRF: Bidirectional Reflectance Factor Space borne sensors sample BRFs ! Satellite observation

The METEOSAT measurements Absorbing atmosphere Slot n Slot n+1 Slot n+2 Slot n+3 Slot n+ Sensor Scattering atmosphere Anisotropic surface

METEOSAT as a Virtual Multi-angle sensor Reciprocity principle Assumptions Atmosphere is composed of one absorbing gas layer and one scattering layer US62 atmospheric profile Continental aerosol type Atmospheric and surface scattering properties are constant along the day Surface scattering properties can be represented by the RPV BRF model Sensor Sensor Sensor Sensor Slot n+3 Slot n+2 Slot n+1 Slot n+ Slot n Absorbing atmosphere Parameters Model : ozone (TOMS) Total column water vapour (ECMWF) Scattering atmosphere Retrieved : Equivalent aerosol optical thickness (1) surface anisotropy (3) One final product is generated every 10 days in order to minimise the cloud effects. Anisotropic surface

METEOSAT SURFACE ALBEDO PROCESSED AREA(S)

APPLICATIONS 1996 Early Januray Early March Early April 0.0 0.3 0.6 Pinty, B., et al. (2000) Surface albedo retrieval from Meteosat: Part 2: Applications, Journal of Geophysical Research, 105, 18113-18134.

Monsoon-induced cycle of surface albedo APPLICATIONS SURFACE ALBEDO SEASONAL DYNAMICS Monsoon-induced cycle of surface albedo Surface albedo change in the Meteosat VIS band as a function of the vegetation amount over different soil types. Pinty, B.et al. (2000) Do Human-induced Fires Affect the Earth Surface reflectance at Continental Scales?, EOS Transactions of the AGU, 81, 381-389.

SURFACE ALBEDO CHANGE MECHANISM Dry season Dry season DAYS OF 1996

SURFACE ALBEDO CHANGE MECHANISM Decrease Increase Change from November to January Change from January to April Human perturbed cycle Active fire for December 1996 Pinty, B., Verstraete, M.M., Gobron, N., Govaerts, Y., and Roveda, F. (2000) Do Human-induced Fires Affect the Earth Surface reflectance at Continental Scales?, EOS transactions of the AGU, 81, 381-389.

FIRE IMPACT ON SURFACE ALBEDO North Hemisphere Fire-induced perturbation Dry season Dry season Vegetation re-growth DAYS OF 1996

FIRE IMPACT ON SURFACE ALBEDO North Hemisphere Fire-induced perturbation Dry season Dry season Vegetation re-growth DAYS OF 1996

FIRE IMPACT IDENTIFICATION The probability of a fire-induced surface albedo perturbation is estimated with a combination of 3 tests Low albedo values resulting from a decrease 3 Low albedo values High albedo 1 Probability of dark (burnt) surface 2 DAYS OF 1996

FIRE IMPACT IDENTIFICATION Probability of fire-induced surface albedo perturbation South Hemisphere North Hemisphere

FIRE IMPACT IDENTIFICATION Probability of fire-induced surface albedo perturbation South Hemisphere North Hemisphere

FIRE IMPACT EVALUATION : EXPRESSO Number of active fires detected over the EXPRESSO area in November 1996 in each corresponding Meteosat pixel.

FIRE IMPACT EVALUATION : DHR(30) Meteosat Surface Albedo over the EXPRESSO area mid November 1996 Active fires detected with AVHRR

FIRE IMPACT EVALUATION Probability of fire-induced surface albedo perturbation over the EXPRESSO area November 1996

FIRE IMPACT EVALUATION Burned area map based on AVHRR data over the EXPRESSO region in November 1996 Active fires detected with AVHRR WHEN?

FIRE IMPACT EVALUATION Comparison with the AVHRR-based burned area map

FIRE IMPACT EVALUATION Correlation with the number of active fires detected with AVHRR Percentage of burned pixel (AVHRR) Probability of fire-induced perturbation

Probability of fire-induced surface albedo perturbation over the EXPRESSO area

1996 Prototype Unprocessed pixels due to clouds

2000

2001