Differences

This shows you the differences between two versions of the page.

--- aerosol_land [2010/02/17 10:32] – copied page from former website ebaudrez
+++ aerosol_land [2013/10/14 11:06] (current) – removed aipe
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-====== Land ======
-===== Meteosat-8 images =====
-March 2006 12:00 UTC, dust outbreak over the Sahara.
-The desert surface is characterized by very low emissivity at IR8.7μm, we can see it appear darker on the image:
-{{http://gerb.oma.be/aerosol/aerosol_land/figures/200603081200_spp_T3.png|8.7μm brightness temperature}}
-If we make the difference between 8.7μm and 10.8μm we are able to separate the clear-sky regions from the regions with aerosols:
-{{http://gerb.oma.be/aerosol/aerosol_land/figures/200603081200_T3_T5.png|difference image 8.7μm -- 10.8μm}}
-In order to make a reference image with the surface contribution we estimate the surface emissivity from the clear-sky observations:
-{{http://gerb.oma.be/aerosol/aerosol_land/figures/200603081200_emissivity_108.png|10.8μm land surface emissivity}}