Mike Pavolonis (NOAA/NESDIS/STAR)

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Presentation transcript:

Mike Pavolonis (NOAA/NESDIS/STAR) Preliminary Assessment of Eyjafjallajokull Ash Heights Retrieved from SEVIRI and MODIS on April 20, 2010 Mike Pavolonis (NOAA/NESDIS/STAR)

Summary Spaceborne lidar observations from CALIPSO were used to assess the accuracy of the infrared ash height retrievals performed using SEVIRI and MODIS on April 20, 2010 near Iceland. Special thanks to the CALIPSO Team at NASA Langley for providing expedited L1 data. The lidar total attenuated backscatter has a vertical resolution of 60 m, which allows for a high quality depiction of the ash cloud top.

April 20, 2010 04:10 UTC

Expedited CALIOP L1 data courtesy of NASA Langley

8 - 10 km infrared cloud height retrieval off the coast of Iceland agrees well with CALIOP The height of the optically thin ash cloud over Iceland is underestimate by the infrared retrieval (probably due to poor clear sky radiance estimate over land near coastline) Expedited CALIOP L1 data courtesy of NASA Langley

April 20, 2010 13:45 UTC

Are these retrieved heights too low?

Zoom in on this area where CALIPSO had an overpass

Expedited CALIOP L1 data courtesy of NASA Langley

The CALIOP shows that this optically thin ash cloud is mainly located in the boundary layer. The infrared retrievals also indicate a very low ash cloud height. This supports the hypothesis that the ash cloud heights on April 20, 2010 decreased rapidly with time as shown in the SEVIRI loop. Expedited CALIOP L1 data courtesy of NASA Langley

Conclusions The ash heights retrieved using infrared measurements from SEVIRI and MODIS are in good agreement with spaceborne lidar measurements (generally within 1 - 2 km). A more quantitative assessment will be performed when the CALIPSO cloud layers data product is released for these dates.