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Intercomparison of Satellite Retrieved Aerosol Optical Depth Over Ocean (Sep 1997 - Dec 2000)

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25 diapositives · 395 Views · Sep 05, 2014

This study compares aerosol optical depth (AOD) retrieved from ten satellite instruments over oceanic regions during three different time periods, primarily focusing on a 40-month span from September 1997 to December 2000. The satellite data examined include AVHRR, SeaWiFS, TOMS, MODIS, and MISR. Monthly mean AOD values were calculated for various ocean regions, with a notable focus on comparisons against AERONET data. Results indicate that while satellite retrievals correlate well with AERONET data, significant uncertainties exist, especially in coastal areas and the Southern Hemisphere at high latitudes.

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  1. Intercomparison of satellite retrieved aerosol optical depth over ocean G. Myhre, F. Stordal, M. Johnsrud, A. Ignatov, M.I. Mishchenko, I.V. Geogdzhayev, D. Tanré, J.L. Deuzé, P. Goloub, T. Nakajima, A. Higurashi, O. Torres, B.N. Holben, N.G. Loeb, S. Bailey, G. Feldman, T. Holzer-Popp, M. Schroedter MODIS and MISR data have been downloaded from their web sites. We acknowledge the effort of the two teams • Compared 10 satellite retrievals over 3 time periods • Main focus on a 40 months period from September 1997 to December 2000. • Comparisons made for monthly mean data • Two AVHRR retrievals, POLDER, OCTS, TOMS, SeaWiFS, VIRS, GOME/ATSR-2, MODIS, MISR

  2. 8-months period, Nov 96 – Jun 97

  3. Where are the uncertainties largest? Myhre et al., JAS, 2003, in press

  4. 40 months period Averaged AOD (550 nm) over ocean for the period Sep 97-Dec 00. Maximum AOD is 0.72, 1.00, 0.28, and 1.68, respectively for AVHRR-1, AVHRR-2, SeaWiFS, and TOMS.

  5. Monthly mean AOD during the 40 months period

  6. AOD for 11 oceanic regions

  7. Spatial correlation between various satellite retrievals for 11 oceanic regions

  8. Comparison with AERONET data • Alot of data available • Generally satellite retrievals compare well with AERONET data • No obvious retrieval perform better/worse compared to the AERONET data

  9. SCATTER PLOT, SATELLITE RETRIEVALS VS AERONET

  10. AOD comparison in events of high AOD or aerosol campaigns

  11. Global land and ocean Global land Global ocean

  12. Monthly mean AOD over ocean for 9 near coastal regions

  13. Modis 2001 annual mean AOD Modelled 1996 annual mean AOD

  14. Summary • Compared 10 satellite retrievals over ocean during 3 time periods • Over ocean the satellite retrievals compare best in coastal regions • Generally at least a factor of two differences • Largest uncertainties over ocean in the southern hemisphere at high latitudes • Some retrievals has upper limits in AOD, which clearly leads to underestimation of AOD for some location and time periods • Compared to AERONET observations the satellite retrievals generally underestimate large AOD, no large difference in size, and region

  15. AOD OVER OCEAN, ZONAL MEAN AVHRR-1(2g), AVHRR-2, TOMS and SeaWiFS for Sep 97-Dec 00, VIRS for Jan-Aug 98, MODIS for Mar-Dec 00.

  16. SCATTER PLOT OF AOD, LAND AND OCEAN STATIONS MISR MODIS