Publication Abstracts

Geogdzhayev et al. 2004

Geogdzhayev, I.V., M.I. Mishchenko, L. Liu, and L. Remer, 2004: Global two-channel AVHRR aerosol climatology: Effects of stratospheric aerosols and preliminary comparisons with MODIS and MISR retrievals. J. Quant. Spectrosc. Radiat. Transfer, 88, 47-59, doi:10.1016/j.jqsrt.2004.03.024.

We present an update on the status of the global climatology of the aerosol column optical thickness and Ångström exponent derived from channel-1 and -2 radiances of the advanced very high resolution radiometer (AVHRR) in the framework of the Global Aerosol Climatology Project (GACP). The latest version of the climatology covers the period from July 1983 to September 2001 and is based on an adjusted value of the diffuse component of the ocean reflectance as derived from extensive comparisons with ship sun-photometer data. We use the updated GACP climatology and stratospheric aerosol and gas experiment (SAGE) data to analyze how stratospheric aerosols from major volcanic eruptions can affect the GACP aerosol product. One possible retrieval strategy based on the AVHRR channel-1 and -2 data alone is to infer both the stratospheric and the tropospheric aerosol optical thickness while assuming fixed microphysical models for both aerosol components. The second approach is to use the SAGE stratospheric aerosol data in order to constrain the AVHRR retrieval algorithm. We demonstrate that the second approach yields a consistent long-term record of the tropospheric aerosol optical thickness and Ångström exponent. Preliminary comparisons of the GACP aerosol product with MODerate resolution Imaging Spectrometer (MODIS) and multiangle imaging spectro-radiometer aerosol retrievals show reasonable agreement, the GACP global monthly optical thickness being lower than the MODIS one by approximately 0.03. Larger differences are observed on a regional scale. Comparisons of the GACP and MODIS Ångström exponent records are less conclusive and require further analysis.

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BibTeX Citation

@article{ge02000x,
  author={Geogdzhayev, I. V. and Mishchenko, M. I. and Liu, L. and Remer, L.},
  title={Global two-channel AVHRR aerosol climatology: Effects of stratospheric aerosols and preliminary comparisons with MODIS and MISR retrievals},
  year={2004},
  journal={J. Quant. Spectrosc. Radiat. Transfer},
  volume={88},
  pages={47--59},
  doi={10.1016/j.jqsrt.2004.03.024},
}

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RIS Citation

TY  - JOUR
ID  - ge02000x
AU  - Geogdzhayev, I. V.
AU  - Mishchenko, M. I.
AU  - Liu, L.
AU  - Remer, L.
PY  - 2004
TI  - Global two-channel AVHRR aerosol climatology: Effects of stratospheric aerosols and preliminary comparisons with MODIS and MISR retrievals
JA  - J. Quant. Spectrosc. Radiat. Transfer
VL  - 88
SP  - 47
EP  - 59
DO  - 10.1016/j.jqsrt.2004.03.024
ER  -

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