Publication Abstracts

Naud et al. 2005

Naud, C.M., J.P. Muller, E.E. Clothiaux, B.A. Baum, and W.P. Menzel, 2005: Intercomparison of multiple years of MODIS, MISR and radar cloud-top heights. Ann. Geophys., 23, 2415-2424, doi:10.5194/angeo-23-2415-2005.

Radar cloud-top heights were retrieved at both the Chilbolton Facility for Atmospheric and Radio Research, UK (CFARR) and the ARM Southern Great Plain site, USA (SGP), using the millimetre wave cloud radars and identical algorithms. The resulting cloud-top heights were used for comparison with MODIS and MISR retrieved cloud-top heights, from March 2000 to October 2003. Both imaging instruments reside on the NASA Earth Observing system (EOS) Terra platform launched in 1999. MODIS and MISR cloud-top products were from the recent collections (4 and 3, respectively) that cover the entire mission. The cloud characteristics are different at each ground site, with clouds generally residing at higher altitudes at SGP, but with a greater occurrence of broken or multilayered clouds at CFARR. A method is presented to automatically eliminate scenes where clouds are of a broken nature, since it is difficult in these conditions to ensure that ground-based and satellite measurements refer to the same cloud deck. The intercomparison between MODIS and radar cloud-top heights reveals that MODIS cloud-top heights agree with radar within about 1km for mid- and high-level clouds. However, this accuracy is degraded to nearly 3km for low-level clouds. MISR cloud-top heights are found to agree with radar cloud-top heights to within 0.6km, which is in line with theoretical expectations. In single-level cloud situations MODIS and MISR cloud-top heights tend to agree within 1km. This comparison also reveals that the loss of radar sensitivity during 2001 resulted in the CFARR instrument being less accurate for high-level cloud-top height measurements.

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BibTeX Citation

  author={Naud, C. M. and Muller, J. P. and Clothiaux, E. E. and Baum, B. A. and Menzel, W. P.},
  title={Intercomparison of multiple years of MODIS, MISR and radar cloud-top heights},
  journal={Annales Geophysicae},

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RIS Citation

ID  - na00100w
AU  - Naud, C. M.
AU  - Muller, J. P.
AU  - Clothiaux, E. E.
AU  - Baum, B. A.
AU  - Menzel, W. P.
PY  - 2005
TI  - Intercomparison of multiple years of MODIS, MISR and radar cloud-top heights
JA  - Ann. Geophys.
JO  - Annales Geophysicae
VL  - 23
SP  - 2415
EP  - 2424
DO  - 10.5194/angeo-23-2415-2005
ER  -

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