Cloud-vegetation interaction: Use of Normalized Difference Cloud Index for estimation of cloud optical thickness

Details Cloud-vegetation interaction: Use of Normalized Difference Cloud Index for estimation of cloud optical thickness Cloud-vegetation interaction: Use of Normalized Difference Cloud Index for estimation of cloud optical thickness

Jun 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.1695m&link_type=abstract

Geophysical Research Letters, Volume 27, Issue 12, p. 1695-1698

Physics

Geophysics

17

Mathematical Geophysics: Fractals And Multifractals, Meteorology And Atmospheric Dynamics: Land/Atmosphere Interactions, Meteorology And Atmospheric Dynamics: Radiative Processes, Meteorology And Atmospheric Dynamics: Remote Sensing

Scientific paper

A new technique to retrieve cloud optical depth for broken clouds above green vegetation using ground-based zenith radiance measurements is developed. By analogy with the Normalized Difference Vegetation Index (NDVI), the Normalized Difference Cloud Index (NDCI) is defined as a ratio between the difference and the sum of two zenith radiances measured for two narrow spectral bands in the visible and near-IR regions. The very different spectra behavior of cloud liquid water drops and green vegetation is the key physics behind the NDCI. It provides extra tools to remove the radiative effects of the 3D cloud structure. Numerical calculations based on fractal clouds and real measurements of NDCI and cloud liquid water path confirm the improvements.

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