Cumulus cloud radiative properties and the characteristics of satellite radiance wavenumber spectra

Visible and infrared wavenumber spectra were examined for two AVHRR images (256 × 256 pixels; 1.1 km resolution) of single layer, shallow-cumuliform clouds from off the east coast of North America. For each image, both spectra are almost identical in form for scales between 2 and 256 km. For scales greater than ∼5 km, spectral slopes can vary widely between cloud types, but for smaller scales they follow ∼k−3 in constancy with previous results. …