Solar spectral absorption by marine stratus clouds: Measurements and modeling

摘要: [1] The measurement of cloud absorption from aircraft has been a controversial subject largely because broadband measurements provide little insight into the physical mechanisms underlying absorption. To partition and quantify various absorption, spectrally resolved are required. Measurements solar spectral (400–2150 nm) airborne spectroradiometers presented two cases extensive tropical marine stratus fields. Radiative transfer modeling was used to retrieve optical thickness droplet effective radius best fit with measured albedo. These values were estimate absorptance. For higher case, measurement-model agreement in absorptance across spectrum is better than 0.05 substantially (within 0.01) at visible wavelengths unaffected by an optically thinner more heterogeneous field, differences higher, up 0.07 near infrared. The standard deviations spectra show that integrated absorbed irradiances, usually radiometers, strongly affected variations water vapor amount. illustrate dependence radiatively important gases (e.g., vapor), liquid water, absorbing aerosol particles. A novel sampling strategy, based on single measurements, demonstrated, as value partitioning including possible effects aerosols embedded clouds.