Thin cirrus clouds - Seasonal distribution over oceans deduced from Nimbus-4 IRIS

摘要: Abstract Spectral differences in the extinction between 10.8 and 12.6 μm bands of infrared window region, due to optically thin clouds, are observed measurements made by a broad-band aircraft radiometer. Similar spectral properties also revealed high-resolution inter-ferometer spectrometer (IRIS) aboard Nimbus-4 satellite, which had field view ∼ 95 km. These observations show that cloud particles at is appreciably larger than μm. Both water or ice clouds can account for such difference provided smaller wavelength radiation. This effect demonstrated with help multiple scattering radiative transfer calculations. As IRIS data reveal this feature, about 100 200 km away from center high altitude cold (∼ 230 K), it inferred feature related sprea...