Correlation of Venusian Mesoscale Cloud Morphology Between Images Acquired at Various Wavelengths
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS(2022)
摘要
The differences and similarities in morphologies acquired across various wavelengths in simultaneously obtained Venus' dayside images may provide clues on cloud/atmospheric physics and chemistry. Here, we focus on spatial scales smaller than similar to 600 km, where cell-like or streaky features seem to dominate in ultraviolet images. Using images acquired at ultraviolet wavelengths of 283 nm, 365 nm, and infrared wavelengths of 0.90, 2.02, and 10 mu m by the Venus orbiter Akatsuki, correlation coefficient maps between pairs of wavelengths, such as 2.02 mu m/10 mu m, 2.02 mu m/283 nm, 2.02 mu m/365 nm, 283 nm/365 nm, and 0.90 mu m/2.02 mu m were created. Our results show a clear negative correlation between images obtained at 2.02 mu m (CO2 absorption) and 10 mu m (cloud top temperature), meaning that elevated clouds are cooled by adiabatic expansion or the ambient air. A clear negative correlation was found between 2.02 mu m and 283 nm (SO2 absorption), suggesting that SO2 is transported to the cloud top region during cloud ascent. We observed a clear positive correlation between images obtained at 283 and 365 nm (unknown absorber), implying a close relationship between the unknown absorber and SO2 or a non-negligible contribution of the unknown absorber at 283 nm. We found a low correlation between images obtained at 0.90 mu m (middle/lower cloud) and 2.02 mu m, suggesting a weak vertical coupling in the clouds.
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关键词
Venus,cloud,image,akatsuki,correlation
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