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NASA scientists pioneered the use of submillimeter wavelength bands, which fall between the microwave and infrared on the electromagnetic spectrum, to sense ice clouds. However, until IceCube, these instruments had flown only aboard high-altitude research aircraft. This meant scientists could gather data only in areas over which the aircraft flew. “With IceCube, scientists now have a working submillimeter radiometer system in space at a commercial price,” said Dong Wu, a scientist and IceCube principal investigator at NASA’s Goddard Space Flight Center. “More importantly, it provides a global view on Earth’s cloud-ice distribution,” said Wu.
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Sensing atmospheric cloud ice requires scientists deploy instruments tuned to a broad range of frequency bands. However, it is particularly important to fly submillimeter sensors. This wavelength fills a significant data gap in the middle and upper troposphere where ice clouds are often too opaque for infrared and visible sensors to penetrate. It also reveals data about the tiniest ice particles that cannot be detected clearly in other microwave bands. IceCube’s map is a first of its kind and bodes well for future space-based observations of global ice clouds using submillimeter-wave technology.
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