To remote sensing scientists, peering directly into the eye of a tropical storm is like hitting a hole in one. Thatâs exactly what NASAâs CloudSat satellite did on May 16th, completing a stunning overpass of Typhoon Dolphin as the category 4 storm churned across the west Pacific.
Image: NASA Earth Observatory
CloudSat, which comprises part of NASAâs Earth-orbiting observatory, sends pulses of microwave energy through our planetâs atmosphere, some of which is reflected back to the spacecraft. Conceptually, CloudSat is similar to another tool we looked at last week, RapidScat, which NASA uses for mapping wind speed and direction. The strength of the signal CloudSat receives is related to the amount of ice or water in a cloud, while the time delay can be used to calculate the distance between the cloud and the Earthâs surface.In the image directly below the aerial view of Typhoon Dolphin, we see the storm in cross section, with darker blues representing heavier precipitation. Combining this data with infrared images collected from Japanâs MTSTAT satellite, researchers produced another cross-sectional view of the stormâs eye and its overall cloud structure:
MTSTAT and CloudSat imagery of Typhoon Dolphin. Image Credit: Natalie D. Tourville/Colorado State University
Whatâs amazing about these images is that CloudSat, scanning the entire Earth, has a field of view of just 0.5 square miles. Zeroing in on a tropical storm is difficult enough, but most cyclones are over 250 miles wide, while the eye of the storm is a small fraction of that size. A hole in one, indeed.[NASA | NASA Earth Observatory]
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