Atmospheric Infrared Sounder
|Within Vocab||SeaVoX Device Catalogue|
|Definition||A space-based cross-track scanning instrument designed to measure the amount of infrared energy emitted from the atmosphere, with the purpose of creating three-dimensional maps of air and surface temperature, water vapour and cloud properties, as well as determining the amount of trace greenhouse gases (e.g. ozone, carbon monoxide, carbon dioxide and methane). A mirror rotating around an axis along the line of flight of the spacecraft scans the Earth on either side of the ground track and directs the infrared energy into the instrument. A total of 2378 detectors measure within the thermal infrared range of (3.7 - 15.4) micrometres, and 4 detectors measure within the visible range of (0.4 - 1.0) micrometres. The accuracy level is 1 degC in layers 1 kilometre thick for atmospheric temperature measurements, and 20 percent in layers 2 kilometres thick for humidity measurements in the troposphere. The swath centred on the nadir is approximately 49.5 degrees, and is scanned every 2 seconds. Each scan line contains 90 infrared footprints, with a resolution of 13.5 kilometres at nadir, and (41 x 21.4) kilometres at the scan extremes from a nominal orbit of 705.3 kilometres. The visible/near infrared spatial resolution is approximately 2.3 kilometres at nadir. Flown on Aqua (NASA). http://www.wmo-sat.info/oscar/instruments/view/16|
|Has Current Version||1|
||atmospheric radiometers||Mapping: 880109|
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