The Atmospheric Infrared Sounder (AIRS) is a grating spectrometer (R = 1200) aboard the second Earth Observing System (EOS) polar-orbiting platform, EOS Aqua. In combination with the Advanced Microwave Sounding Unit (AMSU) and the Humidity Sounder for Brazil (HSB), AIRS constitutes an innovative atmospheric sounding group of visible, infrared, and microwave sensors. The AIRS Infrared (IR) level 1C data set contains AIRS infrared calibrated and geolocated radiances in W/m2/micron/ster. This data set is generated from AIRS level 1B data. The spectral coverage of L1C data is from 3.74 to 15.4 mm. The nominal spectral resolution lambda / delta lambda = 1200. The spectrum is sampled twice per spectral resolution element in a total of 2645 spectral channels. A day of AIRS data is divided into 240 granules (scenes) each of 6-minute duration. For the AIRS IR measurements, an individual granule contains 135 pixels across-track and 90 along-track pixels; there are total of 135 x 90 = 12,150 pixels per granule. AIRS employs a 49.5 degree crosstrack scanning with a 1.1 degree instantaneous field of view (IFOV) to provide twice daily coverage of essentially the entire globe in a 1:30 PM sun synchronous orbit with the 13.5 x 13.5 km2 spatial resolution at nadir. The L1C swath products are derived from the L1B swath products. The primary purpose of the level 1C is to generate the spectra of radiances without spectral gaps caused by the instrument design and bad spectral points. The AIRS L1C data can be used for comparative (with other IR measurements) studies and for weather-climate research. As a Near Real Time (NRT) product this differs from AIRICRAD.6.7 AIRS differ from routine processing in 2 ways to meet the three hour latency requirements of the Land Atmosphere NRT Capability Earth Observing System (LANCE): (1) The NRT granules are produced without previous or subsequent granules if those granules are not available within 5 minutes, (2) the predictive ephemeris/attitude data are used rather than the definitive ephemeris/attitude.
N: 90.0 S: -90.0 E: 180.0 W: -180.0
|Association Type||Entry ID||Description||Version|
Title: AIRS version 6.6 and version 7 level-1C products
Publication Date: 2019-01-01
Author(s): Evan M. Manning, L. Larrabee Strow, and Hartmut H. Aumann
Series: Proc. SPIE 11127, Earth Observing System XXIV
Title: AIRS Level-1C and applications to cross-calibration with MODIS and CrIS
Publication Date: 2014-09-26
Author(s): Evan M. Manning, Hartmut H. Aumann, and Ali Behrangi
Series: Proc. SPIE 9218, Earth Observing Systems XIX
Title: Validation of the Atmospheric Infrared Sounder radiative transfer algorithm
Publication Date: 2006-01-01
Author(s): Strow, L.L, Hannon, S.E, De-Souza Machado, S., Motteler, H.E., and Tobin, D.C.
Series: J. Geophys. Res
Title: AIRS Near Real Time (NRT) data products<
Author(s): Thomas Hearty, Feng Ding, Ed Esfandiari, Andrey Savtchenko, Michael Theobald, Bruce Vollmer, Xin-Min Hua, Evan Manning, and Edward Olsen
|Project Short Name||Campaigns||Project Dates|
|Aqua||No campaigns listed.||No dates provided.|
|LANCE||No campaigns listed.||No dates provided.|
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GES DISC NASA Goddard Code 610.2
Greenbelt, MD 20771
Goddard Earth Sciences Data and Information Services Center
NASA Goddard Space Flight Center
Greenbelt, MD 20771
Format Type: Native
Media: Online Archive
Average File Size: 116 MB