SI-Traceability and Measurement Uncertainty of the Atmospheric Infrared Sounder Version 5 Level 1B Radiances

Remote Sensing

Chase Cañas¹  HartmutH. Aumann¹  EvanM. Manning¹  ThomasS. Pagano¹  StevenE. Broberg¹  KennethO. Overoye²  RobertC. Wilson³ 

[1] Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, 91109, USA;Millenium Engineering and Integration Company, Inc., 22202, Arlington, VA, USA;Raytheon Company, Waltham, MA, 02451, USA;

关键词: infrared;    hyperspectral;    satellite;    radiometric;    calibration;    sounder;   

DOI  :  10.3390/rs12081338

来源: DOAJ

【 摘 要 】

The Atmospheric Infrared Sounder (AIRS) on the EOS Aqua Spacecraft was launched on May 4, 2002. The AIRS is designed to measure atmospheric temperature and water vapor profiles and has demonstrated exceptional radiometric and spectral accuracy and stability in orbit. The International System of Units (SI)-traceability of the derived radiances is achieved by transferring the calibration from the Large Area Blackbody (LABB) with SI traceable temperature sensors, to the On-Board Calibrator (OBC) blackbody during preflight testing. The AIRS views the OBC blackbody and four full aperture space views every scan. A recent analysis of pre-flight and on-board data has improved our understanding of the measurement uncertainty of the Version 5 AIRS L1B radiance product. For temperatures greater than 260 K, the measurement uncertainty is better than 250 mK 1-sigma for most channels. SI-traceability and quantification of the radiometric measurement uncertainty is critical to reducing biases in reanalysis products and radiative transfer models (RTMs) that use AIRS data, as well as establishing the suitability of AIRS as a benchmark for radiances established in the early 2000s.

【 授权许可】

Unknown