Articles | Volume 16, issue 2
https://doi.org/10.5194/amt-16-603-2023
https://doi.org/10.5194/amt-16-603-2023
Research article
 | 
31 Jan 2023
Research article |  | 31 Jan 2023

Evaluation of the spectral misalignment on the Earth Clouds, Aerosols and Radiation Explorer/multi-spectral imager cloud product

Minrui Wang, Takashi Y. Nakajima, Woosub Roh, Masaki Satoh, Kentaroh Suzuki, Takuji Kubota, and Mayumi Yoshida

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Cited articles

Albiñana, A. P., Gelsthorpe, R., Lefebvre, A., Sauer, M., Weih, E., Kruse, K., Münzenmayer, R., Baister, G., and Chang, M.: The multi-spectral imager on board the EarthCARE spacecraft, Infrared Remote Sensing and Instrumentation XVIII, edited by: Strojnik, M. and Paez, G., International Society for Optical Engineering, SPIE Proceedings, 7808, 780–815, https://doi.org/10.1117/12.858864, 2010. 
Brenguier, J.-L., Burnet, F., and Geoffroy, O.: Cloud optical thickness and liquid water path – does the k coefficient vary with droplet concentration?, Atmos. Chem. Phys., 11, 9771–9786, https://doi.org/10.5194/acp-11-9771-2011, 2011. 
Dadon, A., Ben-Dor, E., and Karnieli, A.: Use of derivative calculations and minimum noise fraction transform for detecting and correcting the spectral curvature effect (smile) in Hyperion Images, IEEE T. Geosci. Remote, 48, 2603–2612, https://doi.org/10.1109/TGRS.2010.2040391, 2010. 
ESA: Technical note – MERIS smile effect characterization and correction, https://earth.esa.int/eogateway/documents/20142/37627/MERIS-Smile-Effect-Characterisation-and-correction.pdf (last access: 14 July 2021​​​​​​​), 2008. 
Fisher, J., Baumback, M., Bowles, J., Grosman, J., and Antoniades, J.: Comparison of low-cost hyperspectral sensors, Proc. SPIE, 3438, 23–30, 1998. 
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Short summary
SMILE (a spectral misalignment in which a shift in the center wavelength appears as a distortion in the spectral image) was detected during our recent work. To evaluate how it affects the cloud retrieval products, we did a simulation of EarthCARE-MSI forward radiation, evaluating the error in simulated scenes from a global cloud system-resolving model and a satellite simulator. Our results indicated that the error from SMILE was generally small and negligible for oceanic scenes.