Development of the empirical orthogonal functions-based algorithm for the retrievals of atmospheric CO2 total column amount from space-borne observations of reflected sunlight

Andrey Bril; Shamil Maksyutov; Sergey Oshchepkov; Yukio Yoshida; Ryoichi Imasu; Chisa Iwasaki; Anatoli Chaikovsky; Anton Fedarenka

doi:10.1117/1.JRS.12.046012

31 October 2018 Development of the empirical orthogonal functions-based algorithm for the retrievals of atmospheric CO₂ total column amount from space-borne observations of reflected sunlight

Andrey Bril, Shamil Maksyutov, Sergey Oshchepkov, Yukio Yoshida, Ryoichi Imasu, Chisa Iwasaki, Anatoli Chaikovsky, Anton Fedarenka

Author Affiliations +

Journal of Applied Remote Sensing, Vol. 12, Issue 4, 046012 (October 2018). https://doi.org/10.1117/1.JRS.12.046012

Abstract

We present further development of the empirical orthogonal functions (EOF)-based retrieval algorithm. The algorithm output is a regression formula that relates principal components of the reflected sunlight spectra with CO₂ total column amount. The algorithm was implemented and tested for the observations from the Japanese satellite Greenhouse gases Observing Satellite (GOSAT). Training of the EOF-based algorithm with the collocated ground-based and space-borne data (e.g., Total Carbon Column Observing Network and GOSAT observations, respectively) was shown to impose some errors that were interpreted as a result of implicit averaging over the collocation area. Alternative training with the small subset (∼5 % to 10%) of the full-physics algorithm is free of such errors; however, this option requires additional filtering of the space-borne observations that are strongly affected by atmospheric light scattering. This filtering was implemented by the comparison of the EOF-regression estimates of surface pressure with corresponding meteorological data.

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Andrey Bril, Shamil Maksyutov, Sergey Oshchepkov, Yukio Yoshida, Ryoichi Imasu, Chisa Iwasaki, Anatoli Chaikovsky, and Anton Fedarenka "Development of the empirical orthogonal functions-based algorithm for the retrievals of atmospheric CO₂ total column amount from space-borne observations of reflected sunlight," Journal of Applied Remote Sensing 12(4), 046012 (31 October 2018). https://doi.org/10.1117/1.JRS.12.046012

Received: 18 July 2018; Accepted: 5 October 2018; Published: 31 October 2018

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