Impact of aerosol property on the accuracy of a CO2 retrieval algorithm from satellite remote sensing

Yeonjin Jung, Jhoon Kim, Woogyung Kim, Hartmut Boesch, Hanlim Lee, Chunho Cho, Tae Young Goo

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Based on an optimal estimation method, an algorithm was developed to retrieve the column-averaged dry-air mole fraction of carbon dioxide (XCO2) using Shortwave Infrared (SWIR) channels, referred to as the Yonsei CArbon Retrieval (YCAR) algorithm. The performance of the YCAR algorithm is here examined using simulated radiance spectra, with simulations conducted using different Aerosol Optical Depths (AODs), Solar Zenith Angles (SZAs) and aerosol types over various surface types. To characterize the XCO2 retrieval algorithm, reference tests using simulated spectra were analysed through a posteriori XCO2 retrieval errors and averaging kernels. The a posteriori XCO2 retrieval errors generally increase with increasing SZA. However, errors were found to be small (< 1.3 ppm) over vegetation surfaces. Column averaging kernels are generally close to unity near the surface and decrease with increasing altitude. For dust aerosol with an AOD of 0.3, the retrieval loses its sensitivity near the surface due to the influence of atmospheric scattering, with the peak of column averaging kernels at ~800 hPa. In addition, we performed a sensitivity analysis of the principal state vector elements with respect to XCO2 retrievals. The reference tests with the inherent error of the algorithm showed that overall XCO2 retrievals work reasonably well. The XCO2 retrieval errors with respect to state vector elements are shown to be < 0.3 ppm. Information on aerosol optical properties is the most important factor affecting the XCO2 retrieval algorithm. Incorrect information on the aerosol type can lead to significant errors in XCO2 retrievals of up to 2.5 ppm. The XCO2 retrievals using the Thermal and Near-infrared Sensor for carbon Observation (TANSO)-Fourier Transform Spectrometer (FTS) L1B spectra were biased by 2.78 ± 1.46 ppm and 1.06 ± 0.85 ppm at the Saga and Tsukuba sites, respectively. This study provides important information regarding estimations of the effects of aerosol properties on the CO2 retrieval algorithm. An understanding of these effects can contribute to improvements in the accuracy of XCO2 retrievals, especially combined with an aerosol retrieval algorithm.

Original languageEnglish
Article number322
JournalRemote Sensing
Volume8
Issue number4
DOIs
Publication statusPublished - 2016 Jan 1

Fingerprint

aerosol property
remote sensing
aerosol
zenith angle
optical depth
carbon
estimation method
radiance
optical property
Fourier transform
sensitivity analysis
near infrared
spectrometer
carbon dioxide
scattering
sensor
dust
vegetation
air

All Science Journal Classification (ASJC) codes

  • Earth and Planetary Sciences(all)

Cite this

Jung, Yeonjin ; Kim, Jhoon ; Kim, Woogyung ; Boesch, Hartmut ; Lee, Hanlim ; Cho, Chunho ; Goo, Tae Young. / Impact of aerosol property on the accuracy of a CO2 retrieval algorithm from satellite remote sensing. In: Remote Sensing. 2016 ; Vol. 8, No. 4.
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Impact of aerosol property on the accuracy of a CO2 retrieval algorithm from satellite remote sensing. / Jung, Yeonjin; Kim, Jhoon; Kim, Woogyung; Boesch, Hartmut; Lee, Hanlim; Cho, Chunho; Goo, Tae Young.

In: Remote Sensing, Vol. 8, No. 4, 322, 01.01.2016.

Research output: Contribution to journalArticle

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AU - Kim, Jhoon

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