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Carbon dioxide retrieval from OCO-2 satellite observations using the RemoTeC algorithm and validation with TCCON measurements

Journal Article


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Abstract


  • In this study we present the retrieval of the column-averaged dry air mole fraction of carbon dioxide (X CO2 ) from the Orbiting Carbon Observatory-2 (OCO-2) satellite observations using the RemoTeC algorithm, previously successfully applied to retrieval of greenhouse gas concentration from the Greenhouse Gases Observing Satellite (GOSAT). The X CO2 product has been validated with collocated ground-based measurements from the Total Carbon Column Observing Network (TCCON) for almost 2 years of OCO-2 data from September 2014 to July 2016. We found that fitting an additive radiometric offset in all three spectral bands of OCO-2 significantly improved the retrieval. Based on a small correlation of the XCO2 error over land with goodness of fit, we applied an a posteriori bias correction to our OCO-2 retrievals. In overpass averaged results, XCO2 retrievals have an SD of ∼ 1.30 ppm and a station-to-station variability of ∼ 0.40 ppm among collocated TCCON sites. The seasonal relative accuracy (SRA) has a value of 0.52 ppm. The validation shows relatively larger difference with TCCON over high-latitude areas and some specific regions like Japan.

UOW Authors


  •   Wu, Lianghai (external author)
  •   Hasekamp, Otto (external author)
  •   Hu, Haili (external author)
  •   Landgraf, J (external author)
  •   Butz, Andre (external author)
  •   aan de Brugh, Joost (external author)
  •   Aben, Ilse (external author)
  •   Pollard, David F. (external author)
  •   Griffith, David
  •   Feist, Dietrich G. (external author)
  •   Koshelev, Dmitry (external author)
  •   Hase, Frank (external author)
  •   Toon, Geoffrey C. (external author)
  •   Ohyama, Hirofumi (external author)
  •   Morino, Isamu (external author)
  •   Notholt, Justus (external author)
  •   Shiomi, Kei (external author)
  •   Iraci, Laura T. (external author)
  •   Schneider, Matthias (external author)
  •   de Maziere, Martine (external author)
  •   Sussmann, Ralf (external author)
  •   Kivi, Rigel (external author)
  •   Warneke, Thorsten (external author)
  •   Goo, Tae-Young (external author)
  •   Te, Yao (external author)

Publication Date


  • 2018

Citation


  • Wu, L., Hasekamp, O., Hu, H., Landgraf, J., Butz, A., aan de Brugh, J., Aben, I., Pollard, D. F., Griffith, D. W. T., Feist, D. G., Koshelev, D., Hase, F., Toon, G. C., Ohyama, H., Morino, I., Notholt, J., Shiomi, K., Iraci, L., Schneider, M., de Maziere, M., Sussmann, R., Kivi, R., Warneke, T., Goo, T. & Te, Y. (2018). Carbon dioxide retrieval from OCO-2 satellite observations using the RemoTeC algorithm and validation with TCCON measurements. Atmospheric Measurement Techniques, 11 (5), 3111-3130.

Scopus Eid


  • 2-s2.0-85047825456

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=1087&context=smhpapers1

Ro Metadata Url


  • http://ro.uow.edu.au/smhpapers1/86

Number Of Pages


  • 19

Start Page


  • 3111

End Page


  • 3130

Volume


  • 11

Issue


  • 5

Place Of Publication


  • Germany

Abstract


  • In this study we present the retrieval of the column-averaged dry air mole fraction of carbon dioxide (X CO2 ) from the Orbiting Carbon Observatory-2 (OCO-2) satellite observations using the RemoTeC algorithm, previously successfully applied to retrieval of greenhouse gas concentration from the Greenhouse Gases Observing Satellite (GOSAT). The X CO2 product has been validated with collocated ground-based measurements from the Total Carbon Column Observing Network (TCCON) for almost 2 years of OCO-2 data from September 2014 to July 2016. We found that fitting an additive radiometric offset in all three spectral bands of OCO-2 significantly improved the retrieval. Based on a small correlation of the XCO2 error over land with goodness of fit, we applied an a posteriori bias correction to our OCO-2 retrievals. In overpass averaged results, XCO2 retrievals have an SD of ∼ 1.30 ppm and a station-to-station variability of ∼ 0.40 ppm among collocated TCCON sites. The seasonal relative accuracy (SRA) has a value of 0.52 ppm. The validation shows relatively larger difference with TCCON over high-latitude areas and some specific regions like Japan.

UOW Authors


  •   Wu, Lianghai (external author)
  •   Hasekamp, Otto (external author)
  •   Hu, Haili (external author)
  •   Landgraf, J (external author)
  •   Butz, Andre (external author)
  •   aan de Brugh, Joost (external author)
  •   Aben, Ilse (external author)
  •   Pollard, David F. (external author)
  •   Griffith, David
  •   Feist, Dietrich G. (external author)
  •   Koshelev, Dmitry (external author)
  •   Hase, Frank (external author)
  •   Toon, Geoffrey C. (external author)
  •   Ohyama, Hirofumi (external author)
  •   Morino, Isamu (external author)
  •   Notholt, Justus (external author)
  •   Shiomi, Kei (external author)
  •   Iraci, Laura T. (external author)
  •   Schneider, Matthias (external author)
  •   de Maziere, Martine (external author)
  •   Sussmann, Ralf (external author)
  •   Kivi, Rigel (external author)
  •   Warneke, Thorsten (external author)
  •   Goo, Tae-Young (external author)
  •   Te, Yao (external author)

Publication Date


  • 2018

Citation


  • Wu, L., Hasekamp, O., Hu, H., Landgraf, J., Butz, A., aan de Brugh, J., Aben, I., Pollard, D. F., Griffith, D. W. T., Feist, D. G., Koshelev, D., Hase, F., Toon, G. C., Ohyama, H., Morino, I., Notholt, J., Shiomi, K., Iraci, L., Schneider, M., de Maziere, M., Sussmann, R., Kivi, R., Warneke, T., Goo, T. & Te, Y. (2018). Carbon dioxide retrieval from OCO-2 satellite observations using the RemoTeC algorithm and validation with TCCON measurements. Atmospheric Measurement Techniques, 11 (5), 3111-3130.

Scopus Eid


  • 2-s2.0-85047825456

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=1087&context=smhpapers1

Ro Metadata Url


  • http://ro.uow.edu.au/smhpapers1/86

Number Of Pages


  • 19

Start Page


  • 3111

End Page


  • 3130

Volume


  • 11

Issue


  • 5

Place Of Publication


  • Germany