Preprints
https://doi.org/10.5194/amt-2021-237
https://doi.org/10.5194/amt-2021-237

  07 Sep 2021

07 Sep 2021

Review status: this preprint is currently under review for the journal AMT.

Investigation of space-borne trace gas products over St. Petersburg and Yekaterinburg, Russia by using COCCON observations

Carlos Alberti1,, Qiansi Tu1,, Frank Hase1, Maria V. Makarova2, Konstantin Gribanov3, Stefani C. Foka2, Vyacheslav Zakharov3, Thomas Blumenstock1, Michael Buchwitz4, Christopher Diekmann1, Benjamin Ertl5, Matthias M. Frey1,a, Hamud Kh. Imhasin2, Dmitry V. Ionov2, Farahnaz Khosrawi1, Sergey I. Osipov2, Maximilian Reuter4, Matthias Schneider1, and Thorsten Warneke4 Carlos Alberti et al.
  • 1Institute of Meteorology and Climate Research (IMK-ASF), Karlsruhe Institute of Technology, Karlsruhe, Germany
  • 2Department of Atmospheric Physics, Faculty of Physics, St. Petersburg State University, St. Petersburg, Russia
  • 3Institute of Natural Sciences and Mathematics, Ural Federal University, Yekaterinburg, 620000, Russia
  • 4Institute of Environmental Physics and Institute of Remote Sensing, University of Bremen, Bremen, Germany
  • 5Karlsruhe Institute of Technology, Steinbuch Centre for Computing (SCC), Karlsruhe, Germany
  • anow at: National Institute for Environmental Studies (NIES), Tsukuba, Japan
  • These authors contributed equally to this work.

Abstract. This work employs ground- and space-based observations, together with model data to study columnar abundances of atmospheric trace gases (XH2O, XCO2, XCH4, and XCO) in two high-latitude Russian cities, St. Petersburg and Yekaterinburg. Two portable COllaborative Column Carbon Observing Network (COCCON) spectrometers were used for continuous measurements at these locations during 2019 and 2020. Additionally, a subset of data of special interest (a strong gradient in XCH4 and XCO was detected) collected in the framework of a mobile city campaign performed in 2019 using both instruments is investigated. All studied satellite products (TROPOMI, OCO-2, GOSAT, MUSICA IASI) show generally good agreement with COCCON observations. Satellite and ground-based observations at high latitude are much sparser than at low or mid latitude, which makes direct coincident comparisons between remote-sensing observations more difficult. Therefore, a method of scaling continuous CAMS model data to the ground-based observations is developed and used for creating virtual COCCON observations. These adjusted CAMS data are then used for satellite validation, showing good agreement in both Peterhof and Yekaterinburg cities. The gradients between the two study sites (ΔXgas) are similar between CAMS and CAMS-COCCON data sets, indicating that the model gradients are in agreement with the gradients observed by COCCON. This is further supported by a few simultaneous COCCON and satellite ΔXgas measurements, which also agree with the model gradient. With respect to the city campaign observations recorded in St. Petersburg, the downwind COCCON station measured obvious enhancements for both XCH4 (10.6 ppb) and XCO (9.5 ppb), which is nicely reflected by TROPOMI observations, which detect city-scale gradients of the order 9.4 ppb for XCH4 and 12.5 ppb XCO, respectively.

Carlos Alberti et al.

Status: open (until 13 Oct 2021)

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Carlos Alberti et al.

Carlos Alberti et al.

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Short summary
Satellite and ground-based observations at high latitude are much sparser than at low or mid latitude, which makes direct coincident comparisons between remote-sensing observations more difficult. Therefore, a method of scaling continuous CAMS model data to the ground-based observations is developed and used for creating virtual COCCON observations. These adjusted CAMS data are then used for satellite inter-comparison, showing good agreement in both Peterhof and Yekaterinburg cities.