Atmospheric CO2, delta(O-2/N-2), APO and oxidative ratios from aircraft flask samples over Fyodorovskoye, Western Russia

S. van der Laan, I. T. van der Laan-Luijkx, C. Roedenbeck, A. Varlagin, I. Shironya, R. E. M. Neubert, M. Ramonet, H. A. J. Meijer

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We present atmospheric CO2 and delta(O-2/N-2) from flask samples taken on board aircraft over Fyodorovskoye (56 degrees 27'N, 32 degrees 55'E) at heights of 3000 m and 100 m between 1998 and 2008. The long-term trends for CO2 and delta(O-2/N-2) are similar for both sampling heights, and also similar to observations from marine background station Mace Head (Ireland) and coastal station Lutjewad (the Netherlands). The seasonal CO2 amplitude at 100 m was almost twice as large as at 3000 m and a phase shift in the seasonality of about two weeks between both sampling heights was observed. This indicates a dominant influence on CO2 in the boundary layer from the regional biosphere which is confirmed by analysis of the delta(O-2/N-2) to CO2 oxidative ratio (OR). Together with simulations with the TM3 model, our data suggest that the observed OR of -1.7 +/- 0.2 in the free troposphere is mainly driven by exchange processes with the ocean. Within the boundary layer an OR of -0.89 +/- 0.12 was observed which supports the results of other recent studies suggesting the commonly used value of -1.1 for biospheric OR is likely too low. (C) 2014 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)174-181
Number of pages8
JournalAtmospheric Environment
Publication statusPublished - Nov 2014


  • Atmospheric CO2
  • Atmospheric delta(O-2/N-2)
  • Oxidative ratio
  • Global carbon cycle
  • APO
  • O-2/N-2
  • AIR

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