Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6339773 | Atmospheric Environment | 2014 | 8 Pages |
Abstract
We present atmospheric CO2 and δ(O2/N2) from flask samples taken on board aircraft over Fyodorovskoye (56°27â²N, 32°55â²E) at heights of 3000 m and 100 m between 1998 and 2008. The long-term trends for CO2 and δ(O2/N2) 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 δ(O2/N2) to CO2 oxidative ratio (OR). Together with simulations with the TM3 model, our data suggest that the observed OR of â1.7 ± 0.2 in the free troposphere is mainly driven by exchange processes with the ocean. Within the boundary layer an OR of â0.89 ± 0.12 was observed which supports the results of other recent studies suggesting the commonly used value of â1.1 for biospheric OR is likely too low.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Atmospheric Science
Authors
S. van der Laan, I.T. van der Laan-Luijkx, C. Rödenbeck, A. Varlagin, I. Shironya, R.E.M. Neubert, M. Ramonet, H.A.J. Meijer,