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Carbon flux estimation for siberia by inverse modeling constrained by aircraft and tower co2 measurements

Saeki, T and Maksyutov, S and Sasakawa, M and Machida, T and Arshinov, M and Tans, P and Conway, TJ and Saito, M and Valsala, V and Oda, T and Andres, RJ and Belikov, D (2013) Carbon flux estimation for siberia by inverse modeling constrained by aircraft and tower co2 measurements. Journal of Geophysical Research D: Atmospheres, 118 (2). pp. 1100-1122.

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Being one of the largest carbon reservoirs in the world, the Siberian carbon sink however remains poorly understood due to the limited numbers of observation. We present the first results of atmospheric CO2 inversions utilizing measurements from a Siberian tower network (Japan-Russia Siberian Tall Tower Inland Observation Network; JR-STATION) and four aircraft sites, in addition to surface background flask measurements by the National Oceanic and Atmospheric Administration (NOAA). Our inversion with only the NOAA data yielded a boreal Eurasian CO2 flux of -0.56±0.79 GtC yr-1, whereas we obtained a weaker uptake of -0.35±0.61 GtC yr-1 when the Siberian data were also included. This difference is mainly explained by a weakened summer uptake, especially in East Siberia. We also found the inclusion of the Siberian data had significant impacts on inversion results over northeastern Europe as well as boreal Eurasia. The inversion with the Siberian data reduced the regional uncertainty by 22 on average in boreal Eurasia, and further uncertainty reductions up to 80 were found in eastern and western Siberia. Larger interannual variability was clearly seen in the inversion which includes the Siberia data than the inversion without the Siberia data. In the inversion with NOAA plus Siberia data, east Siberia showed a larger interannual variability than that in west and central Siberia. Finally, we conducted forward simulations using estimated fluxes and confirmed that the fit to independent measurements over central Siberia, which were not included in inversions, was greatly improved.

Item Type: Article
Additional Information: Copyright of this article belongs to American Geophysical Union.
Uncontrolled Keywords: Carbon reservoirs; Forward simulation; Independent measurement; Interannual variability; Inversion results; National Oceanic and Atmospheric Administration; Observation networks; Uncertainty reduction, Carbon; Inverse problems, Carbon dioxide, aircraft; annual variation; carbon dioxide; carbon flux; estimation method; flux measurement; measurement method; NOAA satellite; numerical model; satellite data, Siberia
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 10 Jun 2014 07:14
Last Modified: 10 Jun 2014 07:14

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