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| Titel |
Inter-annual variability in CO2 exchange in Northern Eurasia inferred from GOSAT-XCO2 |
| VerfasserIn |
Misa Ishizawa, Kazuo Mabuchi, Tomoko Shirai, Makoto Inoue, Isamu Morino, Yukio Yoshida, Ruslan Zhuravlev, Alex Ganshin, Dmitry Belikov, Makoto Saito, Tomohiro Oda, Vinu Valsala, Osamu Uchino, Tatsuya Yokota, Shamil Maksyutov |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250108425
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| Publikation (Nr.) |
 EGU/EGU2015-8177.pdf |
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| Zusammenfassung |
| The monthly CO2 fluxes for three regions in Northern Eurasia (north of ~60˚N), East Europe, West Siberia and East Siberia, were estimated for three consecutive growing seasons from 2009-2011 using the Greenhouse Gases Observing Satellite (GOSAT) column-averaged dry-air mole fraction of CO2 (XCO2) and Observation Package (ObsPack) products of surface atmospheric CO2 concentration, and examined the inter-annual variations of estimated CO2 fluxes in terms of the regional climate variability. The results show the anomalies of CO2 fluxes are overall reasonably correlated with the anomalies of surface temperature, shortwave radiation, and Normalized Difference Vegetation Index (NDVI). In particular, the estimated CO2 fluxes using GOSAT XCO2 along with ground-based observations show strong correlations with surface temperature in July and August, while no correlation is found in the estimated CO2 fluxes using ground-based observations only. This indicates that GOSAT XCO2 reflect the changes in terrestrial biospheric processes responding to the climate anomalies. In 2010, large part of Eurasia experienced an extremely hot and dry summer, while lower temperature was recorded in Northern West Siberia. The estimated CO2 fluxes with GOSAT XCO2 show reduced net CO2 uptake in East Europe and East Siberia, but enhanced net CO2 uptake in West Siberia. These opposite anomalies of estimated CO2 flux can be explained by the opposite temperature anomalies among the Northern Eurasia. Thus we conclude that GOSAT XCO2 compensates for the lack of observational coverage by ground-based measurements so as to better capture the varying atmosphere-terrestrial biosphere CO2 exchange in a regional scale. |
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