Anomalous carbon uptake in Australia as seen by GOSAT

Detmers, R. G.; Hasekamp, Otto; Aben, I.; Houweling, Sander; Leeuwen, T. T. van; Butz, A.; Landgraf, Jochen; Köhler, Philipp; Guanter, Luis; Poulter, Benjamin

doi:10.1002/2015gl065161

Cited by 53 publications

(51 citation statements)

References 35 publications

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“…The magnitude of the 2010–11 enhanced land carbon sink as derived from GOSAT inversion in this study, if reported based on calendar year, was 0.77 Pg in 2011, which is very similar with 0.79 Pg C reported by Poulter et al 8. or 0.86 Pg C from another recent study37.…”

Section: Resultssupporting

confidence: 91%

Drought rapidly diminishes the large net CO2 uptake in 2011 over semi-arid Australia

Huete

Cleverly

et al. 2016

Sci Rep

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Each year, terrestrial ecosystems absorb more than a quarter of the anthropogenic carbon emissions, termed as land carbon sink. An exceptionally large land carbon sink anomaly was recorded in 2011, of which more than half was attributed to Australia. However, the persistence and spatially attribution of this carbon sink remain largely unknown. Here we conducted an observation-based study to characterize the Australian land carbon sink through the novel coupling of satellite retrievals of atmospheric CO2 and photosynthesis and in-situ flux tower measures. We show the 2010–11 carbon sink was primarily ascribed to savannas and grasslands. When all biomes were normalized by rainfall, shrublands however, were most efficient in absorbing carbon. We found the 2010–11 net CO2 uptake was highly transient with rapid dissipation through drought. The size of the 2010–11 carbon sink over Australia (0.97 Pg) was reduced to 0.48 Pg in 2011–12, and was nearly eliminated in 2012–13 (0.08 Pg). We further report evidence of an earlier 2000–01 large net CO2 uptake, demonstrating a repetitive nature of this land carbon sink. Given a significant increasing trend in extreme wet year precipitation over Australia, we suggest that carbon sink episodes will exert greater future impacts on global carbon cycle.

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Section: Resultssupporting

confidence: 91%

Drought rapidly diminishes the large net CO2 uptake in 2011 over semi-arid Australia

Huete

Cleverly

et al. 2016

Sci Rep

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“…6a), which is largely due to the contribution from Australia as consistent with the indication by previous works (Poulter et al 2014;Detmers et al 2015) (Fig. 6d).…”

Section: Discussionsupporting

confidence: 81%

The Effect of GOSAT Observations on Estimates of Net CO<sub>2</sub> Flux in Semi-Arid Regions of the Southern Hemisphere

Kondo

Saeki

Takagi

et al. 2016

SOLA

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Greenhouse gases Observing SATellite (GOSAT) is the operational satellite dedicated to atmospheric CO 2 observations. Assimilation of data provided by GOSAT is expected to yield reliable CO 2 fluxes in semi-arid regions because of frequent observations owing to clear skies. Here we estimated net CO 2 flux over semi-arid regions of the Southern Hemisphere using the GOSAT column averaged CO 2 (X CO2 ) and surface CO 2 measurements. Assimilation of GOSAT X CO2 indicated that semi-arid regions are integral components of recent terrestrial CO 2 uptake, accounting for 44% globally. Compared with estimates assimilated from surface measurements, estimates by GOSAT X CO2 suggest a 50% reduction in the semi-arid CO 2 uptake, amounting to 1.1 Pg C yr −1 . Significant estimation differences occurred for South America and South Africa, where the GOSAT makes frequent measurements but where surface CO 2 measurements are limited. In comparison, the two estimates varied less in Australia, where more surface measurements are available. These results suggest that GOSAT X CO2 is effective at regulating excess estimates of semi-arid CO 2 uptake in regions that are less constrained by surface CO 2 measurements. To promote understanding of climate change effects in semi-arid regions, it is important to continue monitoring trends in CO 2 uptake with GOSAT.(Citation: Kondo, M., T. Saeki, H. Takagi, K. Ichii, and K. Ishijima, 2016: The effect of GOSAT observations on estimates of net CO 2 flux in semi-arid regions of the Southern Hemisphere.

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“…The X CO 2 derived from GOSAT has an accuracy on the order of a few tens of a percent (Butz et al, 2011;Guerlet et al, 2013b;Buchwitz et al, 2017a). X CO 2 retrievals with this level of accuracy can provide valuable information on the variation of CO 2 (Rayner and O'Brien, 2001;Houweling et al, 2004;Guerlet et al, 2013a;Basu et al, 2014;Detmers et al, 2015). In July 2014, NASA's Orbiting Carbon Observatory-2 (OCO-2) satellite was successfully launched.…”

Section: Introductionmentioning

confidence: 99%

Carbon dioxide retrieval from OCO-2 satellite observations using the RemoTeC algorithm and validation with TCCON measurements

Hasekamp

et al. 2018

Atmos. Meas. Tech.

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Abstract. In this study we present the retrieval of the column-averaged dry air mole fraction of carbon dioxide (X CO 2 ) from the Orbiting Carbon Observatory-2 (OCO-2) satellite observations using the RemoTeC algorithm, previously successfully applied to retrieval of greenhouse gas concentration from the Greenhouse Gases Observing Satellite (GOSAT). The X CO 2 product has been validated with collocated ground-based measurements from the Total Carbon Column Observing Network (TCCON) for almost 2 years of OCO-2 data from September 2014 to July 2016. We found that fitting an additive radiometric offset in all three spectral bands of OCO-2 significantly improved the retrieval. Based on a small correlation of the X CO 2 error over land with goodness of fit, we applied an a posteriori bias correction to our OCO-2 retrievals. In overpass averaged results, X CO 2 retrievals have an SD of ∼ 1.30 ppm and a station-tostation variability of ∼ 0.40 ppm among collocated TCCON sites. The seasonal relative accuracy (SRA) has a value of 0.52 ppm. The validation shows relatively larger difference with TCCON over high-latitude areas and some specific regions like Japan.

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Anomalous carbon uptake in Australia as seen by GOSAT

Cited by 53 publications

References 35 publications

Drought rapidly diminishes the large net CO2 uptake in 2011 over semi-arid Australia

Drought rapidly diminishes the large net CO2 uptake in 2011 over semi-arid Australia

The Effect of GOSAT Observations on Estimates of Net CO<sub>2</sub> Flux in Semi-Arid Regions of the Southern Hemisphere

Carbon dioxide retrieval from OCO-2 satellite observations using the RemoTeC algorithm and validation with TCCON measurements

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