Separating the influence of temperature, drought, and fire on interannual variability in atmospheric CO 2
dc.contributor.author | Keppel‐aleks, Gretchen | en_US |
dc.contributor.author | Wolf, Aaron S. | en_US |
dc.contributor.author | Mu, Mingquan | en_US |
dc.contributor.author | Doney, Scott C. | en_US |
dc.contributor.author | Morton, Douglas C. | en_US |
dc.contributor.author | Kasibhatla, Prasad S. | en_US |
dc.contributor.author | Miller, John B. | en_US |
dc.contributor.author | Dlugokencky, Edward J. | en_US |
dc.contributor.author | Randerson, James T. | en_US |
dc.date.accessioned | 2015-01-07T15:24:04Z | |
dc.date.available | WITHHELD_11_MONTHS | en_US |
dc.date.available | 2015-01-07T15:24:04Z | |
dc.date.issued | 2014-11 | en_US |
dc.identifier.citation | Keppel‐aleks, Gretchen ; Wolf, Aaron S.; Mu, Mingquan; Doney, Scott C.; Morton, Douglas C.; Kasibhatla, Prasad S.; Miller, John B.; Dlugokencky, Edward J.; Randerson, James T. (2014). "Separating the influence of temperature, drought, and fire on interannual variability in atmospheric CO 2 ." Global Biogeochemical Cycles 28(11): 1295-1310. | en_US |
dc.identifier.issn | 0886-6236 | en_US |
dc.identifier.issn | 1944-9224 | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/109962 | |
dc.description.abstract | The response of the carbon cycle in prognostic Earth system models (ESMs) contributes significant uncertainty to projections of global climate change. Quantifying contributions of known drivers of interannual variability in the growth rate of atmospheric carbon dioxide (CO 2 ) is important for improving the representation of terrestrial ecosystem processes in these ESMs. Several recent studies have identified the temperature dependence of tropical net ecosystem exchange (NEE) as a primary driver of this variability by analyzing a single, globally averaged time series of CO 2 anomalies. Here we examined how the temporal evolution of CO 2 in different latitude bands may be used to separate contributions from temperature stress, drought stress, and fire emissions to CO 2 variability. We developed atmospheric CO 2 patterns from each of these mechanisms during 1997–2011 using an atmospheric transport model. NEE responses to temperature, NEE responses to drought, and fire emissions all contributed significantly to CO 2 variability in each latitude band, suggesting that no single mechanism was the dominant driver. We found that the sum of drought and fire contributions to CO 2 variability exceeded direct NEE responses to temperature in both the Northern and Southern Hemispheres. Additional sensitivity tests revealed that these contributions are masked by temporal and spatial smoothing of CO 2 observations. Accounting for fires, the sensitivity of tropical NEE to temperature stress decreased by 25% to 2.9 ± 0.4 Pg C yr −1 K −1 . These results underscore the need for accurate attribution of the drivers of CO 2 variability prior to using contemporary observations to constrain long‐term ESM responses. Key Points Accurate attribution of CO 2 variability is required to constrain coupled models Combined influence of drought and fire exceed ecosystem responses to temperature Temporal and spatial smoothing of CO 2 observations masks variability from fire | en_US |
dc.publisher | Wiley Periodicals, Inc. | en_US |
dc.subject.other | Atmospheric CO 2 | en_US |
dc.subject.other | Carbon Cycle | en_US |
dc.subject.other | Drought | en_US |
dc.subject.other | Fire | en_US |
dc.subject.other | Terrestrial Ecosystems | en_US |
dc.subject.other | Climate Variability | en_US |
dc.title | Separating the influence of temperature, drought, and fire on interannual variability in atmospheric CO 2 | en_US |
dc.type | Article | en_US |
dc.rights.robots | IndexNoFollow | en_US |
dc.subject.hlbsecondlevel | Geological Sciences | en_US |
dc.subject.hlbtoplevel | Science | en_US |
dc.description.peerreviewed | Peer Reviewed | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/109962/1/gbc20215.pdf | |
dc.identifier.doi | 10.1002/2014GB004890 | en_US |
dc.identifier.source | Global Biogeochemical Cycles | en_US |
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dc.owningcollname | Interdisciplinary and Peer-Reviewed |
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