Warm spring reduced carbon cycle impact of the 2012 US summer drought Public Deposited

http://ir.library.oregonstate.edu/concern/articles/g445cf968

Data deposition: The eddy-covariance data are available in the AmeriFlux data archive at the Carbon Dioxide Information Analysis Center at the Oak Ridge National Laboratory (cdiac.ornl.gov/ftp/ameriflux/data).

To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The article is published by National Academy of Sciences and can be found at:  http://www.pnas.org/

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  • The global terrestrial carbon sink offsets one-third of the world’s fossil fuel emissions, but the strength of this sink is highly sensitive to large-scale extreme events. In 2012, the contiguous United States experienced exceptionally warm temperatures and the most severe drought since the Dust Bowl era of the 1930s, resulting in substantial economic damage. It is crucial to understand the dynamics of such events because warmer temperatures and a higher prevalence of drought are projected in a changing climate. Here, we combine an extensive network of direct ecosystem flux measurements with satellite remote sensing and atmospheric inverse modeling to quantify the impact of the warmer spring and summer drought on biosphere-atmosphere carbon and water exchange in 2012. We consistently find that earlier vegetation activity increased spring carbon uptake and compensated for the reduced uptake during the summer drought, which mitigated the impact on net annual carbon uptake. The early phenological development in the Eastern Temperate Forests played a major role for the continental-scale carbon balance in 2012. The warm spring also depleted soil water resources earlier, and thus exacerbated water limitations during summer. Our results show that the detrimental effects of severe summer drought on ecosystem carbon storage can be mitigated by warming-induced increases in spring carbon uptake. However, the results also suggest that the positive carbon cycle effect of warm spring enhances water limitations and can increase summer heating through biosphere–atmosphere feedbacks.
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  • Wolf, S., Keenan, T. F., Fisher, J. B., Baldocchi, D. D., Desai, A. R., Richardson, A. D., ... & van der Laan-Luijkx, I. T. (2016). Warm spring reduced carbon cycle impact of the 2012 US summer drought. Proceedings of the National Academy of Sciences, 113(21), 5880-5885. doi:10.1073/pnas.1519620113
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  • description.provenance : Submitted by Open Access (openaccess@library.oregonstate.edu) on 2016-06-27T15:52:16Z No. of bitstreams: 2 WolfWarmSpringReduced.pdf: 1268575 bytes, checksum: dca1623b2159a509adf3aefa54f34152 (MD5) WolfWarmSpringReducedSupportingInformation.pdf: 2851387 bytes, checksum: 10d33c17a85411315d0efbfd0b1fac5c (MD5)
  • description.provenance : Made available in DSpace on 2016-06-28T18:08:41Z (GMT). No. of bitstreams: 3 krauserp1267816855.zip: 3849147 bytes, checksum: 45363c8c22ec1a888a7d23b5fbd56342 (MD5) WolfWarmSpringReduced.pdf: 1268575 bytes, checksum: dca1623b2159a509adf3aefa54f34152 (MD5) WolfWarmSpringReducedSupportingInformation.pdf: 2851387 bytes, checksum: 10d33c17a85411315d0efbfd0b1fac5c (MD5) Previous issue date: 2016-05-24
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2016-06-28T18:08:41Z (GMT) No. of bitstreams: 3 krauserp1267816855.zip: 3849147 bytes, checksum: 45363c8c22ec1a888a7d23b5fbd56342 (MD5) WolfWarmSpringReduced.pdf: 1268575 bytes, checksum: dca1623b2159a509adf3aefa54f34152 (MD5) WolfWarmSpringReducedSupportingInformation.pdf: 2851387 bytes, checksum: 10d33c17a85411315d0efbfd0b1fac5c (MD5)

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