African Tree-Ring 250 Year d13C and Intrinsic Water-Use Efficiency (iWUE) Wils, T.H.G.; Robertson, I.; Woodborne, S.; Hall, G.; Koprowski, M.; Eshetu, Z. Wils, T.H.G. Robertson, I. Woodborne, S. Hall, G. Koprowski, M. Eshetu, Z. earth science/paleoclimate/tree ring (delta 13C,wood,null,per mil VPDB,null,tree ring,null,isotope ratio mass spectrometry,N,Koichab Valley) earth science/paleoclimate/climate reconstructions|tree ring (intrinsic water use efficiency,null,95% confidence interval upper bound,micromole per mole,null,climate reconstructions|tree ring,null,null,N,Koichab Valley) earth science/paleoclimate/tree ring (delta 13C,wood,null,per mil VPDB,null,tree ring,null,isotope ratio mass spectrometry,N,Kuskuam K7A) earth science/paleoclimate/climate reconstructions|tree ring (intrinsic water use efficiency,null,95% confidence interval upper bound,micromole per mole,null,climate reconstructions|tree ring,null,null,N,Kuskuam K4C) earth science/paleoclimate/climate reconstructions|tree ring (intrinsic water use efficiency,null,95% confidence interval upper bound,micromole per mole,null,climate reconstructions|tree ring,null,null,N,Kuskuam K5C) earth science/paleoclimate/climate reconstructions|tree ring (intrinsic water use efficiency,null,95% confidence interval upper bound,micromole per mole,null,climate reconstructions|tree ring,null,null,N,Hugumburda) earth science/paleoclimate/climate reconstructions|tree ring (intrinsic water use efficiency,null,95% confidence interval upper bound,micromole per mole,null,climate reconstructions|tree ring,null,null,N,Kuskuam K3A) earth science/paleoclimate/tree ring (delta 13C,wood,null,per mil VPDB,null,tree ring,null,isotope ratio mass spectrometry,N,Kuskuam K3A) earth science/paleoclimate/tree ring (delta 13C,wood,null,per mil VPDB,null,tree ring,null,isotope ratio mass spectrometry,N,Kuskuam K5C) earth science/paleoclimate/tree ring (delta 13C,wood,null,per mil VPDB,null,tree ring,null,isotope ratio mass spectrometry,N,Kuskuam K6A) earth science/paleoclimate/climate reconstructions|tree ring (intrinsic water use efficiency,null,95% confidence interval upper bound,micromole per mole,null,climate reconstructions|tree ring,null,null,N,Kuskuam K7A) earth science/paleoclimate/climate reconstructions|tree ring (intrinsic water use efficiency,null,95% confidence interval upper bound,micromole per mole,null,climate reconstructions|tree ring,null,null,N,Kuskuam mean) earth science/paleoclimate/climate reconstructions|tree ring (intrinsic water use efficiency,null,95% confidence interval upper bound,micromole per mole,null,climate reconstructions|tree ring,null,null,N,Kwazulu-Natal) earth science/paleoclimate/tree ring (delta 13C,wood,null,per mil VPDB,null,tree ring,null,isotope ratio mass spectrometry,N,Kuskuam K4C) earth science/paleoclimate/climate reconstructions|tree ring (intrinsic water use efficiency,null,95% confidence interval upper bound,micromole per mole,null,climate reconstructions|tree ring,null,null,N,Kuskuam K6A) earth science/paleoclimate/tree ring (age,null,null,year Common Era,null,tree ring,null,null,N,null) earth science/paleoclimate/tree ring (delta 13C,wood,null,per mil VPDB,null,tree ring,composited,isotope ratio mass spectrometry,N,Kuskuam mean) earth science/paleoclimate/tree ring (delta 13C,alpha cellulose,null,per mil VPDB,null,tree ring,null,isotope ratio mass spectrometry,N,Hugumburda) earth science/paleoclimate/tree ring (delta 13C,wood,null,per mil VPDB,null,tree ring,null,isotope ratio mass spectrometry,N,Kwazulu-Natal) earth science/paleoclimate/tree-ring (AfricaSE>LATITUDE >LONGITUDE ) Rising atmospheric CO2 concentrations affect climate directly through radiative effects and indirectly by changing plant water-use efficiency. Under global warming scenarios these widely reported changes will have a substantial impact on future bush encroachment, crop yields, river flow and climate feedbacks. Tree-ring intrinsic water-use efficiency (iWUE) records for Africa show a 24.6% increase over the 20th century. As high iWUE can partly counterbalance projected decreases in regional precipitation, this research has important implications for those involved in water resource management and highlights the need for climate models to take physiological forcing into account. STUDY NOTES: Annual carbon isotope and intrinsic water-use efficiency values from 8 trees from Ethiopia, Namibia, and South Africa IITRDB15 NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Wils, T.H.G. Investigator : Robertson, I. Investigator : Woodborne, S. Investigator : Hall, G. Investigator : Koprowski, M. Investigator : Eshetu, Z. 2016-07-05 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/20305 https://www1.ncdc.noaa.gov/pub/data/paleo/treering/isotope/africa/africa2016d13c-iwue.txt https://www1.ncdc.noaa.gov/pub/data/paleo/treering/isotope/africa/africa2016d13c-iwue.txt English https://www.ncdc.noaa.gov/paleo/study/20305 https://www1.ncdc.noaa.gov/pub/data/paleo/treering/isotope/africa/africa2016d13c-iwue.txt Tommy H.G. Wils, Iain Robertson, Stephan Woodborne, Grant Hall, Marcin Koprowski, Zewdu Eshetu2016Anthropogenic forcing increases the water use efficiency of African treesJournal of Quaternary Science314386-39010.1002/jqs.2865http://onlinelibrary.wiley.com/doi/10.1002/jqs.2865/abstract START YEAR: 1755 AD * END YEAR: 2006 AD 15.8667 -29.7167 39.5 12.6167