noaa-lake-17919 Sacred Lake, Mt. Kenya 1800 Year Leaf Wax Deuterium and d13C Data Konecky, B.L.; Russell, J.M.; Huang, Y.; Vuille, M.; Cohen, L.; Street-Perrott, F.A. Sacred Lake, Mt. Kenya 1800 Year Leaf Wax Deuterium and d13C Data 2015-01-28 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/17919 Investigator B.L. Konecky Investigator J.M. Russell Investigator Y. Huang Investigator M. Vuille Investigator L. Cohen Investigator F.A. Street-Perrott earth science paleoclimate paleolimnology notes,null,null,null,null,paleolimnology,null,null,C,source earth science paleoclimate paleolimnology delta 13C,C28 n-alkanoic acid,null,per mil VPDB,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology depth,null,null,centimeter,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology delta 2H,C28 n-alkanoic acid,null,per mil VSMOW,null,paleolimnology,averaged,null,N,null earth science paleoclimate paleolimnology delta 2H,C28 n-alkanoic acid,one standard deviation,per mil VSMOW,null,paleolimnology,null,null,N,standard deviation of triplicate measurements earth science paleoclimate paleolimnology age,null,null,calendar year before present,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology delta 2H,C28 n-alkanoic acid,range,per mil VSMOW,null,paleolimnology,null,null,N,difference of duplicate measurements earth science paleoclimate paleolimnology delta 13C,C28 n-alkanoic acid,null,per mil VPDB,null,paleolimnology,corrected,null,N,corrected for Suess effect earth science paleoclimate paleolimnology carbon isotopes earth science paleoclimate paleolimnology hydrogen isotopes geoscientificInformation Monsoon hydrology 113 AD 1985 AD 1837 cal yr BP -35 cal yr BP Complete .0833 .0833 37.5333 37.5333 2350 2350 Continent Africa Eastern Africa Kenya Sacred Lake GDGT>LATITUDE .0833>LONGITUDE 37.5333 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Bronwen Konecky, James Russell, Yongsong Huang, Mathias Vuille, Lily Cohen, F. Alayne Street-Perrott 2014 Palaeogeography, Palaeoclimatology, Palaeoecology 396 17-25 10.1016/j.palaeo.2013.12.037 http://www.sciencedirect.com/science/article/pii/S0031018213005749 Yongsong Huang, F. Alayne Street-Perrott, R. Alan Perrott, Pierre Metzger, Geoffrey Eglinton 2015 Geochimica et Cosmochimica Acta 63 9 1383-1404 10.1016/S0016-7037(00)00445-2 http://www.sciencedirect.com/science/article/pii/S0016703700004452

Glacial and early Holocene-age sediments from lakes on Mt. Kenya have documented strong responses of montane hydrology, ecosystems, and carbon cycling to past changes in temperature and atmospheric CO2 concentrations. However, little is known about climate and ecosystem variations on Mt. Kenya during the Common Era (the past ~2000 years), despite mounting evidence for significant climate changes in the East African lowlands during the past millennium and recent observations of alpine glacier retreat in the East African highlands. We present a new, high-resolution record of the hydrogen and carbon isotopic composition of terrestrial plant wax compounds (dDwax, d13Cwax) preserved in the sediments of Sacred Lake from 200C.E. to the end of the 20th century. We find that Mt. Kenya's climate was highly variable during the past 1800 years. Droughts at Sacred Lake around ~200C.E., 700C.E., and 1100C.E. align with similar droughts in central Kenya and Uganda/Congo, indicating that failures of both the Indian and Atlantic monsoons caused widespread drought throughout equatorial East Africa during the early Common Era. In contrast, dry and wet periods at Sacred Lake during the past 500 years show meridional and zonal contrasts with other sites in East Africa, suggesting strong spatial heterogeneity, possibly due to independent waxing and waning of the Atlantic and Indian monsoons. Pronounced drying after ~1870C.E. suggests that the current dry phase observed at Sacred Lake may have begun prior to the 20th century, around the time when the retreat of Mt. Kenya's glaciers was first observed by European explorers. Mt. Kenya's vegetation responded strongly to these recent climate changes, highlighting the particular sensitivity of tropical montane climate and ecosystems to regional and global climate patterns, and underscoring the critical need to understand potential impacts of future climate change scenarios on this highly sensitive region. STUDY NOTES: Leaf wax stable isotope (dD and d13C) from sediments collected in Sacred Lake, Mt. Kenya, covering the past 1800 years. Dates on samples from Huang et al., 1999 have been updated to the age model of Konecky et al., 2014.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/sacred2014d13c.txt Data File; Sacred Lake Leaf Wax d13C Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/sacred2014dd.txt Data File; Sacred Lake Leaf Wax Deuterium Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11