noaa-lake-25550 Lake Nyamogusingiri, Uganda 800 Year Multiproxy Lake Sediment Data Mills, K.; Vane, C.H.; Lopes dos Santos, R.A.; Ssemmanda, I.; Leng, M.J.; Ryves, D.B. Lake Nyamogusingiri, Uganda 800 Year Multiproxy Lake Sediment Data 2018-11-15 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/25550 Investigator K. Mills Investigator C.H. Vane Investigator R.A. Lopes dos Santos Investigator I. Ssemmanda Investigator M.J. Leng Investigator D.B. Ryves earth science paleoclimate paleolimnology geochemistry geoscientificInformation 1144 AD 2007 AD 806 cal yr BP -57 cal yr BP Complete -.284583 -.284583 30.012972 30.012972 984 984 Continent Africa Eastern Africa Uganda Lake Nyamogusingiri>LATITUDE -.284583>LONGITUDE 30.012972 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 Keely Mills, Christopher H. Vane, Raquel A. Lopes dos Santos, Immaculate Ssemmanda, Melanie J. Leng, David B. Ryves 2018 Quaternary Science Reviews 10.1016/j.quatscirev.2018.09.038 https://www.sciencedirect.com/science/article/pii/S0277379118300970

The exploitation of lakes has led to large-scale contemporary impacts on freshwater systems, largely in response to catchment clearance. Such clearance is causing changes to carbon dynamics in tropical lakes which may have significance for wider carbon budgets, depending on the changes in carbon sequestration and mineralisation driven by changing roles of terrestrial and aquatic carbon in lakes over time. Despite increasing awareness of the pivotal role of carbon source in carbon dynamics, discriminating the source of carbon from a palaeolimnological record is rarely undertaken. Here we use novel geochemical techniques (brGDGTs, n-alkanes, Rock-Eval pyrolysis), paired with traditional analyses (diatoms, pollen), to elucidate changing sources of carbon through time and ecosystem response. Environmental changes at Lake Nyamogusingiri can be divided into three phases: Phase I (CE 1150-1275), a shallow and productive lake, where a diverse terrestrial environment is, initially, the main carbon source, before switching to an aquatic source; Phase II (CE 1275-1900), variable lake levels (generally in decline) with increasing productivity, and carbon is autochthonous in source; Phase III (CE 1900-2007), lake level declines, and the carbon is of a mixed source, though the terrestrially derived carbon is from a less diverse source. The organic geochemical analyses provide a wealth of data regarding the complexity of aquatic response to catchment and with-in lake changes. These data demonstrate that small, tropical lake systems have the potential to bury high quantities of carbon, which has implications for the disruption of local biogeochemical cycles (C, P, N, and Si) both in the past, and the future as human and climate pressures increase. STUDY NOTES: Geochemical, isotope, and physical properties data plus pollen data from sediments collected in Lake Nyamogusingiri, Uganda, for the past 800 years.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/nyamogusingiri2018.txt NOAA Template File; Lake Nyamogusingiri Sediment Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11