{"NOAAStudyId":"14514","contactInfo":{"address":"325 Broadway, E/NE31","city":"Boulder","constraints":"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.","country":"USA","dataCenterUrl":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data","email":"paleo@noaa.gov","fax":"303-497-6513","longName":"National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce ","phone":"303-497-6280","postalCode":"80305-3328","shortName":"DOC/NOAA/NESDIS/NCEI","state":"CO","type":"CONTACT INFORMATION"},"contributionDate":"2013-05-20","dataPublisher":"NOAA","dataType":"PALEOLIMNOLOGY","dataTypeInformation":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data/datasets/lake","difMetadataLink":"http://www1.ncdc.noaa.gov/pub/data/metadata/published/paleo/dif/xml/noaa-lake-14514.xml","doi":null,"earliestYearBP":125000,"earliestYearCE":-123050,"entryId":"noaa-lake-14514","funding":[{"fundingAgency":"Natural Environment Research Council (NERC)","fundingGrant":null},{"fundingAgency":"Royal Society","fundingGrant":null}],"investigators":"Holmes, J.A.; Street-Perrott, F.A.","mostRecentYearBP":0,"mostRecentYearCE":1950,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/14514","originalSource":null,"publication":[{"abstract":"Ostracods preserved in late Quaternary sediments of Wallywash Great Pond, a fresh coastal lake in SW Jamaica, record temporal variations in the strontium-isotope composition of lake water. Oxygen-isotope and Sr/Ca ratios in ostracods reveal temporal variations in the lake's hydrology, related to effective precipitation, and in its salinity related to varying marine-saline groundwater input from changes in relative sea level. Evaluation of isotopic and trace-element data indicates that the stratigraphic variations in 87Sr/86Sr ratios during the late Quaternary are best explained by climatically-controlled hydrological changes. During wetter periods, the lake's Sr budget was dominated by springwater input with relatively low 87Sr/86Sr ratio, whereas during drier times reduced springflow, possibly coupled with input of more-radiogenic Sr from other sources, such as sea-spray aerosols and perhaps Saharan dust, led to an increase in the Sr-isotope ratio of the lake water. Despite proximity of the lake to the sea and evidence for slight intrusion of marine saline groundwater in the past, however, the extent of marine input appears to have had limited influence on the lake's Sr-isotope ratios. Whereas the 87Sr/86Sr ratios cannot be used as a palaeosalinity proxy in this particular lake, they do provide valuable information about the mechanisms underlying hydrological change. ","author":null,"citation":"Holmes, J.A., D.P.F. Darbyshire, and T.H.E. Heaton. 2007. \r\nPalaeohydrological significance of late Quaternary strontium isotope ratios in a tropical lake.\r\nChemical Geology, Vol. 236, Issues 3-4, pp. 281-290.\r\nDOI: 10.1016/j.chemgeo.2006.10.002","edition":null,"identifier":{"id":"10.1016/j.chemgeo.2006.10.002","type":"doi","url":"http://dx.doi.org/10.1016/j.chemgeo.2006.10.002"},"issue":null,"journal":"Chemical Geology","pages":null,"pubRank":"1","pubYear":2007,"reportNumber":null,"title":"Palaeohydrological significance of late Quaternary strontium isotope ratios in a tropical lake","type":"publication","volume":null}],"reconstruction":"N","scienceKeywords":["hydrology"],"site":[{"NOAASiteId":"54969","geo":{"geoType":"Feature","geometry":{"coordinates":["17.9733","-77.8083"],"type":"POINT"},"properties":{"easternmostLongitude":"-77.8083","maxElevationMeters":"7","minElevationMeters":"7","northernmostLatitude":"17.9733","southernmostLatitude":"17.9733","westernmostLongitude":"-77.8083"}},"locationName":"Ocean>Atlantic 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Jamaica, in order to infer changes of effective \nmoisture. Our study is based on the 9.23-metre-long core WGP2, which consists of pure \nmarls, organic marls and muds, organic mud and peat and earthy calcareous muds. We use the \nfacies changes, ostracod faunal assemblages, sediment geochemistry, ostracod shell chemistry \nand stable-isotope variations in order to infer changes in lake level, evaporative enrichment \nand effective moisture change. The chronology of the core is based on radiocarbon and \nuranium-series dates. The core covers the past ~125 ka BP and is reasonably well dated for the \nHolocene, although chronological uncertainties increase further back in time. Three major lake \nhighstands with slightly elevated salinity occurred during marine isotope stage 5, under \nelevated sea level and a humid climate. There is evidence of minor marine saline intrusion into \nthe lake during the earliest of these highstands. The lake dried out ~93.5 ka BP as sea level \nfell and the climate became drier. It refilled around 10.7 ka BP. Three separate highstands \nduring the Holocene were sustained by humid conditions and high relative sea level. Although \nthere were small increases in salinity during the Holocene when sea level was close to the \ndeepest part of the lake, significant saltwater intrusion appears to have been prevented by \nfreshwater discharge from inland. The long-term trends in lake level reflect both orbitally-\ninduced changes in insolation and eustatic sea level. Water-level fluctuations during the \nHolocene, however, reflect climatic changes on the millennial timescale rather than orbital \nforcing or sea-level change.  \n\nThe data from core WGP2 are presented against core depth, as in the original publications. \nChronological information are presented below and in file wallywash2007age.txt.\n\nIn addition, we present ancillary information (A1-A5) relating to the modern water chemistry and water \n isotope composition and modern ostracod fauna of Wallywash Great Pond and other lakes in \nWestern Jamaica: this information has been used to help us interpret the data from core WGP2.","version":"1.0","xmlId":"12517"}