{"NOAAStudyId":"9953","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":"2010-08-09","dataPublisher":"NOAA","dataType":"INSECT","dataTypeInformation":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data/datasets/insect","difMetadataLink":"http://www1.ncdc.noaa.gov/pub/data/metadata/published/paleo/dif/xml/noaa-insect-9953.xml","doi":null,"earliestYearBP":6007,"earliestYearCE":-4057,"entryId":"noaa-insect-9953","funding":[{"fundingAgency":"US National Science Foundation","fundingGrant":"ARC 0455102 and ARC 0612366 "}],"investigators":"Clegg, B.F.; Clarke, G.H.; Chipman, M.L.; Chou, M.; Walker, I.R.; Tinner, W.; Hu, F.S.","mostRecentYearBP":-20,"mostRecentYearCE":1970,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/9953","originalSource":null,"publication":[{"abstract":"Despite their importance for evaluating anthropogenic climatic \nchange, quantitative temperature reconstructions of the Holocene \nremain scarce from northern high latitude regions. We conducted \nhigh-resolution midge analysis on the sediments of the past 6000 \nyears from a lake in south-central Alaska. Results were used to \nestimate summer temperature (TJuly) variations on the basis of a \nmidge temperature transfer function. The TJuly estimates from the \nnear-surface samples are broadly consistent with instrumental and \ntreering-based temperature data. Together with previous studies, \nthese results suggest that midge assemblages are more sensitive \nto small shifts in summer temperature (~0.5°C) than indicated by \nthe typical error range of midge temperature transfer functions \n(~1.5°C). A piecewise linear regression analysis identifies a \nsignificant change point at ca. 4000 years before present \n(cal. BP) in our TJuly record, with a decreasing trend after \nthis point. Episodic TJuly peaks (~14.5°C) between 5500 and 4200 \ncal. BP and the subsequent climatic cooling may have resulted \nfrom decreasing summer insolation associated with the \nprecessional cycle. Centennial-scale climatic cooling of up to \n1°C occurred around 4000, 3300, 1800-1300, 600, and 250 cal. BP. \nThese cooling events were more pronounced and lasted longer \nduring the last two millennia than between 2000-4000 cal. BP. \nSome of these events have counterparts in climatic records from \nelsewhere in Alaska and other regions of the Northern Hemisphere, \nincluding several roughly synchronous with known grand minima \nin solar irradiance. Over the past 2000 years, our TJuly record \ndisplays patterns similar to those inferred from a wide variety \nof temperature proxy indicators at other sites in Alaska, \nincluding climatic fluctuations coeval with the Little Ice Age \n(~245 cal. BP), the Medieval Climate Anomaly (~1000 cal. BP), \nand the First Millennial Cooling (~1400 cal. BP). To our knowledge, \nthis study offers the first high-resolution, quantitative record \nof summer-temperature variation that spans longer than the past \n2000 years from the high-latitude regions around the North Pacific. \n\n","author":null,"citation":"Clegg, B.F., G.H. Clarke, M.L. Chipman, M. Chou, I.R. Walker, \nW. Tinner, and F.S. Hu. 2010. \nSix Millennia of Summer Temperature Variation Based on Midge \nAnalysis of Lake Sediments from Alaska. \nQuaternary Science Reviews., Vol. 29, Issues 23-24, November 2010, pp. 3308-3316.  DOI: 10.1016/j.quascirev.2010.08.001","edition":null,"identifier":{"id":"10.1016/j.quascirev.2010.08.001","type":"doi","url":"http://dx.doi.org/10.1016/j.quascirev.2010.08.001"},"issue":null,"journal":"Quaternary Science Reviews","pages":null,"pubRank":"1","pubYear":2010,"reportNumber":null,"title":"Six Millennia of Summer Temperature Variation Based on Midge  Analysis of Lake Sediments from Alaska","type":"publication","volume":null}],"reconstruction":"Y","scienceKeywords":["Air Temperature Reconstruction","Arctic","thermal maximum"],"site":[{"NOAASiteId":"31566","geo":{"geoType":"Feature","geometry":{"coordinates":["61.3742","-143.5988"],"type":"POINT"},"properties":{"easternmostLongitude":"-143.5988","maxElevationMeters":"437","minElevationMeters":"437","northernmostLatitude":"61.3742","southernmostLatitude":"61.3742","westernmostLongitude":"-143.5988"}},"locationName":"Continent>North America>United States Of 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