{"NOAAStudyId":"12443","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":"2012-02-04","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-12443.xml","doi":null,"earliestYearBP":13506,"earliestYearCE":-11556,"entryId":"noaa-insect-12443","funding":[{"fundingAgency":"US National Science Foundation","fundingGrant":"ARC 0455102, ARC 0612366"}],"investigators":"Clegg, B.F.; Kelly, R.F.; Clarke, G.H.; Walker, I.R.; Hu, F.S.","mostRecentYearBP":-54,"mostRecentYearCE":2004,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/12443","originalSource":null,"publication":[{"abstract":"Regional climate responses to large-scale forcings, such as precessional \r\nchanges in solar irradiation and increases in anthropogenic greenhouse \r\ngases, may be nonlinear as a result of complex interactions among earth \r\nsystem components. Such nonlinear behaviors constitute a major source \r\nof climate \"surprises\" with important socioeconomic and ecological \r\nimplications. Paleorecords are key for elucidating patterns \r\nand mechanisms of nonlinear responses to radiative forcing, \r\nbut their utility has been greatly limited by the paucity of \r\nquantitative temperature reconstructions. Here we present Holocene \r\nJuly temperature reconstructions on the basis of midge analysis \r\nof sediment cores from three Alaskan lakes. Results show that summer \r\ntemperatures during 10,000-5,500 calibrated years (cal) B.P. were \r\ngenerally lower than modern and that peak summer temperatures around \r\n5,000 were followed by a decreasing trend toward the present. \r\nThese patterns stand in stark contrast with the trend of precessional \r\ninsolation, which decreased by ~10% from 10,000 y ago to the present. \r\nCool summers before 5,500 cal B.P. coincided with extensive summer ice \r\ncover in the western Arctic Ocean, persistence of a positive phase \r\nof the Arctic Oscillation, predominantly La Niña-like conditions, \r\nand variation in the position of the Alaskan treeline. These results \r\nillustrate nonlinear responses of summer temperatures to Holocene \r\ninsolation radiative forcing in the Alaskan sub-Arctic, possibly \r\nbecause of state changes in the Arctic Oscillation and El Niño-Southern \r\nOscillation and associated land-atmosphere-ocean feedbacks. \r\n\r\n","author":null,"citation":"Clegg, B.F., R. Kelly, G.H. Clarke, I.R. Walker, and F.S. Hu. 2011. \r\nNonlinear response of summer temperature to Holocene insolation \r\nforcing in Alaska. \r\nProceedings of the National Academy of Sciences (PNAS), \r\nVol. 108, No. 48, pp. 19299-19304, 29 November 2011. \r\ndoi:10.1073/pnas.1110913108","edition":null,"identifier":{"id":"10.1073/pnas.1110913108","type":"doi","url":"http://dx.doi.org/10.1073/pnas.1110913108"},"issue":null,"journal":"Proceedings of the National Academy of Sciences","pages":null,"pubRank":"1","pubYear":2011,"reportNumber":null,"title":"Nonlinear response of summer temperature to Holocene insolation  forcing in Alaska","type":"publication","volume":null}],"reconstruction":"Y","scienceKeywords":["Air Temperature Reconstruction","Milankovitch","Arctic Oscillation 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