{"NOAAStudyId":"23656","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":"2018-02-28","dataPublisher":"NOAA","dataType":"TREE RING","dataTypeInformation":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data/datasets/tree-ring","difMetadataLink":"http://www1.ncdc.noaa.gov/pub/data/metadata/published/paleo/dif/xml/noaa-tree-23656.xml","doi":"https://doi.org/10.25921/txqr-er35","earliestYearBP":2218,"earliestYearCE":-268,"entryId":"noaa-tree-23656","funding":[],"investigators":"Routson, C.; Woodhouse, C.A.; Overpeck, J.T.","mostRecentYearBP":-59,"mostRecentYearCE":2009,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/23656","originalSource":null,"publication":[{"abstract":"A new tree‐ring record from living and remnant bristlecone pine (Pinus aristata) wood from the headwaters region of the Rio Grande River, Colorado is used in conjunction with other regional records to evaluate periods of unusually severe drought over the past two millennia (B.C. 268 to A.D. 2009). Our new record contains a multi‐century period of unusual dryness between 1 and 400 A.D., including an extreme drought during the 2nd century. Characterized by almost five decades of drought (below average ring width), we hypothesize this megadrought is equally, if not more severe than medieval period megadroughts in this region. Published paleoclimate time series help define the spatial extent, severity, and potential causes of the 2nd century megadrought. Furthermore, this early period of unusual dryness has intriguing similarities to later medieval period aridity. Our findings suggest we should anticipate similar severe drought conditions in an even warmer and drier future.","author":{"name":"Cody C. Routson, Connie A. Woodhouse, Jonathan T. Overpeck"},"citation":"Cody C. Routson, Connie A. Woodhouse, Jonathan T. Overpeck. 2011. Second century megadrought in the Rio Grande headwaters, Colorado: How unusual was medieval drought?. Geophysical Research Letters, 38(22), L22703. doi: 10.1029/2011GL050015","edition":"L22703","identifier":{"id":"10.1029/2011GL050015","type":"doi","url":"http://dx.doi.org/10.1029/2011GL050015"},"issue":"22","journal":"Geophysical Research Letters","pages":null,"pubRank":"1","pubYear":2011,"reportNumber":null,"title":"Second century megadrought in the Rio Grande headwaters, Colorado: How unusual was medieval drought?","type":"publication","volume":"38"}],"reconstruction":"N","scienceKeywords":["Pinus aristata Engelm.","Rocky Mountain bristlecone pine","PIAR"],"site":[{"NOAASiteId":"57610","geo":{"geoType":"Feature","geometry":{"coordinates":["37.437236","-106.631074"],"type":"POINT"},"properties":{"easternmostLongitude":"-106.631074","maxElevationMeters":"3560","minElevationMeters":"3560","northernmostLatitude":"37.437236","southernmostLatitude":"37.437236","westernmostLongitude":"-106.631074"}},"locationName":"Continent>North America>United States Of America>Colorado","mappable":"Y","paleoData":[{"NOAADataTableId":"35502","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>tree-ring>width>ring width"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/treering/measurements/correlation-stats/co656.txt","linkText":"co656.txt","urlDescription":"Correlation Stats","variables":[]},{"NOAAKeywords":["earth science>paleoclimate>tree-ring>width>ring width"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/treering/measurements/northamerica/usa/co656.rwl","linkText":"co656.rwl","urlDescription":"Raw Measurements","variables":[{"cvAdditionalInfo":null,"cvDataType":"TREE RING","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":"age_CE","cvUnit":"year Common Era","cvWhat":"age variable>age"},{"cvAdditionalInfo":"units are 0.01 mm if end-of-series marker is 999 and 0.001 mm if end-of-series marker is -9999","cvDataType":"TREE RING","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"millimeter","cvWhat":"physical property>length>total ring width"}]},{"NOAAKeywords":["earth science>paleoclimate>tree-ring>width>ring width"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/treering/measurements/northamerica/usa/co656-noaa.rwl","linkText":"co656-noaa.rwl","urlDescription":"Raw Measurements - NOAA Template File","variables":[]},{"NOAAKeywords":["earth science>paleoclimate>tree-ring>width>ring width"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/treering/chronologies/northamerica/usa/co656.crn","linkText":"co656.crn","urlDescription":"Chronology","variables":[{"cvAdditionalInfo":null,"cvDataType":"TREE RING","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":"age_CE","cvUnit":"year Common Era","cvWhat":"age variable>age"},{"cvAdditionalInfo":null,"cvDataType":"TREE RING","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":"numsamp","cvUnit":"count","cvWhat":"sampling metadata>number of samples"},{"cvAdditionalInfo":null,"cvDataType":"TREE RING","cvDetail":"composited","cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":"standard","cvSeasonality":null,"cvShortName":"trsgi","cvUnit":null,"cvWhat":"statistical variable>proxy composite>tree ring standardized growth index"}]},{"NOAAKeywords":["earth science>paleoclimate>tree-ring>width>ring width"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/treering/chronologies/northamerica/usa/co656a.crn","linkText":"co656a.crn","urlDescription":"Chronology","variables":[{"cvAdditionalInfo":null,"cvDataType":"TREE RING","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":"age_CE","cvUnit":"year Common Era","cvWhat":"age variable>age"},{"cvAdditionalInfo":null,"cvDataType":"TREE RING","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":"numsamp","cvUnit":"count","cvWhat":"sampling metadata>number of samples"},{"cvAdditionalInfo":null,"cvDataType":"TREE RING","cvDetail":"composited","cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":"ARSTAN","cvSeasonality":null,"cvShortName":"trsgi","cvUnit":null,"cvWhat":"statistical variable>proxy composite>tree ring standardized growth index"}]},{"NOAAKeywords":["earth science>paleoclimate>tree-ring>width>ring width"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/treering/chronologies/northamerica/usa/co656r.crn","linkText":"co656r.crn","urlDescription":"Chronology","variables":[{"cvAdditionalInfo":null,"cvDataType":"TREE RING","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":"age_CE","cvUnit":"year Common Era","cvWhat":"age variable>age"},{"cvAdditionalInfo":null,"cvDataType":"TREE RING","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":"numsamp","cvUnit":"count","cvWhat":"sampling metadata>number of samples"},{"cvAdditionalInfo":null,"cvDataType":"TREE RING","cvDetail":"composited","cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":"residual","cvSeasonality":null,"cvShortName":"trsgi","cvUnit":null,"cvWhat":"statistical variable>proxy composite>tree ring standardized growth index"}]},{"NOAAKeywords":["earth science>paleoclimate>tree-ring>width>ring width"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/treering/chronologies/northamerica/usa/co656-noaa.crn","linkText":"co656-noaa.crn","urlDescription":"Chronology - NOAA Template File","variables":[]},{"NOAAKeywords":["earth science>paleoclimate>tree-ring>width>ring width"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/treering/chronologies/northamerica/usa/co656a-noaa.crn","linkText":"co656a-noaa.crn","urlDescription":"Chronology - NOAA Template File","variables":[]},{"NOAAKeywords":["earth science>paleoclimate>tree-ring>width>ring width"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/treering/chronologies/northamerica/usa/co656r-noaa.crn","linkText":"co656r-noaa.crn","urlDescription":"Chronology - NOAA Template File","variables":[]}],"dataTableName":"CO656","dataTableNotes":null,"earliestYear":-268,"earliestYearBP":2218,"earliestYearCE":-268,"mostRecentYear":2009,"mostRecentYearBP":-59,"mostRecentYearCE":2009,"species":[{"commonName":["Rocky Mountain bristlecone pine"],"scientificName":"Pinus aristata Engelm.","speciesCode":"PIAR"}],"timeUnit":"AD"}],"siteName":"Summitville"}],"studyCode":"CO656","studyName":"Routson - Summitville - PIAR - ITRDB CO656","studyNotes":"NOAA Template Chronology file added 2019-07-05. NOAA Template Raw Measurements file added 2019-07-05.","version":"1.0","xmlId":"21822"}