{"NOAAStudyId":"12424","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":"2012-01-28","dataPublisher":"NOAA","dataType":"CLIMATE RECONSTRUCTIONS","dataTypeInformation":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data/datasets/climate-reconstruction","difMetadataLink":"http://www1.ncdc.noaa.gov/pub/data/metadata/published/paleo/dif/xml/noaa-recon-12424.xml","doi":null,"earliestYearBP":1000,"earliestYearCE":950,"entryId":"noaa-recon-12424","funding":[{"fundingAgency":"US National Science Foundation","fundingGrant":"0925114"},{"fundingAgency":"US NASA","fundingGrant":null}],"investigators":"Maxwell, R.S.; Hessl, A.E.; Cook, E.R.; Pederson, N.","mostRecentYearBP":-51,"mostRecentYearCE":2001,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/12424","originalSource":null,"publication":[{"abstract":"Mean May-September Potomac River streamflow was reconstructed \r\nfrom 950-2001 using a network of tree ring chronologies (n = 27) \r\nrepresenting multiple species. We chose a nested principal \r\ncomponents reconstruction method to maximize use of available \r\nchronologies backward in time. Explained variance during \r\nthe period of calibration ranged from 20% to 53% depending on \r\nthe number and species of chronologies available in each 25 year \r\ntime step. The model was verified by two goodness of fit tests, \r\nthe coefficient of efficiency (CE) and the reduction of error \r\nstatistic (RE). The RE and CE never fell below zero, suggesting \r\nthe model had explanatory power over the entire period of \r\nreconstruction. Beta weights indicated a loss of explained \r\nvariance during the 1550-1700 period that we hypothesize \r\nwas caused by the reduction in total number of predictor \r\nchronologies and loss of important predictor species. \r\nThus, the reconstruction is strongest from 1700-2001. \r\nFrequency, intensity, and duration of drought and pluvial \r\nevents were examined to aid water resource managers. \r\nWe found that the instrumental period did not represent \r\nadequately the full range of annual to multidecadal variability \r\npresent in the reconstruction. Our reconstruction of mean \r\nMay-September Potomac River streamflow was a significant \r\nimprovement over the Cook and Jacoby (1983) reconstruction \r\nbecause it expanded the seasonal window, lengthened the record \r\nby 780 years, and better replicated the mean and variance \r\nof the instrumental record. By capitalizing on variable \r\nphenologies and tree growth responses to climate, multispecies \r\nreconstructions may provide significantly more information \r\nabout past hydroclimate, especially in regions with low aridity \r\nand high tree species diversity. \r\n","author":null,"citation":"Maxwell, R.S., A.E. Hessl, E.R. Cook, and N. Pederson. 2011. \r\nA multispecies tree ring reconstruction of Potomac River \r\nstreamflow (950-2001). \r\nWater Resources Research, Vol. 47, W05512, \r\ndoi:10.1029/2010WR010019.","edition":null,"identifier":{"id":"10.1029/2010WR010019","type":"doi","url":"http://dx.doi.org/10.1029/2010WR010019"},"issue":null,"journal":"Water Resources Research","pages":null,"pubRank":"1","pubYear":2011,"reportNumber":null,"title":"A multispecies tree ring reconstruction of Potomac River  streamflow (950-2001)","type":"publication","volume":null}],"reconstruction":"Y","scienceKeywords":["hydrology","Streamflow Reconstruction"],"site":[{"NOAASiteId":"52618","geo":{"geoType":"Feature","geometry":{"coordinates":["39.2736","-77.5431"],"type":"POINT"},"properties":{"easternmostLongitude":"-77.5431","maxElevationMeters":null,"minElevationMeters":null,"northernmostLatitude":"39.2736","southernmostLatitude":"39.2736","westernmostLongitude":"-77.5431"}},"locationName":"Continent>North America>United States Of America>Maryland","mappable":"Y","paleoData":[{"NOAADataTableId":"20777","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>reconstructions>streamflow"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/northamerica/usa/potomac2011flow.txt","linkText":"potomac2011flow.txt","urlDescription":"Data","variables":[{"cvAdditionalInfo":null,"cvDataType":"CLIMATE RECONSTRUCTIONS|TREE RING","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"year Common Era","cvWhat":"age variable>age"},{"cvAdditionalInfo":null,"cvDataType":"CLIMATE RECONSTRUCTIONS|TREE RING","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":"5-month period>May-Sep","cvShortName":null,"cvUnit":"cubic meter per second","cvWhat":"earth system variable>hydroclimatic variable>hydroclimate rate>streamflow"},{"cvAdditionalInfo":null,"cvDataType":"INSTRUMENTAL","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":"5-month period>May-Sep","cvShortName":null,"cvUnit":"cubic meter per second","cvWhat":"earth system variable>hydroclimatic variable>hydroclimate rate>streamflow"}]},{"NOAAKeywords":["earth science>paleoclimate>reconstructions>streamflow"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/northamerica/usa/potomac2011flow.xls","linkText":"potomac2011flow.xls","urlDescription":"Data","variables":[]}],"dataTableName":"Potomac2011","dataTableNotes":null,"earliestYear":950,"earliestYearBP":1000,"earliestYearCE":950,"mostRecentYear":2001,"mostRecentYearBP":-51,"mostRecentYearCE":2001,"species":[],"timeUnit":"AD"}],"siteName":"Point of Rocks"}],"studyCode":null,"studyName":"Potomac River 1000 Year May-September Streamflow Reconstruction ","studyNotes":"Reconstruction of May through September Potomac River streamflow \nfor 950-2001 AD at the Point of Rocks, Maryland USGS streamflow gauge. \nThe streamflow reconstruction is based on 27 tree ring chronologies \nrepresenting multiple species from locations in the Appalachian \nMountains and east to the Atlantic Coast in Maryland, Pennsylvania, \nWest Virginia, and Virginia.  Some of the tree ring chronologies \nare available in the International Tree-Ring Data Bank: \nhttp://www.ncdc.noaa.gov/paleo/treering.html \n","version":"1.0","xmlId":"10467"}