{"NOAAStudyId":"16456","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":"1994-07-01","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-16456.xml","doi":null,"earliestYearBP":310,"earliestYearCE":1640,"entryId":"noaa-recon-16456","funding":[],"investigators":"Cleaveland, M.K.; Duvick, D.N.","mostRecentYearBP":-32,"mostRecentYearCE":1982,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/16456","originalSource":null,"publication":[{"abstract":"Tree ring indices from an expanded network of 17 white oak (Quercus alba) sites in eastern and central Iowa were used to reconstruct state average July Palmer hydrological drought index (PHDI), annual precipitation (previous August to current July), and other climate variables for 1640-1982. We removed nonclimatic variance trends caused by changing sample size and senescent growth. July PHDI correlated better with tree growth than annual precipitation. Occurrence of prolonged droughts throughout the reconstruction suggests that decades like the 1930s occur about twice per century in Iowa. Iowa climate is correlated with the Southern Oscillation Index (SOI) from June in the year of El Nino onset (Yr0) through the next February (Yr+1), with negative SOI (El Nino) associated with wetter conditions. When the June (Yr0) to February (Yr+1) average SOI reaches extremes >= + 1.0 or <=-1.0, it correlates significantly with observed and reconstructed July PHDI (r = -0.37 and -0.56, respectively). Climate during solar cycles centered on sunspot minima alternates between wet and dry regimes that differ by an average of 1.21 units of observed July PHDI and 46.7 mm of annual precipitation for 1877-1982. The solar relationship has been stable since 1640. Combining solar and SOI influences in forecasts may improve prediction of Iowa climate.","author":{"name":"M.K. Cleaveland and D.N. Duvick"},"citation":"M.K. Cleaveland and D.N. Duvick. 1992. Iowa climate reconstructed from tree rings, 1640-1982. Water Resources Research, 28(10), 2607-2615. doi: 10.1029/92WR01562","edition":null,"identifier":{"id":"10.1029/92WR01562","type":"doi","url":"http://dx.doi.org/10.1029/92WR01562"},"issue":"10","journal":"Water Resources Research","pages":"2607-2615","pubRank":"1","pubYear":1992,"reportNumber":null,"title":"Iowa climate reconstructed from tree rings, 1640-1982","type":"publication","volume":"28"}],"reconstruction":"Y","scienceKeywords":["Palmer Drought Index Reconstruction","Precipitation Reconstruction","drought"],"site":[{"NOAASiteId":"55898","geo":{"geoType":"Feature","geometry":{"coordinates":["41","43.5","-97","-90.5"],"type":"POLYGON"},"properties":{"easternmostLongitude":"-90.5","maxElevationMeters":null,"minElevationMeters":null,"northernmostLatitude":"43.5","southernmostLatitude":"41","westernmostLongitude":"-97"}},"locationName":"Continent>North America>United States Of America>Iowa","mappable":"N","paleoData":[{"NOAADataTableId":"26588","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>reconstructions>precipitation","earth science>paleoclimate>reconstructions>ground water"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/southusa/iowa.recon","linkText":"Iowa PDSI, PHDI, and Precipitation Reconstructions","urlDescription":"Data File","variables":[{"cvAdditionalInfo":null,"cvDataType":"CLIMATE RECONSTRUCTIONS|TREE RING","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":"1-month period>Jul","cvShortName":null,"cvUnit":"dimensionless","cvWhat":"earth system variable>hydroclimatic variable>hydroclimate index>Palmer Drought Severity Index"},{"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":"1-month period>Jun","cvShortName":null,"cvUnit":"dimensionless","cvWhat":"earth system variable>hydroclimatic variable>hydroclimate index>Palmer Drought Severity Index"},{"cvAdditionalInfo":null,"cvDataType":"CLIMATE RECONSTRUCTIONS|TREE RING","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":"1-month period>Jun","cvShortName":null,"cvUnit":"dimensionless","cvWhat":"earth system variable>hydroclimatic variable>hydroclimate index>Palmer Hydrologic Drought Index"},{"cvAdditionalInfo":null,"cvDataType":"CLIMATE RECONSTRUCTIONS|TREE RING","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":"1-month period>Jul","cvShortName":null,"cvUnit":"dimensionless","cvWhat":"earth system variable>hydroclimatic variable>hydroclimate index>Palmer Hydrologic Drought Index"},{"cvAdditionalInfo":"state of iowa","cvDataType":"CLIMATE RECONSTRUCTIONS|TREE RING","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":"annual>Aug-Jul","cvShortName":null,"cvUnit":"inch","cvWhat":"earth system variable>hydroclimatic variable>hydroclimate rate>precipitation"},{"cvAdditionalInfo":"Farmersburg","cvDataType":"CLIMATE RECONSTRUCTIONS|TREE RING","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":"annual>Aug-Jul","cvShortName":null,"cvUnit":"inch","cvWhat":"earth system variable>hydroclimatic variable>hydroclimate rate>precipitation"}]}],"dataTableName":"IowaPDSI","dataTableNotes":null,"earliestYear":1640,"earliestYearBP":310,"earliestYearCE":1640,"mostRecentYear":1982,"mostRecentYearBP":-32,"mostRecentYearCE":1982,"species":[],"timeUnit":"AD"}],"siteName":"Iowa"}],"studyCode":null,"studyName":"Iowa 340 Year Drought and Precipitation Reconstructions","studyNotes":"Reconstructed drought indices (PDSI, PHDI) and precipitation for the state of Iowa for the past 340 years, derived from tree-ring data.","version":"1.0","xmlId":"14182"}