noaa-recon-6219 White River, Arkansas 963-Year Streamflow Reconstruction Cleaveland, M.K. White River, Arkansas 963-Year Streamflow Reconstruction 2004-03-01 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/6219 Investigator M.K. Cleaveland earth science paleoclimate climate reconstructions|tree ring age,null,null,year Common Era,null,climate reconstructions|tree ring,null,null,N,null earth science paleoclimate climate reconstructions|tree ring streamflow,ring width,null,cubic meter per second,Jun-Aug,climate reconstructions|tree ring,null,regression analysis,N,x1e3 units; simple linear regression earth science paleoclimate instrumental streamflow,null,null,cubic meter per second,Jun-Aug,instrumental,null,null,N,x1000 m3/s earth science paleoclimate climate reconstructions|tree ring streamflow,ring width,null,cubic meter per second,Jun-Aug,climate reconstructions|tree ring,smoothed,regression analysis,N,x1e3 units; variance reduced over part of record; calibration data set: local instrumental data; simple linear regression earth science paleoclimate reconstructions streamflow geoscientificInformation Streamflow Reconstruction hydrology 1023 AD 1985 AD 927 cal yr BP -35 cal yr BP Complete 34.686 34.686 -91.3154 -91.3154 53 53 Continent North America United States Of America Arkansas Clarendon>LATITUDE 34.686>LONGITUDE -91.3154 None 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. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII M. K. Cleaveland 2000 The Holocene 10 11 33-41 10.1191/095968300666157027 http://hol.sagepub.com/content/10/1/33.abstract

An average of three baldcypress (Taxodium distichum) ring-width chronologies was used to reconstruct total summer (JJA) mean daily flow of the White River at Clarendon, Arkansas, for years 1023-1985. A quadratic transformation of the tree-ring data accounted for 68% (R2 adjusted for degrees of freedom lost) when regressed against total summer flow 1931-1985. The distribution of the quadratic reconstruction matched the gauged distribution much better than a simple linear model which only accounted for 62% of the variance. The model was validated by comparing regression estimates against independent data. Years with summer flow below the 25th percentile occur nonrandomly, i.e., they tend to cluster, in both the reconstructed and gauged data. Hydrologic regimes have apparently varied considerably in the past on annual to century time-scales, with extended dry and wet periods that exceeded anything in the modern record. The frequency of both wet and dry extremes has varied considerably over the last millennium. The eleventh through thirteenth centuries were not analysed due to reduced replication, but the well-replicated fourteenth and twentieth centuries both have large numbers of extremes. The twentieth century appears to have more extreme low flows than the previous centuries and also to have a large number of high flows. The practical consequences for society of variation in extremes and persistence of low flows may be considerable. Climatic change or anthropogenic changes to the watershed (e.g., widespread upland clearing for agriculture and logging of bottomland forests) may be responsible for the change in hydrologic regime during the twentieth century. STUDY NOTES: Reconstructed June/July/August streamflow, White River, AR (cubic meter/second, divided by 1000)

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/southusa/whiteriver_flow.txt Data File; White River Flow Reconstruction USA/NOAA DIF Version 9.8.4 2019-05-29 2019-05-29