Conterminous United States Regional 555 Year Streamflow Reconstructions Ho, M.; Lall, U.; Sun, X.; Cook, E.R. Ho, M. Lall, U. Sun, X. Cook, E.R. Streamflow Reconstruction 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 (principal component,null,null,dimensionless,annual,climate reconstructions|tree ring,null,null,N,First PC of streamflow cluster 5 (California)) earth science/paleoclimate/climate reconstructions|tree ring (notes,null,null,null,null,climate reconstructions|tree ring,null,null,N,Region: 1=NDtoTX 2=Cornbelt 3=sMSRiv 4=GreatLakes 5=California 6=Intermountain 7=Northeast 8=PacificNW 9=Southeast) earth science/paleoclimate/climate reconstructions|tree ring (principal component,null,null,dimensionless,annual,climate reconstructions|tree ring,null,null,N,First PC of streamflow cluster 4 (Great Lakes)) earth science/paleoclimate/climate reconstructions|tree ring (principal component,null,null,dimensionless,annual,climate reconstructions|tree ring,null,null,N,First PC of streamflow cluster 6 (Intermountain)) earth science/paleoclimate/climate reconstructions|tree ring (principal component,null,null,dimensionless,annual,climate reconstructions|tree ring,null,null,N,First PC of streamflow cluster 3 (sMSRiv)) earth science/paleoclimate/climate reconstructions|tree ring (principal component,null,null,dimensionless,annual,climate reconstructions|tree ring,null,null,N,First PC of streamflow cluster 7 (Northeast)) earth science/paleoclimate/climate reconstructions|tree ring (principal component,null,null,dimensionless,annual,climate reconstructions|tree ring,null,null,N,First PC of streamflow cluster 9 (Southeast)) earth science/paleoclimate/climate reconstructions|tree ring (principal component,null,null,dimensionless,annual,climate reconstructions|tree ring,null,null,N,First PC of streamflow cluster 8 (PacificNW)) earth science/paleoclimate/climate reconstructions|tree ring (streamflow,null,calibration coefficient of determination,dimensionless,null,climate reconstructions|tree ring,null,null,N,adjusted r2) earth science/paleoclimate/climate reconstructions|tree ring (streamflow,null,verification coefficient of efficiency,dimensionless,null,climate reconstructions|tree ring,null,null,N,null) earth science/paleoclimate/climate reconstructions|tree ring (streamflow,null,verification reduction of error,dimensionless,null,climate reconstructions|tree ring,null,null,N,null) earth science/paleoclimate/climate reconstructions|tree ring (notes,null,null,null,null,climate reconstructions|tree ring,null,null,N,lambda (canonical correlation analysis regularization parameter)) earth science/paleoclimate/climate reconstructions|tree ring (principal component,null,null,dimensionless,annual,climate reconstructions|tree ring,null,null,N,First PC of streamflow cluster 1 (ND to TX)) earth science/paleoclimate/climate reconstructions|tree ring (principal component,null,null,dimensionless,annual,climate reconstructions|tree ring,null,null,N,First PC of streamflow cluster 2 (Cornbelt)) earth science/paleoclimate/reconstructions (Continental United States>LATITUDE >LONGITUDE ) The development of paleoclimate streamflow reconstructions in the conterminous United States (CONUS) has provided water resource managers with improved insights into multi-decadal and centennial scale variability that cannot be reliably detected using shorter instrumental records. Paleoclimate streamflow reconstructions have largely focused on individual catchments limiting the ability to quantify variability across the CONUS. The Living Blended Drought Atlas (LBDA), a spatially and temporally complete 555-year-long paleoclimate record of summer drought across the CONUS, provides an opportunity to reconstruct and characterize streamflow variability at a continental scale. We explore the validity of the first paleo reconstructions of streamflow that span the CONUS informed by the LBDA targeting a set of US Geological Survey streamflow sites. The reconstructions are skillful under cross validation across most of the country, but the variance explained is generally low. Spatial and temporal structures of streamflow variability are analyzed using hierarchical clustering, principal component analysis, and wavelet analyses. Nine spatially coherent clusters are identified. The reconstructions show signals of contemporary droughts such as the Dust Bowl (1930s) and 1950s droughts. Decadal-scale variability was detected in the late 1900s in the western US, however, similar modes of temporal variability were rarely present prior to the 1950s. The 20th century featured longer wet spells and shorter dry spells compared with the preceding 450 years. Streamflow in the Pacific Northwest and Northeast are negatively correlated with the central US suggesting the potential to mitigate some drought impacts by balancing economic activities and insurance pools across these regions during major droughts. STUDY NOTES: Annual regional streamflow reconstructions using regularized Canonical Correlation Analysis and a tree-ring based paleoclimate reconstruction of the Palmer Drought Severity Index. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Ho, M. Investigator : Lall, U. Investigator : Sun, X. Investigator : Cook, E.R. 2017-03-21 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/20435 https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/northamerica/usa/conus2017flow-stations-stats.txt https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/northamerica/usa/conus2017flow.txt https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/northamerica/usa/conus2017flow-stations-stats.txt https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/northamerica/usa/conus2017flow.txt English https://www.ncdc.noaa.gov/paleo/study/20435 https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/northamerica/usa/conus2017flow-stations-stats.txt https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/northamerica/usa/conus2017flow.txt Michelle Ho, Upmanu Lall, Xun Sun, Edward R. Cook2017Multiscale temporal variability and regional patterns in 555 years of conterminous U.S. streamflowWater Resources Research10.1002/2016WR019632http://onlinelibrary.wiley.com/doi/10.1002/2016WR019632/full START YEAR: 1451 AD * END YEAR: 2005 AD -124 24 -68 50