noaa-recon-24910 North American Hydroclimate Synthesis (NAHS) from multi-proxy hydroclimate records over the Common Era Rodysill, J.R.; Anderson, L.; Cronin, T.M.; Jones, M.C.; Thompson, R.S.; Wahl, D.B.; Willard, D.A.; Addison, J.A.; Alder, J.R.; Anderson, K.H.; Anderson, L.; Barron, J.A.; Bernhardt, C.E.; Hostetler, S.W.; Kehrwald, N.M.; Khan, N.S.; Richey, J.N.; Starratt, S.W.; Strickland, L.E.; Toomey, M.R.; Treat, C.C.; Wingard, G.L. North American Hydroclimate Synthesis (NAHS) from multi-proxy hydroclimate records over the Common Era 2018-08-14 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/24910 Investigator J.R. Rodysill Investigator L. Anderson Investigator T.M. Cronin Investigator M.C. Jones Investigator R.S. Thompson Investigator D.B. Wahl Investigator D.A. Willard Investigator J.A. Addison Investigator J.R. Alder Investigator K.H. Anderson Investigator L. Anderson Investigator J.A. Barron Investigator C.E. Bernhardt Investigator S.W. Hostetler Investigator N.M. Kehrwald Investigator N.S. Khan Investigator J.N. Richey Investigator S.W. Starratt Investigator L.E. Strickland Investigator M.R. Toomey Investigator C.C. Treat Investigator G.L. Wingard earth science paleoclimate climate reconstructions age at sample end,null,null,year Common Era,null,climate reconstructions,null,null,N,end year of 100-year bin earth science paleoclimate climate reconstructions age at sample end,null,null,year Common Era,null,climate reconstructions,null,null,N,end year of 200-year bin earth science paleoclimate climate reconstructions moisture index,multiple proxies,null,dimensionless,null,climate reconstructions,null,null,N,fraction representing the difference between the number of chronologies indicating wet anomalies and the number of chronologies indicating dry anomalies relative to the total number of chronologies exported from Bacon in a given 100-year window; negative: more chronologies indicate drier than average than wetter than average; positive: more chronologies indicate wetter than average than drier than average; Data used for Supplementary Figures 1-20; Methods Section 3.5 earth science paleoclimate climate reconstructions age at sample start,null,null,year Common Era,null,climate reconstructions,null,null,N,start year of 200-year bin earth science paleoclimate climate reconstructions age at sample start,null,null,year Common Era,null,climate reconstructions,null,null,N,start year of 100-year bin earth science paleoclimate climate reconstructions moisture index,multiple proxies,null,dimensionless,null,climate reconstructions,null,null,N,fraction representing the difference between the number of chronologies indicating wet anomalies and the number of chronologies indicating dry anomalies relative to the total number of chronologies exported from Bacon in a given 200-year window; negative: more chronologies indicate drier than average than wetter than average; positive: more chronologies indicate wetter than average than drier than average; Methods Section 3.5 earth science paleoclimate reconstructions precipitation geoscientificInformation -100 AD 1900 AD 2050 cal yr BP 50 cal yr BP Complete 17.4 74.89164 -159.4316 -63.5392 Continent North America North America NAHS>LATITUDE >LONGITUDE 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 Rodysill, Jessica R.; Anderson, Lesleigh; Cronin, Thomas M.; Jones, Miriam C.; Thompson, Robert S.; Wahl, David B.; Willard, Debra A.; Addison, Jason A.; Alder, Jay R.; Anderson, Katherine H.; Anderson, Lysanna; Barron, John A.; Bernhardt, Christopher E.; Hostetler, Steven W.; Kehrwald, Natalie M.; Khan, Nicole S.; Richey, Julie N.; Starratt, Scott W.; Strickland, Laura E.; Toomey, Michael R.; Treat, Claire C.; Wingard, G. Lynn 2018 Global and Planetary Change 162 175-198 10.1016/j.gloplacha.2017.12.025 www.sciencedirect.com/science/article/pii/S0921818117304174

This study presents a synthesis of century-scale hydroclimate variations in North America for the Common Era (last 2000 years) using new age models of previously published multiple proxy-based paleoclimate data. This North American Hydroclimate Synthesis (NAHS) examines regional hydroclimate patterns and related environmental indicators, including vegetation, lake water elevation, stream flow and runoff, cave drip rates, biological productivity, assemblages of living organisms, and salinity. Centennial-scale hydroclimate anomalies are obtained by iteratively sampling the proxy data on each of thousands of age model realizations and determining the fractions of possible time series indicating that the century-smoothed data was anomalously wet or dry relative to the 100 BCE to 1900 CE mean. Results suggest regionally asynchronous wet and dry periods over multidecadal to centennial timescales and frequent periods of extended regional drought. Most sites indicate drying during previously documented multicentennial periods of warmer Northern Hemisphere temperatures, particularly in the western U.S., central U.S., and Canada. Two widespread droughts were documented by the NAHS: from 50 BCE to 450 CE and from 800 to 1100 CE. Major hydroclimate reorganizations occurred out of sync with Northern Hemisphere temperature variations and widespread wet and dry anomalies occurred during both warm and cool periods. We present a broad assessment of paleoclimate relationships that highlights the potential influences of internal variability and external forcing and supports a prominent role for Pacific and Atlantic Ocean dynamics on century-scale continental hydroclimate. STUDY NOTES: North American multi-proxy hydroclimate records are synthesized with new chronologies. Hydroclimate reconstructions document clear regional trends during the Common Era. Regionally asynchronous spatial variability occurred at centennial timescales. Widespread North American drought coincided with warm N. Hemisphere temperatures. Wet and dry climates occurred during both warm and cool climates. The data used for the assemblage-based hydroclimate interpretation can be found at the Original_Source_Data_URL or by contacting the authors of the associated publication listed in the RecordsUsed_Metadata file. Provided Keywords: precipitation, ground water, lake level, salinity, vegetation, lake salinity

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/reconstructions/rodysill2018/rodysill2018-RecordsUsed_Metadata.txt NOAA Synthesis Template File; Metadata for Records Used in Study GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/reconstructions/rodysill2018/rodysill2018-fig12.txt NOAA Template File; 200yr bin fractions of wet or dry anomalies used in Figure 12 GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/reconstructions/rodysill2018/rodysill2018-hydro_interp.txt NOAA Template File; Assemblage-based hydroclimate interpretation data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/reconstructions/rodysill2018/rodysill2018-2kslope.txt NOAA Template File; 2000yr moisture trend Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/reconstructions/rodysill2018/rodysill2018-data.txt NOAA Template File; Raw data from source collections GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/reconstructions/rodysill2018/rodysill2018-bacon.txt NOAA Template File; Bacon parameters by data source GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/reconstructions/rodysill2018/rodysill2018-100bin.txt NOAA Template File; 100yr bin time series and hydroclimate interpretation data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/reconstructions/rodysill2018/rodysill2018-100fract.txt NOAA Template File; 100yr bin fractions of possible time series indicating wet or dry anomalies relative to 2ka trend GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/reconstructions/rodysill2018/rodysill2018-200fract.txt NOAA Template File; 200yr bin fractions of possible time series indicating wet or dry anomalies relative to 2ka trend GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/reconstructions/rodysill2018/rodysill2018-fig13.txt NOAA Template File; 200yr bin fractions of wet or dry anomalies used in Figure 13 USA/NOAA DIF Version 9.8.4 2019-05-08 2019-05-08