# North American Hydroclimate Synthesis (NAHS) from multi-proxy hydroclimate records over the Common Era #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # Template Version 3.0 # Encoding: UTF-8 # NOTE: Please cite original publication, online resource and date accessed when using this data. # If there is no publication information, please cite Investigator, title, online resource and date accessed. # # Description/Documentation lines begin with # # Data lines have no # # # Online_Resource: https://www.ncdc.noaa.gov/paleo/study/24910 # Description: NOAA Landing Page # Online_Resource: http://www1.ncdc.noaa.gov/pub/data/paleo/reconstructions/rodysill2018/rodysill2018-2kslope.txt # Description: NOAA location of the template # Online_Resource: http://www1.ncdc.noaa.gov/pub/data/paleo/reconstructions/rodysill2018/rodysill2018-RecordsUsed_Metadata.txt # Description: NOAA location of the Records Used metadata template # # Archive: Climate Reconstructions # # Dataset_DOI: # # Parameter_Keywords: precipitation #--------------------------------------- # Contribution_Date # Date: 2018-08-17 #--------------------------------------- # File_Last_Modified_Date # Date: 2018-08-17 #--------------------------------------- # Title # Study_Name: North American Hydroclimate Synthesis (NAHS) from multi-proxy hydroclimate records over the Common Era #--------------------------------------- # Investigators # Investigators: 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 #--------------------------------------- # Description_Notes_and_Keywords # Description: 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. # Provided Keywords: precipitation, ground water, lake level, salinity, vegetation, lake salinity #--------------------------------------- # Publication # Authors: 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 # Published_Date_or_Year: 2018 # Published_Title: A North American Hydroclimate Synthesis (NAHS) of the Common Era # Journal_Name: Global and Planetary Change # Volume: 162 # Edition: # Issue: # Pages: 175-198 # Report_Number: # DOI: 10.1016/j.gloplacha.2017.12.025 # Online_Resource: www.sciencedirect.com/science/article/pii/S0921818117304174 # Full_Citation: # Abstract: 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. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: U.S. Geological Survey Climate and Land Use Change Research and Development Program # Grant: #--------------------------------------- # Site_Information # Site_Name: North America NAHS # Location: North America # Country: United States, Canada, Mexico # Northernmost_Latitude: 74.89164 # Southernmost_Latitude: 17.4 # Easternmost_Longitude: -63.5392 # Westernmost_Longitude: -159.4316 # Elevation: #--------------------------------------- # Data_Collection # Collection_Name: NAHS 2000yr slope Rodysill2018 # First_Year: -100 # Last_Year: 1900 # Time_Unit: CE # Core_Length: # Notes: More information in publication- Methods Section 3.6 #--------------------------------------- # Chronology_Information # Chronology: #--------------------------------------- # Variables # Data variables follow that are preceded by "##" in columns one and two. # Variables list, one per line, shortname-tab-longname components (9 components: what, material, error, units, seasonality, archive, detail, method, C or N for Character or Numeric data) ## source_data sample identification,,,,,climate reconstructions,,,C,site and proxy ## 2000-yr_slope moisture index,,,proxy unit per year,,climate reconstructions,,,N, ## 2000-yr_hydroclimate_trend moisture index,,,,,climate reconstructions,,,C,pos=wetter and neg=drier through time ## reverse notes,,,,,,,,N,"-1" indicates proxy values were reversed such that more positive values are interpreted as wetter #------------------------ # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing_Values: NA source_data 2000-yr_slope 2000-yr_hydroclimate_trend reverse 1-AguadaXcaamal_d18O 0.00098 neg -1 2-Baie_testate amoebae assemblage 0.000438 pos NA 3-BearLake_pollen assemblage 0.000643 pos NA 4-BlueLake_varve thickness -0.00073 neg NA 5-BuckeyeCreekCave_d18O -1.8E-05 neg NA 6-CastorLime_?d18O 0.000175 neg -1 7-ChesapeakeBay_MD03-2661_d18O -0.00046 pos -1 8-ChesapeakeBay_pollen assemblage 0.000335 pos NA 9-ClelandLake_d18O 4.48E-05 neg -1 10-ColdwaterLake_salinity 0.001976 neg -1 11-CrystalCave_d18O -3.5E-05 pos -1 12-DavisPond_lake level 0.000765 pos NA 13-DeepPond_lake level -0.00029 neg NA 14-DixieLake_diatom water depth -0.00051 neg NA 15-DuneLake_d13C -0.00036 pos -1 16-EastLake_grain size 3.09E-05 pos NA 17-ELALake239_diatom water depth 0.001098 pos NA 18-ELALake442_diatom water depth 0.000595 pos NA 19-ElkLake_%Al 0.000213 neg -1 20-FoyLake_d18O 0.000219 neg -1 21-FoyLake_benthic diatom abundance -0.00032 pos -1 22-GallLake_diatom water depth 0.000227 pos NA 23-GreatHeath_SVR 0.000118 pos NA 24-GreatSaltLake_pollen assemblage -8E-05 neg NA 25-HiddenLake_lake level 0.000458 pos NA 26-HobartLake_pollen assemblage -0.00098 neg NA 27-HorsetrailFen_plant macrofossil assemblage 9.42E-05 pos NA 28-IrwinSmithBog_pollen assemblage -0.00066 neg NA 29-JenningsCave_d13C -0.00104 pos -1 30-JuxtlahuacaCave_d18O -6.2E-06 pos -1 31-KecheLake_d18O -0.0009 neg NA 32-KirmanLake_diatom water depth -0.00837 pos -1 32-KirmanLake_salinity 0.000252 pos NA 33-KiteLake_pollen assemblage -0.00064 neg NA 34-LacLeCaron_plant macrofossil assemblage 0.000627 pos NA 35-LagunadeAljojuca_%Al2O3 -0.00082 pos -1 35-LagunadeAljojuca_d18O 0.000685 pos NA 36-LagunadeJuanacatlan_Ti 3.44E-06 pos NA 37-LakeChichancanab_density -3E-05 pos -1 38-LakeElsinore_%sand 0.000528 pos NA 39-LakeoftheWoods_lake level 0.001404 pos NA 40-Lebel_testate amoebae assemblage 0.000519 pos NA 41-LittleRaleighLake_diatom water depth -0.00203 neg NA 42-LowerBearLake_LOI950C -0.00873 pos -1 43-MarcellaJelly_?d18O 0.001325 neg -1 44-MartinLake_d18O -8.8E-05 neg NA 44-MartinLake_lithics -5.7E-05 neg NA 45-MB01_pollen assemblage -0.00088 neg NA 46-MeekinLake_diatom water depth 0.000669 pos NA 47-MindenBog_testate amoebae water table depth 0.007293 neg -1 48-Mono Lake_lake level + pos NA 49-MoonLake_salinity -0.00045 pos -1 50-Morts_testate amoebae assemblage 0.000641 pos NA 51-NewLongPond_lake level 0.00068 pos NA 52-OngokeLake_diatom water depth -0.00097 neg NA 53-OregonCaves_d13C 0.001247 neg -1 54-ParadiseLake_d18O 0.000874 neg -1 55-PathLake_pollen assemblage 5.42E-05 pos NA 56-Plaine_testate amoebae assemblage 0.001185 pos NA 57-PuntaLaguna_d18O 2.61E-05 neg -1 58-RiceLake_MgCa 3.68E-08 neg -1 59-RoeIsland_d13C-based salinity 0.000182 pos NA 60-SchellingsBogSB70_%pseudotsuga -0.00044 pos -1 60-SchellingsBogSB70_%quercus 0.000553 pos NA 61-Site4_pollen assemblage -2.5E-05 neg NA 62-SouthBay_d13C- and d18O-based salinity 0.000732 pos NA 63-SteelLake_d18O -0.00031 pos -1 64-Sugluk_plant macrofossil assemblage -0.00128 neg NA 65-UpperPinto_plant macrofossil assemblage -0.00048 neg NA 66-WalkerLake_d18O -0.00116 pos -1 67-WolverineLake_MineralMAR 0.000619 neg -1 68-YellowBison_?d18O 0.000661 neg -1 69-ZacaLake_%coarse 0.000165 pos NA