# PAGES North America 2k Detrending Database #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # Template Version 4.0 # Encoding: UTF-8 # NOTE: Please cite original publication, NOAA Landing Page URL, dataset and publication DOIs (where available), and date accessed when using downloaded data. # If there is no publication information, please cite investigator, study title, NOAA Landing Page URL, and date accessed. # # Description/Documentation lines begin with '#' followed by a space # Data lines have no '#' # # NOAA_Landing_Page: https://www.ncei.noaa.gov/access/paleo-search/study/39559 # Landing_Page_Description: NOAA Landing Page of this file's parent study, which includes all study metadata. # # Study_Level_JSON_Metadata: https://www.ncei.noaa.gov/pub/data/metadata/published/paleo/json/noaa-tree-39559.json # Study_Level_JSON_Description: JSON metadata of this data file's parent study, which includes all study metadata. # # Data_Type: Tree Ring # # Dataset_DOI: 10.25921/aqew-vr90 # # Science_Keywords: Air Temperature Reconstruction, PAGES 2k Network #--------------------------------------- # Resource_Links # # Data_Download_Resource: https://www.ncei.noaa.gov/pub/data/paleo/pages2k/mcpartland2020/mcpartland2020-northamerica2kdetrending.txt # Data_Download_Description: NOAA Template File; NAM2k Metadata # # Related_Online_Resource: https://www.ncei.noaa.gov/pub/data/paleo/pages2k/mcpartland2020/nam2k_dataprocessnoaa.R # Related_Online_Description: R file; NAM2k Data Processing Script # # Related_Online_Resource: https://www.ncei.noaa.gov/pub/data/paleo/pages2k/mcpartland2020/treetsv9_noaa.Rdata # Related_Online_Description: R data file; NAM2k Database # #--------------------------------------- # Contribution_Date # Date: 2024-06-11 #--------------------------------------- # File_Last_Modified_Date # Date: 2024-10-30 #--------------------------------------- # Title # Study_Name: PAGES North America 2k Detrending Database #--------------------------------------- # Investigators # Investigators: Anchukaitis, Kevin J. (https://orcid.org/https://orcid.org/0000-0002-8509-8080); Pederson, Gregory T. (https://orcid.org/https://orcid.org/0000-0002-6014-1425); St. George, Scott (https://orcid.org/https://orcid.org/0000-0002-0945-4944); McKay, Nick (https://orcid.org/https://orcid.org/0000-0002-0945-4944); Routson, Cody (https://orcid.org/https://orcid.org/0000-0001-8694-7809); Thapa, Uday (https://orcid.org/https://orcid.org/0000-0003-1664-2860) #--------------------------------------- # Description_Notes_and_Keywords # Description: PAGES North America 2k database, detrended in 6 different ways (1) Negative Exponential curves, 2) Age-dependent spline, 3) Age-dependent spline + variance stabilization, 4) Signal-free detrending, 5) Signal-free detrending + variance stabilization, 6) Regional curve standardization). The data is stored in LiPD format. Online resources for how to extract data from these types of data objects at https://lipdverse.org/. Three datasets are provided in LiPD format: "D", in which all data are grouped by site (total number of entries = 230); "treeTS", in which individual detrending methods are ungrouped (total number of entries = 1837); and "TS", in which individual detrending methods and their expressed population signal and average correlation coefficient statistics are ungrouped (total number of entries = 9190). # Provided Keywords: Detrending, tree rings, temperature, PAGES2k #--------------------------------------- # Publication # Authors: McPartland, M. Y., St. George, S., Pederson, G. T., and Anchukaitis, K. J. # Published_Date_or_Year: 2020 # Published_Title: Does signal-free detrending increase chronology coherence in large tree-ring networks? # Journal_Name: Dendrochronologia # Volume: 63 # Edition: # Issue: # Pages: # Report_Number: 125755 # DOI: 10.1016/j.dendro.2020.125755 # Online_Resource: # Full_Citation: # Abstract: Over the past decade, dendrochronologists have increasingly adopted the signal-free detrending (SFD) method to remove age-size trends in tree-ring measurement series, amplify the common stand-wide signal in composite chronologies, and recover medium- to low-frequency patterns that may be inadvertently removed by other detrending approaches. However, since its introduction in 2008, no systematic evaluation of the effects of SFD on tree-ring chronologies has been performed. Here we conduct the first review of SFD in dendrochronology and assess its effects when applied to large tree-ring networks. We analyzed the PAGES North America 2 K database of nearly 300 temperature-sensitive chronologies and the Missouri River database of over 350 chronologies curated for the purpose of reconstructing Missouri River streamflow. Both databases contain multiple versions of each chronology generated by different detrending methods, including those produced with (and without) the signal-free procedure applied. We evaluated (i) whether SFD increases chronology coherence at the site level by boosting the between-tree agreement, (ii) whether SFD increases coherence on a regional basis by making neighboring chronologies more similar to each other, and (iii) whether signal-free chronologies retained more medium- to low-frequency variability than their traditional counterparts. We find that, while SFD increased the strength of common signals in many instances, the effect was not universal and some sites even show a decrease in signal coherence. At regional scales, SFD increases chronology coherence in temperature-sensitive records but had no detectable effect on moisture-sensitive records. Our results demonstrate the importance of evaluating the effects of SFD prior to deploying this method for chronology development and paleoclimate reconstruction. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: USGS Powell Center # Grant: #--------------------------------------- # Site_Information # Site_Name: PAGES North America # Location: North America # Northernmost_Latitude: 68.65 # Southernmost_Latitude: 25.07 # Easternmost_Longitude: -61 # Westernmost_Longitude: -162.27 # Elevation_m: #--------------------------------------- # Data_Collection # Collection_Name: NorthAmerica2k_detrending # First_Year: -420 # Last_Year: 2012 # Time_Unit: year Common Era # Core_Length_m: # Parameter_Keywords: density, width # Notes: #--------------------------------------- # Chronology_Information # Chronology: # Detrending version (implemented using the CRUST platform https://doi.org/10.1016/j.dendro.2014.07.008) # Method LiPD Code Description # Negative Exponential Curve detrending NegEx Chronologies made of series of detrended using negative exponential curves # Regional Curve Standardization RCS Chronologies made of series detrended using regional curve standardization # Age-dependent spline detrending AgeDependentStdCrn Chronolgoies made of series detrended using age-dependent spline fitting # Age-dependent spline detrending + variance stabilization AgeDependentStdCrnStb Chronologies made of series detrended using age-dependent splines with variance stabilization at high-frequencies # Signal-free detrending SsfCrn Chronologies made of series detrended using a signal-free approach, combining age-dependent spline fitting with the 'signal-free' procedure # Signal-free detrending + variance stabilization SsfCrnStb Chronologies made of series detrended using a signal-free approach, combining age-dependent spline fitting with the 'signal-free' procedure, with high-frequency variance stablization # #--------------------------------------- # Variables # PaST_Thesaurus_Download_Resource: https://www.ncei.noaa.gov/access/paleo-search/skos/past-thesaurus.rdf # PaST_Thesaurus_Download_Description: Paleoenvironmental Standard Terms (PaST) Thesaurus terms, definitions, and relationships in SKOS format. # # Data variables follow that are preceded by "##" in columns one and two. # Variables list, one per line, shortname-tab-var components: what, material, error, units, seasonality, data type, detail, method, C or N for Character or Numeric data) # ## year age,,,year Common Era,,tree ring,,,N, ## NegEx.rw tree ring standardized growth index,ring width,,dimensionless,,tree ring,composited,,N,detrended using negative exponential ## NegEx.rw.eps tree ring standardized growth index,ring width,expressed population signal,dimensionless,,tree ring,composited,,N,detrended using negative exponential ## NegEx.rw.rbar tree ring standardized growth index,ring width,average correlation coefficient,dimensionless,,tree ring,composited,,N,detrended using negative exponential ## AgeDepStdCrn.rw tree ring standardized growth index,ring width,,dimensionless,,tree ring,composited,,N,Standard Chronology Version of the Age-Dependent Spline Detrended Chronology ## AgeDepStdCrn.rw.eps tree ring standardized growth index,ring width,expressed population signal,dimensionless,,tree ring,composited,,N,Standard Chronology Version of the Age-Dependent Spline Detrended Chronology ## AgeDepStdCrn.rw.rbar tree ring standardized growth index,ring width,average correlation coefficient,dimensionless,,tree ring,composited,,N,Standard Chronology Version of the Age-Dependent Spline Detrended Chronology ## SsfCrn.rw tree ring standardized growth index,ring width,,dimensionless,,tree ring,composited,,N,Signal Free Version of the Age-Dependent Spline Detrended Chronology ## SsfCrn.rw.eps tree ring standardized growth index,ring width,expressed population signal,dimensionless,,tree ring,composited,,N,Signal Free Version of the Age-Dependent Spline Detrended Chronology ## SsfCrn.rw.rbar tree ring standardized growth index,ring width,average correlation coefficient,dimensionless,,tree ring,composited,,N,Signal Free Version of the Age-Dependent Spline Detrended Chronology ## AgeDepStdCrnStb.rw tree ring standardized growth index,ring width,,dimensionless,,tree ring,composited,,N,Variance-stabilized Standard Chronology Version of the Age-Dependent Spline Detrended Chronology ## AgeDepStdCrnStb.rw.eps tree ring standardized growth index,ring width,expressed population signal,dimensionless,,tree ring,composited,,N,Variance-stabilized Standard Chronology Version of the Age-Dependent Spline Detrended Chronology ## AgeDepStdCrnStb.rw.rbar tree ring standardized growth index,ring width,average correlation coefficient,dimensionless,,tree ring,composited,,N,Variance-stabilized Standard Chronology Version of the Age-Dependent Spline Detrended Chronology ## SsfCrnStb.rw tree ring standardized growth index,ring width,,dimensionless,,tree ring,composited,,N,Variance-stabilized Signal Free Version of the Age-Dependent Spline Detrended Chronology ## SsfCrnStb.rw.eps tree ring standardized growth index,ring width,expressed population signal,dimensionless,,tree ring,composited,,N,Variance-stabilized Signal Free Version of the Age-Dependent Spline Detrended Chronology ## SsfCrnStb.rw.rbar tree ring standardized growth index,ring width,average correlation coefficient,dimensionless,,tree ring,composited,,N,Variance-stabilized Signal Free Version of the Age-Dependent Spline Detrended Chronology ## RCS.rw tree ring standardized growth index,ring width,,dimensionless,,tree ring,composited,,N,detrended using regional curve standardization ## RCS.rw.eps tree ring standardized growth index,ring width,expressed population signal,dimensionless,,tree ring,composited,,N,detrended using regional curve standardization ## RCS.rw.rbar tree ring standardized growth index,ring width,average correlation coefficient,dimensionless,,tree ring,composited,,N,detrended using regional curve standardization ## NegEx.mxd tree ring standardized growth index,ring density,,dimensionless,,tree ring,composited,,N,detrended using negative exponential ## NegEx.mxd.eps tree ring standardized growth index,ring density,expressed population signal,dimensionless,,tree ring,composited,,N,detrended using negative exponential ## NegEx.mxd.rbar tree ring standardized growth index,ring density,average correlation coefficient,dimensionless,,tree ring,composited,,N,detrended using negative exponential ## AgeDepStdCrn.mxd tree ring standardized growth index,ring density,,dimensionless,,tree ring,composited,,N,Standard Chronology Version of the Age-Dependent Spline Detrended Chronology ## AgeDepStdCrn.mxd.eps tree ring standardized growth index,ring density,expressed population signal,dimensionless,,tree ring,composited,,N,Standard Chronology Version of the Age-Dependent Spline Detrended Chronology ## AgeDepStdCrn.mxd.rbar tree ring standardized growth index,ring density,average correlation coefficient,dimensionless,,tree ring,composited,,N,Standard Chronology Version of the Age-Dependent Spline Detrended Chronology ## SsfCrn.mxd tree ring standardized growth index,ring density,,dimensionless,,tree ring,composited,,N,Signal Free Version of the Age-Dependent Spline Detrended Chronology ## SsfCrn.mxd.eps tree ring standardized growth index,ring density,expressed population signal,dimensionless,,tree ring,composited,,N,Signal Free Version of the Age-Dependent Spline Detrended Chronology ## SsfCrn.mxd.rbar tree ring standardized growth index,ring density,average correlation coefficient,dimensionless,,tree ring,composited,,N,Signal Free Version of the Age-Dependent Spline Detrended Chronology ## AgeDepStdCrnStb.mxd tree ring standardized growth index,ring density,,dimensionless,,tree ring,composited,,N,Variance-stabilized Standard Chronology Version of the Age-Dependent Spline Detrended Chronology ## AgeDepStdCrnStb.mxd.eps tree ring standardized growth index,ring density,expressed population signal,dimensionless,,tree ring,composited,,N,Variance-stabilized Standard Chronology Version of the Age-Dependent Spline Detrended Chronology ## AgeDepStdCrnStb.mxd.rbar tree ring standardized growth index,ring density,average correlation coefficient,dimensionless,,tree ring,composited,,N,Variance-stabilized Standard Chronology Version of the Age-Dependent Spline Detrended Chronology ## SsfCrnStb.mxd tree ring standardized growth index,ring density,,dimensionless,,tree ring,composited,,N,Variance-stabilized Signal Free Version of the Age-Dependent Spline Detrended Chronology ## SsfCrnStb.mxd.eps tree ring standardized growth index,ring density,expressed population signal,dimensionless,,tree ring,composited,,N,Variance-stabilized Signal Free Version of the Age-Dependent Spline Detrended Chronology ## SsfCrnStb.mxd.rbar tree ring standardized growth index,ring density,average correlation coefficient,dimensionless,,tree ring,composited,,N,Variance-stabilized Signal Free Version of the Age-Dependent Spline Detrended Chronology ## RCS.mxd tree ring standardized growth index,ring density,,dimensionless,,tree ring,composited,,N,detrended using regional curve standardization ## RCS.mxd.eps tree ring standardized growth index,ring density,expressed population signal,dimensionless,,tree ring,composited,,N,detrended using regional curve standardization ## RCS.mxd.rbar tree ring standardized growth index,ring density,average correlation coefficient,dimensionless,,tree ring,composited,,N,detrended using regional curve standardization ## num_cores number of samples,,,count,,tree ring,,,N,number of cores in chronology #------------------------ # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing_Values: