NA; paleoData_isPrimary has been standardized
NA; paleoData_isPrimary has been standardized; paleoData_datum has been standardized
BSi, OM, and MS are included in Sundqvist et al. 2014. For the Temperature 12k database, we opt to include the pollen-based reconstruction instead.
Included in Sundqvist; superceeded by pollen reconstruction
Temp12k-1_0_2, HoloceneAbruptChange-0_10_0
sample resolution is low (between 500 and 600 yr); retain to improve High Arctic coverage
Variable name changed from age14C to age during update from DKs csv files.
Variable name changed from age_error to 1SD during update from DKs csv files.
This dataset is from version 2 of the Arctic Holocene Transitions Database, and has been expanded to include an ensemble of chronologies, which are included in this file. This is described in McKay et al., 2018: doi:10.1029/2018GL079773
depth (PYTG7FI0K7Z): interpretation1_scope: '' has been replaced by 'climate'
depth (PYTHO9A4K8O): interpretation1_scope: '' has been replaced by 'climate'
age (PYTPNKIVVO7): interpretation1_scope: '' has been replaced by 'climate'
age (PYTT7TVFP4K): interpretation1_scope: '' has been replaced by 'climate'
age (PYTZMRX4C9M): interpretation1_scope: '' has been replaced by 'climate'
depth (WEB4e404817): interpretation1_scope: '' has been replaced by 'climate'
age (WEBd4ffad86): interpretation1_scope: '' has been replaced by 'climate'
MS (PYT1C23IDQ4): paleoData_isPrimary: '' has been replaced by 'FALSE'
MS (PYT1C23IDQ4): paleoData_primaryAgeColumn: '' has been replaced by 'FALSE'
BSi (PYTCC5TMACT): paleoData_isPrimary: '' has been replaced by 'FALSE'
BSi (PYTCC5TMACT): paleoData_primaryAgeColumn: '' has been replaced by 'FALSE'
depth (PYTG7FI0K7Z): paleoData_primaryAgeColumn: '' has been replaced by 'FALSE'
BSi (PYTGDOTSUKQ): paleoData_isPrimary: '' has been replaced by 'FALSE'
BSi (PYTGDOTSUKQ): paleoData_primaryAgeColumn: '' has been replaced by 'FALSE'
organicMatter (PYTHHDDGRIK): paleoData_isPrimary: '' has been replaced by 'FALSE'
organicMatter (PYTHHDDGRIK): paleoData_primaryAgeColumn: '' has been replaced by 'FALSE'
depth (PYTHO9A4K8O): paleoData_primaryAgeColumn: '' has been replaced by 'FALSE'
age (PYTPNKIVVO7): paleoData_primaryAgeColumn: '' has been replaced by 'TRUE'
age (PYTT7TVFP4K): paleoData_primaryAgeColumn: '' has been replaced by 'TRUE'
age (PYTZMRX4C9M): paleoData_primaryAgeColumn: '' has been replaced by 'TRUE'
depth (WEB4e404817): paleoData_primaryAgeColumn: '' has been replaced by 'FALSE'
precipitation (WEB7044f382): paleoData_isPrimary: '' has been replaced by 'FALSE'
precipitation (WEB7044f382): paleoData_primaryAgeColumn: '' has been replaced by 'FALSE'
temperature (WEBa45174e3): paleoData_isPrimary: '' has been replaced by 'FALSE'
temperature (WEBa45174e3): paleoData_primaryAgeColumn: '' has been replaced by 'FALSE'
age (WEBd4ffad86): paleoData_primaryAgeColumn: '' has been replaced by 'TRUE'
Updated lipdverse database entry with a changed file.
Column 'BC01Lake.Peros.2010-chron-NA1', with variable name 'depth', was added to the dataset
Column 'BC01Lake.Peros.2010-chron-NA2', with variable name 'age.rangeLow', was added to the dataset
Column 'BC01Lake.Peros.2010-chron-NA3', with variable name 'age.rangeHigh', was added to the dataset
Column 'BC01Lake.Peros.2010-chron-NA4', with variable name 'age', was added to the dataset
Column 'BC01Lake.Peros.2010-chron-NA5', with variable name 'depth', was added to the dataset
Column 'BC01Lake.Peros.2010-chron-NA6', with variable name 'ageEnsemble', was added to the dataset
Column 'WEB-82317-06f3-40f0-a8e5-5cd92', with variable name 'depth', was added to the dataset
Column 'WEB-a8317-2edf-464a-9740-d1cd8', with variable name 'rejected', was added to the dataset
Column 'WEB-d256c-4f60-49f5-bf24-b786c', with variable name 'age', was added to the dataset
Column 'WEB-d98f1-3bde-466f-acfa-ce062', with variable name 'uncertainty1s', was added to the dataset
age14C (PYT1JQ867C4): chronData_units: 'yr' has been replaced by 'yr 14C BP'
age14C (PYT1JQ867C4): chronData_variableName: 'age' has been replaced by 'age14C'
depthBottom (PYT4BI5G37T): chronData_units: 'mm' has been replaced by 'cm'
depthBottom (PYT4BI5G37T): chronData_variableName: 'depth_bottom' has been replaced by 'depthBottom'
age14C_uncertainty1s (PYTAMDYL6KX): chronData_units: 'yr' has been replaced by 'yr 14C BP'
age14C_uncertainty1s (PYTAMDYL6KX): chronData_variableName: '1SD' has been replaced by 'age14C_uncertainty1s'
depthTop (PYTQY6MIBSM): chronData_units: 'mm' has been replaced by 'cm'
depthTop (PYTQY6MIBSM): chronData_variableName: 'depth_top' has been replaced by 'depthTop'
ageType (WEBe2238ce3): chronData_variableName: 'age_type' has been replaced by 'ageType'
material (cRQCKd75FJJT9D4cKe): chronData_units: '' has been replaced by 'unitless'
age14C (PYT1JQ867C4): The size of the chronData_values have changed, from 12 to 20 entries.
depthBottom (PYT4BI5G37T): The size of the chronData_values have changed, from 12 to 20 entries.
age14C_uncertainty1s (PYTAMDYL6KX): The size of the chronData_values have changed, from 12 to 20 entries.
depthTop (PYTQY6MIBSM): The size of the chronData_values have changed, from 12 to 20 entries.
ageType (WEBe2238ce3): The size of the chronData_values have changed, from 12 to 20 entries.
material (cRQCKd75FJJT9D4cKe): The size of the chronData_values have changed, from 12 to 20 entries.
BSi (PYTGDOTSUKQ): paleoData_inCompilation: 'Tverse' has been replaced by 'Temp12k'
BSi (PYTCC5TMACT): paleoData_proxyGeneral: 'biophysical' has been replaced by 'biogenic'
BSi (PYTGDOTSUKQ): paleoData_proxyGeneral: 'biophysical' has been replaced by 'biogenic'
precipitation (WEB7044f382): paleoData_proxyGeneral: 'pollen' has been replaced by 'floral assemblage'
temperature (WEBa45174e3): paleoData_proxyGeneral: 'pollen' has been replaced by 'floral assemblage'
geo_elevation: '' has been replaced by '216'
depth (PYTG7FI0K7Z): paleoData_isPrimary: '' has been replaced by 'TRUE'
depth (PYTG7FI0K7Z): paleoData_notes: '' has been replaced by 'NA; paleoData_isPrimary has been standardized'
organicMatter (PYTHHDDGRIK): paleoData_variableName: 'OM' has been replaced by 'organicMatter'
depth (PYTHO9A4K8O): paleoData_isPrimary: '' has been replaced by 'TRUE'
depth (PYTHO9A4K8O): paleoData_notes: '' has been replaced by 'NA; paleoData_isPrimary has been standardized'
age (PYTPNKIVVO7): paleoData_datum: '' has been replaced by '1950'
age (PYTPNKIVVO7): paleoData_units: 'BP' has been replaced by 'yr BP'
age (PYTPNKIVVO7): paleoData_isPrimary: '' has been replaced by 'TRUE'
age (PYTPNKIVVO7): paleoData_notes: '' has been replaced by 'NA; paleoData_isPrimary has been standardized; paleoData_datum has been standardized'
age (PYTT7TVFP4K): paleoData_datum: '' has been replaced by '1950'
age (PYTT7TVFP4K): paleoData_units: 'BP' has been replaced by 'yr BP'
age (PYTT7TVFP4K): paleoData_isPrimary: '' has been replaced by 'TRUE'
age (PYTT7TVFP4K): paleoData_notes: '' has been replaced by 'NA; paleoData_isPrimary has been standardized; paleoData_datum has been standardized'
age (PYTZMRX4C9M): paleoData_datum: '' has been replaced by '1950'
age (PYTZMRX4C9M): paleoData_units: 'BP' has been replaced by 'yr BP'
age (PYTZMRX4C9M): paleoData_isPrimary: '' has been replaced by 'TRUE'
age (PYTZMRX4C9M): paleoData_notes: '' has been replaced by 'NA; paleoData_isPrimary has been standardized; paleoData_datum has been standardized'
depth (WEB4e404817): paleoData_isPrimary: '' has been replaced by 'TRUE'
depth (WEB4e404817): paleoData_notes: '' has been replaced by 'NA; paleoData_isPrimary has been standardized'
age (WEBd4ffad86): paleoData_datum: '' has been replaced by '1950'
age (WEBd4ffad86): paleoData_units: 'BP' has been replaced by 'yr BP'
age (WEBd4ffad86): paleoData_isPrimary: '' has been replaced by 'TRUE'
age (WEBd4ffad86): paleoData_notes: '' has been replaced by 'NA; paleoData_isPrimary has been standardized; paleoData_datum has been standardized'
BSi (PYTGDOTSUKQ): interpretation1_variable: 'T' has been replaced by 'temperature'
precipitation (WEB7044f382): interpretation1_seasonality: 'annual' has been replaced by 'Annual'
precipitation (WEB7044f382): interpretation1_variable: 'P' has been replaced by 'precipitation'
temperature (WEBa45174e3): interpretation1_seasonality: '7' has been replaced by 'Jul'
temperature (WEBa45174e3): interpretation1_variable: 'T' has been replaced by 'temperature'
pub1_volume: '73' has been replaced by ''
pub1_doi: '10.1016/j.yqres.2009.11.010' has been replaced by ''
geo_elevation: '216' has been replaced by ''
precipitation (WEB7044f382): interpretation1_variableDetail: 'precip@surface' has been replaced by 'precipitation@surface'
MS (PYT1C23IDQ4): interpretation1_scope: '' has been replaced by 'climate'
MS (PYT1C23IDQ4): interpretation1_scope: 'climate' has been replaced by ''
BSi (PYTCC5TMACT): paleoData_proxyLumps: '' has been replaced by 'biophysical'
BSi (PYTCC5TMACT): paleoData_proxyLumpsOriginal: '' has been replaced by 'BSi'
BSi (PYTGDOTSUKQ): paleoData_mostRecentCompilations: '' has been replaced by 'HoloceneAbruptChange-0_6_0'
precipitation (WEB7044f382): paleoData_mostRecentCompilations: '' has been replaced by 'HoloceneAbruptChange-0_10_0'
temperature (WEBa45174e3): paleoData_mostRecentCompilations: '' has been replaced by 'Temp12k-1_0_2, HoloceneAbruptChange-0_10_0'
BSi (PYTCC5TMACT): paleoData_proxy: '' has been replaced by 'BSi'
BSi (PYTCC5TMACT): paleoData_proxyDetail: '' has been replaced by 'bulk sediment'
BSi (PYTCC5TMACT): paleoData_proxyGeneral: '' has been replaced by 'biophysical'
precipitation (WEB7044f382): paleoData_datum: '' has been replaced by 'abs'
precipitation (WEB7044f382): interpretation1_seasonalityGeneral: '' has been replaced by 'annual'
precipitation (WEB7044f382): interpretation1_variableDetail: '' has been replaced by 'precip@surface'
precipitation (WEB7044f382): paleoData_QCnotes: '' has been replaced by 'Sample Resolution >400yrs'
precipitation (WEB7044f382): paleoData_proxyGeneral: '' has been replaced by 'pollen'
This marks the creation of the changelog, and marks the status of this dataset as of Temp12k version 1.0.1
Peros, Matthew; Gajewski, Konrad; Paull, Tara; Ravindra, Rebecca; Podritske, Brandi
Multi-proxy record of postglacial environmental change, south-central Melville Island, Northwest Territories, Canada
Abstract. We present a systematic compilation of previously published Holocene proxy climate records from the Arctic. We identified 170 sites from north of 58° N latitude where proxy time series extend back at least to 6 cal ka (all ages in this article are in calendar years before present – BP), are resolved at submillennial scale (at least one value every 400 ± 200 years) and have age models constrained by at least one age every 3000 years. In addition to conventional metadata for each proxy record (location, proxy type, reference), we include two novel parameters that add functionality to the database. First, "climate interpretation" is a series of fields that logically describe the specific climate variable(s) represented by the proxy record. It encodes the proxy–climate relation reported by authors of the original studies into a structured format to facilitate comparison with climate model outputs. Second, "geochronology accuracy score" (chron score) is a numerical rating that reflects the overall accuracy of 14C-based age models from lake and marine sediments. Chron scores were calculated using the original author-reported 14C ages, which are included in this database. The database contains 320 records (some sites include multiple records) from six regions covering the circumpolar Arctic: Fennoscandia is the most densely sampled region (31% of the records), whereas only five records from the Russian Arctic met the criteria for inclusion. The database contains proxy records from lake sediment (60%), marine sediment (32%), glacier ice (5%), and other sources. Most (61%) reflect temperature (mainly summer warmth) and are primarily based on pollen, chironomid, or diatom assemblages. Many (15%) reflect some aspect of hydroclimate as inferred from changes in stable isotopes, pollen and diatom assemblages, humification index in peat, and changes in equilibrium-line altitude of glaciers. This comprehensive database can be used in future studies to investigate the spatio-temporal pattern of Arctic Holocene climate changes and their causes. The Arctic Holocene data set is available from NOAA Paleoclimatology.
Arctic Holocene proxy climate database &ndash; new approaches to assessing geochronological accuracy and encoding climate variables
North America>Canada>Northwest Territories