; archiveType changed - was originally Lake sediment (LS); archiveType changed - was originally Lake sediment (LS)
the Holocene was sampled more intensively (every 0.5 cm), 4 cm intervals from 3000 cal. BP to the present, and at 1 cm intervals prior to 8200 cal. BP; Optically pure diatomite was obtained by oxidation (H2O2) to remove organics, an acid wash (10% HCl) to remove carbonates and gravity settling to remove small amounts of clay. The hydrous layer of the diatoms was stripped by outgassing during a prefluorination.
summer precipitation would impose a shift in the isotopic composition of the lake water and ultimately in the d18Odiatom record. More positive d18Odiatom values would suggest a greater contribution of summer rainfall from the Atlantic, bringing warmer temperatures. While more negative d18Odiatom suggests a greater contribution from the colder Arctic air mass.
The diatom blooms that provide the biogenic silica to the sediment occur in the summer months, June? September, when the lake is ice-free, when temperatures are highest and when rainfall is heaviest enabling nutrients to be washed in from the catchment. The d18Odiatom signal therefore reflects the climatic regime during the summer months although there will be a component of winter precipitation released from ice and snow in the catchment during the early summer thaw.; evaporative effects on the isotopic composition of the lake water are minimal.;comparison with the pollen based temperature reconstruction indicates that the magnitude and direction of the isotope inferred temperature change is unrealistic.;
d18O values were normalised through laboratory standards and NBS28, and corrected according to Craig (1957) and Deines (1970).
; archiveType changed - was originally Lake sediment (LS)
fraction of modern 14C activity uncertainty
210Pb, 239+240Pu or 137Cs activity uncertainty
Y if supported 210Pb activity, N if unsupported 210Pb activity
model used to convert 210Pb activity to age (e.g., constant rate of supply)
ages derived from SOLOVIEVA and JONES, 2002 are 1996 AD and 8998 cal yr BP (-7048 AD)
depth (LPD87f9c656): interpretation4_scope: '' has been replaced by 'climate'
age (LPDd737d3bd): interpretation4_scope: '' has been replaced by 'climate'
Updated lipdverse database entry with a changed file.
age (LPDd737d3bd): paleoData_units: 'yr AD' has been replaced by 'yr BP'
age (LPDd737d3bd): paleoData_variableName: 'year' has been replaced by 'age'
depth (LPD87f9c656): interpretation3_scope: '' has been replaced by 'climate'
year (LPDd737d3bd): interpretation3_scope: '' has been replaced by 'climate'
depth (LPD87f9c656): paleoData_isPrimary: '' has been replaced by 'FALSE'
depth (LPD87f9c656): paleoData_primaryAgeColumn: '' has been replaced by 'FALSE'
year (LPDd737d3bd): paleoData_isPrimary: '' has been replaced by 'TRUE'
year (LPDd737d3bd): paleoData_primaryAgeColumn: '' has been replaced by 'TRUE'
d18O (LS04JOCH): paleoData_isPrimary: '' has been replaced by 'FALSE'
d18O (LS04JOCH): paleoData_primaryAgeColumn: '' has been replaced by 'FALSE'
depth (LPD87f9c656): interpretation1_scope: '' has been replaced by 'climate'
depth (LPD87f9c656): interpretation2_scope: '' has been replaced by 'climate'
year (LPDd737d3bd): interpretation1_scope: '' has been replaced by 'climate'
year (LPDd737d3bd): interpretation2_scope: '' has been replaced by 'climate'
d18O (LS04JOCH): interpretation2_basis: 'The diatom blooms that provide the biogenic silica to the sediment occur in the summer months, June? September, when the lake is ice-free, when temperatures are highest and when rainfall is heaviest enabling nutrients to be washed in from the catchment. The d18Odiatom signal therefore reflects the climatic regime during the summer months although there will be a component of winter precipitation released from ice and snow in the catchment during the early summer thaw.; evaporative effects on the isotopic composition of the lake water are minimal.;comparison with the pollen based temperature reconstruction indicates that the magnitude and direction of the isotope inferred temperature change is unrealistic.;' has been replaced by ''
d18O (LS04JOCH): interpretation2_direction: 'positive' has been replaced by ''
d18O (LS04JOCH): interpretation2_inferredMaterial: 'lake water' has been replaced by ''
d18O (LS04JOCH): interpretation2_rank: '1' has been replaced by ''
d18O (LS04JOCH): interpretation2_scope: 'isotope' has been replaced by 'climate'
d18O (LS04JOCH): interpretation2_seasonality: 'Jun-Aug' has been replaced by ''
d18O (LS04JOCH): interpretation2_seasonalityOriginal: 'summer' has been replaced by ''
d18O (LS04JOCH): interpretation2_variable: 'precipitationIsotope' has been replaced by ''
d18O (LS04JOCH): interpretation2_variableGroup: 'P_isotope' has been replaced by ''
d18O (LS04JOCH): interpretation2_variableGroupDirection: 'positive' has been replaced by ''
d18O (LS04JOCH): interpretation3_scope: '' has been replaced by 'climate'
d18O (LS04JOCH): interpretation4_basis: '' has been replaced by 'The diatom blooms that provide the biogenic silica to the sediment occur in the summer months, June? September, when the lake is ice-free, when temperatures are highest and when rainfall is heaviest enabling nutrients to be washed in from the catchment. The d18Odiatom signal therefore reflects the climatic regime during the summer months although there will be a component of winter precipitation released from ice and snow in the catchment during the early summer thaw.; evaporative effects on the isotopic composition of the lake water are minimal.;comparison with the pollen based temperature reconstruction indicates that the magnitude and direction of the isotope inferred temperature change is unrealistic.;'
d18O (LS04JOCH): interpretation4_direction: '' has been replaced by 'positive'
d18O (LS04JOCH): interpretation4_inferredMaterial: '' has been replaced by 'lake water'
d18O (LS04JOCH): interpretation4_rank: '' has been replaced by '1'
d18O (LS04JOCH): interpretation4_scope: '' has been replaced by 'isotope'
d18O (LS04JOCH): interpretation4_seasonality: '' has been replaced by 'Jun-Aug'
d18O (LS04JOCH): interpretation4_seasonalityOriginal: '' has been replaced by 'summer'
d18O (LS04JOCH): interpretation4_variable: '' has been replaced by 'precipitationIsotope'
d18O (LS04JOCH): interpretation4_variableGroup: '' has been replaced by 'P_isotope'
d18O (LS04JOCH): interpretation4_variableGroupDirection: '' has been replaced by 'positive'
d18O (LS04JOCH): interpretation5_scope: '' has been replaced by 'isotope'
d18O (LS04JOCH): interpretation6_scope: '' has been replaced by 'isotope'
d18O (LS04JOCH): interpretation1_variable: 'P' has been replaced by 'precipitation'
d18O (LS04JOCH): interpretation2_seasonality: 'JJA' has been replaced by 'Jun-Aug'
d18O (LS04JOCH): interpretation2_variable: 'P_isotope' has been replaced by 'precipitationIsotope'
Column 'chron15', with variable name 'age', was removed from the dataset
Changes made as part of LiPDverse vocabulary standardization process
depth (LPD87f9c656): paleoData_longName: '' has been replaced by 'AD'
year (LPDd737d3bd): paleoData_units: 'AD' has been replaced by 'yr AD'
year (LPDd737d3bd): paleoData_longName: '' has been replaced by 'AD'
d18O (LS04JOCH): paleoData_longName: '' has been replaced by 'AD'
Jones, Vivienne J. , Leng, Melanie J. , Solovieva, Nadia , Sloane, Hilary J. , Tarasov, Pavel
Jones, V. J., Leng, M. J., Solovieva, N., Sloane, H. J. and Tarasov, P.: Holocene climate of the Kola Peninsula; evidence from the oxygen isotope record of diatom silica, Quaternary Science Reviews, 23(7-8), 833–839, doi:10.1016/j.quascirev.2003.06.014, 2004.
Holocene climate of the Kola Peninsula; evidence from the oxygen isotope record of diatom silica