; archiveType changed - was originally Lake sediment (LS)
Sieved and cleaned following Xia et al. 1997
Hypothesised that deep lake temperatures dont change, as recorded by benthic ostracods Thus difference between ostracods and authigenic carbonate relates to temperature
Although evaporation could potentially cause more 18O enrichment in surface water than in bottom water of a lake, this factor is likely negligible at Farewell Lake, because the lake has a large volume (maximum depth of the south basin: 55 m; surface area: 4 km2) and because no major moisture deficit exists in the region. This argument is supported by the fact that the 18O values (12.2?12.5?) of water samples taken weekly from the lake surface during July 19?September 25, 2000, show no time-dependent trend. 18Oac reflects changes in atmospheric temperature, as abiotic carbonate precipitation occurs in surface water, where the temperature fluctuates in response to atmospheric temperature changes (19). In contrast, because Farewell Lake is deep and has a large water volume, the bottom-water temperature likely remains constant at 4i¿½C, as it was in June 1990 and July 2000, based on field measurements. Therefore, the deviation of 18Oac from contemporaneous 18Obo results from oxygen-isotope frac- tionation induced by the temperature difference between sur- face and bottom waters after accounting for any vital effects.
chronology; hydrology; seasonality; habitat; vital effects
deltaT = [(d18Oac - d18Obo)past - (d18Oac - d18Obo)modern]/-0.25
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)
years before 1950 (calibrated age, or ages that dont need calibration)
d18O (LS01HUFA01a): paleoData_isPrimary: '' has been replaced by 'FALSE'
d18O (LS01HUFA01a): paleoData_primaryAgeColumn: '' has been replaced by 'FALSE'
d18O (LS01HUFA01b): paleoData_isPrimary: '' has been replaced by 'FALSE'
d18O (LS01HUFA01b): paleoData_primaryAgeColumn: '' has been replaced by 'FALSE'
depth (MAT00f3a744ed): paleoData_isPrimary: '' has been replaced by 'FALSE'
depth (MAT00f3a744ed): paleoData_primaryAgeColumn: '' has been replaced by 'FALSE'
year (MAT0abffcd25c): paleoData_isPrimary: '' has been replaced by 'TRUE'
year (MAT0abffcd25c): paleoData_primaryAgeColumn: '' has been replaced by 'TRUE'
d18O (LS01HUFA01a): interpretation2_basis: 'Although evaporation could potentially cause more 18O enrichment in surface water than in bottom water of a lake, this factor is likely negligible at Farewell Lake, because the lake has a large volume (maximum depth of the south basin: 55 m; surface area: 4 km2) and because no major moisture deficit exists in the region. This argument is supported by the fact that the 18O values (12.2?12.5?) of water samples taken weekly from the lake surface during July 19?September 25, 2000, show no time-dependent trend. 18Oac reflects changes in atmospheric temperature, as abiotic carbonate precipitation occurs in surface water, where the temperature fluctuates in response to atmospheric temperature changes (19). In contrast, because Farewell Lake is deep and has a large water volume, the bottom-water temperature likely remains constant at 4i¿½C, as it was in June 1990 and July 2000, based on field measurements. Therefore, the deviation of 18Oac from contemporaneous 18Obo results from oxygen-isotope frac- tionation induced by the temperature difference between sur- face and bottom waters after accounting for any vital effects.' has been replaced by ''
d18O (LS01HUFA01a): interpretation2_direction: 'negative' has been replaced by ''
d18O (LS01HUFA01a): interpretation2_inferredMaterial: 'lake water' has been replaced by ''
d18O (LS01HUFA01a): interpretation2_integrationTimeUncertaintyType: 'chronology; hydrology; seasonality; habitat; vital effects' has been replaced by ''
d18O (LS01HUFA01a): interpretation2_integrationTimeUnits: 'years' has been replaced by ''
d18O (LS01HUFA01a): interpretation2_rank: '1' has been replaced by ''
d18O (LS01HUFA01a): interpretation2_scope: 'isotope' has been replaced by 'climate'
d18O (LS01HUFA01a): interpretation2_seasonality: 'Summer' has been replaced by ''
d18O (LS01HUFA01a): interpretation2_seasonalityOriginal: 'summer' has been replaced by ''
d18O (LS01HUFA01a): interpretation2_variable: 'effectivePrecipitation' has been replaced by ''
d18O (LS01HUFA01a): interpretation2_variableGroup: 'EffectiveMoisture' has been replaced by ''
d18O (LS01HUFA01a): interpretation2_variableGroupDirection: 'negative' has been replaced by ''
d18O (LS01HUFA01a): interpretation2_variableGroupOriginal: 'P_E' has been replaced by ''
d18O (LS01HUFA01a): interpretation3_inferredMaterial: 'lake water' has been replaced by ''
d18O (LS01HUFA01a): interpretation3_integrationTimeUncertaintyType: 'chronology; hydrology; seasonality; habitat; vital effects' has been replaced by ''
d18O (LS01HUFA01a): interpretation3_integrationTimeUnits: 'years' has been replaced by ''
d18O (LS01HUFA01a): interpretation3_rank: '2' has been replaced by ''
d18O (LS01HUFA01a): interpretation3_scope: 'isotope' has been replaced by 'climate'
d18O (LS01HUFA01a): interpretation3_variable: 'precipitationIsotope' has been replaced by ''
d18O (LS01HUFA01a): interpretation3_variableGroup: 'P_isotope' has been replaced by ''
d18O (LS01HUFA01a): interpretation3_variableGroupDirection: 'positive' has been replaced by ''
d18O (LS01HUFA01a): interpretation3_variableGroupOriginal: 'd18Op' has been replaced by ''
d18O (LS01HUFA01a): interpretation4_basis: '' has been replaced by 'Although evaporation could potentially cause more 18O enrichment in surface water than in bottom water of a lake, this factor is likely negligible at Farewell Lake, because the lake has a large volume (maximum depth of the south basin: 55 m; surface area: 4 km2) and because no major moisture deficit exists in the region. This argument is supported by the fact that the 18O values (12.2?12.5?) of water samples taken weekly from the lake surface during July 19?September 25, 2000, show no time-dependent trend. 18Oac reflects changes in atmospheric temperature, as abiotic carbonate precipitation occurs in surface water, where the temperature fluctuates in response to atmospheric temperature changes (19). In contrast, because Farewell Lake is deep and has a large water volume, the bottom-water temperature likely remains constant at 4i¿½C, as it was in June 1990 and July 2000, based on field measurements. Therefore, the deviation of 18Oac from contemporaneous 18Obo results from oxygen-isotope frac- tionation induced by the temperature difference between sur- face and bottom waters after accounting for any vital effects.'
d18O (LS01HUFA01a): interpretation4_direction: '' has been replaced by 'negative'
d18O (LS01HUFA01a): interpretation4_inferredMaterial: '' has been replaced by 'lake water'
d18O (LS01HUFA01a): interpretation4_integrationTimeUncertaintyType: '' has been replaced by 'chronology; hydrology; seasonality; habitat; vital effects'
d18O (LS01HUFA01a): interpretation4_integrationTimeUnits: '' has been replaced by 'years'
d18O (LS01HUFA01a): interpretation4_rank: '' has been replaced by '1'
d18O (LS01HUFA01a): interpretation4_scope: '' has been replaced by 'isotope'
d18O (LS01HUFA01a): interpretation4_seasonality: '' has been replaced by 'Summer'
d18O (LS01HUFA01a): interpretation4_seasonalityOriginal: '' has been replaced by 'summer'
d18O (LS01HUFA01a): interpretation4_variable: '' has been replaced by 'effectivePrecipitation'
d18O (LS01HUFA01a): interpretation4_variableGroup: '' has been replaced by 'EffectiveMoisture'
d18O (LS01HUFA01a): interpretation4_variableGroupDirection: '' has been replaced by 'negative'
d18O (LS01HUFA01a): interpretation4_variableGroupOriginal: '' has been replaced by 'P_E'
d18O (LS01HUFA01a): interpretation5_inferredMaterial: '' has been replaced by 'lake water'
d18O (LS01HUFA01a): interpretation5_integrationTimeUncertaintyType: '' has been replaced by 'chronology; hydrology; seasonality; habitat; vital effects'
d18O (LS01HUFA01a): interpretation5_integrationTimeUnits: '' has been replaced by 'years'
d18O (LS01HUFA01a): interpretation5_rank: '' has been replaced by '2'
d18O (LS01HUFA01a): interpretation5_scope: '' has been replaced by 'isotope'
d18O (LS01HUFA01a): interpretation5_variable: '' has been replaced by 'precipitationIsotope'
d18O (LS01HUFA01a): interpretation5_variableGroup: '' has been replaced by 'P_isotope'
d18O (LS01HUFA01a): interpretation5_variableGroupDirection: '' has been replaced by 'positive'
d18O (LS01HUFA01a): interpretation5_variableGroupOriginal: '' has been replaced by 'd18Op'
d18O (LS01HUFA01a): interpretation6_scope: '' has been replaced by 'isotope'
d18O (LS01HUFA01b): interpretation2_basis: 'Epstein et al., 1953 (GSAB 64:1315)' has been replaced by ''
d18O (LS01HUFA01b): interpretation2_direction: 'negative' has been replaced by ''
d18O (LS01HUFA01b): interpretation2_inferredMaterial: 'lake water' has been replaced by ''
d18O (LS01HUFA01b): interpretation2_rank: '1' has been replaced by ''
d18O (LS01HUFA01b): interpretation2_scope: 'isotope' has been replaced by 'climate'
d18O (LS01HUFA01b): interpretation2_seasonality: 'Jun-Aug' has been replaced by ''
d18O (LS01HUFA01b): interpretation2_seasonalityOriginal: 'summer' has been replaced by ''
d18O (LS01HUFA01b): interpretation2_variable: 'temperature' has been replaced by ''
d18O (LS01HUFA01b): interpretation2_variableGroup: 'Temperature' has been replaced by ''
d18O (LS01HUFA01b): interpretation2_variableGroupDirection: 'negative' has been replaced by ''
d18O (LS01HUFA01b): interpretation2_variableGroupOriginal: 'T_water' has been replaced by ''
d18O (LS01HUFA01b): interpretation3_scope: '' has been replaced by 'climate'
d18O (LS01HUFA01b): interpretation4_basis: '' has been replaced by 'Epstein et al., 1953 (GSAB 64:1315)'
d18O (LS01HUFA01b): interpretation4_direction: '' has been replaced by 'negative'
d18O (LS01HUFA01b): interpretation4_inferredMaterial: '' has been replaced by 'lake water'
d18O (LS01HUFA01b): interpretation4_rank: '' has been replaced by '1'
d18O (LS01HUFA01b): interpretation4_scope: '' has been replaced by 'isotope'
d18O (LS01HUFA01b): interpretation4_seasonality: '' has been replaced by 'Jun-Aug'
d18O (LS01HUFA01b): interpretation4_seasonalityOriginal: '' has been replaced by 'summer'
d18O (LS01HUFA01b): interpretation4_variable: '' has been replaced by 'temperature'
d18O (LS01HUFA01b): interpretation4_variableGroup: '' has been replaced by 'Temperature'
d18O (LS01HUFA01b): interpretation4_variableGroupDirection: '' has been replaced by 'negative'
d18O (LS01HUFA01b): interpretation4_variableGroupOriginal: '' has been replaced by 'T_water'
d18O (LS01HUFA01b): interpretation5_scope: '' has been replaced by 'isotope'
d18O (LS01HUFA01b): interpretation6_scope: '' has been replaced by 'isotope'
depth (MAT00f3a744ed): interpretation1_scope: '' has been replaced by 'climate'
depth (MAT00f3a744ed): interpretation2_scope: '' has been replaced by 'climate'
year (MAT0abffcd25c): interpretation1_scope: '' has been replaced by 'climate'
year (MAT0abffcd25c): interpretation2_scope: '' has been replaced by 'climate'
Updated lipdverse database entry with a changed file.
d18O (LS01HUFA01a): interpretation1_variable: 'T' has been replaced by 'temperature'
d18O (LS01HUFA01a): interpretation2_variable: 'P_E' has been replaced by 'effectivePrecipitation'
d18O (LS01HUFA01a): interpretation3_variable: 'd18Op' has been replaced by 'precipitationIsotope'
d18O (LS01HUFA01b): interpretation1_seasonality: 'growing season' has been replaced by 'Growing Season'
d18O (LS01HUFA01b): interpretation1_variable: 'T' has been replaced by 'temperature'
d18O (LS01HUFA01b): interpretation2_seasonality: 'JJA' has been replaced by 'Jun-Aug'
d18O (LS01HUFA01b): interpretation2_variable: 'T_water' has been replaced by 'temperature'
Changes made as part of LiPDverse vocabulary standardization process
d18O (LS01HUFA01a): paleoData_longName: '' has been replaced by 'AD'
d18O (LS01HUFA01b): paleoData_longName: '' has been replaced by 'AD'
depth (MAT00f3a744ed): paleoData_longName: '' has been replaced by 'AD'
year (MAT0abffcd25c): paleoData_units: 'AD' has been replaced by 'yr AD'
year (MAT0abffcd25c): paleoData_longName: '' has been replaced by 'AD'
Hu, F. S. , Ito, E. , Brown, T. A. , Curry, B. B. , Engstrom, D. R.
Hu, F. S., Ito, E., Brown, T. A., Curry, B. B. and Engstrom, D. R.: Pronounced climatic variations in Alaska during the last two millennia, Proceedings of the National Academy of Sciences, 98(19), 10552–10556, doi:10.1073/pnas.181333798, 2001.
Proceedings of the National Academy of Sciences
Pronounced climatic variations in Alaska during the last two millennia