Kiel automated device for isotope ratio mass spectrometry on a Finnigan Delta XL mass ratio spectrometer.
Has 'basis' for isotopeInterpretation3 but no further information
; archiveType changed - was originally Lake sediment (LS)
contiguous 0.5permil1.0cm intervals; analyses, samples were washed through a 109mm mesh, and 15 Charastem encrustations were manually selected from the residue except in samples that yielded fewer stems. The encrustations were bleached in 3% NaOCl solution, rinsed four times in doubly distilled water, airdried, and ground to powder.
The dominant role of winter precipitation (Pw) in the waterbalance of Takahula Lake suggests that the lake should be particularly sensitive to interannual changes in the strength and position of the AL. A westerly AL corresponds to increased moisture delivery into interior Alaska, whereas an easterly AL results in storm systems that cross the Coastal Range and the Alaska Range and cut off winter moisture supply to interior Alaska
These exceptionally low values suggest that factors other than effective moisture must have contributed to the pronounced variations in the Takahula Lake d18O record. Increased winter precipitation associated with a westerly Aleutian Low position may account for 1 permil of the d18O decrease. Other factors leading to the 18O-depletion during these periods probably include decreased temperatures, as well as increased lake-ice cover and associated reductions in evaporation.
A lowering of lake level by 0.5m would turn the lake into a topographically closed basin. Under such conditions, evaporation becomes the main process of water loss, and lake-water continues to become 18Oenriched until d18O of the evaporating vapor equals d18O of the input (Gat and Levy, 1978; Leng and Marshall, 2004). In contrast, a more positive water balance than the present is expected to shorten the lake?s water-residence time, reducing the influence of evaporation on the lake?s isotope composition (Craig, 1961). Thus the d18OCc record can be used to infer qualitative changes in effective moisture.
we employed the model developed by Bowen and Wilkinson (2002) and Bowen and Revenaugh (2003) to estimate the isotope composition of monthly precipitation atTakahula Lake.
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)
was this date used in the age modelpermil
We calculated a regional meteoric water line (RMWL) from precipitation dD and d18O data from Global Network of Isotopes in Precipitation (GNIP) (IAEA/WMO, 2004) sites in Bethel (60 4604800 N, 161 4800000 W), Barrow (71 1800000 N, 156 4604800 W), Mayo (63 2201200 N, 135 3101200 W), and Whitehorse (60 4301200 N, 135 401200 W)'
age (MAT178924c724): interpretation5_scope: '' has been replaced by 'climate'
depth (MATa866d9704a): interpretation5_scope: '' has been replaced by 'climate'
Updated lipdverse database entry with a changed file.
age (MAT178924c724): paleoData_units: 'yr AD' has been replaced by 'yr BP'
age (MAT178924c724): paleoData_variableName: 'year' has been replaced by 'age'
year (MAT178924c724): interpretation4_scope: '' has been replaced by 'climate'
depth (MATa866d9704a): interpretation4_scope: '' has been replaced by 'climate'
d18O (LS10CLTA): paleoData_isPrimary: '' has been replaced by 'FALSE'
d18O (LS10CLTA): paleoData_primaryAgeColumn: '' has been replaced by 'FALSE'
year (MAT178924c724): paleoData_isPrimary: '' has been replaced by 'TRUE'
year (MAT178924c724): paleoData_primaryAgeColumn: '' has been replaced by 'TRUE'
depth (MATa866d9704a): paleoData_isPrimary: '' has been replaced by 'FALSE'
depth (MATa866d9704a): paleoData_primaryAgeColumn: '' has been replaced by 'FALSE'
d18O (LS10CLTA): interpretation2_basis: 'These exceptionally low values suggest that factors other than effective moisture must have contributed to the pronounced variations in the Takahula Lake d18O record. Increased winter precipitation associated with a westerly Aleutian Low position may account for 1 permil of the d18O decrease. Other factors leading to the 18O-depletion during these periods probably include decreased temperatures, as well as increased lake-ice cover and associated reductions in evaporation.' has been replaced by ''
d18O (LS10CLTA): interpretation2_direction: 'negative' has been replaced by ''
d18O (LS10CLTA): interpretation2_inferredMaterial: 'lake water' has been replaced by ''
d18O (LS10CLTA): interpretation2_integrationTime: '12-100' has been replaced by ''
d18O (LS10CLTA): interpretation2_integrationTimeUncertaintyType: 'chronological' has been replaced by ''
d18O (LS10CLTA): interpretation2_integrationTimeUnits: 'years' has been replaced by ''
d18O (LS10CLTA): interpretation2_rank: '1' has been replaced by ''
d18O (LS10CLTA): interpretation2_scope: 'isotope' has been replaced by 'climate'
d18O (LS10CLTA): interpretation2_seasonality: 'Dec-Feb' has been replaced by ''
d18O (LS10CLTA): interpretation2_variable: 'effectivePrecipitation' has been replaced by ''
d18O (LS10CLTA): interpretation2_variableGroup: 'EffectiveMoisture' has been replaced by ''
d18O (LS10CLTA): interpretation2_variableGroupDirection: 'negative' has been replaced by ''
d18O (LS10CLTA): interpretation2_variableGroupOriginal: 'P_E' has been replaced by ''
d18O (LS10CLTA): interpretation3_basis: 'A lowering of lake level by 0.5m would turn the lake into a topographically closed basin. Under such conditions, evaporation becomes the main process of water loss, and lake-water continues to become 18Oenriched until d18O of the evaporating vapor equals d18O of the input (Gat and Levy, 1978; Leng and Marshall, 2004). In contrast, a more positive water balance than the present is expected to shorten the lake?s water-residence time, reducing the influence of evaporation on the lake?s isotope composition (Craig, 1961). Thus the d18OCc record can be used to infer qualitative changes in effective moisture.' has been replaced by ''
d18O (LS10CLTA): interpretation3_inferredMaterial: 'lake water' has been replaced by ''
d18O (LS10CLTA): interpretation3_integrationTime: '12-100' has been replaced by ''
d18O (LS10CLTA): interpretation3_integrationTimeUncertaintyType: 'chronological' has been replaced by ''
d18O (LS10CLTA): interpretation3_integrationTimeUnits: 'years' has been replaced by ''
d18O (LS10CLTA): interpretation3_mathematicalRelation: 'decrease' has been replaced by ''
d18O (LS10CLTA): interpretation3_rank: '2' has been replaced by ''
d18O (LS10CLTA): interpretation3_scope: 'isotope' has been replaced by 'climate'
d18O (LS10CLTA): interpretation3_seasonality: 'Summer' has been replaced by ''
d18O (LS10CLTA): interpretation3_seasonalityOriginal: 'summer' has been replaced by ''
d18O (LS10CLTA): interpretation3_variable: 'effectivePrecipitation' has been replaced by ''
d18O (LS10CLTA): interpretation3_variableGroup: 'EffectiveMoisture' has been replaced by ''
d18O (LS10CLTA): interpretation3_variableGroupDirection: 'negative' has been replaced by ''
d18O (LS10CLTA): interpretation3_variableGroupOriginal: 'P_E' has been replaced by ''
d18O (LS10CLTA): interpretation4_basis: '' has been replaced by 'These exceptionally low values suggest that factors other than effective moisture must have contributed to the pronounced variations in the Takahula Lake d18O record. Increased winter precipitation associated with a westerly Aleutian Low position may account for 1 permil of the d18O decrease. Other factors leading to the 18O-depletion during these periods probably include decreased temperatures, as well as increased lake-ice cover and associated reductions in evaporation.'
d18O (LS10CLTA): interpretation4_direction: '' has been replaced by 'negative'
d18O (LS10CLTA): interpretation4_rank: '' has been replaced by '1'
d18O (LS10CLTA): interpretation4_seasonality: '' has been replaced by 'Dec-Feb'
d18O (LS10CLTA): interpretation4_variable: '' has been replaced by 'effectivePrecipitation'
d18O (LS10CLTA): interpretation4_variableGroup: '' has been replaced by 'EffectiveMoisture'
d18O (LS10CLTA): interpretation4_variableGroupDirection: '' has been replaced by 'negative'
d18O (LS10CLTA): interpretation4_variableGroupOriginal: '' has been replaced by 'P_E'
d18O (LS10CLTA): interpretation5_basis: '' has been replaced by 'A lowering of lake level by 0.5m would turn the lake into a topographically closed basin. Under such conditions, evaporation becomes the main process of water loss, and lake-water continues to become 18Oenriched until d18O of the evaporating vapor equals d18O of the input (Gat and Levy, 1978; Leng and Marshall, 2004). In contrast, a more positive water balance than the present is expected to shorten the lake?s water-residence time, reducing the influence of evaporation on the lake?s isotope composition (Craig, 1961). Thus the d18OCc record can be used to infer qualitative changes in effective moisture.'
d18O (LS10CLTA): interpretation5_inferredMaterial: '' has been replaced by 'lake water'
d18O (LS10CLTA): interpretation5_integrationTime: '' has been replaced by '12-100'
d18O (LS10CLTA): interpretation5_integrationTimeUncertaintyType: '' has been replaced by 'chronological'
d18O (LS10CLTA): interpretation5_integrationTimeUnits: '' has been replaced by 'years'
d18O (LS10CLTA): interpretation5_mathematicalRelation: '' has been replaced by 'decrease'
d18O (LS10CLTA): interpretation5_rank: '' has been replaced by '2'
d18O (LS10CLTA): interpretation5_scope: '' has been replaced by 'isotope'
d18O (LS10CLTA): interpretation5_seasonality: '' has been replaced by 'Summer'
d18O (LS10CLTA): interpretation5_seasonalityOriginal: '' has been replaced by 'summer'
d18O (LS10CLTA): interpretation5_variable: '' has been replaced by 'effectivePrecipitation'
d18O (LS10CLTA): interpretation5_variableGroup: '' has been replaced by 'EffectiveMoisture'
d18O (LS10CLTA): interpretation5_variableGroupDirection: '' has been replaced by 'negative'
d18O (LS10CLTA): interpretation5_variableGroupOriginal: '' has been replaced by 'P_E'
d18O (LS10CLTA): interpretation6_inferredMaterial: '' has been replaced by 'lake water'
d18O (LS10CLTA): interpretation6_integrationTime: '' has been replaced by '12-100'
d18O (LS10CLTA): interpretation6_integrationTimeUncertaintyType: '' has been replaced by 'chronological'
d18O (LS10CLTA): interpretation6_integrationTimeUnits: '' has been replaced by 'years'
d18O (LS10CLTA): interpretation6_scope: '' has been replaced by 'isotope'
year (MAT178924c724): interpretation1_scope: '' has been replaced by 'climate'
year (MAT178924c724): interpretation2_scope: '' has been replaced by 'climate'
year (MAT178924c724): interpretation3_scope: '' has been replaced by 'climate'
depth (MATa866d9704a): interpretation1_scope: '' has been replaced by 'climate'
depth (MATa866d9704a): interpretation2_scope: '' has been replaced by 'climate'
depth (MATa866d9704a): interpretation3_scope: '' has been replaced by 'climate'
d18O (LS10CLTA): interpretation1_seasonality: 'winter' has been replaced by 'Winter'
d18O (LS10CLTA): interpretation1_variable: 'P' has been replaced by 'precipitation'
d18O (LS10CLTA): interpretation2_seasonality: 'DJF' has been replaced by 'Dec-Feb'
d18O (LS10CLTA): interpretation2_variable: 'P_E' has been replaced by 'effectivePrecipitation'
d18O (LS10CLTA): interpretation3_variable: 'P_E' has been replaced by 'effectivePrecipitation'
Changes made as part of LiPDverse vocabulary standardization process
d18O (LS10CLTA): paleoData_longName: '' has been replaced by 'AD'
year (MAT178924c724): paleoData_units: 'AD' has been replaced by 'yr AD'
year (MAT178924c724): paleoData_longName: '' has been replaced by 'AD'
depth (MATa866d9704a): paleoData_longName: '' has been replaced by 'AD'
Clegg, B. F. and Hu, F. S.: An oxygen-isotope record of Holocene climate change in the south-central Brooks Range, Alaska, Quaternary Science Reviews, 29(7-8), 928–939, doi:10.1016/j.quascirev.2009.12.009, 2010.