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L <- lipdR::readLipd("https://lipdverse.org/data/zTTIciYMe1iiv8fjc6Du/1_0_6/LS10CLTA.lpd")Report an issue (include datasetId and version)
In compilations: (only most recent versions are shown)
iso2k-1_1_1
archiveType: LakeSediment
originalDataUrl: https://www.ncdc.noaa.gov/cdo/f?p=519:1:::::P1_STUDY_ID:8663
lipdVersion: 1.3
author: Clegg, B.F. and Hu, F.S.
doi: 10.1016/j.quascirev.2009.12.009
latitude: 67.35
longitude: -153.67
elevation: 275
siteName: Takahula
TSid: MAT178924c724
variableName: year
units: yr AD
description: Year AD
rank: NA
scope: climate
rank: NA
scope: climate
rank: NA
scope: climate
rank: NA
scope: climate
TSid: MATa866d9704a
variableName: depth
units: cm
description: depth
rank: NA
scope: climate
rank: NA
scope: climate
rank: NA
scope: climate
rank: NA
scope: climate
TSid: LS10CLTA
variableName: d18O
units: permil
description: carbonate
basis: 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
direction: decrease
interpDirection: decrease
scope: climate
seasonality: Winter
variable: precipitation
variableDetail: Strength & position of Aleutian low
variableGroup: P
variableOriginal: Precipitation
scope: climate
scope: climate
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.
direction: negative
inferredMaterial: lake water
integrationTime: 12-100
integrationTimeUncertaintyType: chronological
integrationTimeUnits: years
rank: 1
scope: isotope
seasonality: Dec-Feb
variable: effectivePrecipitation
variableGroup: EffectiveMoisture
variableGroupDirection: negative
variableGroupOriginal: P_E
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.
inferredMaterial: lake water
integrationTime: 12-100
integrationTimeUncertaintyType: chronological
integrationTimeUnits: years
mathematicalRelation: decrease
rank: 2
scope: isotope
seasonality: Summer
seasonalityOriginal: summer
variable: effectivePrecipitation
variableGroup: EffectiveMoisture
variableGroupDirection: negative
variableGroupOriginal: P_E
inferredMaterial: lake water
integrationTime: 12-100
integrationTimeUncertaintyType: chronological
integrationTimeUnits: years
scope: isotope
TSid: chron1
variableName: depth
units: cm
description: midpoint depth
TSid: chron2
variableName: age14C
units: yr14C BP
description: 14C years before 1950
TSid: chron3
variableName: SD
units: yr14C BP
description: 14C years uncertainty
TSid: chron4
variableName: fractionModern
description: fraction of modern 14C activity
TSid: chron5
variableName: fractionModernUncertainty
description: fraction of modern 14C activity uncertainty
TSid: chron6
variableName: delta13C
units: permil
description: delta13C of material analyzed for 14C
TSid: chron7
variableName: delta13Cuncertainty
units: permil
description: delta13C uncertainty
TSid: chron8
variableName: thickness
units: cm
description: thickness of sample (along depth axis)
TSid: chron9
variableName: labID
description: laboratory ID from radiocarbon facility
TSid: chron10
variableName: materialDated
description: material analyzed
TSid: chron11
variableName: activity
units: Bq g1
description: 210Pb, 239+240Pu or 137Cs activity
TSid: chron12
variableName: activityUncertainty
units: Bq g1
description: 210Pb, 239+240Pu or 137Cs activity uncertainty
TSid: chron13
variableName: supportedActivity
description: Y if supported 210Pb activity, N if unsupported 210Pb activity
TSid: chron14
variableName: x210PbModel
description: model used to convert 210Pb activity to age (e.g., constant rate of supply)
TSid: chron15
variableName: age
units: yr BP
description: years before 1950 (calibrated age, or ages that dont need calibration)
TSid: chron16
variableName: SD
units: yr BP
description: uncertainty in age
TSid: chron17
variableName: reservoirAge14C
units: yr14C BP
description: 14C reservoir age
TSid: chron18
variableName: reservoirAge14CUncertainty
units: yr14C BP
description: 14C reservoir age uncertainty
TSid: chron19
variableName: useInAgeModel
description: was this date used in the age modelpermil
root
pub
pub1
geo
PaleoData columns
year (yr AD)
interpretation
1
2
3
4
depth (cm)
interpretation
1
2
3
4
d18O (permil)
interpretation
1
2
3
4
5
6
ChronData columns
depth (cm)
age14C (yr14C BP)
SD (yr14C BP)
fractionModern ()
fractionModernUncertainty ()
delta13C (permil)
delta13Cuncertainty (permil)
thickness (cm)
labID ()
materialDated ()
activity (Bq g1)
activityUncertainty (Bq g1)
supportedActivity ()
x210PbModel ()
age (yr BP)
SD (yr BP)
reservoirAge14C (yr14C BP)
reservoirAge14CUncertainty (yr14C BP)
useInAgeModel ()