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L <- lipdR::readLipd("https://lipdverse.org/data/Sefwzx7SX9ACtwJSfZiA/1_0_5/LS01HUFA.lpd")Report an issue (include datasetId and version)
In compilations: (only most recent versions are shown)
iso2k-1_1_2
archiveType: LakeSediment
originalDataUrl: https://www.ncdc.noaa.gov/paleo/study/10455
lipdVersion: 1.3
author: list(name = "Hu, F. S. , Ito, E. , Brown, T. A. , Curry, B. B. , Engstrom, D. R.")
journal: Proceedings of the National Academy of Sciences
volume: 98
pages: -4
title: Pronounced climatic variations in Alaska during the last two millennia
doi: 10.1073/pnas.181333798
latitude: 62.55
longitude: -153.6333
elevation: 320
siteName: Farewell Lake
TSid: MAT0abffcd25c
variableName: year
units: yr AD
description: Year AD
rank: NA
scope: climate
rank: NA
scope: climate
TSid: MAT00f3a744ed
variableName: depth
units: cm
description: depth
rank: NA
scope: climate
rank: NA
scope: climate
TSid: LS01HUFA01b
variableName: d18O
units: permil
description: carbonate
scope: climate
seasonality: Growing Season
variable: temperature
variableGroup: Temperature
variableGroupDirection: negative
variableGroupOriginal: T
variableOriginal: temperature
rank: NA
scope: climate
scope: climate
basis: Epstein et al., 1953 (GSAB 64:1315)
direction: negative
inferredMaterial: lake water
rank: 1
scope: isotope
seasonality: Jun-Aug
seasonalityOriginal: summer
variable: temperature
variableGroup: Temperature
variableGroupDirection: negative
variableGroupOriginal: T_water
coefficient: NA
fraction: NA
scope: isotope
coefficient: NA
fraction: NA
rank: NA
scope: isotope
coefficient: NA
fraction: NA
rank: NA
TSid: LS01HUFA01a
variableName: d18O
units: permil
description: carbonate
basis: Hypothesised that deep lake temperatures dont change, as recorded by benthic ostracods Thus difference between ostracods and authigenic carbonate relates to temperature
interpDirection: decrease
scope: climate
seasonality: Summer
seasonalityOriginal: summer
variable: temperature
variableDetail: lake water
variableGroup: Temperature
variableGroupDirection: negative
variableGroupOriginal: T
variableOriginal: temperature
scope: climate
scope: climate
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.
direction: negative
inferredMaterial: lake water
integrationTimeUncertaintyType: chronology; hydrology; seasonality; habitat; vital effects
integrationTimeUnits: years
rank: 1
scope: isotope
seasonality: Summer
seasonalityOriginal: summer
variable: effectivePrecipitation
variableGroup: EffectiveMoisture
variableGroupDirection: negative
variableGroupOriginal: P_E
coefficient: NA
fraction: NA
inferredMaterial: lake water
integrationTimeUncertaintyType: chronology; hydrology; seasonality; habitat; vital effects
integrationTimeUnits: years
rank: 2
scope: isotope
variable: precipitationIsotope
variableGroup: P_isotope
variableGroupDirection: positive
variableGroupOriginal: d18Op
coefficient: NA
fraction: NA
scope: isotope
coefficient: NA
fraction: NA
rank: NA
TSid: chron1
variableName: depth
units: cm
description: mid-point 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 g-1
description: 210Pb, 239+240Pu or 137Cs activity
TSid: chron12
variableName: activityUncertainty
units: Bq g-1
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: 210Pb 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 model?
root
pub
pub1
geo
PaleoData columns
year (yr AD)
interpretation
1
2
depth (cm)
interpretation
1
2
d18O (permil)
interpretation
1
2
3
4
5
6
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 g-1)
activityUncertainty (Bq g-1)
supportedActivity ()
x210PbModel ()
210Pb age (yr BP)
SD (yr BP)
reservoirAge14C (yr14C BP)
reservoirAge14CUncertainty (yr14C BP)
useInAgeModel ()