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L <- lipdR::readLipd("https://lipdverse.org/data/Z91GgBMoU3afP65CfdIx/1_0_5/LS09MAAS.lpd")Report an issue (include datasetId and version)
In compilations: (only most recent versions are shown)
iso2k-1_1_1
archiveType: LakeSediment
originalDataUrl: this compilation
lipdVersion: 1.3
author: Marshall, Michael H. , Lamb, Henry F. , Davies, Sarah J. , Leng, Melanie J. , Kubsa, Zelalem , Umer, Mohammed , Bryant, Charlotte
journal: Palaeogeography, Palaeoclimatology, Palaeoecology
volume: 279
pages: 114127
title: Climatic change in northern Ethiopia during the past 17,000degreesyears: A diatom and stable isotope record from Lake Ashenge
doi: 10.1016/j.palaeo.2009.05.003
latitude: 12.5833
longitude: 39.4833
elevation: 2440
siteName: Ashenge
TSid: MAT4af57a079e
variableName: year
units: yr AD
description: Year AD
rank: NA
scope: climate
rank: NA
scope: climate
TSid: MAT9b7da70963
variableName: depth
units: cm
description: depth
rank: NA
scope: climate
rank: NA
scope: climate
TSid: LS09MAAS
variableName: d18O
units: permil
description: carbonate
scope: climate
scope: climate
scope: climate
basis: Where water loss is mainly through evaporation as is likely for Lake Ashenge, the waters tend to have a variable and elevated oxygen isotope composition relative to regional rainfall (which tends to be negative). Measured d18Ocarb values are always higher than those of ambient precipitation as the lighter isotope 16O is preferentially lost to evaporation (Leng et al.,2006)...The isotope records from Ashenge therefore show large swings in composition as the ratio of precipitation to evaporation (P/E) has changed through time
direction: negative
inferredMaterial: lake water
integrationTimeUncertaintyType: chronology, unknown lake residence time
integrationTimeUnits: Years
rank: 1
scope: isotope
variable: effectivePrecipitation
variableGroup: EffectiveMoisture
variableGroupDirection: negative
variableGroupOriginal: P_E
direction: negative
inferredMaterial: Lake water
integrationTimeUncertaintyType: chronology, unknown lake residence time
integrationTimeUnits: Years
rank: 2
scope: isotope
variable: temperature
variableGroup: Temperature
variableGroupDirection: negative
variableGroupOriginal: T_water
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
depth (cm)
interpretation
1
2
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 ()