Finnegan MAT 252 isotope-ratio mass spectrometer connected to a Kiel device
integrationTime "units" given but no time (GF)
We interpret the sedimentary calcite in these cores to be endogenic because (1) there are no significant sources for detrital calcite in the Lake Edward catchment (Bishop, 1969) and (2) the Mg concentration of modern calcite is in rough agreement with equilibrium calculations based on modern lake water (Lehman, 2002).
; archiveType changed - was originally Lake sediment (LS)
The d18O, d13C, and Mg percentage in calcite are highly covariant (Fig. 2), a relationship that indicates that Mg and d18O are strongly controlled by the P/E ratio as opposed to other environmental variables (Talbot, 1990).
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)
chronology in Russell et al 2003b; d18O data only between 1700 BP and 400 BP
year (MAT1c8907d664): interpretation4_scope: '' has been replaced by 'climate'
depth (MAT4e0b49cf47): interpretation4_scope: '' has been replaced by 'climate'
d18O (LS03RUED): paleoData_isPrimary: '' has been replaced by 'FALSE'
d18O (LS03RUED): paleoData_primaryAgeColumn: '' has been replaced by 'FALSE'
year (MAT1c8907d664): paleoData_isPrimary: '' has been replaced by 'TRUE'
year (MAT1c8907d664): paleoData_primaryAgeColumn: '' has been replaced by 'TRUE'
depth (MAT4e0b49cf47): paleoData_isPrimary: '' has been replaced by 'FALSE'
depth (MAT4e0b49cf47): paleoData_primaryAgeColumn: '' has been replaced by 'FALSE'
d18O (LS03RUED): interpretation2_basis: 'The d18O, d13C, and Mg percentage in calcite are highly covariant (Fig. 2), a relationship that indicates that Mg and d18O are strongly controlled by the P/E ratio as opposed to other environmental variables (Talbot, 1990).' has been replaced by ''
d18O (LS03RUED): interpretation2_direction: 'negative' has been replaced by ''
d18O (LS03RUED): interpretation2_inferredMaterial: 'lake water' has been replaced by ''
d18O (LS03RUED): interpretation2_integrationTimeUnits: 'Years' has been replaced by ''
d18O (LS03RUED): interpretation2_rank: '1' has been replaced by ''
d18O (LS03RUED): interpretation2_scope: 'isotope' has been replaced by 'climate'
d18O (LS03RUED): interpretation2_variable: 'effectivePrecipitation' has been replaced by ''
d18O (LS03RUED): interpretation2_variableGroup: 'EffectiveMoisture' has been replaced by ''
d18O (LS03RUED): interpretation2_variableGroupDirection: 'negative' has been replaced by ''
d18O (LS03RUED): interpretation2_variableGroupOriginal: 'P_E' has been replaced by ''
d18O (LS03RUED): interpretation3_direction: 'negative' has been replaced by ''
d18O (LS03RUED): interpretation3_inferredMaterial: 'Lake wtaer' has been replaced by ''
d18O (LS03RUED): interpretation3_integrationTimeUnits: 'Years' has been replaced by ''
d18O (LS03RUED): interpretation3_rank: '2' has been replaced by ''
d18O (LS03RUED): interpretation3_scope: 'isotope' has been replaced by 'climate'
d18O (LS03RUED): interpretation3_variable: 'temperature' has been replaced by ''
d18O (LS03RUED): interpretation3_variableGroup: 'Temperature' has been replaced by ''
d18O (LS03RUED): interpretation3_variableGroupDirection: 'negative' has been replaced by ''
d18O (LS03RUED): interpretation3_variableGroupOriginal: 'T_water' has been replaced by ''
d18O (LS03RUED): interpretation4_basis: '' has been replaced by 'The d18O, d13C, and Mg percentage in calcite are highly covariant (Fig. 2), a relationship that indicates that Mg and d18O are strongly controlled by the P/E ratio as opposed to other environmental variables (Talbot, 1990).'
d18O (LS03RUED): interpretation4_direction: '' has been replaced by 'negative'
d18O (LS03RUED): interpretation4_inferredMaterial: '' has been replaced by 'lake water'
d18O (LS03RUED): interpretation4_integrationTimeUnits: '' has been replaced by 'Years'
d18O (LS03RUED): interpretation4_rank: '' has been replaced by '1'
d18O (LS03RUED): interpretation4_scope: '' has been replaced by 'isotope'
d18O (LS03RUED): interpretation4_variable: '' has been replaced by 'effectivePrecipitation'
d18O (LS03RUED): interpretation4_variableGroup: '' has been replaced by 'EffectiveMoisture'
d18O (LS03RUED): interpretation4_variableGroupDirection: '' has been replaced by 'negative'
d18O (LS03RUED): interpretation4_variableGroupOriginal: '' has been replaced by 'P_E'
d18O (LS03RUED): interpretation5_direction: '' has been replaced by 'negative'
d18O (LS03RUED): interpretation5_inferredMaterial: '' has been replaced by 'Lake wtaer'
d18O (LS03RUED): interpretation5_integrationTimeUnits: '' has been replaced by 'Years'
d18O (LS03RUED): interpretation5_rank: '' has been replaced by '2'
d18O (LS03RUED): interpretation5_scope: '' has been replaced by 'isotope'
d18O (LS03RUED): interpretation5_variable: '' has been replaced by 'temperature'
d18O (LS03RUED): interpretation5_variableGroup: '' has been replaced by 'Temperature'
d18O (LS03RUED): interpretation5_variableGroupDirection: '' has been replaced by 'negative'
d18O (LS03RUED): interpretation5_variableGroupOriginal: '' has been replaced by 'T_water'
d18O (LS03RUED): interpretation6_scope: '' has been replaced by 'isotope'
year (MAT1c8907d664): interpretation1_scope: '' has been replaced by 'climate'
year (MAT1c8907d664): interpretation2_scope: '' has been replaced by 'climate'
year (MAT1c8907d664): interpretation3_scope: '' has been replaced by 'climate'
depth (MAT4e0b49cf47): interpretation1_scope: '' has been replaced by 'climate'
depth (MAT4e0b49cf47): interpretation2_scope: '' has been replaced by 'climate'
depth (MAT4e0b49cf47): interpretation3_scope: '' has been replaced by 'climate'
Updated lipdverse database entry with a changed file.
d18O (LS03RUED): interpretation1_variable: 'Monsoon strength' has been replaced by 'circulationVariable'
d18O (LS03RUED): interpretation2_variable: 'P_E' has been replaced by 'effectivePrecipitation'
d18O (LS03RUED): interpretation3_variable: 'T_water' has been replaced by 'temperature'
Changes made as part of LiPDverse vocabulary standardization process
d18O (LS03RUED): paleoData_longName: '' has been replaced by 'AD'
year (MAT1c8907d664): paleoData_units: 'AD' has been replaced by 'yr AD'
year (MAT1c8907d664): paleoData_longName: '' has been replaced by 'AD'
depth (MAT4e0b49cf47): paleoData_longName: '' has been replaced by 'AD'
Russell, J.M. , Johnson, T.C. , Talbot, M.R.
Russell, J. M., Johnson, T. C. and Talbot, M. R.: A 725 yr cycle in the climate of central Africa during the late Holocene, Geology, 31(8), 677, doi:10.1130/g19449.1, 2003.
A 725 yr cycle in the climate of central Africa during the late Holocene