VG Isocarb preparation system. Isotopic ratios of purified CO2 gas were measured on-line by a triple-collector VG Prism Series II mass spectrometer
; archiveType changed - was originally Lake sediment (LS)
DK: Most complete of three ostracode species analyzed.
For stable isotope analysis, each 1 cm subsample was disaggregated by soaking in 3% H2O2 and subsequently sieved at 250 mm. The .250 mm fraction was collected on filter paper, dried at 60�C and transferred to glass scintillation vials. Ostracods and gastropods were separated from the matrix using a dissecting microscope at 10 � magnification. Adult specimens of the ostracod Cytheridella boldi were picked from the sieved 425?500 mm fraction, Heterocypris communis were picked from the 351?500 mm fraction, and Cypria obtusa were picked from the 250?300 mm fraction. Specimens of the gastropod Pyrgophorus sp. were separated from the sieved .1000 mm fraction. Ostracod valves were cleaned of organic material using 15% H2O2, then washed in deionized water, rinsed in methanol, and dried. Gastropods were cleaned in the same manner, except that specimens were cleaned further by sonication. Samples consisting of many monospecific ostracod carapaces (|15 C. boldi, |20 H. communis, |25 C. obtusa) were loaded into a stainless-steel carrying boat, crushed with a glass rod dipped in methanol and allowed to dry overnight. Numerous monospecific ostracod valves were used to constitute a sample to reduce variance that might result from running single, short-lived individuals whose isotopic signatures might reflect short-term (i.e., seasonal) water-column temperature and salinity conditions (Heaton et al., 1995)
Lake level also important as lake not always closed but Since ,3000 14C yr BP the level of Lake Valencia has been dropping. Lake closed in present day, but last 2k isotoeps realtively fresh suggesting more open system?
DK: Reject and defer to ostracode-based timeseries. Good for replication
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)
One ostracod species used here but other shell typrsd show similar trends with values offset with a smaller range
d18O (LS99CUVAa): paleoData_isPrimary: '' has been replaced by 'FALSE'
d18O (LS99CUVAa): paleoData_primaryAgeColumn: '' has been replaced by 'FALSE'
d18O (LS99CUVAb): paleoData_isPrimary: '' has been replaced by 'FALSE'
d18O (LS99CUVAb): paleoData_primaryAgeColumn: '' has been replaced by 'FALSE'
d18O (LS99CUVAc): paleoData_isPrimary: '' has been replaced by 'FALSE'
d18O (LS99CUVAc): paleoData_primaryAgeColumn: '' has been replaced by 'FALSE'
depth (MAT453770a586): paleoData_isPrimary: '' has been replaced by 'FALSE'
depth (MAT453770a586): paleoData_primaryAgeColumn: '' has been replaced by 'FALSE'
year (MATe80b9fa4c1): paleoData_isPrimary: '' has been replaced by 'TRUE'
year (MATe80b9fa4c1): paleoData_primaryAgeColumn: '' has been replaced by 'TRUE'
d18O (LS99CUVAa): interpretation1_basis: 'Lake level also important as lake not always closed but Since ,3000 14C yr BP the level of Lake Valencia has been dropping. Lake closed in present day, but last 2k isotoeps realtively fresh suggesting more open system?' has been replaced by ''
d18O (LS99CUVAa): interpretation1_direction: 'negative' has been replaced by ''
d18O (LS99CUVAa): interpretation1_inferredMaterial: 'lake water' has been replaced by ''
d18O (LS99CUVAa): interpretation1_integrationTimeUnits: 'years' has been replaced by ''
d18O (LS99CUVAa): interpretation1_rank: '1' has been replaced by ''
d18O (LS99CUVAa): interpretation1_scope: 'isotope' has been replaced by 'climate'
d18O (LS99CUVAa): interpretation1_variable: 'effectivePrecipitation' has been replaced by ''
d18O (LS99CUVAa): interpretation1_variableGroup: 'EffectiveMoisture' has been replaced by ''
d18O (LS99CUVAa): interpretation1_variableGroupDirection: 'negative' has been replaced by ''
d18O (LS99CUVAa): interpretation1_variableGroupOriginal: 'P_E' has been replaced by ''
d18O (LS99CUVAa): interpretation2_inferredMaterial: 'lake water' has been replaced by ''
d18O (LS99CUVAa): interpretation2_integrationTimeUnits: 'years' has been replaced by ''
d18O (LS99CUVAa): interpretation2_rank: '2' has been replaced by ''
d18O (LS99CUVAa): interpretation2_scope: 'isotope' has been replaced by 'climate'
d18O (LS99CUVAa): interpretation2_variable: 'temperature' has been replaced by ''
d18O (LS99CUVAa): interpretation2_variableGroup: 'Temperature' has been replaced by ''
d18O (LS99CUVAa): interpretation2_variableGroupDirection: 'negative' has been replaced by ''
d18O (LS99CUVAa): interpretation2_variableGroupOriginal: 'T' has been replaced by ''
d18O (LS99CUVAa): interpretation2_variableOriginal: 'temperature' has been replaced by ''
d18O (LS99CUVAa): interpretation3_scope: '' has been replaced by 'climate'
d18O (LS99CUVAa): interpretation4_basis: '' has been replaced by 'Lake level also important as lake not always closed but Since ,3000 14C yr BP the level of Lake Valencia has been dropping. Lake closed in present day, but last 2k isotoeps realtively fresh suggesting more open system?'
d18O (LS99CUVAa): interpretation4_direction: '' has been replaced by 'negative'
d18O (LS99CUVAa): interpretation4_inferredMaterial: '' has been replaced by 'lake water'
d18O (LS99CUVAa): interpretation4_integrationTimeUnits: '' has been replaced by 'years'
d18O (LS99CUVAa): interpretation4_rank: '' has been replaced by '1'
d18O (LS99CUVAa): interpretation4_scope: '' has been replaced by 'isotope'
d18O (LS99CUVAa): interpretation4_variable: '' has been replaced by 'effectivePrecipitation'
d18O (LS99CUVAa): interpretation4_variableGroup: '' has been replaced by 'EffectiveMoisture'
d18O (LS99CUVAa): interpretation4_variableGroupDirection: '' has been replaced by 'negative'
d18O (LS99CUVAa): interpretation4_variableGroupOriginal: '' has been replaced by 'P_E'
d18O (LS99CUVAa): interpretation5_inferredMaterial: '' has been replaced by 'lake water'
d18O (LS99CUVAa): interpretation5_integrationTimeUnits: '' has been replaced by 'years'
d18O (LS99CUVAa): interpretation5_rank: '' has been replaced by '2'
d18O (LS99CUVAa): interpretation5_scope: '' has been replaced by 'isotope'
d18O (LS99CUVAa): interpretation5_variable: '' has been replaced by 'temperature'
d18O (LS99CUVAa): interpretation5_variableGroup: '' has been replaced by 'Temperature'
d18O (LS99CUVAa): interpretation5_variableGroupDirection: '' has been replaced by 'negative'
d18O (LS99CUVAa): interpretation5_variableGroupOriginal: '' has been replaced by 'T'
d18O (LS99CUVAa): interpretation5_variableOriginal: '' has been replaced by 'temperature'
d18O (LS99CUVAa): interpretation6_scope: '' has been replaced by 'isotope'
d18O (LS99CUVAb): interpretation1_basis: 'Lake level also important as lake not always closed but Since ,3000 14C yr BP the level of Lake Valencia has been dropping. Lake closed in present day, but last 2k isotoeps realtively fresh suggesting more open system?' has been replaced by ''
d18O (LS99CUVAb): interpretation1_direction: 'negative' has been replaced by ''
d18O (LS99CUVAb): interpretation1_inferredMaterial: 'lake water' has been replaced by ''
d18O (LS99CUVAb): interpretation1_integrationTimeUnits: 'years' has been replaced by ''
d18O (LS99CUVAb): interpretation1_rank: '1' has been replaced by ''
d18O (LS99CUVAb): interpretation1_scope: 'isotope' has been replaced by 'climate'
d18O (LS99CUVAb): interpretation1_variable: 'effectivePrecipitation' has been replaced by ''
d18O (LS99CUVAb): interpretation1_variableGroup: 'EffectiveMoisture' has been replaced by ''
d18O (LS99CUVAb): interpretation1_variableGroupDirection: 'negative' has been replaced by ''
d18O (LS99CUVAb): interpretation1_variableGroupOriginal: 'P_E' has been replaced by ''
d18O (LS99CUVAb): interpretation2_inferredMaterial: 'lake water' has been replaced by ''
d18O (LS99CUVAb): interpretation2_integrationTimeUnits: 'years' has been replaced by ''
d18O (LS99CUVAb): interpretation2_rank: '2' has been replaced by ''
d18O (LS99CUVAb): interpretation2_scope: 'isotope' has been replaced by 'climate'
d18O (LS99CUVAb): interpretation2_variable: 'temperature' has been replaced by ''
d18O (LS99CUVAb): interpretation2_variableGroup: 'Temperature' has been replaced by ''
d18O (LS99CUVAb): interpretation2_variableGroupDirection: 'negative' has been replaced by ''
d18O (LS99CUVAb): interpretation2_variableGroupOriginal: 'T' has been replaced by ''
d18O (LS99CUVAb): interpretation2_variableOriginal: 'temperature' has been replaced by ''
d18O (LS99CUVAb): interpretation3_scope: '' has been replaced by 'climate'
d18O (LS99CUVAb): interpretation4_basis: '' has been replaced by 'Lake level also important as lake not always closed but Since ,3000 14C yr BP the level of Lake Valencia has been dropping. Lake closed in present day, but last 2k isotoeps realtively fresh suggesting more open system?'
d18O (LS99CUVAb): interpretation4_direction: '' has been replaced by 'negative'
d18O (LS99CUVAb): interpretation4_inferredMaterial: '' has been replaced by 'lake water'
d18O (LS99CUVAb): interpretation4_integrationTimeUnits: '' has been replaced by 'years'
d18O (LS99CUVAb): interpretation4_rank: '' has been replaced by '1'
d18O (LS99CUVAb): interpretation4_scope: '' has been replaced by 'isotope'
d18O (LS99CUVAb): interpretation4_variable: '' has been replaced by 'effectivePrecipitation'
d18O (LS99CUVAb): interpretation4_variableGroup: '' has been replaced by 'EffectiveMoisture'
d18O (LS99CUVAb): interpretation4_variableGroupDirection: '' has been replaced by 'negative'
d18O (LS99CUVAb): interpretation4_variableGroupOriginal: '' has been replaced by 'P_E'
d18O (LS99CUVAb): interpretation5_inferredMaterial: '' has been replaced by 'lake water'
d18O (LS99CUVAb): interpretation5_integrationTimeUnits: '' has been replaced by 'years'
d18O (LS99CUVAb): interpretation5_rank: '' has been replaced by '2'
d18O (LS99CUVAb): interpretation5_scope: '' has been replaced by 'isotope'
d18O (LS99CUVAb): interpretation5_variable: '' has been replaced by 'temperature'
d18O (LS99CUVAb): interpretation5_variableGroup: '' has been replaced by 'Temperature'
d18O (LS99CUVAb): interpretation5_variableGroupDirection: '' has been replaced by 'negative'
d18O (LS99CUVAb): interpretation5_variableGroupOriginal: '' has been replaced by 'T'
d18O (LS99CUVAb): interpretation5_variableOriginal: '' has been replaced by 'temperature'
d18O (LS99CUVAb): interpretation6_scope: '' has been replaced by 'isotope'
d18O (LS99CUVAc): interpretation1_basis: 'Lake level also important as lake not always closed but Since ,3000 14C yr BP the level of Lake Valencia has been dropping. Lake closed in present day, but last 2k isotoeps realtively fresh suggesting more open system?' has been replaced by ''
d18O (LS99CUVAc): interpretation1_direction: 'negative' has been replaced by ''
d18O (LS99CUVAc): interpretation1_inferredMaterial: 'lake water' has been replaced by ''
d18O (LS99CUVAc): interpretation1_integrationTimeUnits: 'years' has been replaced by ''
d18O (LS99CUVAc): interpretation1_rank: '1' has been replaced by ''
d18O (LS99CUVAc): interpretation1_scope: 'isotope' has been replaced by 'climate'
d18O (LS99CUVAc): interpretation1_variable: 'effectivePrecipitation' has been replaced by ''
d18O (LS99CUVAc): interpretation1_variableGroup: 'EffectiveMoisture' has been replaced by ''
d18O (LS99CUVAc): interpretation1_variableGroupDirection: 'negative' has been replaced by ''
d18O (LS99CUVAc): interpretation1_variableGroupOriginal: 'P_E' has been replaced by ''
d18O (LS99CUVAc): interpretation2_inferredMaterial: 'lake water' has been replaced by ''
d18O (LS99CUVAc): interpretation2_integrationTimeUnits: 'years' has been replaced by ''
d18O (LS99CUVAc): interpretation2_rank: '2' has been replaced by ''
d18O (LS99CUVAc): interpretation2_scope: 'isotope' has been replaced by 'climate'
d18O (LS99CUVAc): interpretation2_variable: 'temperature' has been replaced by ''
d18O (LS99CUVAc): interpretation2_variableGroup: 'Temperature' has been replaced by ''
d18O (LS99CUVAc): interpretation2_variableGroupDirection: 'negative' has been replaced by ''
d18O (LS99CUVAc): interpretation2_variableGroupOriginal: 'T' has been replaced by ''
d18O (LS99CUVAc): interpretation2_variableOriginal: 'temperature' has been replaced by ''
d18O (LS99CUVAc): interpretation3_scope: '' has been replaced by 'climate'
d18O (LS99CUVAc): interpretation4_basis: '' has been replaced by 'Lake level also important as lake not always closed but Since ,3000 14C yr BP the level of Lake Valencia has been dropping. Lake closed in present day, but last 2k isotoeps realtively fresh suggesting more open system?'
d18O (LS99CUVAc): interpretation4_direction: '' has been replaced by 'negative'
d18O (LS99CUVAc): interpretation4_inferredMaterial: '' has been replaced by 'lake water'
d18O (LS99CUVAc): interpretation4_integrationTimeUnits: '' has been replaced by 'years'
d18O (LS99CUVAc): interpretation4_rank: '' has been replaced by '1'
d18O (LS99CUVAc): interpretation4_scope: '' has been replaced by 'isotope'
d18O (LS99CUVAc): interpretation4_variable: '' has been replaced by 'effectivePrecipitation'
d18O (LS99CUVAc): interpretation4_variableGroup: '' has been replaced by 'EffectiveMoisture'
d18O (LS99CUVAc): interpretation4_variableGroupDirection: '' has been replaced by 'negative'
d18O (LS99CUVAc): interpretation4_variableGroupOriginal: '' has been replaced by 'P_E'
d18O (LS99CUVAc): interpretation5_inferredMaterial: '' has been replaced by 'lake water'
d18O (LS99CUVAc): interpretation5_integrationTimeUnits: '' has been replaced by 'years'
d18O (LS99CUVAc): interpretation5_rank: '' has been replaced by '2'
d18O (LS99CUVAc): interpretation5_scope: '' has been replaced by 'isotope'
d18O (LS99CUVAc): interpretation5_variable: '' has been replaced by 'temperature'
d18O (LS99CUVAc): interpretation5_variableGroup: '' has been replaced by 'Temperature'
d18O (LS99CUVAc): interpretation5_variableGroupDirection: '' has been replaced by 'negative'
d18O (LS99CUVAc): interpretation5_variableGroupOriginal: '' has been replaced by 'T'
d18O (LS99CUVAc): interpretation5_variableOriginal: '' has been replaced by 'temperature'
d18O (LS99CUVAc): interpretation6_scope: '' has been replaced by 'isotope'
depth (MAT453770a586): interpretation1_scope: '' has been replaced by 'climate'
depth (MAT453770a586): interpretation2_scope: '' has been replaced by 'climate'
year (MATe80b9fa4c1): interpretation1_scope: '' has been replaced by 'climate'
year (MATe80b9fa4c1): interpretation2_scope: '' has been replaced by 'climate'
Updated lipdverse database entry with a changed file.
d18O (LS99CUVAa): interpretation1_variable: 'P_E' has been replaced by 'effectivePrecipitation'
d18O (LS99CUVAa): interpretation2_variable: 'T' has been replaced by 'temperature'
d18O (LS99CUVAb): interpretation1_variable: 'P_E' has been replaced by 'effectivePrecipitation'
d18O (LS99CUVAb): interpretation2_variable: 'T' has been replaced by 'temperature'
d18O (LS99CUVAc): interpretation1_variable: 'P_E' has been replaced by 'effectivePrecipitation'
d18O (LS99CUVAc): interpretation2_variable: 'T' has been replaced by 'temperature'
Column 'R6kAkP1L2OfPPZj03', with variable name 'reject', was added to the dataset
Column 'LS99CUVA-chron-NA1', with variable name 'reject', was removed from the dataset
Changes made as part of LiPDverse vocabulary standardization process
d18O (LS99CUVAa): paleoData_longName: '' has been replaced by 'AD'
d18O (LS99CUVAb): paleoData_longName: '' has been replaced by 'AD'
d18O (LS99CUVAc): paleoData_longName: '' has been replaced by 'AD'
depth (MAT453770a586): paleoData_longName: '' has been replaced by 'AD'
year (MATe80b9fa4c1): paleoData_units: 'AD' has been replaced by 'yr AD'
year (MATe80b9fa4c1): paleoData_longName: '' has been replaced by 'AD'
Curtis, J.H. , Hodell, D.A. , Brenner, M.
Curtis, J. H., Brenner, M. and Hodell, D. A.: Climate change in the Lake Valencia Basin, Venezuela, ~12600 yr BP to present, The Holocene, 9(5), 609–619, doi:10.1191/095968399669724431, 1999.
Climate change in the Lake Valencia Basin, Venezuela, |12600 yr BP to present