dual-inlet GV Instruments, Ltd. IsoPrime? stable isotope ratio mass spectrometer equipped with a dual inlet, MultiPrep? module and Gilson autosampler
; archiveType changed - was originally Lake sediment (LS)
Aggregates of ~30 adult ostracod carapaces of the genus Physocypria, with no evidence of corrosion, were isolated from sediment for oxygen isotope analysis at 1?2 cm intervals. Ostracod valves were soaked in 15 % H2O2, cleaned ultrasonically in deionized water, rinsed with methanol and dried at 60�C for 12 hours
More specifi cally, the ostracod-based oxygen isotope record from El Gancho, Nicaragua, indicates that wetter conditions prevailed from as early as ca. A.D. 600 until the end of the MCA, ca. A.D. 1250. An abrupt shift toward arid conditions occurred during the ~150 yr interval between the MCA and the LIA, and was followed by a generally drier climate that has persisted until present
Oxygen isotope values of El Gancho surface water samples are enriched by ~8? relative to local meteoric water (Fig. 3), indicating substantial water loss through both evaporation and nonfractionating outfl ow pathways (i.e., overfl ow and outseepage through the lake bed), and a resulting lake water isotopic sensitivity to changes in hydrologic balance. isotopic and hydrologic modeling supports these assertions, indicating that precipitation [amount] is the principle control on El Gancho lake water !18O values. For example, in response to modeled precipitation changes of i¿½50%, El Gancho exhibited water and ostracod !18O increases of >1.5? and decreases of >1.0?, respectively; largely as a result of hydrologic control of the proportions of water lost through evaporation and overfl ow (Table DR5).
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)
Methodology detail at ftp://rock.geosociety.org/pub/reposit/2013/2013037.pdf
year (MAT12f2b34800): interpretation5_scope: '' has been replaced by 'climate'
depth (MAT7d3f8a3175): interpretation5_scope: '' has been replaced by 'climate'
d18O (LS13STEL): paleoData_isPrimary: '' has been replaced by 'FALSE'
d18O (LS13STEL): paleoData_primaryAgeColumn: '' has been replaced by 'FALSE'
year (MAT12f2b34800): paleoData_isPrimary: '' has been replaced by 'TRUE'
year (MAT12f2b34800): paleoData_primaryAgeColumn: '' has been replaced by 'TRUE'
depth (MAT7d3f8a3175): paleoData_isPrimary: '' has been replaced by 'FALSE'
depth (MAT7d3f8a3175): paleoData_primaryAgeColumn: '' has been replaced by 'FALSE'
d18O (LS13STEL): interpretation2_basis: 'Oxygen isotope values of El Gancho surface water samples are enriched by ~8? relative to local meteoric water (Fig. 3), indicating substantial water loss through both evaporation and nonfractionating outfl ow pathways (i.e., overfl ow and outseepage through the lake bed), and a resulting lake water isotopic sensitivity to changes in hydrologic balance. isotopic and hydrologic modeling supports these assertions, indicating that precipitation [amount] is the principle control on El Gancho lake water !18O values. For example, in response to modeled precipitation changes of i¿½50%, El Gancho exhibited water and ostracod !18O increases of >1.5? and decreases of >1.0?, respectively; largely as a result of hydrologic control of the proportions of water lost through evaporation and overfl ow (Table DR5).' has been replaced by ''
d18O (LS13STEL): interpretation2_direction: 'negative' has been replaced by ''
d18O (LS13STEL): interpretation2_inferredMaterial: 'lake water' has been replaced by ''
d18O (LS13STEL): interpretation2_integrationTimeUnits: 'Years' has been replaced by ''
d18O (LS13STEL): interpretation2_rank: '1' has been replaced by ''
d18O (LS13STEL): interpretation2_scope: 'isotope' has been replaced by 'climate'
d18O (LS13STEL): interpretation2_variable: 'effectivePrecipitation' has been replaced by ''
d18O (LS13STEL): interpretation2_variableGroup: 'EffectiveMoisture' has been replaced by ''
d18O (LS13STEL): interpretation2_variableGroupDirection: 'negative' has been replaced by ''
d18O (LS13STEL): interpretation2_variableGroupOriginal: 'P_E' has been replaced by ''
d18O (LS13STEL): interpretation3_inferredMaterial: 'lake water' has been replaced by ''
d18O (LS13STEL): interpretation3_integrationTimeUnits: 'Years' has been replaced by ''
d18O (LS13STEL): interpretation3_rank: '2' has been replaced by ''
d18O (LS13STEL): interpretation3_scope: 'isotope' has been replaced by 'climate'
d18O (LS13STEL): interpretation3_variable: 'temperature' has been replaced by ''
d18O (LS13STEL): interpretation3_variableGroup: 'Temperature' has been replaced by ''
d18O (LS13STEL): interpretation3_variableGroupDirection: 'negative' has been replaced by ''
d18O (LS13STEL): interpretation3_variableGroupOriginal: 'T_water' has been replaced by ''
d18O (LS13STEL): interpretation4_rank: '3' has been replaced by '1'
d18O (LS13STEL): interpretation4_variable: 'relativeHumidity' has been replaced by 'effectivePrecipitation'
d18O (LS13STEL): interpretation4_variableGroupOriginal: 'RH' has been replaced by 'P_E'
d18O (LS13STEL): interpretation4_basis: '' has been replaced by 'Oxygen isotope values of El Gancho surface water samples are enriched by ~8? relative to local meteoric water (Fig. 3), indicating substantial water loss through both evaporation and nonfractionating outfl ow pathways (i.e., overfl ow and outseepage through the lake bed), and a resulting lake water isotopic sensitivity to changes in hydrologic balance. isotopic and hydrologic modeling supports these assertions, indicating that precipitation [amount] is the principle control on El Gancho lake water !18O values. For example, in response to modeled precipitation changes of i¿½50%, El Gancho exhibited water and ostracod !18O increases of >1.5? and decreases of >1.0?, respectively; largely as a result of hydrologic control of the proportions of water lost through evaporation and overfl ow (Table DR5).'
d18O (LS13STEL): interpretation4_direction: '' has been replaced by 'negative'
d18O (LS13STEL): interpretation5_inferredMaterial: '' has been replaced by 'lake water'
d18O (LS13STEL): interpretation5_integrationTimeUnits: '' has been replaced by 'Years'
d18O (LS13STEL): interpretation5_rank: '' has been replaced by '2'
d18O (LS13STEL): interpretation5_scope: '' has been replaced by 'isotope'
d18O (LS13STEL): interpretation5_variable: '' has been replaced by 'temperature'
d18O (LS13STEL): interpretation5_variableGroup: '' has been replaced by 'Temperature'
d18O (LS13STEL): interpretation5_variableGroupDirection: '' has been replaced by 'negative'
d18O (LS13STEL): interpretation5_variableGroupOriginal: '' has been replaced by 'T_water'
d18O (LS13STEL): interpretation6_inferredMaterial: '' has been replaced by 'lake water'
d18O (LS13STEL): interpretation6_integrationTimeUnits: '' has been replaced by 'Years'
d18O (LS13STEL): interpretation6_rank: '' has been replaced by '3'
d18O (LS13STEL): interpretation6_scope: '' has been replaced by 'isotope'
d18O (LS13STEL): interpretation6_variable: '' has been replaced by 'relativeHumidity'
d18O (LS13STEL): interpretation6_variableGroup: '' has been replaced by 'EffectiveMoisture'
d18O (LS13STEL): interpretation6_variableGroupDirection: '' has been replaced by 'negative'
d18O (LS13STEL): interpretation6_variableGroupOriginal: '' has been replaced by 'RH'
year (MAT12f2b34800): interpretation1_scope: '' has been replaced by 'climate'
year (MAT12f2b34800): interpretation2_scope: '' has been replaced by 'climate'
year (MAT12f2b34800): interpretation3_scope: '' has been replaced by 'climate'
year (MAT12f2b34800): interpretation4_scope: '' has been replaced by 'climate'
depth (MAT7d3f8a3175): interpretation1_scope: '' has been replaced by 'climate'
depth (MAT7d3f8a3175): interpretation2_scope: '' has been replaced by 'climate'
depth (MAT7d3f8a3175): interpretation3_scope: '' has been replaced by 'climate'
depth (MAT7d3f8a3175): interpretation4_scope: '' has been replaced by 'climate'
Updated lipdverse database entry with a changed file.
d18O (LS13STEL): interpretation1_direction: 'increase' has been replaced by 'negative'
d18O (LS13STEL): interpretation1_variable: 'E/P' has been replaced by 'effectivePrecipitation'
d18O (LS13STEL): interpretation2_variable: 'P_E' has been replaced by 'effectivePrecipitation'
d18O (LS13STEL): interpretation3_variable: 'T_water' has been replaced by 'temperature'
d18O (LS13STEL): interpretation4_variable: 'RH' has been replaced by 'relativeHumidity'
Changes made as part of LiPDverse vocabulary standardization process
d18O (LS13STEL): paleoData_longName: '' has been replaced by 'AD'
year (MAT12f2b34800): paleoData_units: 'AD' has been replaced by 'yr AD'
year (MAT12f2b34800): paleoData_longName: '' has been replaced by 'AD'
depth (MAT7d3f8a3175): paleoData_longName: '' has been replaced by 'AD'
Stansell, N. D. , Steinman, B. A. , Abbott, M. B. , Rubinov, M. , Roman-Lacayo, M.
Stansell, N. D., Steinman, B. A., Abbott, M. B., Rubinov, M. and Roman-Lacayo, M.: Lacustrine stable isotope record of precipitation changes in Nicaragua during the Little Ice Age and Medieval Climate Anomaly, Geology, 41(2), 151–154, doi:10.1130/g33736.1, 2013.
Lacustrine stable isotope record of precipitation changes in Nicaragua during the Little Ice Age and Medieval Climate Anomaly