NA; paleoData_isPrimary has been standardized
NA; paleoData_summaryStatistic has been standardized; paleoData_inferredMaterial has been standardized; paleoData_datum has been standardized
NA; paleoData_summaryStatistic has been standardized; paleoData_inferredMaterial has been standardized
NA; paleoData_isPrimary has been standardized; paleoData_datum has been standardized
"We interpret changes in d18O as indicative of changes in the ratio of evaporation and precipitation (E/P). An increase in the evaporation relative to precipitation increases the 18O content of lakewater: H218O tends to evaporate more slowly than H216O, and the higher 16O content of atmospheric water vapor means that 16O is preferentially returned to the lake in precipitation (47). A higher (lower) ratio of evaporation to precipitation would therefore result in higher (lower) d18O"
"We interpret the mass % of Al2O3 as an indicator of input of plagioclase and secondary clay minerals from the maar slope walls into the lake system. The flux of Al increases during wet conditions, when enhanced slopewash transports terrigenous material into the lake system"
Length <4000yrs, but reasonable to include.
NA; paleoData_method has been standardized
originalDataUrl: 'https://www.ncei.noaa.gov/access/paleo-search/study/17735' has been replaced by 'https://doi.org/10.25921/27zc-fs42'
Al2O3 (WEBfa22dabc): paleoData_proxy: '((( mineralogy ))) deleteMe /// Al2O3' has been replaced by 'Al2O3'
Al2O3 (WEBfa22dabc): paleoData_proxy: 'Al2O3' has been replaced by '((( mineralogy ))) deleteMe /// Al2O3'
d18O (WEB4ef1e8b8): paleoData_notes: '((( ((( "We interpret changes in ��18O as indicative of changes in the ratio of evaporation and precipitation (E/P). An increase in the evaporation relative to precipitation increases the 18O content of lakewater: H218O tends to evaporate more slowly than H216O, and the higher 16O content of atmospheric water vapor means that 16O is preferentially returned to the lake in precipitation (47). A higher (lower) ratio of evaporation to precipitation would therefore result in higher (lower) ��18O"; paleoData_units updated ))) "We interpret changes in δ18O as indicative of changes in the ratio of evaporation and precipitation (E/P). An increase in the evaporation relative to precipitation increases the 18O content of lakewater: H218O tends to evaporate more slowly than H216O, and the higher 16O content of atmospheric water vapor means that 16O is preferentially returned to the lake in precipitation (47). A higher (lower) ratio of evaporation to precipitation would therefore result in higher (lower) δ18O" /// "We interpret changes in δ18O as indicative of changes in the ratio of evaporation and precipitation (E/P). An increase in the evaporation relative to precipitation increases the 18O content of lakewater: H218O tends to evaporate more slowly than H216O, and the higher 16O content of atmospheric water vapor means that 16O is preferentially returned to the lake in precipitation (47). A higher (lower) ratio of evaporation to precipitation would therefore result in higher (lower) δ18O" ))) "We interpret changes in d18O as indicative of changes in the ratio of evaporation and precipitation (E/P). An increase in the evaporation relative to precipitation increases the 18O content of lakewater: H218O tends to evaporate more slowly than H216O, and the higher 16O content of atmospheric water vapor means that 16O is preferentially returned to the lake in precipitation (47). A higher (lower) ratio of evaporation to precipitation would therefore result in higher (lower) d18O" /// "We interpret changes in δ18O as indicative of changes in the ratio of evaporation and precipitation (E/P). An increase in the evaporation relative to precipitation increases the 18O content of lakewater: H218O tends to evaporate more slowly than H216O, and the higher 16O content of atmospheric water vapor means that 16O is preferentially returned to the lake in precipitation (47). A higher (lower) ratio of evaporation to precipitation would therefore result in higher (lower) δ18O"' has been replaced by '"We interpret changes in d18O as indicative of changes in the ratio of evaporation and precipitation (E/P). An increase in the evaporation relative to precipitation increases the 18O content of lakewater: H218O tends to evaporate more slowly than H216O, and the higher 16O content of atmospheric water vapor means that 16O is preferentially returned to the lake in precipitation (47). A higher (lower) ratio of evaporation to precipitation would therefore result in higher (lower) d18O"'
d18O (WEB4ef1e8b8): paleoData_notes: '"We interpret changes in δ18O as indicative of changes in the ratio of evaporation and precipitation (E/P). An increase in the evaporation relative to precipitation increases the 18O content of lakewater: H218O tends to evaporate more slowly than H216O, and the higher 16O content of atmospheric water vapor means that 16O is preferentially returned to the lake in precipitation (47). A higher (lower) ratio of evaporation to precipitation would therefore result in higher (lower) δ18O"' has been replaced by '((( ((( "We interpret changes in ��18O as indicative of changes in the ratio of evaporation and precipitation (E/P). An increase in the evaporation relative to precipitation increases the 18O content of lakewater: H218O tends to evaporate more slowly than H216O, and the higher 16O content of atmospheric water vapor means that 16O is preferentially returned to the lake in precipitation (47). A higher (lower) ratio of evaporation to precipitation would therefore result in higher (lower) ��18O"; paleoData_units updated ))) "We interpret changes in δ18O as indicative of changes in the ratio of evaporation and precipitation (E/P). An increase in the evaporation relative to precipitation increases the 18O content of lakewater: H218O tends to evaporate more slowly than H216O, and the higher 16O content of atmospheric water vapor means that 16O is preferentially returned to the lake in precipitation (47). A higher (lower) ratio of evaporation to precipitation would therefore result in higher (lower) δ18O" /// "We interpret changes in δ18O as indicative of changes in the ratio of evaporation and precipitation (E/P). An increase in the evaporation relative to precipitation increases the 18O content of lakewater: H218O tends to evaporate more slowly than H216O, and the higher 16O content of atmospheric water vapor means that 16O is preferentially returned to the lake in precipitation (47). A higher (lower) ratio of evaporation to precipitation would therefore result in higher (lower) δ18O" ))) "We interpret changes in d18O as indicative of changes in the ratio of evaporation and precipitation (E/P). An increase in the evaporation relative to precipitation increases the 18O content of lakewater: H218O tends to evaporate more slowly than H216O, and the higher 16O content of atmospheric water vapor means that 16O is preferentially returned to the lake in precipitation (47). A higher (lower) ratio of evaporation to precipitation would therefore result in higher (lower) d18O" /// "We interpret changes in δ18O as indicative of changes in the ratio of evaporation and precipitation (E/P). An increase in the evaporation relative to precipitation increases the 18O content of lakewater: H218O tends to evaporate more slowly than H216O, and the higher 16O content of atmospheric water vapor means that 16O is preferentially returned to the lake in precipitation (47). A higher (lower) ratio of evaporation to precipitation would therefore result in higher (lower) δ18O"'
d18O (WEB4ef1e8b8): paleoData_QCCertification: 'CH' has been replaced by 'CH, CR'
Al2O3 (WEBfa22dabc): paleoData_notes: 'We interpret the mass % of Al2O3 as an indicator of input of plagioclase and secondary clay minerals from the maar slope walls into the lake system. The flux of Al increases during wet conditions, when enhanced slopewash transports terrigenous material into the lake system' has been replaced by '"We interpret the mass % of Al2O3 as an indicator of input of plagioclase and secondary clay minerals from the maar slope walls into the lake system. The flux of Al increases during wet conditions, when enhanced slopewash transports terrigenous material into the lake system"'
Al2O3 (WEBfa22dabc): paleoData_proxyGeneral: 'biophysical' has been replaced by 'mineral'
Al2O3 (WEBfa22dabc): paleoData_QCCertification: '' has been replaced by 'CR'
Al2O3 (WEBfa22dabc): paleoData_QCnotes: 'Length <4000yrs' has been replaced by 'Length <4000yrs, but reasonable to include.'
d18O (WEB4ef1e8b8): interpretation1_variableDetail: 'lake@surface' has been replaced by '@surface'
Al2O3 (WEBfa22dabc): interpretation1_direction: 'negative' has been replaced by 'positive'
Al2O3 (WEBfa22dabc): interpretation1_seasonality: '' has been replaced by 'Annual'
Al2O3 (WEBfa22dabc): interpretation1_seasonalityGeneral: '' has been replaced by 'Annual'
d18O (WEB4ef1e8b8): paleoData_notes: '((( "We interpret changes in ��18O as indicative of changes in the ratio of evaporation and precipitation (E/P). An increase in the evaporation relative to precipitation increases the 18O content of lakewater: H218O tends to evaporate more slowly than H216O, and the higher 16O content of atmospheric water vapor means that 16O is preferentially returned to the lake in precipitation (47). A higher (lower) ratio of evaporation to precipitation would therefore result in higher (lower) ��18O"; paleoData_units updated ))) "We interpret changes in δ18O as indicative of changes in the ratio of evaporation and precipitation (E/P). An increase in the evaporation relative to precipitation increases the 18O content of lakewater: H218O tends to evaporate more slowly than H216O, and the higher 16O content of atmospheric water vapor means that 16O is preferentially returned to the lake in precipitation (47). A higher (lower) ratio of evaporation to precipitation would therefore result in higher (lower) δ18O" /// "We interpret changes in δ18O as indicative of changes in the ratio of evaporation and precipitation (E/P). An increase in the evaporation relative to precipitation increases the 18O content of lakewater: H218O tends to evaporate more slowly than H216O, and the higher 16O content of atmospheric water vapor means that 16O is preferentially returned to the lake in precipitation (47). A higher (lower) ratio of evaporation to precipitation would therefore result in higher (lower) δ18O"' has been replaced by '"We interpret changes in δ18O as indicative of changes in the ratio of evaporation and precipitation (E/P). An increase in the evaporation relative to precipitation increases the 18O content of lakewater: H218O tends to evaporate more slowly than H216O, and the higher 16O content of atmospheric water vapor means that 16O is preferentially returned to the lake in precipitation (47). A higher (lower) ratio of evaporation to precipitation would therefore result in higher (lower) δ18O"'
d18O (WEB4ef1e8b8): paleoData_proxyGeneral: 'isotope' has been replaced by 'isotopic'
d13C (WEB5d337c69): paleoData_proxyGeneral: 'isotope' has been replaced by 'isotopic'
Al2O3 (WEBfa22dabc): paleoData_proxy: '' has been replaced by 'Al2O3'
d18O (WEB4ef1e8b8): interpretation1_variable: 'P-E' has been replaced by 'effectivePrecipitation'
Al2O3 (WEBfa22dabc): interpretation1_variable: 'P-E' has been replaced by 'effectivePrecipitation'
Al2O3 (WEBfa22dabc): interpretation1_variableDetail: '' has been replaced by 'runoff@catchment'
d18O (WEB4ef1e8b8): paleoData_notes: '"We interpret changes in δ18O as indicative of changes in the ratio of evaporation and precipitation (E/P). An increase in the evaporation relative to precipitation increases the 18O content of lakewater: H218O tends to evaporate more slowly than H216O, and the higher 16O content of atmospheric water vapor means that 16O is preferentially returned to the lake in precipitation (47). A higher (lower) ratio of evaporation to precipitation would therefore result in higher (lower) δ18O"' has been replaced by '((( "We interpret changes in ��18O as indicative of changes in the ratio of evaporation and precipitation (E/P). An increase in the evaporation relative to precipitation increases the 18O content of lakewater: H218O tends to evaporate more slowly than H216O, and the higher 16O content of atmospheric water vapor means that 16O is preferentially returned to the lake in precipitation (47). A higher (lower) ratio of evaporation to precipitation would therefore result in higher (lower) ��18O"; paleoData_units updated ))) "We interpret changes in δ18O as indicative of changes in the ratio of evaporation and precipitation (E/P). An increase in the evaporation relative to precipitation increases the 18O content of lakewater: H218O tends to evaporate more slowly than H216O, and the higher 16O content of atmospheric water vapor means that 16O is preferentially returned to the lake in precipitation (47). A higher (lower) ratio of evaporation to precipitation would therefore result in higher (lower) δ18O" /// "We interpret changes in δ18O as indicative of changes in the ratio of evaporation and precipitation (E/P). An increase in the evaporation relative to precipitation increases the 18O content of lakewater: H218O tends to evaporate more slowly than H216O, and the higher 16O content of atmospheric water vapor means that 16O is preferentially returned to the lake in precipitation (47). A higher (lower) ratio of evaporation to precipitation would therefore result in higher (lower) δ18O"'
uncertaintyLow95 (WEB0e036388): interpretation1_scope: '' has been replaced by 'climate'
uncertaintyLow95 (WEBa76a84ed): interpretation1_scope: '' has been replaced by 'climate'
uncertaintyHigh95 (WEBba2196c8): interpretation1_scope: '' has been replaced by 'climate'
uncertaintyHigh95 (WEBfa96b5b1): interpretation1_scope: '' has been replaced by 'climate'
Updated lipdverse database entry with a changed file.
geo_elevation: '' has been replaced by '2376'
age (WEB00e0403b): paleoData_notes: '' has been replaced by 'NA; paleoData_isPrimary has been standardized; paleoData_datum has been standardized'
age (WEB00e0403b): paleoData_units: 'BP' has been replaced by 'yr BP'
age (WEB00e0403b): paleoData_datum: '' has been replaced by '1950'
age (WEB00e0403b): paleoData_isPrimary: '' has been replaced by 'TRUE'
PC1 (WEB08871912): paleoData_notes: '' has been replaced by 'NA; paleoData_method has been standardized'
PC1 (WEB08871912): paleoData_method: '' has been replaced by 'principal components'
uncertaintyLow95 (WEB0e036388): paleoData_notes: '' has been replaced by 'NA; paleoData_summaryStatistic has been standardized; paleoData_inferredMaterial has been standardized; paleoData_datum has been standardized'
uncertaintyLow95 (WEB0e036388): paleoData_units: 'BP' has been replaced by 'yr BP'
uncertaintyLow95 (WEB0e036388): paleoData_variableName: 'age_calBP95-' has been replaced by 'uncertaintyLow95'
uncertaintyLow95 (WEB0e036388): paleoData_datum: '' has been replaced by '1950'
uncertaintyLow95 (WEB0e036388): paleoData_inferredMaterial: '' has been replaced by 'age'
uncertaintyLow95 (WEB0e036388): paleoData_summaryStatistic: '' has been replaced by 'quantile 2.5'
d18O (WEB4ef1e8b8): paleoData_units: 'pemil' has been replaced by 'permil'
depth (WEB5429e74b): paleoData_notes: '' has been replaced by 'NA; paleoData_isPrimary has been standardized'
depth (WEB5429e74b): paleoData_isPrimary: '' has been replaced by 'TRUE'
age (WEB5f66e134): paleoData_notes: '' has been replaced by 'NA; paleoData_isPrimary has been standardized; paleoData_datum has been standardized'
age (WEB5f66e134): paleoData_units: 'BP' has been replaced by 'yr BP'
age (WEB5f66e134): paleoData_datum: '' has been replaced by '1950'
age (WEB5f66e134): paleoData_isPrimary: '' has been replaced by 'TRUE'
depth (WEB60c27894): paleoData_notes: '' has been replaced by 'NA; paleoData_isPrimary has been standardized'
depth (WEB60c27894): paleoData_isPrimary: '' has been replaced by 'TRUE'
uncertaintyLow95 (WEBa76a84ed): paleoData_notes: '' has been replaced by 'NA; paleoData_summaryStatistic has been standardized; paleoData_inferredMaterial has been standardized; paleoData_datum has been standardized'
uncertaintyLow95 (WEBa76a84ed): paleoData_units: 'BP' has been replaced by 'yr BP'
uncertaintyLow95 (WEBa76a84ed): paleoData_variableName: 'age_calBP95-' has been replaced by 'uncertaintyLow95'
uncertaintyLow95 (WEBa76a84ed): paleoData_datum: '' has been replaced by '1950'
uncertaintyLow95 (WEBa76a84ed): paleoData_inferredMaterial: '' has been replaced by 'age'
uncertaintyLow95 (WEBa76a84ed): paleoData_summaryStatistic: '' has been replaced by 'quantile 2.5'
uncertaintyHigh95 (WEBba2196c8): paleoData_notes: '' has been replaced by 'NA; paleoData_summaryStatistic has been standardized; paleoData_inferredMaterial has been standardized'
uncertaintyHigh95 (WEBba2196c8): paleoData_variableName: 'age_calBP95+' has been replaced by 'uncertaintyHigh95'
uncertaintyHigh95 (WEBba2196c8): paleoData_inferredMaterial: '' has been replaced by 'age'
uncertaintyHigh95 (WEBba2196c8): paleoData_summaryStatistic: '' has been replaced by 'quantile 97.5'
Al2O3 (WEBfa22dabc): paleoData_proxy: 'mineralogy' has been replaced by ''
Al2O3 (WEBfa22dabc): paleoData_variableName: 'AL2O3' has been replaced by 'Al2O3'
uncertaintyHigh95 (WEBfa96b5b1): paleoData_notes: '' has been replaced by 'NA; paleoData_summaryStatistic has been standardized; paleoData_inferredMaterial has been standardized; paleoData_datum has been standardized'
uncertaintyHigh95 (WEBfa96b5b1): paleoData_units: 'BP' has been replaced by 'yr BP'
uncertaintyHigh95 (WEBfa96b5b1): paleoData_variableName: 'age_calBP95+' has been replaced by 'uncertaintyHigh95'
uncertaintyHigh95 (WEBfa96b5b1): paleoData_datum: '' has been replaced by '1950'
uncertaintyHigh95 (WEBfa96b5b1): paleoData_inferredMaterial: '' has been replaced by 'age'
uncertaintyHigh95 (WEBfa96b5b1): paleoData_summaryStatistic: '' has been replaced by 'quantile 97.5'
d18O (WEB4ef1e8b8): interpretation1_seasonality: '1,2,3,4,5,6,7,8,9,10,11,12' has been replaced by 'Annual'
Al2O3 (WEBfa22dabc): interpretation1_variable: 'M' has been replaced by 'P-E'
originalDataUrl: '' has been replaced by 'https://www.ncei.noaa.gov/access/paleo-search/study/17735'
geo_elevation: '2376' has been replaced by ''
PC1 (WEB08871912): interpretation1_scope: '' has been replaced by 'climate'
d13C (WEB5d337c69): interpretation1_scope: '' has been replaced by 'climate'
CaO (WEB77e5368a): interpretation1_scope: '' has been replaced by 'climate'
Zr (WEB830b4789): interpretation1_scope: '' has been replaced by 'climate'
Ti (WEBc4d3fb76): interpretation1_scope: '' has been replaced by 'climate'
PC1 (WEB08871912): interpretation1_scope: 'climate' has been replaced by ''
d18O (WEB4ef1e8b8): interpretation1_variableGroup: 'M' has been replaced by 'P-E'
d13C (WEB5d337c69): interpretation1_scope: 'climate' has been replaced by ''
CaO (WEB77e5368a): interpretation1_scope: 'climate' has been replaced by ''
Zr (WEB830b4789): interpretation1_scope: 'climate' has been replaced by ''
Ti (WEBc4d3fb76): interpretation1_scope: 'climate' has been replaced by ''
d18O (WEB4ef1e8b8): paleoData_mostRecentCompilations: '' has been replaced by 'HoloceneAbruptChange-0_10_0'
AL2O3 (WEBfa22dabc): paleoData_mostRecentCompilations: '' has been replaced by 'HoloceneAbruptChange-0_10_0'
geo_gcmdLocation: '' has been replaced by 'North America>Mexico'
d18O (WEB4ef1e8b8): interpretation1_variable: 'M' has been replaced by 'P-E'
d18O (WEB4ef1e8b8): interpretation1_seasonality: '' has been replaced by '1,2,3,4,5,6,7,8,9,10,11,337'
d18O (WEB4ef1e8b8): interpretation1_seasonalityGeneral: '' has been replaced by 'Annual'
d18O (WEB4ef1e8b8): interpretation1_variableDetail: '' has been replaced by 'lake@surface'
d18O (WEB4ef1e8b8): paleoData_notes: '' has been replaced by '"We interpret changes in δ18O as indicative of changes in the ratio of evaporation and precipitation (E/P). An increase in the evaporation relative to precipitation increases the 18O content of lakewater: H218O tends to evaporate more slowly than H216O, and the higher 16O content of atmospheric water vapor means that 16O is preferentially returned to the lake in precipitation (47). A higher (lower) ratio of evaporation to precipitation would therefore result in higher (lower) δ18O"'
d18O (WEB4ef1e8b8): paleoData_units: 'unitless' has been replaced by 'pemil'
d18O (WEB4ef1e8b8): paleoData_proxyDetail: '' has been replaced by 'authigenic calcite'
d18O (WEB4ef1e8b8): paleoData_QCCertification: '' has been replaced by 'CH'
AL2O3 (WEBfa22dabc): paleoData_QCnotes: '' has been replaced by 'Length <4000yrs'
d18O (WEB4ef1e8b8): calibration_method: '' has been replaced by 'VPDB'
d18O (WEB4ef1e8b8): paleoData_proxy: 'permil' has been replaced by 'd18O'
d18O (WEB4ef1e8b8): paleoData_proxyLumps: 'permil' has been replaced by 'isotope'
d18O (WEB4ef1e8b8): paleoData_proxyLumpsOriginal: '' has been replaced by 'd18O'
d18O (WEB4ef1e8b8): paleoData_proxyGeneral: '' has been replaced by 'isotope'
d13C (WEB5d337c69): paleoData_proxy: 'permil' has been replaced by 'd13C'
d13C (WEB5d337c69): paleoData_proxyLumps: 'permil' has been replaced by 'isotope'
d13C (WEB5d337c69): paleoData_proxyLumpsOriginal: '' has been replaced by 'd13C'
d13C (WEB5d337c69): paleoData_proxyGeneral: '' has been replaced by 'isotope'
AL2O3 (WEBfa22dabc): paleoData_proxy: 'mineral' has been replaced by 'mineralogy'
AL2O3 (WEBfa22dabc): paleoData_proxyLumps: 'biophysical' has been replaced by 'mineralogy'
AL2O3 (WEBfa22dabc): paleoData_notes: '' has been replaced by 'We interpret the mass % of Al2O3 as an indicator of input of plagioclase and secondary clay minerals from the maar slope walls into the lake system. The flux of Al increases during wet conditions, when enhanced slopewash transports terrigenous material into the lake system'
AL2O3 (WEBfa22dabc): paleoData_proxyGeneral: '' has been replaced by 'biophysical'
This marks the creation of the changelog, and marks the status of this dataset as of mid 2020
Cultural implications of late Holocene climate change in the Cuenca Oriental, Mexico
Proceedings of the National Academy of Sciences
There is currently no consensus on the importance of climate change in Mesoamerican prehistory. Some invoke drought as a causal factor in major cultural transitions, including the abandonment of many sites at 900 CE, while others conclude that cultural factors were more important. This lack of agreement reflects the fact that the history of climate change in many regions of Mesoamerica is poorly understood. We present paleolimnological evidence suggesting that climate change was important in the abandonment of Cantona between 900 CE and 1050 CE. At its peak, Cantona was one of the largest cities in pre-Columbian Mesoamerica, with a population of 90,000 inhabitants. The site is located in the Cuenca Oriental, a semiarid basin east of Mexico City. We developed a subcentennial reconstruction of regional climate from a nearby maar lake, Aljojuca. The modern climatology of the region suggests that sediments record changes in summer monsoonal precipitation. Elemental geochemistry (X-ray fluorescence) and δ18O from authigenic calcite indicate a centennial-scale arid interval between 500 CE and 1150 CE, overlaid on a long-term drying trend. Comparison of this record to Cantona’s chronology suggests that both the city’s peak population and its abandonment occurred during this arid period. The human response to climate change most likely resulted from the interplay of environmental and political factors. During earlier periods of Cantona’s history, increasing aridity and political unrest may have actually increased the city’s importance. However, by 1050 CE, this extended arid period, possibly combined with regional political change, contributed to the city’s abandonment.