ASE350, HP 6890 GC, Finnigan MAT Delta+ XL mass spectrometer
; archiveType changed - was originally Lake sediment (LS)
Indian source: "Sacred Lake currently receives no Atlantic-derived precipi- tation, and its elevation, northeastern slope exposure, and rainfall seasonality make it particularly susceptible to changes in the Indian Ocean monsoons. In contrast, equatorial lakes in central Kenya (e.g. Lake Naivasha) and the western Rift Valley (e.g. Lake Edward, Uganda/ Congo) receive a mixture of Indian- and Atlantic-derived moisture, and hence are sensitive to both monsoons (Nicholson, 1996). " Moisture transport and temperature influence: "The strength of low-level equatorial westerlies in the Indian Ocean has been linked to East African lake levels as well as Mt. Kenyas glaciers, with stronger (weaker) winds inhibiting (enhanc- ing) precipitation in East Africa (Hastenrath, 2001). Overall, these west- erlies have increased in strength since the 1880s. This important Indian Ocean forcing may explain Sacred Lakes particular sensitivity to these changes, and recent drying may have also been locally enhanced by a re- cent rise in temperature (via an upward shift in the ZMR and/or in- creased evaporation of soil water)"
strength of Indian ocean moisture transport
In East Africa, stable isotopes in modern precipitation have been shown to reflect large-scale atmospheric circulation processes (Vuille et al., 2005), and the ?18O of precipitation (and by inference, the ?D of precipitation) on Mt. Kenya has been shown to be a good indicator of moisture balance (Barker et al., 2001). Leaf wax ?D reflects ?Dprecip, after a series of offsets due to soil water evaporation, fractionation of leaf water relative to xylem water, and biosynthesis (Sachse et al., 2012).
Air temperature has 2 influences: "air temperature is important for the elevation of the zone of maximum rainfall (ZMR) on Mt. Kenya" and for soil/lake evaporation. "Recent drying may have also been locally enhanced by a recent rise in temperature (via an upward shift in the ZMR and/or increased evaporation of soil water)."
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)
year (MAT11712e4d07): interpretation4_scope: '' has been replaced by 'climate'
depth (MATb0c73ae5e6): interpretation4_scope: '' has been replaced by 'climate'
d2H (LS14KOSA01A): paleoData_isPrimary: '' has been replaced by 'FALSE'
d2H (LS14KOSA01A): paleoData_primaryAgeColumn: '' has been replaced by 'FALSE'
year (MAT11712e4d07): paleoData_isPrimary: '' has been replaced by 'TRUE'
year (MAT11712e4d07): paleoData_primaryAgeColumn: '' has been replaced by 'TRUE'
depth (MATb0c73ae5e6): paleoData_isPrimary: '' has been replaced by 'FALSE'
depth (MATb0c73ae5e6): paleoData_primaryAgeColumn: '' has been replaced by 'FALSE'
d2H (LS14KOSA01A): interpretation2_basis: 'In East Africa, stable isotopes in modern precipitation have been shown to reflect large-scale atmospheric circulation processes (Vuille et al., 2005), and the ?18O of precipitation (and by inference, the ?D of precipitation) on Mt. Kenya has been shown to be a good indicator of moisture balance (Barker et al., 2001). Leaf wax ?D reflects ?Dprecip, after a series of offsets due to soil water evaporation, fractionation of leaf water relative to xylem water, and biosynthesis (Sachse et al., 2012).' has been replaced by ''
d2H (LS14KOSA01A): interpretation2_direction: 'positive' has been replaced by ''
d2H (LS14KOSA01A): interpretation2_inferredMaterial: 'soil water' has been replaced by ''
d2H (LS14KOSA01A): interpretation2_mathematicalRelation: 'linear' has been replaced by ''
d2H (LS14KOSA01A): interpretation2_rank: '1' has been replaced by ''
d2H (LS14KOSA01A): interpretation2_scope: 'isotope' has been replaced by 'climate'
d2H (LS14KOSA01A): interpretation2_seasonality: 'Annual' has been replaced by ''
d2H (LS14KOSA01A): interpretation2_seasonalityOriginal: 'Annual' has been replaced by ''
d2H (LS14KOSA01A): interpretation2_variable: 'precipitationIsotope' has been replaced by ''
d2H (LS14KOSA01A): interpretation2_variableGroup: 'P_isotope' has been replaced by ''
d2H (LS14KOSA01A): interpretation2_variableGroupDirection: 'positive' has been replaced by ''
d2H (LS14KOSA01A): interpretation3_basis: 'Air temperature has 2 influences: "air temperature is important for the elevation of the zone of maximum rainfall (ZMR) on Mt. Kenya" and for soil/lake evaporation. "Recent drying may have also been locally enhanced by a recent rise in temperature (via an upward shift in the ZMR and/or increased evaporation of soil water)."' has been replaced by ''
d2H (LS14KOSA01A): interpretation3_direction: 'positive' has been replaced by ''
d2H (LS14KOSA01A): interpretation3_inferredMaterial: 'soil water' has been replaced by ''
d2H (LS14KOSA01A): interpretation3_rank: '2' has been replaced by ''
d2H (LS14KOSA01A): interpretation3_scope: 'isotope' has been replaced by 'climate'
d2H (LS14KOSA01A): interpretation3_seasonality: 'Annual' has been replaced by ''
d2H (LS14KOSA01A): interpretation3_seasonalityOriginal: 'Annual' has been replaced by ''
d2H (LS14KOSA01A): interpretation3_variable: 'temperature' has been replaced by ''
d2H (LS14KOSA01A): interpretation3_variableGroup: 'Temperature' has been replaced by ''
d2H (LS14KOSA01A): interpretation3_variableGroupDirection: 'negative' has been replaced by ''
d2H (LS14KOSA01A): interpretation3_variableGroupOriginal: 'T_air' has been replaced by ''
d2H (LS14KOSA01A): interpretation4_basis: '' has been replaced by 'In East Africa, stable isotopes in modern precipitation have been shown to reflect large-scale atmospheric circulation processes (Vuille et al., 2005), and the ?18O of precipitation (and by inference, the ?D of precipitation) on Mt. Kenya has been shown to be a good indicator of moisture balance (Barker et al., 2001). Leaf wax ?D reflects ?Dprecip, after a series of offsets due to soil water evaporation, fractionation of leaf water relative to xylem water, and biosynthesis (Sachse et al., 2012).'
d2H (LS14KOSA01A): interpretation4_direction: '' has been replaced by 'positive'
d2H (LS14KOSA01A): interpretation4_inferredMaterial: '' has been replaced by 'soil water'
d2H (LS14KOSA01A): interpretation4_mathematicalRelation: '' has been replaced by 'linear'
d2H (LS14KOSA01A): interpretation4_rank: '' has been replaced by '1'
d2H (LS14KOSA01A): interpretation4_scope: '' has been replaced by 'isotope'
d2H (LS14KOSA01A): interpretation4_seasonality: '' has been replaced by 'Annual'
d2H (LS14KOSA01A): interpretation4_seasonalityOriginal: '' has been replaced by 'Annual'
d2H (LS14KOSA01A): interpretation4_variable: '' has been replaced by 'precipitationIsotope'
d2H (LS14KOSA01A): interpretation4_variableGroup: '' has been replaced by 'P_isotope'
d2H (LS14KOSA01A): interpretation4_variableGroupDirection: '' has been replaced by 'positive'
d2H (LS14KOSA01A): interpretation5_basis: '' has been replaced by 'Air temperature has 2 influences: "air temperature is important for the elevation of the zone of maximum rainfall (ZMR) on Mt. Kenya" and for soil/lake evaporation. "Recent drying may have also been locally enhanced by a recent rise in temperature (via an upward shift in the ZMR and/or increased evaporation of soil water)."'
d2H (LS14KOSA01A): interpretation5_direction: '' has been replaced by 'positive'
d2H (LS14KOSA01A): interpretation5_inferredMaterial: '' has been replaced by 'soil water'
d2H (LS14KOSA01A): interpretation5_rank: '' has been replaced by '2'
d2H (LS14KOSA01A): interpretation5_scope: '' has been replaced by 'isotope'
d2H (LS14KOSA01A): interpretation5_seasonality: '' has been replaced by 'Annual'
d2H (LS14KOSA01A): interpretation5_seasonalityOriginal: '' has been replaced by 'Annual'
d2H (LS14KOSA01A): interpretation5_variable: '' has been replaced by 'temperature'
d2H (LS14KOSA01A): interpretation5_variableGroup: '' has been replaced by 'Temperature'
d2H (LS14KOSA01A): interpretation5_variableGroupDirection: '' has been replaced by 'negative'
d2H (LS14KOSA01A): interpretation5_variableGroupOriginal: '' has been replaced by 'T_air'
d2H (LS14KOSA01A): interpretation6_scope: '' has been replaced by 'isotope'
year (MAT11712e4d07): interpretation1_scope: '' has been replaced by 'climate'
year (MAT11712e4d07): interpretation2_scope: '' has been replaced by 'climate'
year (MAT11712e4d07): interpretation3_scope: '' has been replaced by 'climate'
depth (MATb0c73ae5e6): interpretation1_scope: '' has been replaced by 'climate'
depth (MATb0c73ae5e6): interpretation2_scope: '' has been replaced by 'climate'
depth (MATb0c73ae5e6): interpretation3_scope: '' has been replaced by 'climate'
Updated lipdverse database entry with a changed file.
d2H (LS14KOSA01A): interpretation1_seasonality: 'OND' has been replaced by 'Oct-Dec'
d2H (LS14KOSA01A): interpretation1_variable: 'strength of Indian ocean moisture transport' has been replaced by 'circulationVariable'
d2H (LS14KOSA01A): interpretation2_seasonality: 'annual' has been replaced by 'Annual'
d2H (LS14KOSA01A): interpretation2_variable: 'P_isotope' has been replaced by 'precipitationIsotope'
d2H (LS14KOSA01A): interpretation3_seasonality: 'annual' has been replaced by 'Annual'
d2H (LS14KOSA01A): interpretation3_variable: 'T_air' has been replaced by 'temperature'
Changes made as part of LiPDverse vocabulary standardization process
d2H (LS14KOSA01A): paleoData_longName: '' has been replaced by 'AD'
year (MAT11712e4d07): paleoData_units: 'AD' has been replaced by 'yr AD'
year (MAT11712e4d07): paleoData_longName: '' has been replaced by 'AD'
depth (MATb0c73ae5e6): paleoData_longName: '' has been replaced by 'AD'
Konecky, Bronwen , Russell, James , Huang, Yongsong , Vuille, Mathias , Cohen, Lily , Street-Perrott, F. Alayne
Konecky, B., Russell, J., Huang, Y., Vuille, M., Cohen, L. and Street-Perrott, F. A.: Impact of monsoons, temperature, and CO2 on the rainfall and ecosystems of Mt. Kenya during the Common Era, Palaeogeography, Palaeoclimatology, Palaeoecology, 396, 17–25, doi:10.1016/j.palaeo.2013.12.037, 2014.
Palaeogeography, Palaeoclimatology, Palaeoecology
Impact of monsoons, temperature, and CO2 on the rainfall and ecosystems of Mt. Kenya during the Common Era