[234U/238U] activity ratio in the sub-sample

analytical uncertainty of 234U-238U activity

[232Th/238U] activity ratio in the sub-sample

analytical uncertainty of 232Th-238U activity

[234U/238U]0 initial activity ratio in the sub-sample

analytical uncertainty of 234U-238U0 activity

error correlation between [234U/238U]0 and 230Th-age

The main rainfall season is between May and October and associated with the ITCZ, moisture sources are in the Caribbean. Little rain falls in winter with sources in the Pacific Ocean. The amount effect leads to shifts of d18O in areas of Guatemala and Belize that are influenced by the same wind and climate patterns and moisture sources.

Bernal, J. P., Lachniet, M., McCulloch, M., Mortimer, G., Morales, P. and Cienfuegos, E.: A speleothem record of Holocene climate variability from southwestern Mexico, Quaternary Research, 75(1), 104–113, doi:10.1016/j.yqres.2010.09.002, 2011.

d18O (SP11BEMX01A): interpretation3_scope: '' has been replaced by 'isotope'
d18O (SP11BEMX01A): interpretation4_scope: '' has been replaced by 'isotope'
d13C (SP11BEMX01A_d13C): interpretation2_scope: '' has been replaced by 'isotope'
d13C (SP11BEMX01A_d13C): interpretation3_scope: '' has been replaced by 'isotope'

ThermoFisher DeltaplusXL isotope ratio mass spectrometer coupled to a ThermoFisher GasBench II.

the precision of the d13C and d18O values expressed as the 1-sigma standard deviation is 0.06 and 0.08%,

There is kinetic isotope fractionation: Strongly positive correlation between d13C and d18O values in the younger segments with Dd13C/Dd18O slopes of 1?1.5. The older parts of the cores are characterized by a significantly lower degree of correlation and typically lower slopes. Linear fits of d13C vs. d18O in cores PFU8 and PFU9 show comparable slopes (1?1.5) but typically lower coefficients (in particular PFU8). Modern calcite precipitates also exhibit a strongly positive correlation of C and O isotope values (R2=0.87). A comparison of the drill core d18O values with calculated modern O isotopic equilibrium values based on monitoring data reveals O isotopic compositions close to isotopic equilibrium only for the calcite d18O minima.