As the hydrogen isotopic composition of precipitation in tropical West Africa is controlled mostly by the ?amount effect? (22), ?Dwax values are interpreted here as indicators of changes in wet season precipitation intensity, following corrections for global ice volume and vegetation type (Supplementary Section 2.3 and Fig. 5). Independent support for the ?Dwax record comes from an updated reconstruction of palaeolake-level variations at Lake Bosumtwi (Supplementary Section 2.2; ref. 23).

Shanahan, Timothy M. , McKay, Nicholas P. , Hughen, Konrad A. , Overpeck, Jonathan T. , Otto-Bliesner, Bette , Heil, Clifford W. , King, John , Scholz, Christopher A. , Peck, John

The time-transgressive termination of the African Humid Period

Shanahan, T. M., McKay, N. P., Hughen, K. A., Overpeck, J. T., Otto-Bliesner, B., Heil, C. W., King, J., Scholz, C. A. and Peck, J.: The time-transgressive termination of the African Humid Period, Nature Geoscience, 8(2), 140–144, doi:10.1038/ngeo2329, 2015.

LS15SHBO01A: standardized variable names, changed character strings to numeric values where necessary, changed depths in chronData to cm, renamed 'chronMeasurementTable' to 'measurementTable'

d2H (LS15SHBO01A): interpretation3_scope: '' has been replaced by 'isotope'
d2H (LS15SHBO01A): interpretation4_scope: '' has been replaced by 'isotope'

"Thermo Scientific® Trace gas chromato- graph equipped with a Rxi-5ms column (30 m 0.25 mm, film thickness 1 mm) and a programmable temperature vaporizing (PTV) injector operated in solvent split mode with an evaporation tem- perature of 60 C. The GC was connected via a GC Isolink with a pyrolysis furnace (at 1400 C) via a Conflo IV interface to a Del- taVPlus isotope ratio mass spectrometer. The Hþ3 -factor was determined daily to test linearity and accounted for 6.1 ppm mV1 on average. Reference peaks of H2 were co-injected between n- alkanoic acid peaks during the course of a GCeIRMS run; two of these peaks were used for standardization of the isotopic analysis, while the remainders were treated as unknowns to assess preci- sion. Except for the case of co-elution, precision of these replicates was better than 0.6‰. The data were normalized to the VSMOW/ SLAP hydrogen isotopic scale by comparing with an external stan- dard containing 15 n-alkane compounds (C16 to C30) with known dD values obtained from A. Schimmelmann, Bloomington. Indiana University,"