East Asian Monsoon Strength; more negative values of d18O are interpreted as indicative of increased monsoon strength

DYKOSKI, C., EDWARDS, R., CHENG, H., YUAN, D., CAI, Y., ZHANG, M., LIN, Y., QING, J., AN, Z. and REVENAUGH, J.: A high-resolution, absolute-dated Holocene and deglacial Asian monsoon record from Dongge Cave, China, Earth and Planetary Science Letters, 233(1-2), 71–86, doi:10.1016/j.epsl.2005.01.036, 2005.

d18O (SP06DYCN01A): interpretation4_scope: '' has been replaced by 'isotope'

TP: site elevation estimate of 1244 m from Google Earth

observed negative correlation between summer monsoon rainfall amount and d18O

under present conditions, wet years often have higehr amount of winter rain, but d18O may reflect high summer rain, winter rain, or both

more positive d18O values are interpreted to represent wetter conditions

summer is the main rainfall season with moisture sources primarily in the Gulf of Mexico and generally high values (~-3 permil) - these values however change depending on the amount of rainfall; winter rain has lower amounts and sources in the Pacific Ocean with lower values (~-11 permill).

Asmerom, Y., Polyak, V., Burns, S. and Rassmussen, J.: Solar forcing of Holocene climate: New insights from a speleothem record, southwestern United States, Geology, 35(1), 1, doi:10.1130/g22865a.1, 2007.

d18O (SP07ASUS01A): interpretation4_scope: '' has been replaced by 'isotope'

Finnigan MAT 252 with Kiel III automated carbonate device

drilling with 0.3 mm bit at 3 mm intervals

repetition test comparing d18O and d13C of two speleothems shows similar trends

LCB: Two stals from the same cave are not cleraly distinguished in the lipdverse. This happens with all names ending 01A 02A 03A, for example

d18O values are comparatively stable which is interpreted to reflect stable temperature in the region.

Increase of d13C may generally be associated with increase of the proportion of C4 plants in the vegetation or increase of the contribution of bedrock carbonate to the DIC - both are more likely in drier conditions. Stable d18O values suggest that changes in temperature were minor.