A new speleothem record from the tropical Cerrado of Brazil (Angelica cave) is being processed for paleoclimatic reconstructions.
Isotope Geochemistry - Wang Xianfeng
This research team uses istotope geochemistry as a tool to solve the mysteries of paleoclimate. Xianfeng Wang and his group seek to understand how hydro-climates change in the tropics during late Pleistocene and Holocene, how the changes relate to those in other parts of the world, if they are connected at all, and how tropical climate changes influence human society or vice versa.
To achieve these, the team works with both terrestrial and marine sediment samples from the tropics, including speleothems and corals. Sample ages are typically determined by high precision radiometric dating techniques, while their stable isotopic compositions and elemental ratios are often applied for semi-quantitative climate assessments and correlations.
The main areas of research involve the study of hydrology of climate through speleothem records and the study of corals as indicators of sea level changes.
South Atlantic Convergence Zone behavior over the mid to late-Holocene inferred from speleothem records
This project is motivated by two interconnected scientific debates, that is, (1) to what extent that the recent fast warming in the tropical Indian Ocean is driven by anthropogenic greenhouse forcing, and (2) whether the warming has dominated the...
Mechanisms of moisture isotopic fractionation and Asian monsoon dynamics since the last glacial maximum
For this project we propose a multi-proxy (trace elements, water inclusion and carbonate δ18O) study on speleothems collected from sites along a SW-NE transect in a region dominated by the Indian monsoon.
Characterizing coral open-system behavior by high-precision U/Th dating: a case study in Sumba Island, Indonesia
Our knowledge of past sea-level change is largely relying on high-precision uranium/thorium disequilibrium dating on fossil corals.
The primary objective of this project is to measure Ba and Ba isotopes in the river waters and oceans of Southeast Asia in order to characterize and also understand the potential of using Ba isotopes as a productivity, run off and water mass...
Mercury Isotopes for Source Apportionment Study of Atmospheric Particle Bound Mercury in an Urban Setting
By studying mercury isotopes in particle bound mercury, Wang and team are trying to understand whether the isotopic composition is representative of anthropogenic pollution sources or is modified by atmospheric phenomenon.