High resolution multiproxy paleoclimatology of the late Holocene, with special emphasis on tropical processes, hydrometeorological variations, and global climate change. Modeling of the processes by which environmental forcing is represented in proxy measurements made in biogeochemical climate archives. Analysis of historical climate data sets. Climate field reconstruction from sparse proxy observational networks using techniques derived from objective analysis and Bayesian hierarchical methods. Analysis and modeling of paleoreconstruction uncertainties.