I have used low-temperature scanning tunneling microscopy to investigate cluster diffusion phenomena in both the early stages of nucleation and growth and the late stages for a highly mismatched system, Cu on Ag(111). In particular, activation energies and prefactors for cluster diffusion are measured directly by tracking cluster motion with atomic precision at multiple temperatures to determin...

Patterns of fish distribution in French Polynesia were studied at several spatial scales: a single transect (with 280 species, 22 stations), on Moorea Island; several transects on the same island (171 species, 14 stations) and transects from 5 islands including Moorea (189 species, 10 stations). There were significant variations in abundance, richness and composition of species among sites with...

Quantifying and characterizing groundwater flow discharge from barrier islands to coastal waters is crucial for assessing freshwater resources contaminant transport the ocean. In this study, we examined hydrological response, discharge, associated nutrient fluxes in Dauphin Island, a island located northeastern Gulf of Mexico. We employed radon ( 222 Rn) radium (Ra) isotopes as tracers evaluate...

Abstract The eastern Australia coastline is characterized by impressive coastal landforms and an extensive northward-moving longshore drift system that have been influenced a stable, long-term tectonic history over the Quaternary period. However, timing drivers of formation two conspicuous landscape features—Fraser Island (K’gari) Great Barrier Reef—remain poorly understood. Here we use optical...