• Publications
  • Influence
Climate-Driven Ecosystem Succession in the Sahara: The Past 6000 Years
Desiccation of the Sahara since the middle Holocene has eradicated all but a few natural archives recording its transition from a “green Sahara” to the present hyperarid desert. Our continuousExpand
  • 488
  • 42
The Case for Atmospheric Mercury Contamination in Remote Areas
Elevated levels of mercury in aquatic environments remote from industrial sources have been broadly attributed to long-range atmospheric transport and deposition of anthropogenic Hg. Evidence inExpand
  • 876
  • 40
Modern and historic atmospheric mercury fluxes in northern Alaska: Global sources and Arctic depletion.
We reconstruct from lake-sediment archives atmospheric Hg deposition to Arctic Alaska over the last several centuries and constrain a contemporary lake/watershed mass-balance with real-timeExpand
  • 192
  • 25
Pronounced climatic variations in Alaska during the last two millennia
Paired oxygen-isotopic analyses of abiotic carbonate and benthic-ostracode shells from lake sediments provide a continuous quantitative record of growing-season temperature for the past 2000 years inExpand
  • 127
  • 22
Increasing Rates of Atmospheric Mercury Deposition in Midcontinental North America
Mercury contamination of remote lakes has been attributed to increasing deposition of atmospheric mercury, yet historic deposition rates and inputs from terrestrial sources are essentially unknown.Expand
  • 434
  • 20
Modern and historic atmospheric mercury fluxes in both hemispheres: Global and regional mercury cycling implications
[1] Using two different natural archiving media from remote locations, we have reconstructed the atmospheric deposition of mercury (Hg) over the last 800–1000 years in both hemispheres. This effortExpand
  • 197
  • 19
Chemical and biological trends during lake evolution in recently deglaciated terrain
As newly formed landscapes evolve, physical and biological changes occur that are collectively known as primary succession. Although succession is a fundamental concept in ecology, it is poorlyExpand
  • 296
  • 18
Geochemistry of ostracode calcite: Part 1. An experimental determination of oxygen isotope fractionation
Late-instar juveniles of the North American ostracode,Candona rawsoni, were cultured to maturity under controlled oxygen isotope composition and temperature (15°C and 25°C) to measure isotopicExpand
  • 127
  • 18
Historical and present fluxes of mercury to Vermont and New Hampshire lakes inferred from 210Pb dated sediment cores
Abstract Lakes across the Northern Hemisphere have experienced enhanced atmospheric deposition of anthropogenically derived Hg for over 100 years. In the present study, we quantified Hg fluxes to theExpand
  • 121
  • 17
An Assessment of Chironomidae as Quantitative Indicators of Past Climatic Change
The distribution among Labrador (Canada) lakes of remains from 21 chironomid taxa was analysed by means of canonical correspondence analysis (CCA). Tests with partial CCA of three hypotheses revealedExpand
  • 287
  • 17