A5012020103- Geology and Paleoclimatology Research
- Cryospheric studies and observations
- Climate change and permafrost
- Methane Hydrates and Related Phenomena
- Geological Studies and Exploration
- Archaeology and ancient environmental studies
- Geological and Geochemical Analysis
- Marine and coastal plant biology
- Indigenous Studies and Ecology
- Lichen and fungal ecology
- Arctic and Russian Policy Studies
- Landslides and related hazards
- Tree-ring climate responses
- Soil and Land Suitability Analysis
- Groundwater and Isotope Geochemistry
- Geochemistry and Geologic Mapping
- Aeolian processes and effects
- Coal and Coke Industries Research
- Peatlands and Wetlands Ecology
- Protein Kinase Regulation and GTPase Signaling
- Phosphodiesterase function and regulation
- Arctic and Antarctic ice dynamics
- Geological formations and processes
- Hydrocarbon exploration and reservoir analysis
- Winter Sports Injuries and Performance
Plymouth State University
2023
Woodwell Climate Research Center
2022
Woods Hole Oceanographic Institution
2017-2021
University of Colorado Boulder
2017-2020
University of Colorado System
2014-2020
Institute of Arctic and Alpine Research
2017-2020
University at Buffalo, State University of New York
2015-2017
Abstract Arctic temperatures are increasing faster than the Northern Hemisphere average due to strong positive feedbacks unique polar regions. However, degree which recent warming is unprecedented remains debated. Ages of entombed plants in growth position preserved by now receding ice caps Canada help address this issue placing conditions a multi-millennial context. Here we show that pre-Holocene radiocarbon dates on collected at margins 30 suggest those locations were continuously covered...
We compile new and previously published lichenometric cosmogenic 10Be moraine ages to summarize the timing of Holocene glacier expansions in Brooks Range, Arctic Alaska. Foundational studies suggested that glaciers likely grew their maxima as early middle Holocene, followed by several episodes building prior to, throughout, last millennium. Previously on boulders from north-central Range constrain culmination maximum advances between 4.6 ka 2.6 ka. New two different valleys central here show...
Research Article| May 01, 2015 Rapid and early deglaciation in the central Brooks Range, Arctic Alaska Simon L. Pendleton; Pendleton 1Department of Geology, University at Buffalo, New York 14260, USA *Current address: Department Geological Sciences, Colorado, UCB 399, Boulder, Colorado 80309, USA, Search for other works by this author on: GSW Google Scholar Elizabeth G. Ceperley; Ceperley Jason P. Briner; Briner Darrell S. Kaufman; Kaufman 2School Earth Sciences Environmental Sustainability,...
Abstract. Records of Neoglacial glacier activity in the Arctic constructed from moraines are often incomplete due to a preservation bias toward most extensive advance, Little Ice Age. Recent warming has caused retreat glaciers over past several decades, exposing preserved landscapes complete with situ tundra plants previously entombed by ice. The radiocarbon ages these define timing snowline depression and advance across site, response local summer cooling. Erosion rapidly removes dead that...
Abstract The periodic input of meltwater into the ocean from a retreating Laurentide Ice Sheet is often hypothesized to have weakened Atlantic meridional overturning circulation (AMOC) and triggered several cold periods during last deglaciation (21,000 8,000 years before present). Here, we use numerical model investigate whether Intra-Allerød Cold Period was by drainage Glacial Lake Iroquois, ~13,300 ago. Performing large suite experiments with various combinations single successive, short...
Abstract. Most extant ice caps mantling low-relief Arctic Canada landscapes remained cold based throughout the late Holocene, preserving in situ bryophytes killed as expanded across vegetated landscapes. After reaching peak Holocene dimensions ∼1900 CE, receded summers warmed, exposing entombed vegetation. The calibrated radiocarbon ages of moss collected near cap margins (kill dates) define when advanced site, killing moss, and over site until year their collection. In an earlier study, we...
<p>The early Holocene (11.7 ka to 8.2 ka) represents the most recent period when Laurentide and Greenland ice sheets underwent large-scale recession. Moreover, this ice-sheet recession occurred under backdrop of regional temperatures that were similar or warmer than today, comparable those projected for upcoming centuries. Reconstructing sheet behavior during Holocene, elucidating mechanisms dictating may serve as a partial analog future change in warming world. Here, we use...
Abstract. Most extant small ice caps mantling low-relief Arctic Canada landscapes remained cold-based throughout the late Holocene, preserving in situ bryophytes killed as expanded across vegetated landscapes. As summers warmed after 1900 CE, receded, exposing entombed vegetation. The calibrated radiocarbon ages of dead moss collected near ice-cap margins (kill-dates) define when advanced site, killing moss, and over site until year their collection. In an earlier study we reported 94 Last...