A5072328553- Geology and Paleoclimatology Research
- Rangeland and Wildlife Management
- Species Distribution and Climate Change
- Tree-ring climate responses
- Atmospheric and Environmental Gas Dynamics
- Fire effects on ecosystems
- Botany, Ecology, and Taxonomy Studies
- Climate variability and models
- Ecology and Vegetation Dynamics Studies
- Plant Water Relations and Carbon Dynamics
- Climate change and permafrost
- Cryospheric studies and observations
- Archaeology and Natural History
- Forest Management and Policy
- Hydrology and Watershed Management Studies
- Forest ecology and management
- Pleistocene-Era Hominins and Archaeology
- Coastal wetland ecosystem dynamics
- Landslides and related hazards
- Peatlands and Wetlands Ecology
- Geological Modeling and Analysis
- Wildlife Ecology and Conservation
- Forensic Toxicology and Drug Analysis
- Botany and Plant Ecology Studies
- Geochemistry and Geologic Mapping
United States Geological Survey
2010-2024
Geosciences and Environmental Change Science Center
2013-2024
Baylor College of Medicine
2019-2022
Emory University
2019-2020
National Center for Emerging and Zoonotic Infectious Diseases
2019
Christiana Care Health System
2014
American Geophysical Union
2006
Lawrence Livermore National Laboratory
2006
Planetary Science Institute
2005-2006
Institute of Seismology
2005-2006
Climate change is predicted to be one of the greatest drivers ecological in coming century. Increases temperature over last century have clearly been linked shifts species distributions. Given magnitude projected future climatic changes, we can expect even larger range These changes will, turn, alter communities and functioning ecosystems. Despite seriousness climate change, uncertainty climate-change projections makes it difficult for conservation managers planners proactively respond...
The principles of systematic conservation planning are now widely used by governments and non-government organizations alike to develop biodiversity plans for countries, states, regions, ecoregions. Many the species ecosystems these were designed conserve being affected climate change, there is a critical need incorporate new complementary approaches into that will aid in adjusting potential change impacts. We propose five adaptation can be integrated existing or plans: (1) conserving...
Given their physiological requirements, limited dispersal abilities, and hydrologically sensitive habitats, amphibians are likely to be highly future climatic changes. We used three approaches map areas in the western hemisphere where particularly affected by climate change. First, we bioclimatic models project potential climate-driven shifts distribution of 413 amphibian species based on 20 simulations for 2071-2100. summarized these projections produce estimates turnover. Second, mapped...
As natural resource management agencies and conservation organizations seek guidance on responding to climate change, myriad potential actions strategies have been proposed for increasing the long-term viability of some attributes systems. Managers need practical tools selecting among these develop a tailored approach specific targets at given location. We developed present one such tool, participatory Adaptation Conservation Targets (ACT) framework, which considers effects change in...
CDC, the Food and Drug Administration (FDA), state local health departments, public clinical stakeholders are investigating a nationwide outbreak of e-cigarette, or vaping, product use-associated lung injury (EVALI) (1). As November 13, 2019, 49 states, District Columbia, two U.S. territories (Puerto Rico Virgin Islands) have reported 2,172 EVALI cases to including 42 (1.9%) EVALI-associated deaths. To inform surveillance, during 2019-20 influenza season, case report information supplied by...
Abstract. The “paleo calendar effect” is a common expression for the impact that changes in length of months or seasons over time, related to eccentricity Earth's orbit and precession, have on analysis summarization climate-model output. This effect can significant implications paleoclimate analyses. In particular, using “fixed-length” definition (i.e., defined by fixed number days), as opposed “fixed-angular” degrees orbit), leads comparisons data from different positions along when...
Abstract. The length of time that carbon remains in forest biomass is one the largest uncertainties global cycle, with both recent historical baselines and future responses to environmental change poorly constrained by available observations. In absence large-scale observations, models used for assessments tend fall back on simplified assumptions turnover rates soil pools. this study, times calculated an ensemble contemporary terrestrial biosphere (TBMs) are analysed assess their current...
Biotic responses to future changes in global climate are difficult project for a particular region because the involve processes that operate at many spatial scales. This difficulty is exacerbated mountainous regions, where vegetation often portrayed as simple upward displacements of zones response warming. We examine scope may occur area by illustrating potential distributions selected tree taxa Yellowstone National Park. The output coarse-resolution model incorporated doubling carbon...
Calibration of the radiocarbon timescale paleoecological records is essential if they are to be explained correctly in terms their governing ecological or climatological controls. The differences between calendar ages and that arise from variations 14C production through time can distort chronologies individual interpretations based on them. Misleading impressions synchrony diachrony events among multiple result, estimates apparent duration episodes rates sedimentation local population...
Abstract In unglaciated terrain, the imprint of past glacial periods is difficult to discern. The topographic signature periglacial processes, such as solifluction lobes, may be erased or hidden by time and vegetation, thus their import diminished. Belowground, weathering, particularly frost cracking, have imparted a profound influence on weathering erosion rates during climate regimes. By combining mechanical frost‐weathering model with full suite Last Glacial Maximum simulations, we...
The temporal and spatial structure of 332 404 daily fire-start records from the western United States for period 1986 through 1996 is illustrated using several complimentary visualisation techniques. We supplement maps time series plots with Hovmöller diagrams that reduce dimensionality data in order to reveal underlying space–time structure. mapped distributions all lightning- human-started fires during 11-year interval show similar first-order patterns reflect broad-scale distribution...
Abstract Results are presented and compared for the Community Earth System Model version 2 (CESM2) simulations of middle Holocene (MH, 6 ka) Last Interglacial (LIG, 127 ka). These designated as Tier 1 experiments ( midHolocene lig127k ) Coupled Intercomparison Project phase (CMIP6) Paleoclimate Modeling 4 (PMIP4). They use low‐top, standard 1° CESM2 contributing to CMIP6 DECK, historical, future projection simulations, other modeling intercomparison projects. The provide opportunity examine...
Abstract During the Last Interglacial, approximately 129 to 116 ka (thousand years ago), Arctic summer climate was warmer than present, and Greenland Ice Sheet retreated a smaller extent its current state. Previous model‐derived geological reconstruction estimates of sea‐level contribution during Interglacial vary widely. Here, we conduct transient simulation from 127 119 using Community Earth System Model (CESM2), which includes dynamic ice sheet component (the Model, CISM2) that is...
In July 2015, personnel in the Alaska Division of Public Health's Section Epidemiology became aware an increase number patients being treated Anchorage hospital emergency departments for adverse reactions associated with use synthetic cannabinoids (SCs). SCs are a chemically diverse class designer drugs that bind to same cannabinoid receptors as tetrahydrocannabinol, main psychoactive component cannabis. A public health investigation was initiated describe clinical outcomes, characterize...
Future climate change may significantly alter the distributions of many plant taxa. The effects be particularly large in mountainous regions where can vary with elevation. Understanding potential future vegetation changes these requires methods that resolve responses to at fine spatial resolutions. We used LPJ, a dynamic global model, assess for topographically complex area northwest United States and southwest Canada (38.0-58.0°N latitude by 136.6-103.0°W longitude). LPJ is process-based...
Background Previous studies examining the time to initiate chemoradiation (CRT) after surgical resection of glioblastoma have been conflicting. To better define effect that timing adjuvant treatment may on outcomes, authors examined patients within National Cancer Database (NCDB) stratified by a validated prognostic classification system. Methods Patients with in NCDB who underwent surgery and CRT from 2004 through 2013 were analyzed. Radiation Therapy Oncology Group recursive partitioning...
Abstract. Arctic land-cover changes induced by recent global climate change (e.g., expansion of woody vegetation into tundra and effects permafrost degradation) are expected to generate further feedbacks the system. Past can be used assess our understanding feedback mechanisms through a combination process modeling paleo-observations. The subcontinental region Beringia (northeastern Siberia, Alaska, northwestern Canada) was largely ice-free at peak deglacial warming experienced both major...