A5086899349- Cryospheric studies and observations
- Geology and Paleoclimatology Research
- Atmospheric and Environmental Gas Dynamics
- Polar Research and Ecology
- Arctic and Antarctic ice dynamics
- Climate change and permafrost
- Atmospheric chemistry and aerosols
- Methane Hydrates and Related Phenomena
- Climate variability and models
- Winter Sports Injuries and Performance
- Isotope Analysis in Ecology
- Atmospheric Ozone and Climate
- Atmospheric aerosols and clouds
- Superconducting Materials and Applications
- Health, Environment, Cognitive Aging
- Plant Surface Properties and Treatments
- Marine and coastal ecosystems
- Groundwater and Isotope Geochemistry
- American Constitutional Law and Politics
- Pleistocene-Era Hominins and Archaeology
- Radioactive contamination and transfer
- Textile materials and evaluations
- Christian Theology and Mission
- High Altitude and Hypoxia
- Greenhouse Technology and Climate Control
University of Minnesota System
2021-2025
University of Minnesota
2021-2023
University of Rochester
2015-2023
Twin Cities Orthopedics
2023
Victoria University of Wellington
2013-2020
Institute for Soil, Climate and Water
2020
GNS Science
2015-2018
University of Washington
2012-2018
Earth and Space Research
2012-2018
Quantarctica (https://www.npolar.no/quantarctica) is a geospatial data package, analysis environment, and visualization platform for the Antarctic Continent, Southern Ocean (>40oS), sub-Antarctic islands. works with free, cross-platform Geographical Information System (GIS) software QGIS can run without an Internet connection, making it viable tool fieldwork in remote areas. The package includes basemaps, satellite imagery, terrain models, scientific nine disciplines, including physical...
Abstract Aerosol deposition over the Southern Ocean and Antarctica has potential to alter marine productivity thus ocean carbon uptake while also impacting radiative balance due scattering absorption from atmospheric particulates. Quantification of modern emission, transport, terrestrial dust other airborne material Hemisphere sources is challenging low emission levels poor detection remote sensing platforms. Here forward trajectory modeling used explore independent processes, 1979 2013....
Abstract. We present a 2700-year annually resolved chronology and snow accumulation history for the Roosevelt Island Climate Evolution (RICE) ice core, Ross Ice Shelf, West Antarctica. The core adds information on past changes in an otherwise poorly constrained sector of timescale was constructed by identifying annual cycles high-resolution impurity records, it constitutes top part Core Chronology 2017 (RICE17). Validation volcanic methane matching to WD2014 from WAIS Divide shows that two...
Abstract Between 15 and 19 March 2022, East Antarctica experienced an exceptional heat wave with widespread 30°–40°C temperature anomalies across the ice sheet. This record-shattering event saw numerous monthly records being broken including a new all-time record of −9.4°C on 18 at Concordia Station despite typically transition month to Antarctic coreless winter. The driver for these extremes was intense atmospheric river advecting subtropical/midlatitude moisture deep into interior. scope...
Abstract Between 15 and 19 March 2022, East Antarctica experienced an exceptional heat wave with widespread 30°–40°C temperature anomalies across the ice sheet. In Part I, we assessed meteorological drivers that generated intense atmospheric river (AR) caused these record-shattering anomalies. Here, continue our large collaborative study by analyzing diverse impacts driven AR landfall. These included rain surface melt was recorded along coastal areas, but this outweighed high snowfall...
Abstract. Widespread existing geological records from above the modern ice sheet surface and outboard of current margin show that Antarctic Ice Sheet (AIS) was much more extensive at Last Glacial Maximum (∼ 20 ka) than present. However, whether it ever smaller present during last few millennia, (if so) by how much, is known only for a locations because direct evidence lies within or beneath sheet, which challenging to access. Here, we describe retreat readvance (henceforth “readvance”) AIS...
Abstract. High-resolution, well-dated climate archives provide an opportunity to investigate the dynamic interactions of patterns relevant for future projections. Here, we present data from a new, annually dated ice core record eastern Ross Sea, named Roosevelt Island Climate Evolution (RICE) core. Comparison this with reanalysis 1979–2012 interval shows that RICE reliably captures temperature and snow precipitation variability in region. Trends over past 2700 years are shown be distinct...
Global warming has its largest amplitude in the higher latitude regions of Northern Hemisphere. This is especially case during winter months when reduced reflectivity from diminished snow cover leads to average temperatures. process led at twice rate as rest planet. In addition accelerated local melt, this Arctic contributing strong over Minnesota, winter, Minnesota one states that strongest within contiguous United States. We have previously emphasized our study on high-resolution climate...
Abstract A 141m ice core was recovered from Combatant Col (51.385° N, 125.258° W; 3000ma.s.l.), Mount Waddington, Coast Mountains, British Columbia, Canada. Records of black carbon, dust, lead and water stable isotopes demonstrate that unambiguous seasonality is preserved throughout the core, despite summer surface snowmelt temperate ice. High accumulation rates at site (>4 m eq. a -1 ) limit modification annual stratigraphy by percolation meltwater. The ice-core record spans period...
Emissions and long-range transport of toxic metals metalloids pose a global threat to ecosystems human health. Global industrialization occurring from the late nineteenth century releases large quantities pollutants into Earth's atmosphere. Despite international efforts mitigate emissions, accumulation is still observed in most remote regions planet. New baseline studies are needed determine (i) natural background concentration pollutants, (ii) contributions anthropogenic (iii) potential...
Abstract The Ross Sea, Antarctica, is a highly productive region of the Southern Ocean. Significant new sources iron (Fe) are required to sustain phytoplankton blooms in austral summer. Atmospheric deposition one potential source. fractional solubility Fe an important variable determining availability for biological uptake. To constrain aerosol inputs Sea region, was analyzed snow pit from Roosevelt Island, eastern Sea. In addition, aluminum, dust, and refractory black carbon (rBC)...
Abstract On 1 December 2011 the West Antarctic Ice Sheet (WAIS) Divide ice-core project reached its final depth of 3405 m. The WAIS ice core is not only longest US to date, but also highest-quality deep core, including from brittle zone, that has ever recovered. methods used at handle and log drilled ice, procedures safely retrograde back National Core Laboratory (NICL) process sample NICL are described discussed.
Abstract. High-resolution, well-dated climate archives provide an opportunity to investigate the dynamic interactions of patterns relevant for future projections. Here, we present data from a new, annually-dated ice core record eastern Ross Sea. Comparison Roosevelt Island Climate Evolution (RICE) records with reanalysis 1979–2012 calibration period shows that RICE reliably capture temperature and snow precipitation variability region. is compared West Antarctica (West Antarctic Ice Sheet...
Abstract. We present a 2700-year annually resolved timescale for the Roosevelt Island Climate Evolution (RICE) ice core, and reconstruct past snow accumulation history coastal sector of Ross Ice Shelf in West Antarctica. The was constructed by identifying annual layers multiple ice-core impurity records, employing both manual automated counting approaches, constitutes top part Core Chronology 2017 (RICE17). maritime setting results high sulfate influx from sea salts marine biogenic...
Abstract. Cosmic rays entering the Earth's atmosphere produce showers of secondary particles such as protons, neutrons, and muons. The interaction these with oxygen-16 (16O) in minerals ice quartz can carbon-14 (14C). In glacial ice, 14C is also incorporated through trapping 14C-containing atmospheric gases (14CO2, 14CO, 14CH4). Understanding production rates situ cosmogenic important to deconvolve signals both which contain valuable paleoenvironmental information. Unfortunately, by muons...
The emerging view that the West Antarctic ice sheet is in early stage of collapse owes as much to paleoclimatology contemporary observations.
Abstract. Here we present a newly developed ice core gas-phase proxy that directly samples component of the large-scale atmospheric circulation: synoptic-scale pressure variability. Surface changes weakly disrupt gravitational isotopic settling in firn layer, which is recorded krypton-86 excess (86Krxs). The 86Krxs may therefore reflect time-averaged synoptic variability over several years (site “storminess”), but it likely cannot record individual events as gas typically average years. We...