A5004973436- Methane Hydrates and Related Phenomena
- Geology and Paleoclimatology Research
- Geomagnetism and Paleomagnetism Studies
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- Cryospheric studies and observations
- Geological and Geophysical Studies
- Geological formations and processes
- Geophysics and Gravity Measurements
- Spacecraft and Cryogenic Technologies
- Planetary Science and Exploration
- Hydrocarbon exploration and reservoir analysis
- Offshore Engineering and Technologies
- Pleistocene-Era Hominins and Archaeology
- Scientific Research and Discoveries
- Astronomy and Astrophysical Research
- Geological and Geochemical Analysis
- Solar and Space Plasma Dynamics
- Winter Sports Injuries and Performance
- Arctic and Antarctic ice dynamics
- Geological Modeling and Analysis
- Polar Research and Ecology
- Geological Studies and Exploration
- Seismic Imaging and Inversion Techniques
- Marine and environmental studies
Lamont-Doherty Earth Observatory
2022-2025
Columbia University
2023-2025
Scripps Institution of Oceanography
2020-2022
University of California, San Diego
2020-2022
Oregon State University
2014-2020
University of Wisconsin System
2020
University of Tasmania
2020
Massachusetts Maritime Academy
2018
International Ocean Discovery Program
2016
Montclair State University
2016
Abstract The processes controlling advance and retreat of outlet glaciers in fjords draining the Greenland Ice Sheet remain poorly known, undermining assessments their dynamics associated sea-level rise a warming climate. Mass loss has increased six-fold over last four decades, with discharge melt from comprising key components this loss. Here we acquired oceanographic data multibeam bathymetry previously uncharted Sherard Osborn Fjord northwest where Ryder Glacier drains into Arctic Ocean....
Abstract Antarctica is one of the most vulnerable regions to climate change on Earth and studying past present responses this polar marine ecosystem environmental a matter urgency. Sedimentary ancient DNA ( sed aDNA) analysis can provide such insights into ecosystem-wide changes. Here we authenticated (through extensive contamination control aDNA damage analysis) metagenomic eukaryote from Scotia Sea region acquired during IODP Expedition 382. We also record ~1 Mio. years diatom chlorophyte...
Abstract The Southern Ocean paleoceanography provides key insights into how iron fertilization and oceanic productivity developed through Pleistocene ice-ages their role in influencing the carbon cycle. We report a high-resolution record of dust deposition ocean for Antarctic Zone, close to main source, Patagonia. Our deep-ocean records cover last 1.5 Ma, thus doubling that from ice-cores. find 5 15-fold increase during glacials 2 5-fold biogenic silica deposition, reflecting higher...
Submarine glacial landforms in fjords are imprints of the dynamic behaviour marine-terminating glaciers and informative about their most recent retreat phase. Here we use detailed multibeam bathymetry to map Petermann Fjord Nares Strait, northwestern Greenland. A large grounding-zone wedge (GZW) demonstrates that Glacier stabilised at fjord mouth for a considerable time, likely buttressed by an ice shelf. This stability was followed successive backstepping margin down GZW's retrograde...
Abstract Computed tomography (CT) of sediment cores allows for high‐resolution images, three‐dimensional volumes, and down core profiles. These quantitative data are generated through the attenuation X‐rays, which sensitive to density atomic number, stored in pixels as relative gray scale values or Hounsfield units (HU). We present a suite MATLAB™ tools specifically designed routine analysis means standardize better quantify products CT collected on medical scanners. SedCT uses graphical...
Abstract. Petermann Fjord is a deep (>1000 m) fjord that incises the coastline of north-west Greenland and was carved by an expanded Glacier, one six largest outlet glaciers draining modern Ice Sheet (GrIS). Between 5 70 m unconsolidated glacigenic material infills in adjacent Nares Strait, deposited as Strait ice streams retreated through area after Last Glacial Maximum. We have investigated deglacial deposits using seismic stratigraphic techniques correlated our results with...
Calving events of Petermann Glacier, northwest Greenland, in 2010 and 2012 reduced the length its ice tongue by c. 25 km, allowing exploration newly uncovered seafloor during 2015 Expedition. This article presents results foraminiferal analysis environmental data from thirteen surface sediment samples northern Nares Strait Fjord, including beneath modern tongue. is first study living foraminifera an arctic this area. Modern assemblages were studied to constrain species preferences improve...
Scotia Sea and the Drake Passage is key towards understanding development of modern oceanic circulation patterns their implications for ice sheet growth decay. The sedimentary record southern basins documents regional tectonic, oceanographic climatic evolution since Eocene. However, a lack accurate age estimations has prevented calibration reconstructed history. upper was scientifically drilled first time in 2019 during International Ocean Discovery Program (IODP) Expedition 382, recovering...
IODP Site U1537 is located in a contourite deposit the Dove Basin of southeastern Scotia Sea, 3,713 meters water. It consists alternating diatom oozes and silty clays, with variable amounts sand to gravel-sized clasts delivered as IRD.   Shipboard track measurements, weight percent ice-rafted detritus (IRD), 40Ar/39Ar hornblende biotite age (provenance), split core XRF elemental measurements were collected examined study Antarctic ice-sheet dynamics between 1.75 3.35 Ma,...
Abstract Recent changes in US oceanographic assets are impacting scientists' ability to access seafloor and sub‐seafloor materials thus constraining progress on science critical for societal needs. Here we identify national infrastructure needs address questions. This commentary reports community‐driven discussions that took place during the 3‐day FUTURE of Seafloor Sampling Capabilities 2024 Workshop , which used an “all‐hands‐on‐deck” approach assess sampling requirements a broad range...
Abstract. The northern sector of the Greenland Ice Sheet is considered to be particularly susceptible ice mass loss arising from increased glacier discharge in coming decades. However, past extent and dynamics outlet glaciers this region, hence their vulnerability climate change, are poorly documented. In summer 2019, Swedish icebreaker Oden entered previously unchartered waters Sherard Osborn Fjord, where Ryder Glacier drains approximately 2 % Greenland's sheet into Lincoln Sea. Here we...
Abstract International Ocean Discovery Program (IODP) Expedition 382 in the Scotia Sea’s Iceberg Alley recovered among most continuous and highest resolution stratigraphic records Southern near Antarctica spanning last 3.3 Myr. Sites drilled Dove Basin (U1536/U1537) have well‐resolved magnetostratigraphy a strong imprint of orbital forcing their lithostratigraphy. All magnetic reversals Myr are identified, providing robust age model independent tuning. During Pleistocene, alternation...
Abstract. The Petermann 2015 expedition to Fjord and adjacent Hall Basin recovered a transect of cores, extending from Nares Strait underneath the 48 km long ice tongue glacier, offering unique opportunity study ice–ocean–sea interactions at interface these realms. First results suggest that no existed in for large parts Holocene, raising question role ocean marine cryosphere collapse re-establishment tongue. Here we use multi-proxy approach (sea-ice-related biomarkers, total organic carbon...
Abstract Over the last 3.3 million years, Antarctic Ice Sheet (AIS) has undergone phases of ice sheet growth and decay, impacting sea level climate globally. Presently, largely marine‐terminating AIS loses mass primarily by iceberg calving basal melt shelves. Quantifying past rates timing is vital to understanding future cryosphere changes. One proxy for instabilities rafted debris (IRD) fluxes. However, traditional methods IRD quantification are labor‐intensive. Here, we present a new...