A5075101164- Cryospheric studies and observations
- Arctic and Antarctic ice dynamics
- Winter Sports Injuries and Performance
- Climate change and permafrost
- Geology and Paleoclimatology Research
- Methane Hydrates and Related Phenomena
- Climate variability and models
- Icing and De-icing Technologies
- Aerospace Engineering and Energy Systems
- Oceanographic and Atmospheric Processes
- Polar Research and Ecology
- Geological formations and processes
- Microbial Metabolic Engineering and Bioproduction
- Meteorological Phenomena and Simulations
- Ocean Waves and Remote Sensing
- Multi-Agent Systems and Negotiation
- Metabolomics and Mass Spectrometry Studies
- Outsourcing and Supply Chain Management
- Metabolism and Genetic Disorders
- RNA modifications and cancer
- Landslides and related hazards
- Artificial Intelligence in Law
- Ecosystem dynamics and resilience
- Marine and coastal ecosystems
- Folate and B Vitamins Research
Technion – Israel Institute of Technology
2020-2023
Courant Institute of Mathematical Sciences
2013-2019
New York University
2013-2019
Princeton University
2016-2019
NOAA Geophysical Fluid Dynamics Laboratory
2016-2018
Weizmann Institute of Science
2007
Abstract We study a mechanism of iceberg breakup that may act together with the recognized melt and wave‐induced decay processes. Our proposal is based on observations from recent field experiment large ice island in Baffin Bay, East Canada. observed successive collapses overburden above an unsupported wavecut at waterline created submerged foot fringing berg. The buoyancy stresses induced by such be sufficient to cause moderate‐sized bergs break off main A mathematical model developed test...
Abstract Icebergs calved from the Antarctic continent act as moving sources of freshwater while drifting in Southern Ocean. The lifespan these icebergs strongly depends on their original size during calving. In order to investigate effects (if any) calving Ocean, we use a coupled general circulation model with an iceberg component. Iceberg length is varied 62 m up 2.3 km, which typical range used climate models. Results show that increasing leads increase westward transport around...
Ice scallops are a small-scale (5-20cm) quasi-periodic ripple pattern that occurs at the ice-water interface. Previous work has suggested form due to self-reinforcing interaction between an evolving ice-surface geometry, adjacent turbulent flow field, and resulting differential melt rates occur along In this study, we perform series of laboratory experiments in refrigerated flume quantitatively investigate mechanisms scallop formation evolution high resolution. Using particle-image...
Key Points There is an annual intrusion of warm water beneath the McMurdo ice shelf This causes elevated melt rates near to front The intruding surface originating west Ross Sea Polynya
Abstract Icebergs and glacial meltwater have been observed to significantly affect chlorophyll concentrations, primary production, particle export locally, yet the quantitative influence of iron on carbon cycle Southern Ocean remains unknown. We analyze impact icebergs in a global Earth System Model. consider several simulations spanning low high bounds current estimates concentration. find that input produces best agreement with distributions. These results indicate about 30% is, flux...
Abstract Monitoring of ice-shelf and sub-ice-shelf ocean temperatures represents an important component in understanding ice-sheet stability. Continuous monitoring is challenging due to difficult surface access, difficulties penetrating the ice shelf, need for long-term operation non-recoverable sensors. We aim develop rapid lightweight drilling near-continuous fiber-optic temperature-monitoring methods meet these challenges. During November 2011, two instrumented moorings were installed...
Abstract Temperature and salinity data collected around grounded tabular icebergs in Baffin Bay 2011, 2012, 2013 indicate wind‐induced upwelling at certain locations the icebergs. These suggest that along one side of iceberg, wind forcing leads to Ekman transport away from which causes cool saline water below. The mixes with above thermocline, causing mixed layer become cooler more saline. Along opposite surface moves towards a sharpening thermocline as warm fresh is trapped near surface....
Abstract We used a terrestrial radar interferometer (TRI) at Helheim Glacier, Greenland, in August 2013, to study the effects of tidal forcing on terminal zone this tidewater glacier. During our period, glacier velocity was up 25 m d –1 . Our measurements show that moves out phase with semi-diurnal tides and densely packed melange fjord. Here detrended displacement lags behind forecasted height by ∼8 hours. The transition lag between happens within narrow (∼500 m) fjord front ice cliff. TRI...
Abstract Measuring basal melting of ice shelves is challenging and represents a critical component toward understanding ocean‐ice interactions climate change. In November 2011, moorings containing fiber‐optic cables for distributed temperature sensing (DTS) were installed through the McMurdo Ice Shelf, Antarctica, (~200 m) extending ~600 m into shelf cavity. The high spatial resolution DTS allows transient monitoring thermal gradient within shelf. near ice‐ocean interface extrapolated to in...
Abstract The interaction between an Antarctic Circumpolar Current–like channel flow and a continental shelf break is considered using eddy-permitting simulations of quasigeostrophic primitive equation model. experimental setup motivated by the West Peninsula. Numerical experiments are performed to study how width slope idealized topography affect characteristics flow. main focus on regime where shelfbreak slightly greater than eddy scale. In this regime, strong baroclinic jet develops...
Abstract This paper describes a new, environmentally friendly drilling technique for making short-and long-term access boreholes in shelf glaciers using lightweight drills. The new was successfully developed installation of small-diameter sensors under the Ross Ice Shelf through ~ 193 m thick ice at Windless Bight, McMurdo Shelf, Antarctica. two were drilled and installed 110 working hours. total weight equipment including power system fuel is <400 kg. Installation possible 1.8– 6 hours...
Abstract Large tabular icebergs calved from Antarctic ice shelves have long lifetimes (due to their large size), during which they drift across distances, altering ambient ocean circulation, bottom‐water formation, sea‐ice and biological primary productivity in the icebergs' vicinity. However, despite importance, current generation of circulation models usually do not represent icebergs. In this study, we develop a novel framework model submerged ocean. framework, are represented by...
The inability to inspect metabolic activities within distinct subcellular compartments has been a major barrier our understanding of eukaryotic cell metabolism. Previous work addressed this challenge by analyzing metabolism in isolated organelles, which grossly bias activity. Here, we describe method for inferring physiological fluxes and metabolite concentrations mitochondria cytosol based on isotope tracing experiments performed with intact cells. This is made possible computational...
Abstract Most ocean climate models do not represent ice shelf calving in a physically realistic way, even though the of icebergs is major component mass balance for Antarctic shelves. The infrequency large events together with difficulty placing observational instruments around means that little known about how affect ocean. In this study we present novel model an coupled to circulation model, where constructed Lagrangian elements allow simulation iceberg calving. used simulate flow beneath...
Abstract A formal analytic perturbation expansion in the β term is carried out for Rossby wave solution of shallow‐water equations a zonal channel on β‐plane. Apart from quantization meridional number, presence boundaries alters, to first order, both velocity and geopotential structures but does not alter phase speed wave. The ageostrophic component field identical order with that unbounded β‐plane therefore related boundaries. In contrast, first‐order correction geostrophic inherently walls...
In various multi-agent negotiation settings, a negotiator's utility depends, either partially or fully, on the sum of negotiators' utilities (i.e., social welfare). While need for effective negotiating-agent designs that take into account welfare has been acknowledged in recent work, and even established as category automated negotiating agent competitions, very few have proposed to date. this paper, we present design principles results an extensive evaluation HerbT+, aiming maximize linear...