Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 30 for “"Arctic sea ice"”.
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Production and preservation of the Arctic sea ice diatom biomarker IP25
The presence of the sea ice biomarker IP25 in Arctic marine sediments has previously been used as a proxy measure of past sea ice conditions in the Arctic. Although the sea ice diatom origin of IP25 was established previously, the nature of its production within sea ice, along with its transport …
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Identification of variability in sub-arctic sea ice conditions during the Younger Dryas and Holocene
The presence of the sea ice diatom biomarker IP25 in Arctic marine sediments has been used in previous studies as a proxy for past spring sea ice occurrence and as an indicator of wider palaeoenvironmental conditions for different regions of the Arctic over various timescales. The current study …
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Aerosols and boundary layer structure over Arctic sea ice based on airborne lidar and dropsonde measurements
The atmosphere over the Arctic Ocean is strongly influenced by the distribution of sea ice and open water. Leads in the sea ice produce strong convective fluxes of sensible and latent heat and release aerosol particles into the atmosphere. They increase the occurrence of clouds and modify the …
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The influence of Arctic sea-ice loss on mid-latitude weather and climate: exploring sensitivities and mechanisms
Over the past few decades, Arctic sea-ice extent has declined, while there has been an apparent increase in severe winter weather across some mid-latitude regions. This has led to much research into whether these trends are dynamically linked. It has been suggested that the link may involve the …
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Investigating the link between Arctic sea ice, North Pacific geopotential height anomalies, and precipitation across the United States
The student, Zachary Zobel, submitted this Thesis for approval on 2015-07-15 at 22:36.
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The Combined Role of ENSO-driven Sea Surface Temperature Variation and Arctic Sea Ice Extent in Defining Climate Conditions in the Southwestern United States
Previous research indicates that future reductions in Arctic sea ice cover (SIC) could alter storm tracks and precipitation patterns in western North America and negatively impact water resources in the American southwest. Other research suggests that multiple periods of increased precipitation …
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Towards basin-scale in-situ characterization of sea-ice using an Autonomous Underwater Glider
… is intended for basin-scale unattended survey of Arctic sea-ice. The distinguishing challenge for AUG operations in the Arctic environment is the presence of year-round sea-ice cover which prevents vehicle surfacing for localization updates and shore-side communication. Due to the high cost of …
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Arctic Cloud, Radiation and their Interactions with Sea Ice
Over the past few decades, the Arctic has experienced dramatic changes, the most recognized being the amplified warming and substantial decline in both sea ice coverage and thickness at impressive rates. The cloud-radiation feedback is believed to be one of the critical reasons for Arctic sea ice …
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Tipping Points in Stochastically Perturbed Linear Filippov Systems
… is motivated by a recent model of energy flux in Arctic sea ice. We determine the most probable tipping events using path integral techniques. Specifically, we calculate local minimizes of the Onsager-Machlup functional using solutions to the corresponding Euler-Lagrange equations and a gradient …
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Icy futures : carving the northern sea route
The research examines intersections between globalisation and climate change in the (re)emergence of a 'Northern Sea Route' through the Russian Arctic, which some speculate could soon rival or replace the Suez Canal as major global trade artery. The research explores shifts in the contemporary …
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Reversibility of Sea Ice and Climate under Global Change
… Motivated by recent satellite observations of Arctic sea ice age, we investigate how the properties of first-year and multiyear ice regulate sea ice area and volume. Using an autoregressive model of sea ice and numerical simulation with a global dynamic-thermodynamic sea ice model that traces …
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The flow and variability of sea-ice in the Canadian Arctic Archipelago: modelling the past (1950-2004) and the future (2041-2060)
Considering the recent losses observed in Arctic sea-ice and the anticipated future warming due to anthropogenic greenhouse gas emissions, sea-ice retreat in the Canadian Arctic Archipelago (CAA) is expected. As most global climate models do not resolve the CAA region, a fine-resolution regional …
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The Influence of heat transport on Arctic amplification
The Arctic surface air temperature has warmed nearly twice as much as the global mean since the mid-20th century. Arctic sea ice has also been declining rapidly in recent decades. There is still discussion about how much of this Arctic amplification is caused by local factors, such as changes in …
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Black magnetic spherules from the glacial and sea ice of Fletcher's Ice Island (T-3)
… cosmic sources. Spherules from both the glacial ice and sea ice of Fletcher's Ice Island (T-3) were studied to determine their size distribution, sedimentation rates, and other parameters. The results were examined and shown to be similar to those of other researchers' work elsewhere. …
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Reconstruction of recent and palaeo sea ice conditions in the Barents Sea
… branched isoprenoid alkene derived from certain Arctic sea ice diatoms that, when detected in marine sediments, has been used as a proxy for past Arctic sea ice over the last decade. In the current study, the structure of this biomarker was determined following large-scale extraction from …
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NUMERICAL MODELING OF THE VERTICAL HEAT TRANSPORT THROUGH THE DIFFUSIVE LAYER OF THE ARCTIC OCEAN
The Arctic Ocean has been a subject of increasing interest in recent years due to the reduction of the sea-ice thickness and spatial coverage and its implications for climate change. The future state of the Arctic is likely to be linked to vertical heat transport by microscale processes, …
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Dynamics of the geomagnetically disturbed ionosphere as measured by GPS receivers and SuperDARN HF radars
… rates are calculated for comparison with Arctic sea ice boundaries derived from satellite observations, showing reduced backscatter from regions covered by ice.
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Advancing Arctic coastal erosion measurement and monitoring through UAV-SfM, satellite imagery, and object-based image analysis
Arctic coasts are vast, representing 30-34% of Earth’s coastline and exhibit some of the highest rates of erosion in the World due to the presence of permafrost. Rates of erosion are expected to increase with warming air and water temperatures, reductions in Arctic sea ice extent and duration, sea …
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Risk of Ship Strike and Noise Pollution to Cetaceans in the Bering Strait
As the Arctic sea ice extent decreases due to global climate change, new commercial shipping routes are opening through the Arctic. All of these routes connect the Arctic Ocean to the Pacific Ocean through the Bering Strait, a bottleneck region between Alaska and Russia. This same Strait is …
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The impact of Arctic amplification on the extratropical jets
… 1990's, greenhouse gas forcing has warmed the Arctic at twice the rate of lower latitudes, coinciding with a dramatic decline in Arctic sea ice extent. This manifestation of climate change has ignited a lively and ongoing debate regarding if Arctic warming will significantly influence extreme …
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