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 88 for “"ice-cover"”.
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Water Quality Changes Under Ice Cover in Northern Prairie Lakes
Water quality changes under ice cover were studied in seven northern prairie lakes. The lakes are high in dissolved materials and exist essentially as closed systems during the winter months. Ice cover ranging from 53 to 86 cm developed on the lakes. Melted ice samples showed small amounts of …
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Dynamics of Ocean Waves in a Continuous Sea Ice Cover
Waves and swell incident on a continuous cover of sea ice can become coupled to the ice and propagate as flexural-gravity waves. These ice-coupled waves are determined by a dispersion equation and attenuation coefficient which depend critically on the material properties of the sea ice. Two models …
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Studies of the Arctic Ocean sea ice cover and hydrothermal heat fluxes
Since reliable ice extent estimates from satellite data became available in 1979 the Arctic sea ice cover has followed a declining long term trend. Over the last decade the decline has accelerated with record low sea ice extents recorded in 2002, 2005, 2007 and 2012. In order to explain the …
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Sea Ice Cover Deformation on the Local Scale and Mesoscale and Its Relationship to Atmosphere-Ocean Processes
This thesis is concerned with the study of sea ice cover deformation caused by the processes in the atmosphere and ocean. Only a modest number of studies has addressed the cross-scale analysis of the ice deformation. The aim of the present research has two foci: to investigate the variability of …
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Climate Change in Buffalo, NY
… be freezing at a later date, and Lake Erie’s ice cover should affect snowfall amounts. The warmer temperatures would lead to Lake Erie’s surface water temperature being higher, resulting in less ice cover. The lack of ice would lead to more lake effect snow over Buffalo. The city of Buffalo, …
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Seasons in the Stream: River Ecosystem Phenology in a Changing Climate
… river (Chapter 3), and in evaluating whether ice cover determines patterns of primary productivity along a river continuum (Chapter 4). Finally, I provide a framework for evaluating how climate change may be impacting the patterns of primary productivity in rivers (Chapter 5). In Chapter 2, we …
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On optical and physical properties of sea ice in the Baltic Sea
Sea ice has been recognized as one of the key elements of polar and sub-polar seas, including Baltic Sea. The existence of sea ice cover and its properties have influence to many aspects of marine biology, climate and seafaring. This thesis is concentrated on describing physical and optical …
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Ambient acoustics as indicator of environmental change in the Beaufort Sea: experiments & methods for analysis
… are primarily dependent on properties of the ice cover and water column. The first component of this work examines the effect on ambient noise characteristics due to changes to the Beaufort Sea sound speed profile (SSP) and ice cover. Specifically, the emergence of a warm water intrusion near …
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Ambient Acoustics as Indicator of Environmental Change in the Beaufort Sea: Experiments & Methods for Analysis
… are primarily dependent on properties of the ice cover and water column. The first component of this work examines the effect on ambient noise characteristics due to changes to the Beaufort Sea sound speed profile (SSP) and ice cover. Specifically, the emergence of a warm water intrusion near …
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Microwave remote sensing of young sea ice in the Greenland Sea
… and two research cruises showed the Odden ice tongue in the Greenland Sea to consist predominantly of young sea ice in the form of frazil and pancake ice. These young ice types have been implicated in the preconditioning of the ocean for deep ventilation. Satellite-borne microwave …
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A Coupled Atmosphere - Sea Ice Model Study of the Role of Sea Ice in Climatic Predictability
… 10 simulations with a coupled atmosphere-sea ice model are made and a 30-day mean climatic state is calculated for each ensemble for the period of November 11 to December 10. Initially, the light ice ensemble has a thick ice cover extending southward to 75(DEGREES)N. The heavy ice ensemble …
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Detecting and Modeling Landfast Ice in the Alaskan Bering Sea
Seasonal sea ice – ice which freezes in late fall and melts completely the following summer – is a central feature in the ecology, geomorphology, and climatology of the Bering Sea. In this region's coastal zones, sea ice becomes locked into a stationary position against the coastlines to become …
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Growth and motion at the Weddell Sea ice edge
The formation of sea ice in the presence of turbulence was studied using data from drifting buoy<br/>deployments and ice sampling in the Weddell Sea during April 2000. The study sought to<br/>improve understanding of pancake ice in terms of dynamics, heat fluxes, ice growth rates …
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Limnological and paleolimnological investigations of environmental change in three distinct ecosystem types, Canadian High Arctic
… in the early 20th century. Differences in ice cover have often been invoked to explain differences in the timing and magnitude of diatom shifts in the Arctic, but this hypothesis has not been explicitly tested. In Chapter 6, I compare two adjacent lakes with similar physical characteristics …
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An investigation of wind- and wave-driven dynamics in Antarctic sea ice from multiple types of buoy arrays
The advance and retreat of Antarctic sea ice is the largest annually recurring event on Earth, and a significant portion of its natural variability appears to be associated with synoptic variability. Therefore, attaining a comprehensive understanding of both the dynamic and thermodynamic processes …
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Ambient noise measurements in the 200-300 Hz band during the Greenland Sea tomography experiment
… that same year by the British Meteorological Office. Time series of ice type and ice concentration were provided by Special Sensor Microwave Imager and Advanced Very High Resolution Radiometer satellite. Using those data sets, we were able to look at the characteristics of the ambient noise and …
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Effects of Air Temperature and Lake Ice on Snowfall on the South Shore of Lake Superior
… the south shore). This study assesses decreasing ice cover of Lake Superior and its effects upon synoptic weather factors. Data were collected from eleven National Weather Service (NWS) stations located on the south shore of the lake. Rainfall and snowfall amounts from December to May were …
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Ice - ocean - atmosphere interactions in the Southern Ocean and implications for phytoplankton phenology
The annual advance and retreat of sea ice in the Southern Ocean is recognised as one of the largest seasonal events on Earth. Such considerable physical changes have profound effects on the vertical structure of the water column, and hence controls the availability of both light and nutrients to …
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Cyclone climatology of the Great Lakes
… Great Lakes region with significant impacts on ice cover, thermal structure, water quality, aquatic life, shipping, and shoreline property. For this research, a historical cyclone dataset was constructed for the period 1900 to 1990. This dataset was used to address the following five research …
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Analysis of Cisco (Coregonus artedi) Populations in Eastern Lake Ontario
… could represent a factor limiting population recovery in this region: fisheries-induced alterations to life-history traits, and fluctuations in year-class strength. In order to identify whether fisheries-induced change has occurred in this population, I compared the size-at-age and maturation of …
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