Kohout, Alison - Revision history

Akohout at 23:50, 23 April 2006

2006-04-23T23:50:19Z

← Older revision		Revision as of 23:50, 23 April 2006
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	The sea-ice which forms in the polar oceans plays a key role in driving the world's oceanic		The sea-ice which forms in the polar oceans plays a key role in driving the world's oceanic
	circulatory system and hence the world's climatic system. It is therefore important to		circulatory system and hence the world's climatic system. It is therefore important to
	understand the processes which influence the extent of this sea-ice. [[~~squire_95~~ \| Squire 95]] and wadhams00		understand the processes which influence the extent of this sea-ice. [[Squire_95 \| Squire 95]] and wadhams00
	have evidence suggesting that ocean waves play a major role in the fracturing of		have evidence suggesting that ocean waves play a major role in the fracturing of
	ice-covered seas. The analysis of this phenomena involves many complicated variables and		ice-covered seas. The analysis of this phenomena involves many complicated variables and

Akohout at 23:48, 23 April 2006

2006-04-23T23:48:33Z

← Older revision		Revision as of 23:48, 23 April 2006
Line 5:		Line 5:
	The sea-ice which forms in the polar oceans plays a key role in driving the world's oceanic		The sea-ice which forms in the polar oceans plays a key role in driving the world's oceanic
	circulatory system and hence the world's climatic system. It is therefore important to		circulatory system and hence the world's climatic system. It is therefore important to
	understand the processes which influence the extent of this sea-ice. ~~\citet{squire95,~~wadhams00}		understand the processes which influence the extent of this sea-ice. [[squire_95 \| Squire 95]] and wadhams00
	have evidence suggesting that ocean waves play a major role in the fracturing of		have evidence suggesting that ocean waves play a major role in the fracturing of
	ice-covered seas. The analysis of this phenomena involves many complicated variables and		ice-covered seas. The analysis of this phenomena involves many complicated variables and

Akohout at 23:40, 23 April 2006

2006-04-23T23:40:24Z

@@ Line 10: / Line 10: @@
 considerable idealisation is required.  One aspect which is critical to understand is the
 decay of wave energy through the Marginal Ice Zone (MIZ).
 A number of models for wave propagation in the marginal ice zone have been presented. The
@@ Line 34: / Line 28: @@
 a series of experiments which were performed by \citet{sakai_hanai02}  using floating plastic sheets
 in a two-dimensional wave tank. We are therefore confident that the numerical
 solution presented here is correct.

Akohout at 23:13, 23 April 2006

2006-04-23T23:13:04Z

← Older revision		Revision as of 23:13, 23 April 2006
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	Research topic: Two dimensional wave scattering in the MIZ		Research topic: Two dimensional wave scattering in the MIZ

			The sea-ice which forms in the polar oceans plays a key role in driving the world's oceanic
			circulatory system and hence the world's climatic system. It is therefore important to
			understand the processes which influence the extent of this sea-ice. \citet{squire95,wadhams00}
			have evidence suggesting that ocean waves play a major role in the fracturing of
			ice-covered seas. The analysis of this phenomena involves many complicated variables and
			considerable idealisation is required. One aspect which is critical to understand is the
			decay of wave energy through the Marginal Ice Zone (MIZ).

			The MIZ is an interfacial region which forms at the boundary of open and frozen oceans. It consists
			of a vast field of ice floes and is subject to considerable wave action due to its proximity
			to the open ocean. Experiments have shown that the wave intensity decays exponentially with
			distance from the open ocean and that this rate of decay is highly dependent on the
			wave period \citep{directional86,attenuation88}.

			A number of models for wave propagation in the marginal ice zone have been presented. The
			most sophisticated were the fully three dimensional models using a coupling of solutions
			for individual ice floes with a transport equation \citep{Masson_Le,jgrrealism}. These
			models, which were derived separately, have been recently shown to be almost identical
			\citep{ocean_modelling06}. Another three-dimensional model was developed by
			\citet{dixon_squire01} based on the coherent potential approximation. We present here
			a much simpler model based on a two-dimensional solution. Although much simpler, this
			model has a number of advantages over the three-dimensional models, the most important
			being that it is much less computationally demanding. We also believe that a simple model
			is the best place to begin to make comparisons with data and to test and debug the more
			sophisticated models.

			The two-dimensional solution is based on a matched eigenfunction expansion. The model
			is described in detail in \citet{elastic_plates06} where the solution is carefully
			analysed for energy conservation, compared with previous results and compared to
			a series of experiments which were performed by \citet{sakai_hanai02} using floating plastic sheets
			in a two-dimensional wave tank. We are therefore confident that the numerical
			solution presented here is correct.

			In this paper, we describe the two dimonsional model and analyse it in repsect to the MIZ.
			We compare our results against a series of field experiments carried
			out by the Scott Polar Research Institute (SPRI) to measure wave energy attenuation rates
			in the marginal ice zones of the Greenland and Bering Seas. These field experiments are the only
			ones of their kind and are further discussed in \citet{wadhams_squire88}.

Akohout at 23:02, 23 April 2006

2006-04-23T23:02:06Z

New page

'''Alison Kohout (PHD student)'''

Research topic: Two dimensional wave scattering in the MIZ