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Surface melting on ice shelves and i...

Sergienko, Olga V.

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Surface melting on ice shelves and icebergs.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Surface melting on ice shelves and icebergs./
Author:	Sergienko, Olga V.
Description:	108 p.
Notes:	Adviser: Douglas R. MacAyeal.
Contained By:	Dissertation Abstracts International66-11B.
Subject:	Geophysics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3195062
ISBN:	9780542405747

Surface melting on ice shelves and icebergs.
Sergienko, Olga V.

Surface melting on ice shelves and icebergs. - 108 p.

Adviser: Douglas R. MacAyeal.

Thesis (Ph.D.)--The University of Chicago, 2005.

Disintegration of Larsen Ice Shelf A and B, in 1995 and 2002, respectively, were preceded by two decades of extended summer melt seasons and by surface melt-water accumulation in ponds, surface crevasses and depressions produced by the elastic flexure of the ice. The extraordinary rapidity of ice-shelf fragmentation into large iceberg plumes following the appearance of surface melt water implies that the mechanical effects of surface melt water accumulation may represent an unforeseen process allowing abrupt, large-scale change of Antarctica's ice mass. The present study of surface melting and subsequent movement of melt water, both vertically (i.e., downward percolation into underlying firn) and horizontally (e.g., into crevasses and surface depressions created by ice-shelf flexure in response to both side boundary conditions and the melt-water load itself), is motivated by the need to further describe the energy, mass and momentum balances associated with ice shelves and their surrogates-large tabular icebergs-in the face of unprecedented changes in surface mass balance. The goal of this dissertation is to examine both the thermodynamic and mechanical aspects of surface melting on ice shelves and icebergs subject to sudden changes in climate conditions (e.g ., global warming). Thermodynamic aspects of the study include the development and application of surface energy balance models capable of describing the process of surface melting and subsequent vertical movement of melt water through a porous firn. Mechanical aspects of this study include the analysis of vertical melt-water flow, and more particularly, the elastic flexure response of the ice shelf or iceberg to the melt-water loads. Work presented here involves three methodologies, numerical modeling, field observation, and mathematical analysis (e.g., development of analytic solutions to simple, idealized ice-shelf flexure problems).

ISBN: 9780542405747Subjects--Topical Terms:

535228
Geophysics.

Surface melting on ice shelves and icebergs.
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020 $a 9780542405747
035 $a (UMI)AAI3195062
035 $a AAI3195062
040 $a UMI $c UMI
100 1 $a Sergienko, Olga V. $3 1270424
245 1 0 $a Surface melting on ice shelves and icebergs.
300 $a 108 p.
500 $a Adviser: Douglas R. MacAyeal.
500 $a Source: Dissertation Abstracts International, Volume: 66-11, Section: B, page: 5869.
502 $a Thesis (Ph.D.)--The University of Chicago, 2005.
520 $a Disintegration of Larsen Ice Shelf A and B, in 1995 and 2002, respectively, were preceded by two decades of extended summer melt seasons and by surface melt-water accumulation in ponds, surface crevasses and depressions produced by the elastic flexure of the ice. The extraordinary rapidity of ice-shelf fragmentation into large iceberg plumes following the appearance of surface melt water implies that the mechanical effects of surface melt water accumulation may represent an unforeseen process allowing abrupt, large-scale change of Antarctica's ice mass. The present study of surface melting and subsequent movement of melt water, both vertically (i.e., downward percolation into underlying firn) and horizontally (e.g., into crevasses and surface depressions created by ice-shelf flexure in response to both side boundary conditions and the melt-water load itself), is motivated by the need to further describe the energy, mass and momentum balances associated with ice shelves and their surrogates-large tabular icebergs-in the face of unprecedented changes in surface mass balance. The goal of this dissertation is to examine both the thermodynamic and mechanical aspects of surface melting on ice shelves and icebergs subject to sudden changes in climate conditions (e.g ., global warming). Thermodynamic aspects of the study include the development and application of surface energy balance models capable of describing the process of surface melting and subsequent vertical movement of melt water through a porous firn. Mechanical aspects of this study include the analysis of vertical melt-water flow, and more particularly, the elastic flexure response of the ice shelf or iceberg to the melt-water loads. Work presented here involves three methodologies, numerical modeling, field observation, and mathematical analysis (e.g., development of analytic solutions to simple, idealized ice-shelf flexure problems).
590 $a School code: 0330.
650 4 $a Geophysics. $3 535228
690 $a 0373
710 2 $a The University of Chicago. $3 1017389
773 0 $t Dissertation Abstracts International $g 66-11B.
790 $a 0330
790 1 0 $a MacAyeal, Douglas R., $e advisor
791 $a Ph.D.
792 $a 2005
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3195062