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Glaciological control of ice shelf b...

Little, Christopher M.

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Glaciological control of ice shelf basal melting, and implications for the coupled response.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Glaciological control of ice shelf basal melting, and implications for the coupled response./
作者:	Little, Christopher M.
面頁冊數:	150 p.
附註:	Source: Dissertation Abstracts International, Volume: 71-06, Section: B, page: 3559.
Contained By:	Dissertation Abstracts International71-06B.
標題:	Climate Change. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3410899
ISBN:	9781124047553

Glaciological control of ice shelf basal melting, and implications for the coupled response.
Little, Christopher M.

Glaciological control of ice shelf basal melting, and implications for the coupled response. - 150 p.

Source: Dissertation Abstracts International, Volume: 71-06, Section: B, page: 3559.

Thesis (Ph.D.)--Princeton University, 2010.

Observations and model simulations underscore the importance of ice shelf basal melting to the century-timescale response of ice sheets to climate. In this dissertation, I examine ocean dynamics under ice shelves, interpret the circulation's impact on the localization of ice-ocean thermodynamic fluxes, test the sensitivity of these processes to changed thermal forcing and ice shelf shape, and investigate the glaciological response to localized melting. These studies employ idealized numerical models, with the aim of isolating key physical controls and developing broadly applicable results.

ISBN: 9781124047553Subjects--Topical Terms:

894284
Climate Change.

Glaciological control of ice shelf basal melting, and implications for the coupled response.
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245 1 0 $a Glaciological control of ice shelf basal melting, and implications for the coupled response.
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500 $a Source: Dissertation Abstracts International, Volume: 71-06, Section: B, page: 3559.
500 $a Advisers: Michael Oppenheimer; Anand Gnanadesikan; Allan Rubin.
502 $a Thesis (Ph.D.)--Princeton University, 2010.
520 $a Observations and model simulations underscore the importance of ice shelf basal melting to the century-timescale response of ice sheets to climate. In this dissertation, I examine ocean dynamics under ice shelves, interpret the circulation's impact on the localization of ice-ocean thermodynamic fluxes, test the sensitivity of these processes to changed thermal forcing and ice shelf shape, and investigate the glaciological response to localized melting. These studies employ idealized numerical models, with the aim of isolating key physical controls and developing broadly applicable results.
520 $a In conjunction with rotation and stratification, ice shelf morphology exerts control on both deep and shallow (near-ice shelf) circulation and thus the localization of ice-ocean thermodynamic fluxes. If ice shelf thickness is uniform transverse to ice flow, four distinct mechanisms focus melting near grounding lines: the pressure-dependent seawater freezing point, the large-scale vertical distribution of heat in the water column, slope-dependent entrainment into thin near-ice mixed layers, and a reinforcing glaciological response. The role of rotation in governing the melting distribution depends on the availability of heat: if heat is sequestered at depth, a deep cyclonic circulation controls ice-ocean heat flux; if heat is present near the ice shelf, strong along-slope flow near the ice shelf base drives melting. With more complex ice shelf morphology, these focusing mechanisms manifest at smaller scales.
520 $a In general, melt rates exhibit an approximately linear dependence on local ice shelf basal slope that varies depending on advective heat fluxes and stratification. Incorporating a slope-dependent parameterization of basal melting into an ice shelf/stream model indicates that steady glaciological configurations are possible across a wide range of slope-dependent melt rates. Rapid, localized, melt-driven changes in ice shelf shape exert an impact on grounded ice at longer timescales. The importance of localized basal melting may add an additional burden on large and small-scale models and observations, yet it may also focus these efforts, which are required to interpret recent ice sheet changes and make future projections of sea level.
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790 1 0 $a Rubin, Allan, $e advisor
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