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Fusion of Altimetry and Digital Elev...

Narkevic, David Ash.

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Fusion of Altimetry and Digital Elevation Models for Change Detection at the Northeast Greenland Ice Stream.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Fusion of Altimetry and Digital Elevation Models for Change Detection at the Northeast Greenland Ice Stream./
作者:	Narkevic, David Ash.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
面頁冊數:	189 p.
附註:	Source: Dissertations Abstracts International, Volume: 82-09, Section: B.
Contained By:	Dissertations Abstracts International82-09B.
標題:	Geology. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28314731
ISBN:	9798582509868

Fusion of Altimetry and Digital Elevation Models for Change Detection at the Northeast Greenland Ice Stream.
Narkevic, David Ash.

Fusion of Altimetry and Digital Elevation Models for Change Detection at the Northeast Greenland Ice Stream. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 189 p.

Source: Dissertations Abstracts International, Volume: 82-09, Section: B.

Thesis (Ph.D.)--State University of New York at Buffalo, 2021.

This item must not be sold to any third party vendors.

Nioghalvfjerdsfjorden (N79) Glacier is one of the two outlets of the Northeast Greenland Ice Stream (NEGIS), the only large ice stream of the Greenland Ice Sheet, which drains approximately 12% of its surface area and containing a sea-level rise equivalent of 1.1 m. Until recently it was believed that N79's floating ice shelf would be stable for more than a century, but thinning was detected at altimetry flightline crossovers near its grounding line using the Surface Elevation Reconstruction and Change Detection (SERAC) method. To further explore this, we use the novel Mosaic Utility and Large Dataset Integration for SERAC (MOULINS) algorithm with high resolution digital elevation models (DEMs) from the Worldview satellites and altimetry from the Airborne Topographic Mapper (ATM) and ICESat to complete a high accuracy annual reconstruction of the NEGIS outlet region between 2012 and 2017. Lagrangian elevation differences reveal a zone of thinning near the grounding line, especially concentrated in a channel extending from the grounding line and curving to meet a fracture, which appeared between 2012 and 2014 and has surface thinning rates that can exceed 10 meters per year. A series of earlier fractures and depressions further downstream suggest this process has been repeated multiple times, with increasingly intense channel formation. We suspect that as surface runoff and ocean temperature increase, the effect of fractures and channels near the N79 grounding line will be enhanced, potentially leading to destabilization of the ice shelf.

ISBN: 9798582509868Subjects--Topical Terms:

516570
Geology.
Subjects--Index Terms:

Altimetry

Fusion of Altimetry and Digital Elevation Models for Change Detection at the Northeast Greenland Ice Stream.
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300 $a 189 p.
500 $a Source: Dissertations Abstracts International, Volume: 82-09, Section: B.
500 $a Advisor: Csatho, Beata.
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506 $a This item must not be sold to any third party vendors.
520 $a Nioghalvfjerdsfjorden (N79) Glacier is one of the two outlets of the Northeast Greenland Ice Stream (NEGIS), the only large ice stream of the Greenland Ice Sheet, which drains approximately 12% of its surface area and containing a sea-level rise equivalent of 1.1 m. Until recently it was believed that N79's floating ice shelf would be stable for more than a century, but thinning was detected at altimetry flightline crossovers near its grounding line using the Surface Elevation Reconstruction and Change Detection (SERAC) method. To further explore this, we use the novel Mosaic Utility and Large Dataset Integration for SERAC (MOULINS) algorithm with high resolution digital elevation models (DEMs) from the Worldview satellites and altimetry from the Airborne Topographic Mapper (ATM) and ICESat to complete a high accuracy annual reconstruction of the NEGIS outlet region between 2012 and 2017. Lagrangian elevation differences reveal a zone of thinning near the grounding line, especially concentrated in a channel extending from the grounding line and curving to meet a fracture, which appeared between 2012 and 2014 and has surface thinning rates that can exceed 10 meters per year. A series of earlier fractures and depressions further downstream suggest this process has been repeated multiple times, with increasingly intense channel formation. We suspect that as surface runoff and ocean temperature increase, the effect of fractures and channels near the N79 grounding line will be enhanced, potentially leading to destabilization of the ice shelf.
590 $a School code: 0656.
650 4 $a Geology. $3 516570
650 4 $a Environmental science. $3 677245
650 4 $a Computational physics. $3 3343998
653 $a Altimetry
653 $a Digital Elevation Models
653 $a Glaciers
653 $a Greenland
653 $a Ice streams
653 $a Nioghalvfjerdsfjorden Glacier
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690 $a 0768
690 $a 0216
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791 $a Ph.D.
792 $a 2021
793 $a English
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