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[ subject:"Climate change." ]
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Surface Mass Balance of the Western ...
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Lewis, Gabriel .
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Surface Mass Balance of the Western Greenland Ice Sheet; A Geophysical Investigation.
紀錄類型:
書目-電子資源 : Monograph/item
正題名/作者:
Surface Mass Balance of the Western Greenland Ice Sheet; A Geophysical Investigation./
作者:
Lewis, Gabriel .
出版者:
Ann Arbor : ProQuest Dissertations & Theses, : 2019,
面頁冊數:
121 p.
附註:
Source: Dissertations Abstracts International, Volume: 81-06, Section: B.
Contained By:
Dissertations Abstracts International81-06B.
標題:
Climate change. -
電子資源:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27545564
ISBN:
9781392727201
Surface Mass Balance of the Western Greenland Ice Sheet; A Geophysical Investigation.
Lewis, Gabriel .
Surface Mass Balance of the Western Greenland Ice Sheet; A Geophysical Investigation.
- Ann Arbor : ProQuest Dissertations & Theses, 2019 - 121 p.
Source: Dissertations Abstracts International, Volume: 81-06, Section: B.
Thesis (Ph.D.)--Dartmouth College, 2019.
This item must not be sold to any third party vendors.
The mass balance of the Greenland Ice Sheet (GrIS) in a warming climate is of critical interest in the context of future sea-level rise. An improved understanding of snow accumulation variability will reduce uncertainties in GrIS mass balance models and improve projections of Greenland's contribution to sea-level rise, currently estimated at 0.089 ± 0.03 m by 2100. GrIS mass balance is calculated from remote sensing, in situ measurements, and regional climate models (RCMs). Many of the RCM's are validated with snow pits and ice cores, such as the 1997 - 1998 Program for Regional Climate Assessment campaign, which predate the recent period of accelerated Greenland surface melting.I investigate recent accumulation changes across interior GrIS using the NASA Operation IceBridge accumulation radar. I analyze the percolation zone using 400 MHz ground penetrating radar connecting 16 shallow (25 - 33 m long) firn cores from the 2016 - 2017 Greenland Traverse for Accumulation and Climate Studies. I validate these surface mass balance (SMB) records with previously collected ice cores and NASA IceBridge accumulation and snow radar platforms. Our 4436 km of radar data and 16 firn cores provide an updated accumulation record to gain further insight into how SMB has changed over the past several decades. Finally, I investigate mechanisms controlling GrIS albedo using in situ spectral albedo, optical grain size, and impurity measurements. These concentrations are not significant to affect albedo in this region. However, measured optical grain sizes vary significantly and could lower albedo by several percent after sufficient grain metamorphism. I show that stronger atmospheric Greenland blocking and increased incoming shortwave radiation has reduced precipitation and increased grain size over the western GrIS, extending the snow grains' surface exposure time and lowering broadband albedo. The results of this project have the potential to validate RCMs, add to the understanding of changing GrIS SMB, and correlate climatic indices with decreased GrIS SMB over the past several decades. Our observed decrease in precipitation from firn core and geophysical data, coupled with systematic albedo reduction, has significantly reduced GrIS SMB and could continue to do so if Greenland blocking remains strong in the future.
ISBN: 9781392727201Subjects--Topical Terms:
2079509
Climate change.
Subjects--Index Terms:
Climate change
Surface Mass Balance of the Western Greenland Ice Sheet; A Geophysical Investigation.
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The mass balance of the Greenland Ice Sheet (GrIS) in a warming climate is of critical interest in the context of future sea-level rise. An improved understanding of snow accumulation variability will reduce uncertainties in GrIS mass balance models and improve projections of Greenland's contribution to sea-level rise, currently estimated at 0.089 ± 0.03 m by 2100. GrIS mass balance is calculated from remote sensing, in situ measurements, and regional climate models (RCMs). Many of the RCM's are validated with snow pits and ice cores, such as the 1997 - 1998 Program for Regional Climate Assessment campaign, which predate the recent period of accelerated Greenland surface melting.I investigate recent accumulation changes across interior GrIS using the NASA Operation IceBridge accumulation radar. I analyze the percolation zone using 400 MHz ground penetrating radar connecting 16 shallow (25 - 33 m long) firn cores from the 2016 - 2017 Greenland Traverse for Accumulation and Climate Studies. I validate these surface mass balance (SMB) records with previously collected ice cores and NASA IceBridge accumulation and snow radar platforms. Our 4436 km of radar data and 16 firn cores provide an updated accumulation record to gain further insight into how SMB has changed over the past several decades. Finally, I investigate mechanisms controlling GrIS albedo using in situ spectral albedo, optical grain size, and impurity measurements. These concentrations are not significant to affect albedo in this region. However, measured optical grain sizes vary significantly and could lower albedo by several percent after sufficient grain metamorphism. I show that stronger atmospheric Greenland blocking and increased incoming shortwave radiation has reduced precipitation and increased grain size over the western GrIS, extending the snow grains' surface exposure time and lowering broadband albedo. The results of this project have the potential to validate RCMs, add to the understanding of changing GrIS SMB, and correlate climatic indices with decreased GrIS SMB over the past several decades. Our observed decrease in precipitation from firn core and geophysical data, coupled with systematic albedo reduction, has significantly reduced GrIS SMB and could continue to do so if Greenland blocking remains strong in the future.
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http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27545564
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