i
Crevasses as Indicators of Surge Dynamics in the Bering Bagley Glacier System, Alaska: Numerical Experiments and Comparison to Image Data Analysis
-
2018
Source: JGR Earth Surface 123(8): 1615-1637
[PDF-6.59 MB]
Select the Download button to view the document
This document is over 5mb in size and cannot be previewed
Details:
-
Journal Title:Journal of Geophysical Research: Earth Surface
-
Personal Author:
-
NOAA Program & Office:
-
Description:One of the largest sources of uncertainty in sea level rise prediction is glacial acceleration, of which the surge phenomenon is the least understood type. The surge of the Bering Bagley Glacier System (BBGS), Alaska, in 2011–2013 has provided a rare opportunity to study the surge phenomenon in a large and complex glacier system. A surge results in widespread crevassing throughout the glacier system complicating many traditional techniques used to study glacier dynamics. In this paper, we utilize crevassing as a means to investigate the recent BBGS surge through numerical modeling and geostatistical data analysis. Following the principles of structural glaciology, image‐based crevasse characterizations are obtained through geostatistical methods applied to Landsat‐7 data, supplemented by airborne field observations. On the modeling side, a 3‐D full‐Stokes finite element model of the BBGS is developed and applied to investigate ice dynamics and surface structures during the recent surge. A von Mises criterion is adopted to simulate crevassing at the glacier surface, oriented along the axes of maximum principal tensile stress. To facilitate evaluation of model‐ and data‐derived crevasse characteristics, three different comparison methods are introduced. General agreement in the model‐data comparisons indicates that the model has the ability to represent the BBGS system during peak acceleration. The crevasse‐based approach is also employed to optimize the basal sliding parameter and the von Mises stress threshold in the model. Results further indicate that bed topography is an important constraint in modeling the surge process.
-
Source:JGR Earth Surface 123(8): 1615-1637
-
Document Type:
-
Place as Subject:
-
Rights Information:Other
-
Compliance:Submitted
-
Main Document Checksum:urn:sha256:a2d3d8621e144eefb257797277e773492a30278633e8cb3c86db8057a2c7d7fa
-
File Type:
Supporting Files
-
No Additional Files
More +
Related Documents
-
Personal Author:Conkling, Megan ;Hesp, Kylie...2019 | Scientific Reports, 9(1)Description:Sponges (Phylum Porifera) are among the oldest Metazoa and considered critical to understanding animal evolution and development. They are also the mo...2018 | Atmos. Meas. Tech., 11, 6539–6576, 2018Description:Since September 2014, NASA's Orbiting Carbon Observatory-2 (OCO-2) satellite has been taking measurements of reflected solar spectra and using them to...Personal Author:Papanastasiou, Dimitrios K. ;Beltrone, Allison...2018 | Atmos. Chem. Phys., 18, 6317–6330, 2018Description:Hydrochlorofluorocarbons (HCFCs) are ozone depleting substances and potent greenhouse gases that are controlled under the Montreal Protocol. However, ...Personal Author:Zerefos, Christos ;Kapsomenakis, John...2018 | Atmos. Chem. Phys., 18, 6427–6440, 2018Description:This paper is focusing on the representativeness of single lidar stations for zonally averaged ozone profile variations over the middle and upper stra...2018 | JGR Atmospheres 123(12): 13611-13621, 2018Description:We assimilate multiple trace gas species within a single high‐resolution Bayesian inversion system to optimize CO2ff emissions for individual source...2019 | Plos One, 14(3)Description:In the 1970s, the introduced silver carp Hypophthalmichthys molitrix (which is indigenous to eastern Asia) escaped from southern U.S. aquaculture to s...Personal Author:Guo, Feiyan ;Liu, Qinyu...2015 | Journal of Climate, (28), 8, 3073-3092Description:Using observational data and phase 5 of the Coupled Model Intercomparison Project (CMIP5) model outputs [the preindustrial (PI) control run of the Com...Personal Author:Zietlow, Daniel W. ;Sheehan, Anne F....2018 | Geosphere (2018) 14 (3): 1343–1364Description:An S-wave tomogram produced from finite-frequency tomography using teleseismic travel-time measurements made on and offshore the South Island of New Z...Personal Author:Finisdore, John ;Rhodes, Charles...2020 | Ecosystem Services, 45Description:Ecosystem services (ES) practitioners (e.g., researchers, policy makers) have been working to better define, measure, and value the ways that nature c...Public Access Available on:January 01, 2030The Role of Localized Compressional Ultra‐low Frequency Waves in Energetic Electron PrecipitationCite2018 | JGR Space Physics 123(3): 1900-1914Description:Typically, ultra‐low frequency (ULF) waves have historically been invoked for radial diffusive transport leading to acceleration and loss of outer r...2019 | Geophysical Resource Letters 46(9), 4790-4798Description:The East Asian Monsoon (EAM) impacts storms, freshwater availability, wind energy production, coal consumption, and subsequent air quality for billion...Seasonal mass variations show timing and magnitude of meltwater storage in the Greenland Ice SheetCite2018 | The Cryosphere, 12, 2981–2999, 2018Description:The Greenland Ice Sheet (GrIS) is currently losing ice mass. In order to accurately predict future sea level rise, the mechanisms driving the observed...2019 | Reviews of Geophysics, 57(3), 987-1017Description:Luminescence holds unique potential as a sediment tracer and provenance method. The tracer application of luminescence has key advantages including ea...2018 | JGR Oceans 123(3): 2213-2237, 2018Description:The early autumn voyage of RV Sikuliaq to the southern Beaufort Sea in 2015 offered very favorable opportunities for observing the properties and thic...2018 | JGR Earth Surface 123(8): 1931-1957Description:Geomorphologists often rely on simple models of river channel incision for predicting rates of landscape evolution and channel response to perturbatio...2018 | JGR Atmospheres 123(1):473-490, 2018Description:While the radiative influence of clouds on Arctic sea ice is known, the influence of sea ice cover on Arctic clouds is challenging to detect, separate...2018 | The Cryosphere, 12, 3045–3065, 2018Description:Remote sensing is commonly used to monitor supraglacial lakes on the Greenland Ice Sheet (GrIS); however, most satellite records must trade off higher...2018 | JGR Biogeosciences 123(1):18-31, 2018Description:Climate and land use models predict that tropical deforestation and conversion to cropland will produce a large flux of soil carbon (C) to the atmosph...2019 | Geophysical Research Letters, 46(9), 4844-4853Description:The continuous and near‐global coverage of satellite altimeters has provided an improved understanding of sea level rise on both global and regional...
More +
You May Also Like
2019 | Geophysical Research Letters, 46, 1485-1495.
Description:
Seasonal glacier ice velocities are important for understanding controlling mechanisms of ice flow. For many Greenlandic glaciers, however, these meas...
Personal Author:
Christian, John Erich ;
Robel, Alexander A.
...
2020 | The Cryosphere, 14(7), 2515-2535
Description:
The dynamics of marine-terminating outlet glaciers are of fundamental interest in glaciology and affect mass loss from ice sheets in a warming climate...
Checkout today's featured content at repository.library.noaa.gov