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Detailed Lacustrine Calving Iceberg Inventory from Very High Resolution Optical Imagery and Object-Based Image Analysis. REMOTE SENSING 2020. [DOI: 10.3390/rs12111807] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
In the field of iceberg and glacier calving studies, it is important to collect comprehensive datasets of populations of icebergs. Particularly, calving of lake-terminating glaciers has been understudied. The aim of this work is to present an object-based method of iceberg detection and to create an inventory of icebergs located in a proglacial lagoon of San Quintín glacier, Northern Patagonia Icefield, Chile. This dataset is created using high-resolution WorldView-2 imagery and a derived DEM. We use it to briefly discuss the iceberg size distribution and area–volume scaling. Segmentation of the multispectral imagery produced a map of objects, which were classified with use of Random Forest supervised classification algorithm. An intermediate classification product was corrected with a ruleset exploiting contextual information and a watershed algorithm that was used to divide multiple touching icebergs into separate objects. Common theoretical heavy-tail statistical distributions were tested as descriptors of iceberg area and volume distributions. Power law models were proposed for the area–volume relationship. The proposed method performed well over the open lake detecting correctly icebergs in all size bands except 5–15 m2 where many icebergs were missed. A section of the lagoon with ice melange was not reliably mapped due to uniformity of the area in the imagery and DEM. The precision of the DEM limited the scaling effort to icebergs taller than 1.7 m and larger than 99 m2, despite the inventory containing icebergs as small as 4 m2. The work demonstrates viability of object-based analysis for lacustrine iceberg detection and shows that the statistical properties of iceberg population at San Quintín glacier match those of populations produced by tidewater glaciers.
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2
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Womble JN, Ver Hoef JM, Gende SM, Mathews EA. Calibrating and adjusting counts of harbor seals in a tidewater glacier fjord to estimate abundance and trends 1992 to 2017. Ecosphere 2020. [DOI: 10.1002/ecs2.3111] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Affiliation(s)
- Jamie N. Womble
- National Park Service Glacier Bay Field Station, 3100 National Park Road Juneau Alaska99801USA
| | - Jay M. Ver Hoef
- Marine Mammal Laboratory NOAA FisheriesAlaska Fisheries Science Center 7600 Sand Point Way NE Seattle Washington98115USA
| | - Scott M. Gende
- National Park Service Glacier Bay Field Station, 3100 National Park Road Juneau Alaska99801USA
| | - Elizabeth A. Mathews
- Natural Sciences Department University of Alaska Southeast 11066 Auke Lake Way Juneau Alaska99801USA
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3
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Latest Geodetic Changes of Austre Lovénbreen and Pedersenbreen, Svalbard. REMOTE SENSING 2019. [DOI: 10.3390/rs11242890] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Geodetic mass changes in the Svalbard glaciers Austre Lovénbreen and Pedersenbreen were studied via high-precision real-time kinematic (RTK)-global positioning system (GPS) measurements from 2013 to 2015. To evaluate the elevation changes of the two Svalbard glaciers, more than 10,000 GPS records for each glacier surface were collected every year from 2013 to 2015. The results of several widely used interpolation methods (i.e., inverse distance weighting (IDW), ordinary kriging (OK), universal kriging (UK), natural neighbor (NN), spline interpolation, and Topo to Raster (TTR) interpolation) were compared. Considering the smoothness and accuracy of the glacier surface, NN interpolation was selected as the most suitable interpolation method to generate a surface digital elevation model (DEM). In addition, we compared two procedures for calculating elevation changes: using DEMs generated from the direct interpolation of the RTK-GPS points and using the elevation bias of crossover points from the RTK-GPS tracks in different years. Then, the geodetic mass balances were calculated by converting the elevation changes to their water equivalents. Comparing the geodetic mass balances calculated with and without considering snow depth revealed that ignoring the effect of snow depth, which differs greatly over a short time interval, might lead to bias in mass balance investigation. In summary, there was a positive correlation between the geodetic mass balance and the corresponding elevation. The mass loss increased with decreasing elevation, and the mean annual gradients of the geodetic mass balance along the elevation of Austre Lovénbreen and Pedersenbreen in 2013–2015 were approximately 2.60‰ and 2.35‰, respectively. The gradients at the glacier snouts were three times larger than those over the whole glaciers. Additionally, some mass gain occurred in certain high-elevation regions. Compared with a 2019 DEM generated from unmanned aerial vehicle measurement, the glacier snout areas presented an accelerating thinning situation in 2015–2019.
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Pastick NJ, Jorgenson MT, Goetz SJ, Jones BM, Wylie BK, Minsley BJ, Genet H, Knight JF, Swanson DK, Jorgenson JC. Spatiotemporal remote sensing of ecosystem change and causation across Alaska. GLOBAL CHANGE BIOLOGY 2019; 25:1171-1189. [PMID: 29808518 DOI: 10.1111/gcb.14279] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2018] [Revised: 01/25/2018] [Accepted: 03/09/2018] [Indexed: 05/19/2023]
Abstract
Contemporary climate change in Alaska has resulted in amplified rates of press and pulse disturbances that drive ecosystem change with significant consequences for socio-environmental systems. Despite the vulnerability of Arctic and boreal landscapes to change, little has been done to characterize landscape change and associated drivers across northern high-latitude ecosystems. Here we characterize the historical sensitivity of Alaska's ecosystems to environmental change and anthropogenic disturbances using expert knowledge, remote sensing data, and spatiotemporal analyses and modeling. Time-series analysis of moderate-and high-resolution imagery was used to characterize land- and water-surface dynamics across Alaska. Some 430,000 interpretations of ecological and geomorphological change were made using historical air photos and satellite imagery, and corroborate land-surface greening, browning, and wetness/moisture trend parameters derived from peak-growing season Landsat imagery acquired from 1984 to 2015. The time series of change metrics, together with climatic data and maps of landscape characteristics, were incorporated into a modeling framework for mapping and understanding of drivers of change throughout Alaska. According to our analysis, approximately 13% (~174,000 ± 8700 km2 ) of Alaska has experienced directional change in the last 32 years (±95% confidence intervals). At the ecoregions level, substantial increases in remotely sensed vegetation productivity were most pronounced in western and northern foothills of Alaska, which is explained by vegetation growth associated with increasing air temperatures. Significant browning trends were largely the result of recent wildfires in interior Alaska, but browning trends are also driven by increases in evaporative demand and surface-water gains that have predominately occurred over warming permafrost landscapes. Increased rates of photosynthetic activity are associated with stabilization and recovery processes following wildfire, timber harvesting, insect damage, thermokarst, glacial retreat, and lake infilling and drainage events. Our results fill a critical gap in the understanding of historical and potential future trajectories of change in northern high-latitude regions.
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Affiliation(s)
- Neal J Pastick
- Stinger Ghaffarian Technologies, Inc. (contractor to the U.S. Geological Survey), Sioux Falls, South Dakota
- Department of Forest Resources, University of Minnesota, St. Paul, Minnesota
| | | | - Scott J Goetz
- School of Informatics, Computing, and Cyber Systems, Northern Arizona University, Flagstaff, Arizona
| | - Benjamin M Jones
- Alaska Science Center, U.S. Geological Survey, Anchorage, Alaska
| | - Bruce K Wylie
- Earth Resources Observation and Science Center, U.S. Geological Survey, Sioux Falls, South Dakota
| | - Burke J Minsley
- Crustal Geophysics and Geochemistry Science Center, U.S. Geological Survey, Denver, Colorado
| | - Hélène Genet
- Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, Alaska
| | - Joseph F Knight
- Department of Forest Resources, University of Minnesota, St. Paul, Minnesota
| | | | - Janet C Jorgenson
- Arctic National Wildlife Refuge, U.S. Fish and Wildlife Service, Fairbanks, Alaska
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5
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Glacier Changes in the Susitna Basin, Alaska, USA, (1951–2015) using GIS and Remote Sensing Methods. REMOTE SENSING 2017. [DOI: 10.3390/rs9050478] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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6
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Marzeion B, Champollion N, Haeberli W, Langley K, Leclercq P, Paul F. Observation-Based Estimates of Global Glacier Mass Change and Its Contribution to Sea-Level Change. SURVEYS IN GEOPHYSICS 2017; 38:105-130. [PMID: 28203035 PMCID: PMC5283499 DOI: 10.1007/s10712-016-9394-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2016] [Accepted: 10/21/2016] [Indexed: 05/11/2023]
Abstract
Glaciers have strongly contributed to sea-level rise during the past century and will continue to be an important part of the sea-level budget during the twenty-first century. Here, we review the progress in estimating global glacier mass change from in situ measurements of mass and length changes, remote sensing methods, and mass balance modeling driven by climate observations. For the period before the onset of satellite observations, different strategies to overcome the uncertainty associated with monitoring only a small sample of the world's glaciers have been developed. These methods now yield estimates generally reconcilable with each other within their respective uncertainty margins. Whereas this is also the case for the recent decades, the greatly increased number of estimates obtained from remote sensing reveals that gravimetry-based methods typically arrive at lower mass loss estimates than the other methods. We suggest that strategies for better interconnecting the different methods are needed to ensure progress and to increase the temporal and spatial detail of reliable glacier mass change estimates.
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Affiliation(s)
- B. Marzeion
- Institute of Geography, University of Bremen, Postfach 330 440, 28334 Bremen, Germany
| | - N. Champollion
- International Space Science Institute, Hallerstrasse 6, 3012 Bern, Switzerland
| | - W. Haeberli
- Department of Geography, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
| | - K. Langley
- Asiaq Greenland Survey, Qatserisut 8, 3900 Nuuk, Greenland
| | - P. Leclercq
- Department of Geosciences, University of Oslo, P.O. Box 1047, Blindern, 0316 Oslo, Norway
| | - F. Paul
- Department of Geography, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
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McNabb RW, Womble JN, Prakash A, Gens R, Haselwimmer CE. Quantification and Analysis of Icebergs in a Tidewater Glacier Fjord Using an Object-Based Approach. PLoS One 2016; 11:e0164444. [PMID: 27828967 PMCID: PMC5102356 DOI: 10.1371/journal.pone.0164444] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2015] [Accepted: 09/26/2016] [Indexed: 12/04/2022] Open
Abstract
Tidewater glaciers are glaciers that terminate in, and calve icebergs into, the ocean. In addition to the influence that tidewater glaciers have on physical and chemical oceanography, floating icebergs serve as habitat for marine animals such as harbor seals (Phoca vitulina richardii). The availability and spatial distribution of glacier ice in the fjords is likely a key environmental variable that influences the abundance and distribution of selected marine mammals; however, the amount of ice and the fine-scale characteristics of ice in fjords have not been systematically quantified. Given the predicted changes in glacier habitat, there is a need for the development of methods that could be broadly applied to quantify changes in available ice habitat in tidewater glacier fjords. We present a case study to describe a novel method that uses object-based image analysis (OBIA) to classify floating glacier ice in a tidewater glacier fjord from high-resolution aerial digital imagery. Our objectives were to (i) develop workflows and rule sets to classify high spatial resolution airborne imagery of floating glacier ice; (ii) quantify the amount and fine-scale characteristics of floating glacier ice; (iii) and develop processes for automating the object-based analysis of floating glacier ice for large number of images from a representative survey day during June 2007 in Johns Hopkins Inlet (JHI), a tidewater glacier fjord in Glacier Bay National Park, southeastern Alaska. On 18 June 2007, JHI was comprised of brash ice ( x¯ = 45.2%, SD = 41.5%), water ( x¯ = 52.7%, SD = 42.3%), and icebergs ( x¯ = 2.1%, SD = 1.4%). Average iceberg size per scene was 5.7 m2 (SD = 2.6 m2). We estimate the total area (± uncertainty) of iceberg habitat in the fjord to be 455,400 ± 123,000 m2. The method works well for classifying icebergs across scenes (classification accuracy of 75.6%); the largest classification errors occur in areas with densely-packed ice, low contrast between neighboring ice cover, or dark or sediment-covered ice, where icebergs may be misclassified as brash ice about 20% of the time. OBIA is a powerful image classification tool, and the method we present could be adapted and applied to other ice habitats, such as sea ice, to assess changes in ice characteristics and availability.
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Affiliation(s)
- Robert W. McNabb
- Geophysical Institute, University of Alaska Fairbanks, Fairbanks, Alaska, United States of America
| | - Jamie N. Womble
- Glacier Bay Field Station, National Park Service, Juneau, Alaska, United States of America
- * E-mail:
| | - Anupma Prakash
- Geophysical Institute, University of Alaska Fairbanks, Fairbanks, Alaska, United States of America
| | - Rudiger Gens
- Geophysical Institute, University of Alaska Fairbanks, Fairbanks, Alaska, United States of America
| | - Christian E. Haselwimmer
- Geophysical Institute, University of Alaska Fairbanks, Fairbanks, Alaska, United States of America
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8
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Fellman JB, Hood E, Raymond PA, Stubbins A, Spencer RGM. Spatial Variation in the Origin of Dissolved Organic Carbon in Snow on the Juneau Icefield, Southeast Alaska. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2015; 49:11492-11499. [PMID: 26348607 DOI: 10.1021/acs.est.5b02685] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Dissolved organic carbon (DOC) plays a fundamental role in the biogeochemistry of glacier ecosystems. However, the specific sources of glacier DOC remain unresolved. To assess the origin and nature of glacier DOC, we collected snow from 10 locations along a transect across the Juneau Icefield, Alaska extending from the coast toward the interior. The Δ(14)C-DOC of snow varied from -743 to -420‰ showing progressive depletion across the Icefield as δ(18)O of water became more depleted (R(2) = 0.56). Older DOC corresponded to lower DOC concentrations in snow (R(2) = 0.31) and a decrease in percent humic-like fluorescence (R(2) = 0.36), indicating an overall decrease in modern DOC across the Icefield. Carbon isotopic signatures ((13)C and (14)C) combined with a three-source mixing model showed that DOC deposited in snow across the Icefield reflects fossil fuel combustion products (43-73%) and to a lesser extent marine (21-41%) and terrestrial sources (1-26%). Our finding that combustion aerosols are a large source of DOC to the glacier ecosystem during the early spring (April-May) together with the pronounced rates of glacier melting in the region suggests that the delivery of relic DOC to the ocean may be increasing and consequently impacting the biogeochemistry of glacial and proglacial ecosystems in unanticipated ways.
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Affiliation(s)
- Jason B Fellman
- Environmental Science Program, University of Alaska Southeast , Juneau, Alaska 99801, United States
| | - Eran Hood
- Environmental Science Program, University of Alaska Southeast , Juneau, Alaska 99801, United States
| | - Peter A Raymond
- School of Forestry and Environmental Sciences, Yale University , New Haven, Connecticut 06511, United States
| | - Aron Stubbins
- Skidaway Institute of Oceanography, Department of Marine Sciences, University of Georgia , Savannah, Georgia 31411, United States
| | - Robert G M Spencer
- Department of Earth, Ocean and Atmospheric Science, Florida State University , Tallahassee, Florida 32306, United States
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Fellman JB, Hood E, Dryer W, Pyare S. Stream Physical Characteristics Impact Habitat Quality for Pacific Salmon in Two Temperate Coastal Watersheds. PLoS One 2015. [PMID: 26222506 PMCID: PMC4519098 DOI: 10.1371/journal.pone.0132652] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Climate warming is likely to cause both indirect and direct impacts on the biophysical properties of stream ecosystems especially in regions that support societally important fish species such as Pacific salmon. We studied the seasonal variability and interaction between stream temperature and DO in a low-gradient, forested stream and a glacial-fed stream in coastal southeast Alaska to assess how these key physical parameters impact freshwater habitat quality for salmon. We also use multiple regression analysis to evaluate how discharge and air temperature influence the seasonal patterns in stream temperature and DO. Mean daily stream temperature ranged from 1.1 to 16.4°C in non-glacial Peterson Creek but only 1.0 to 8.8°C in glacial-fed Cowee Creek, reflecting the strong moderating influence glacier meltwater had on stream temperature. Peterson Creek had mean daily DO concentrations ranging from 3.8 to 14.1 mg L−1 suggesting future climate changes could result in an even greater depletion in DO. Mean daily stream temperature strongly controlled mean daily DO in both Peterson (R2=0.82, P<0.01) and Cowee Creek (R2=0.93, P<0.01). However, DO in Peterson Creek was mildly related to stream temperature (R2=0.15, P<0.01) and strongly influenced by discharge (R2=0.46, P<0.01) on days when stream temperature exceeded 10°C. Moreover, Peterson Creek had DO values that were particularly low (<5.0 mg L−1) on days when discharge was low but also when spawning salmon were abundant. Our results demonstrate the complexity of stream temperature and DO regimes in coastal temperate watersheds and highlight the need for watershed managers to move towards multi-factor risk assessment of potential habitat quality for salmon rather than single factor assessments alone.
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Affiliation(s)
- Jason B. Fellman
- Environmental Science and Geography Program, University of Alaska Southeast, Juneau, Alaska, United States of America
- * E-mail:
| | - Eran Hood
- Environmental Science and Geography Program, University of Alaska Southeast, Juneau, Alaska, United States of America
| | - William Dryer
- Environmental Science and Geography Program, University of Alaska Southeast, Juneau, Alaska, United States of America
| | - Sanjay Pyare
- Environmental Science and Geography Program, University of Alaska Southeast, Juneau, Alaska, United States of America
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Abstract
Glacial retreat creates new habitat which is colonized and developed by plants and animals during the process of primary succession. While there has been much debate about the relative role of deterministic and stochastic processes during terrestrial succession, evidence from freshwater ecosystems remains minimal and a general consensus is lacking. Using a unique 27 years record of community assembly following glacial recession in southeast Alaska, we demonstrate significant change in the trait composition of stream invertebrate communities as catchment glacial cover decreased from ∼70% to zero. Functional diversity increased significantly as glacier cover decreased and taxonomic richness increased. Null modelling approaches led to a key finding that niche filtering processes were dominant when glacial cover was extensive, reflecting water temperature and dispersal constraints. Thereafter the community shifted towards co-occurrence of stochastic and deterministic assembly processes. A further novel discovery was that intrinsic functional redundancy developed throughout the study, particularly because new colonizers possessed similar traits to taxa already present. Rapid glacial retreat is occurring in Arctic and alpine environments worldwide and the assembly processes observed in this study provide new fundamental insights into how glacially influenced stream ecosystems will respond. The findings support tolerance as a key primary successional mechanism in this system, and have broader value for developing our understanding of how biological communities in river ecosystems assemble or restructure in response to environmental change.
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11
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Goff JA, Lawson DE, Willems BA, Davis M, Gulick SPS. Morainal bank progradation and sediment accumulation in Disenchantment Bay, Alaska: Response to advancing Hubbard Glacier. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/2011jf002312] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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12
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Sato T, Miura S, Sun W, Sugano T, Freymueller JT, Larsen CF, Ohta Y, Fujimoto H, Inazu D, Motyka RJ. Gravity and uplift rates observed in southeast Alaska and their comparison with GIA model predictions. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/2011jb008485] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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13
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Hood E, Fellman J, Spencer RGM, Hernes PJ, Edwards R, D'Amore D, Scott D. Glaciers as a source of ancient and labile organic matter to the marine environment. Nature 2010; 462:1044-7. [PMID: 20033045 DOI: 10.1038/nature08580] [Citation(s) in RCA: 139] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2009] [Accepted: 10/02/2009] [Indexed: 11/09/2022]
Abstract
Riverine organic matter supports of the order of one-fifth of estuarine metabolism. Coastal ecosystems are therefore sensitive to alteration of both the quantity and lability of terrigenous dissolved organic matter (DOM) delivered by rivers. The lability of DOM is thought to vary with age, with younger, relatively unaltered organic matter being more easily metabolized by aquatic heterotrophs than older, heavily modified material. This view is developed exclusively from work in watersheds where terrestrial plant and soil sources dominate streamwater DOM. Here we characterize streamwater DOM from 11 coastal watersheds on the Gulf of Alaska that vary widely in glacier coverage (0-64 per cent). In contrast to non-glacial rivers, we find that the bioavailability of DOM to marine microorganisms is significantly correlated with increasing (14)C age. Moreover, the most heavily glaciated watersheds are the source of the oldest ( approximately 4 kyr (14)C age) and most labile (66 per cent bioavailable) DOM. These glacial watersheds have extreme runoff rates, in part because they are subject to some of the highest rates of glacier volume loss on Earth. We estimate the cumulative flux of dissolved organic carbon derived from glaciers contributing runoff to the Gulf of Alaska at 0.13 +/- 0.01 Tg yr(-1) (1 Tg = 10(12) g), of which approximately 0.10 Tg is highly labile. This indicates that glacial runoff is a quantitatively important source of labile reduced carbon to marine ecosystems. Moreover, because glaciers and ice sheets represent the second largest reservoir of water in the global hydrologic system, our findings indicate that climatically driven changes in glacier volume could alter the age, quantity and reactivity of DOM entering coastal oceans.
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Affiliation(s)
- Eran Hood
- Environmental Science and Geography Program, University of Alaska Southeast, Juneau, Alaska 99801, USA.
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14
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Hood E, Berner L. Effects of changing glacial coverage on the physical and biogeochemical properties of coastal streams in southeastern Alaska. ACTA ACUST UNITED AC 2009. [DOI: 10.1029/2009jg000971] [Citation(s) in RCA: 93] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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15
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Arendt A, Echelmeyer K, Harrison W, Lingle C, Zirnheld S, Valentine V, Ritchie B, Druckenmiller M. Updated estimates of glacier volume changes in the western Chugach Mountains, Alaska, and a comparison of regional extrapolation methods. ACTA ACUST UNITED AC 2006. [DOI: 10.1029/2005jf000436] [Citation(s) in RCA: 88] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- A. Arendt
- Geophysical Institute; University of Alaska Fairbanks; Fairbanks Alaska USA
| | - K. Echelmeyer
- Geophysical Institute; University of Alaska Fairbanks; Fairbanks Alaska USA
| | - W. Harrison
- Geophysical Institute; University of Alaska Fairbanks; Fairbanks Alaska USA
| | - C. Lingle
- Geophysical Institute; University of Alaska Fairbanks; Fairbanks Alaska USA
| | - S. Zirnheld
- Geophysical Institute; University of Alaska Fairbanks; Fairbanks Alaska USA
| | - V. Valentine
- Geophysical Institute; University of Alaska Fairbanks; Fairbanks Alaska USA
| | - B. Ritchie
- Geophysical Institute; University of Alaska Fairbanks; Fairbanks Alaska USA
| | - M. Druckenmiller
- Geophysical Institute; University of Alaska Fairbanks; Fairbanks Alaska USA
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