The Canadian Ice Island Drift, Deterioration and Detection (CI2D3) Database

Crawford, Anna; Crocker, Greg; Mueller, Derek; Desjardins, Luc; Saper, R.; Carrières, Tom

doi:10.1017/jog.2018.36

Cited by 23 publications

(63 citation statements)

References 15 publications

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“…Paul et al, ). Full details regarding the data sources, workflow, and uncertainty assessment associated with the CI2D3 Database are provided in Crawford, Crocker, et al (). The database documentation (Crawford, Desjardins, et al, ) is found at https://wirl.carleton.ca/ci2d3.…”

Section: Methodsmentioning

confidence: 99%

“…Full details regarding the data sources, workflow, and uncertainty assessment associated with the CI2D3 Database are provided in Crawford, Crocker, et al (). The database documentation (Crawford, Desjardins, et al, ) is found at https://wirl.carleton.ca/ci2d3. The database is housed at the Polar Data Catalogue, a public repository (https://www.polardata.ca/pdcsearch/PDCSearch.jsp?doi_id=12678).…”

Section: Methodsmentioning

confidence: 99%

“…We quantify the spatial distribution of meltwater resulting from the drift and deterioration of the numerous ice islands that originated from the 2008, 2010, and 2012 Petermann Glacier calving events and discuss the potential consequences of this meltwater flux over varying spatial scales. The CI2D3 Database tracks the lineage of ice islands until they decrease to approximately 0.25 km 2 in surface area (Crawford, Desjardins, et al, ). It is this lineage information and thorough monitoring that made it possible to conduct these analyses for the individual PIIs observed in satellite‐borne SAR imagery that was acquired between July 2008 and December 2013.…”

Section: Introductionmentioning

confidence: 99%

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The Aftermath of Petermann Glacier Calving Events (2008–2012): Ice Island Size Distributions and Meltwater Dispersal

et al. 2018

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Three large calving events occurred at Petermann Glacier in northwest Greenland between 2008 and 2012 that generated ice islands (large tabular icebergs) that ranged from ~30 to 300 km2 in areal extent. Ice islands are known to deteriorate, via fracture and melt, during their drift through regional water bodies where they pose a potential risk to offshore resource extraction operations and disperse freshwater from the Greenland Ice Sheet. This study presents the first analysis of the deterioration occurring across the flux of ice islands that travel between Nares Strait and the North Atlantic after Petermann Glacier calving events. The evolution of Petermann ice island size distributions was evaluated, and the spatial dispersal of meltwater was quantified, through analyses that utilized the newly developed Canadian Ice Island Drift, Deterioration and Detection Database. Size‐frequency distributions remained relatively consistent, both spatially and temporally, and were well fit by power law models with slopes of approximately −1.7. This suggested that fracture was an important process by which the Petermann ice islands deteriorated, regardless of elapsed time or distance from the glacier. Ice island meltwater fluxes into the Baffin Island and Labrador currents were not large enough to slow down the Atlantic Meridional Overturning Circulation by weakening deep‐water convection in the Labrador Sea. However, augmented meltwater input was calculated within Petermann Fjord (2.0 mSv) and in the vicinity of grounding locations (0.4 mSv). Further research is necessary to better understand how this freshwater alters fjord circulation and influences the composition of local ocean waters.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Aftermath of Petermann Glacier Calving Events (2008–2012): Ice Island Size Distributions and Meltwater Dispersal

et al. 2018

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“…A 130 km 2 ice island calved from northwest Greenland's Petermann Glacier in 2012 and generated numerous ice islands, icebergs, and smaller fragments throughout its deterioration [1]. Figure 1 shows the location and field photos of the two freely drifting tabular icebergs that we surveyed.…”

Section: Field Settingmentioning

confidence: 99%

“…Recent calving events from ice shelves and floating glacier tongues have created immense tabular icebergs in both the Arctic (e.g., Petermann Glacier:~300 km 2 ) [1] and Antarctic (e.g., Larsen-C Ice Shelf: 5800 km 2 ) [2]. Mass and dimensional estimates of these 'ice islands' are used by the offshore resource extraction and shipping industries to model the risk associated with these ice hazards, as well as that imposed by the smaller ice island fragments and icebergs produced during their deterioration [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Surveying Drifting Icebergs and Ice Islands: Deterioration Detection and Mass Estimation with Aerial Photogrammetry and Laser Scanning

2018

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Icebergs and ice islands (large, tabular icebergs) are challenging targets to survey due to their size, mobility, remote locations, and potentially difficult environmental conditions. Here, we assess the precision and utility of aerial photography surveying with structure-from-motion multi-view stereo photogrammetry processing (SfM) and vessel-based terrestrial laser scanning (TLS) for iceberg deterioration detection and mass estimation. For both techniques, we determine the minimum amount of change required to reliably resolve iceberg deterioration, the deterioration detection threshold (DDT), using triplicate surveys of two iceberg survey targets. We also calculate their relative uncertainties for iceberg mass estimation. The quality of deployed Global Positioning System (GPS) units that were used for drift correction and scale assignment was a major determinant of point cloud precision. When dual-frequency GPS receivers were deployed, DDT values of 2.5 and 0.40 m were calculated for the TLS and SfM point clouds, respectively. In contrast, values of 6.6 and 3.4 m were calculated when tracking beacons with lower-quality GPS were used. The SfM dataset was also more precise when used for iceberg mass estimation, and we recommend further development of this technique for iceberg-related end-uses.

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