Landfast ice properties over the Beaufort Sea region in 2000–2019 from MODIS and Canadian Ice Service data

Two decades (2000–2019) of the landfast ice properties in the Beaufort Sea region in the Canadian Arctic were analyzed at 250 m spatial resolution from two sources: (1) monthly maps derived at the Canada Centre for Remote Sensing from the Moderate Resolution Imaging Spectroradiometer clear-sky satel...

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Bibliographic Details
Published in:Canadian Journal of Earth Sciences
Main Authors: Trishchenko, Alexander P., Kostylev, Vladimir E., Luo, Yi, Ungureanu, Calin, Whalen, Dustin, Li, Junhua
Format: Article in Journal/Newspaper
Language:English
Published: Canadian Science Publishing 2022
Subjects:
General Earth and Planetary Sciences
Arctic
Canada
Herschel Island
Cape Bathurst
Mackenzie Bay
Barter Island
Beaufort Sea
Richards Island
Alaska
Online Access:http://dx.doi.org/10.1139/cjes-2021-0011
https://cdnsciencepub.com/doi/full-xml/10.1139/cjes-2021-0011
https://cdnsciencepub.com/doi/pdf/10.1139/cjes-2021-0011
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Summary:Two decades (2000–2019) of the landfast ice properties in the Beaufort Sea region in the Canadian Arctic were analyzed at 250 m spatial resolution from two sources: (1) monthly maps derived at the Canada Centre for Remote Sensing from the Moderate Resolution Imaging Spectroradiometer clear-sky satellite image composites; and (2) Canadian Ice Service charts. Detailed comparisons have been conducted for the landfast ice spatial extent, the water depth at, and the distance to the outer seaward edge from the coast in four sub-regions: (1) Alaska coast; (2) Barter Island to Herschel Island; (3) Mackenzie Bay; and (4) Richards Island to Cape Bathurst. The results from both sources demonstrate good agreement. The average spatial extent for the entire region over the April–June period is 48.5 (±5.0) × 10 3 km 2 from Canadian Ice Service data versus 45.1 (±6.1) × 10 3 km 2 from satellite data used in this study (7.0% difference). The correlation coefficient for April–June is 0.73 (p = 2.91 × 10 −4 ). The long-term linear trends of the April–June spatial extent since 2000 demonstrated statistically significant decline: −4.45 (±1.69) × 10 3 km 2 /decade and −4.73 (±2.17) × 10 3 km 2 /decade from Canadian Ice Service and satellite data, respectively. The landfast ice in the Beaufort Sea region showed the general tendency for an earlier break-up, later onset, and longer ice-free period. The break-up date has decreased by 7.6 days/decade in the Mackenzie Bay region. The western part of the study area did not demonstrate statistically significant changes since 2000.

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