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8. Snow Depth Estimation on Lead-less Landfast ice using Cryo2Ice satellite observations.

Author

Saha, Monojit, Stroeve, Julienne, Isleifson, Dustin, Yackel, John, Nandan, Vishnu, Landy, Jack Christopher, and Lam, Hoi Ming

Subjects
SNOW accumulation, SEA ice, SURFACE roughness
Abstract

Observations of snow on Arctic sea ice are vitally important for sea ice thickness estimation as well as for understanding bio-physical processes and human-activities. This study is the first assessment of the potential for near-coincident ICESat-2 and Cryosat-2 (Cryo2Ice) snow depth retrievals in a lead-less region of the Canadian Arctic Archipelago. Snow depths are retrieved using the absolute difference in surface height from a near-coincident ICESat-2 and Cryosat-2 after applying an ocean tide correction between satellite passes 77 minutes apart. Both the absolute mean snow depths and snow depth distributions retrieved from Cryo2Ice compare favourably to in-situ measurements. All four in-situ sites had snow with saline basal layers and different levels of roughness/ridging. The retrieved Cryo2Ice snow depths were underestimated by an average of 20.7 % which is slightly higher than the tidal adjustment applied. Differences in the Cryo2Ice and in-situ snow depth distributions reflected the different sampling resolutions between the sensors and the in-situ measurements, with more heavily ridged areas producing larger mean underestimation of the snow depth. Results suggest the possibility of estimating snow depth over lead-less landfast sea ice but attributing 2–3 cm biases to differences in sampling resolution, snow salinity, density, surface roughness and/or errors in altimeter's tidal corrections require further investigation. [ABSTRACT FROM AUTHOR]

Published
2023
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12. Monitoring a changing Arctic: Recent advancements in the study of sea ice microbial communities

Author

Campbell, Karley, primary, Matero, Ilkka, additional, Bellas, Christopher, additional, Turpin-Jelfs, Thomas, additional, Anhaus, Philipp, additional, Graeve, Martin, additional, Fripiat, Francois, additional, Tranter, Martyn, additional, Landy, Jack Christopher, additional, Sanchez-Baracaldo, Patricia, additional, Leu, Eva, additional, Katlein, Christian, additional, Mundy, C. J, additional, Rysgaard, Søren, additional, Tedesco, Letizia, additional, Haas, Christian, additional, and Nicolaus, Marcel, additional

Published
2021
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13. Monitoring a changing Arctic: Recent advancements in the study of sea ice microbial communities

Author

Campbell, Karley, Matero, Ilkka, Bellas, Christopher, Turpin-Jelfs, Thomas, Anhaus, Philipp, Graeve, Martin, Fripiat, Francois, Tranter, Martyn, Landy, Jack Christopher, Sanchez-Baracaldo, Patricia, Leu, Eva, Katlein, Christian, Mundy, C. J, Rysgaard, Søren, Tedesco, Letizia, Haas, Christian, Nicolaus, Marcel, Campbell, Karley, Matero, Ilkka, Bellas, Christopher, Turpin-Jelfs, Thomas, Anhaus, Philipp, Graeve, Martin, Fripiat, Francois, Tranter, Martyn, Landy, Jack Christopher, Sanchez-Baracaldo, Patricia, Leu, Eva, Katlein, Christian, Mundy, C. J, Rysgaard, Søren, Tedesco, Letizia, Haas, Christian, and Nicolaus, Marcel

Abstract

Sea ice continues to decline across many regions of the Arctic, with remaining ice becoming increasingly younger and more dynamic. These changes alter the habitats of microbial life that live within the sea ice, which support healthy functioning of the marine ecosystem and provision of resources for human-consumption, in addition to influencing biogeochemical cycles (e.g. air–sea CO2 exchange). With the susceptibility of sea ice ecosystems to climate change, there is a pressing need to fill knowledge gaps surrounding sea ice habitats and their microbial communities. Of fundamental importance to this goal is the development of new methodologies that permit effective study of them. Based on outcomes from the DiatomARCTIC project, this paper integrates existing knowledge with case studies to provide insight on how to best document sea ice microbial communities, which contributes to the sustainable use and protection of Arctic marine and coastal ecosystems in a time of environmental change.

Published
2021

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