A New Algorithm for Daily Sea Ice Lead Identification in the Arctic and Antarctic Winter from Thermal-Infrared Satellite Imagery.

Reiser, Fabian, Willmes, Sascha and Heinemann, Günther (2020) A New Algorithm for Daily Sea Ice Lead Identification in the Arctic and Antarctic Winter from Thermal-Infrared Satellite Imagery. Open Access Remote Sensing, 12 (12). Art.Nr. 1957. DOI 10.3390/rs12121957.

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Abstract

The presence of sea ice leads in the sea ice cover represents a key feature in polar regions by controlling the heat exchange between the relatively warm ocean and cold atmosphere due to increased fluxes of turbulent sensible and latent heat. Sea ice leads contribute to the sea ice production and are sources for the formation of dense water which affects the ocean circulation. Atmospheric and ocean models strongly rely on observational data to describe the respective state of the sea ice since numerical models are not able to produce sea ice leads explicitly. For the Arctic, some lead datasets are available, but for the Antarctic, no such data yet exist. Our study presents a new algorithm with which leads are automatically identified in satellite thermal infrared images. A variety of lead metrics is used to distinguish between true leads and detection artefacts with the use of fuzzy logic. We evaluate the outputs and provide pixel-wise uncertainties. Our data yield daily sea ice lead maps at a resolution of 1 km2 for the winter months November– April 2002/03–2018/19 (Arctic) and April–September 2003–2019 (Antarctic), respectively. The long-term average of the lead frequency distributions show distinct features related to bathymetric structures in both hemispheres

Document Type: Article
Keywords: sea ice, leads, MODIS, Arctic, Antarctic, polar regions, image processing, fuzzy logic, thermal infrared remote sensing
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.3390/rs12121957
ISSN: 2072-4292
Projects: CATS
Date Deposited: 03 Jan 2021 19:44
Last Modified: 08 Jan 2021 11:00
URI: http://oceanrep.geomar.de/id/eprint/51342

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