TY - JOUR A1 - Reiser, Fabian A1 - Willmes, Sascha A1 - Heinemann, Günther T1 - A new algorithm for daily sea ice lead identification in the Arctic and Antarctic winter from thermal-infrared satellite imagery T2 - Remote Sensing N2 - 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. KW - sea ice KW - leads KW - MODIS KW - Arctic KW - thermal infrared remote sensing KW - Polargebiete KW - Meereis KW - Satellitenfernerkundung KW - Infrarotthermographie KW - Bildverarbeitung Y1 - 2020 UR - https://ubt.opus.hbz-nrw.de/frontdoor/index/index/docId/1655 UR - https://nbn-resolving.org/urn:nbn:de:hbz:385-1-16556 IS - 12/12 SP - 1 EP - 16 PB - MDPI CY - Basel ER -