Alfred-Wegener-Institut) In contrast to the continent Antarctica, the Arctic region consists of a large marine basin. Therefore, Arctic ice sheets are located on its surrounding land masses. At present, the [...] Siberia-Chukchi Ice Sheet. During their maximum extent, these ice sheets reached far into the Arctic Ocean, and signs of glacial overprint can be found as far north as at the North Pole. Many studies have [...] sheet is found on Greenland, but in the past, several other ice sheets covered large areas of the Arctic realm. The most important ones were the Laurentide Ice Sheet (North America), the Svalbard-Barents

already impacting the modern ocean. To recognize changes and predict the future ocean, ocean color (OC) remote sensing aims at quantifying and monitoring optically active oceanic constituents such as phytoplankton [...] 2.2 Ocean color remote sensing 2.2 Ocean color remote sensing Ocean color (OC) remote sensing (Mobley, 1994; Mobley et al., 2021) refers to the dis- cipline that infers information on the ocean from optical [...] c CO2 was taken up by the ocean (Friedlingstein et al., 2019). As a consequence, the ocean is warming, sea levels are rising, sea ice concentrations are declining, and ocean acidity is enhancing (IPCC

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