English
norskBlar i forfatter "Matero, Ilkka"
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Monitoring a changing Arctic: Recent advancements in the study of sea ice microbial communities
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-11-25)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 CO<sub>2</sub> ... -
Monitoring a changing Arctic: Recent advancements in the study of sea ice microbial communities
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-11-25)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 ... -
Net heterotrophy in High Arctic first-year and multi-year spring sea ice
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-01-04)The net productivity of sea ice is determined by the physical and geochemical characteristics of the ice–ocean system and the activity of organisms inhabiting the ice. Differences in habitat suitability between first-year and multi-year sea ice can affect the ice algal community composition and acclimation state, introducing considerable variability to primary production within each ice type. In ... -
Platelet ice under Arctic pack ice in winter
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-08-17)The formation of platelet ice is well known to occur under Antarctic sea ice, where subice platelet layers form from supercooled ice shelf water. In the Arctic, however, platelet ice formation has not been extensively observed, and its formation and morphology currently remain enigmatic. Here, we present the first comprehensive, long‐term in situ observations of a decimeter thick subice platelet ... -
Surface-based Ku-and Ka-band polarimetric radar for sea ice studies
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-12-04)To improve our understanding of how snow properties influence sea ice thickness retrievals from presently operational and upcoming satellite radar altimeter missions, as well as to investigate the potential for combining dual frequencies to simultaneously map snow depth and sea ice thickness, a new, surface-based, fully polarimetric Ku- and Ka-band radar (KuKa radar) was built and deployed ... -
Temporal evolution of under-ice meltwater layers and false bottoms and their impact on summer Arctic sea ice mass balance
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-31)Low-salinity meltwater from Arctic sea ice and its snow cover accumulates and creates under-ice meltwater layers below sea ice.These meltwater layers can result in the formation of new ice layers, or false bottoms, at the interface of this low-salinity meltwater and colder seawater. As part of the Multidisciplinary drifting Observatory for the Study of the Arctic Climate (MOSAiC), we used a ... -
Wind redistribution of snow impacts the Ka- and Ku-band radar signatures of Arctic sea ice
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-06-02)Wind-driven redistribution of snow on sea ice alters its topography and microstructure, yet the impact of these processes on radar signatures is poorly understood. Here, we examine the effects of snow redistribution over Arctic sea ice on radar waveforms and backscatter signatures obtained from a surface-based, fully polarimetric Ka- and Ku-band radar at incidence angles between 0∘ (nadir) and 50∘. ...
