[{"name":"tarfala-kirchner-2025-ice-on-2024-1","title":"Time lapse imagery of the ice-on event at Darf\u00e1lj\u00e1vri (Lake Tarfala), Kebnekaise mountains, northern Sweden, autumn 2024","summary":"This dataset contains images of Darf\u00e1lj\u00e1vri taken every 2 hours (irrespective of day- or nighttime) during the period from 24 September, 2024 to 31 October, 2024. During this period, the surface of Darf\u00e1lj\u00e1vri transitions from being ice-free to ice-covered, an event referred to as \"ice-on\".\r\n\r\nThe dataset can be used to observe the ice-on event and to assign a date to it. Knowledge of lake ice phenology, i.e. seasonal formation and loss of the lacustrine ice cover, is of importance since the timing of ice-on impacts lake processes such as stratification and vertical mixing.\r\n\r\nThe pictures were acquired using a camera positioned on the mountain flank along Darf\u00e1lj\u00e1vri\u2019s north-eastern shore, at 1220 m above sea level. In total, there are 443 images. The later the season, the more pictures are dark because of the approaching of the polar night.","citations":"Kirchner N, Weckstr\u00f6m J, Jansen J, Schenk F, Barnett J, Granebeck A, Lepp\u00e4ranta M, Korhola A (2024) Water temperature, mixing, and ice phenology in the arctic\u2013alpine Lake Darf\u00e1lj\u00e1vri (Lake Tarfala), northern Sweden. Arctic, Antarctic, and Alpine Research 56. https:\/\/doi.org\/10.1080\/15230430.2023.2287704","comments":"","category":"Lacustrine","subcategory":"Lake Ice","keywords":"Darf\u00e1lj\u00e1vri; Lake Tarfala; Tarfala; Lake ice; Lake ice phenology; Ice-on","scientist":"Nina Kirchner, Johanna Dahlkvist, Jamie Barnett, Daniella Lillieroth Charalambous","firstname":"Nina","lastname":"Kirchner","address":"Tarfala Research Station and Department of Physical Geography; Stockholm University","postalcode":"SE-106 91","city":"Stockholm","province":"","country":"Sweden","parameters":"Earth science","location":"Continent > Europe > Northern Europe > Scandinavia > Sweden","progress":"","language":"English","project":"The data were collected as part of a project within the Arctic Avenue Spearhead Research project between Stockholm University and the University of Helsinki, Finland, running between 2019 and 2022. Data is collected solely by Tarfala Research Station since 2023. The support of our co-workers on the Arctic Avenue activity Lake thermal and mixing dynamics under changing climate (J. Weckstr\u00f6m, K. Weckstr\u00f6m, A. Korhola, and F. Schenk) is gratefully acknowledged.","publisher":"Bolin Centre Database","version":"1","constrains":"","access":""}]