http://bolin.su.se/data/tarfala-kirchner-2023-ice-on-2020-1 Nina Kirchner, Annika Granebeck, Daniella Lillieroth Charalambous Bolin Centre Database 2023 Datafile Lacustrine Observations Lake Tarfala Tarfala Lake ice Lake ice phenology Ice-on Earth science > Cryosphere > Snow/ice > Lake ice Nina Kirchner 2023-05-09T14:12:44+00:00 English 1 The dataset consists of image files (`JPG`) of Lake Tarfala, with the date and time (Swedish daylight saving time, UTC+2 until 25 October and thereafter Swedish standard time, UTC+1) included in each photo. The pictures were acquired using a camera positioned on the mountain flank along Lake Tarfala’s north-eastern shore, at ~67.9° N, 18.6° E, at 1220 m above sea level. The data were collected using a SiFar Willfine Trail Camera 4.0CG. The camera elevation is 1.8 m above ground. Each JPG file has a size of ~1 MB. The total size of the dataset is ~235 MB. During a few short periods, fog, snow and/or rain obscures the view of the lake. Due to shorter periods of daylight during autumn, the number of dark images between dusk and dawn successively increased. These are therefore excluded from the dataset. The support of our co-workers on the Arctic Avenue activity *Lake thermal and mixing dynamics under changing climate* (J. Weckström, K. Weckström, A. Korhola, and F. Schenk) is gratefully acknowledged.