(Table 2) Temporal changes in phenological observations between 1978 and 2007, northern Sweden ...

• Main Authors: Andrews, Christopher, Dick, Jan, Jonasson, Christer, Callaghan, Terry V
• Format: Dataset
• Language: English
• Published: PANGAEA 2011
• Subjects: Observation; DATE/TIME; Difference; Number; Standard error; Photo/Video; Photography; International Polar Year 2007-2008 IPY; Abisko; International Polar Year; IPY; Northern Sweden
• Online Access: https://dx.doi.org/10.1594/pangaea.806955; https://doi.pangaea.de/10.1594/PANGAEA.806955

A 30-year series (1978-2007) of photographic records were analysed to determine changes in lake ice cover, local (low elevation) and montane (high elevation) snow cover and phenological stages of mountain birch (Betula pubescens ssp. czerepanovii) at the Abisko Scientific Research Station, Sweden. In most cases, the photographic-derived data showed no significant difference in phenophase score from manually observed field records from the same period, demonstrating the accuracy and potential of using weekly repeat photography as a quicker, cheaper and more adaptable tool to remotely study phenology in both biological and physical systems. Overall, increases in ambient temperatures coupled with decreases in winter ice and snow cover, and earlier occurrence of birch foliage, signal a reduction in the length of winter, a shift towards earlier springs and an increase in the length of available growing season in the Swedish sub-arctic. ... : Birch phenology from Betula pubescens ssp. czerepanovii. DATE/TIME is given in week of year. Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150 ...