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Andrews, Christopher; Dick, Jan; Jonasson, Christer; Callaghan, Terry V (2011): (Table 2) Temporal changes in phenological observations between 1978 and 2007, northern Sweden. PANGAEA, https://doi.org/10.1594/PANGAEA.806955, Supplement to: Andrews, C et al. (2011): Assessment of biological and environmental phenology at a landscape level from 30 years of fixed-date repeat photography in northern Sweden. AMBIO, 40(6), 600-609, https://doi.org/10.1007/s13280-011-0167-z

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Abstract:
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.
Coverage:
Latitude: 68.350000 * Longitude: 18.817000
Date/Time Start: 1978-05-22T00:00:00 * Date/Time End: 2007-10-29T00:00:00
Minimum Elevation: 341.0 m * Maximum Elevation: 1169.0 m
Event(s):
Abisko_ANSt * Latitude: 68.350000 * Longitude: 18.817000 * Date/Time Start: 1978-01-01T00:00:00 * Date/Time End: 2007-12-31T00:00:00 * Elevation Start: 341.0 m * Elevation End: 1169.0 m * Location: Abisko, Lappland, northern Sweden * Device: Photo/Video (PV)
Comment:
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
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1ObservationObsAndrews, ChristopherPhotography
2DATE/TIMEDate/TimeGeocode
3DifferenceDiffAndrews, ChristopherPhotographytemporal change in weeks
4NumberNoAndrews, Christopherp-value
5Standard errorStd e±Andrews, Christopher
Size:
45 data points

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