Time-seies analysis of albedo on Svalbard (Part 2)

Further analysis involved calculating yearly averages as well as the spatial representation of albedo change across Austfonna.


Key points from these figures are as follows:

  • Yearly averages (αyearly) disclose no overall trend, but this masks an almost sinusoidal pattern whereby early and late trends cancel one another. Initial multi-year decline of 0.018 ± 0.0034 year􀀀-1is halted in 2005. Increases are then seen until 2008, whereby another significant forcing reversed the trend once again,into a decreasing trend at 0.0194 ± 0.0029 year􀀀-1.
  • Average monthly albedos also show a slight change in pattern from the eastern Arctic glacier’s with July not providing the greatest proportion of albedo decline and June the only month showing any real decline (0.0063 ± 0.0016 year􀀀-1).
  • Regionally 86% of the glacier has seen a decline in albedo.
  • In contrast to Humboldt Glacier, αdaily exhibits greater short term variability throughout June, July and August. Defining an extreme variance shift as a five unit swing over a period of 3 days, the current declining period (2008 – 2013) has 41 shifts, compared to 16 on Humboldt Glacier