International Journal of Biometeorology

, Volume 51, Issue 6, pp 513–524

Variability of the start of the growing season in Fennoscandia, 1982–2002

  • Stein Rune Karlsen
  • Inger Solheim
  • Pieter S. A. Beck
  • Kjell Arild Høgda
  • Frans Emil Wielgolaski
  • Hans Tømmervik
Original Paper

Abstract

Fennoscandia is characterized by a large degree of climatic diversity. Vegetation phenology may respond differently to climate change according to the climatic gradients within the region. To map the annual and spatial variability of the start of the growing season (SOS) in Fennoscandia, the twice-monthly GIMMS-NDVI satellite dataset was used. The data set has an 8 × 8 km2 spatial resolution and covers the period from 1982 to 2002. The mapping was done by applying pixel-specific threshold values to the NDVI data. These threshold values were determined form surface phenology data on birch (Betula sp.). Then, we produced NDVI based maps of SOS for each of the 21 years. Finally, the time differences between the SOS and the last day of snow cover, as well as dates of passing different temperatures, were analyzed for 21 meteorological stations. The analyses showed that 1985 was the most extreme year in terms of late SOS. In terms of early SOS, the year 1990 was by far the most extreme. Locally, the SOS has an average range of 1 month between the earliest and latest recorded SOS, with a trend towards a bigger range in the oceanic parts. The results indicate that a 1°C increase in spring temperatures in general corresponds to an advancement of 5–6 days in SOS. However, there is a clear trend according to the degree of oceanity, with a 1°C increase in the most oceanic parts corresponding roughly to 7–9 days earlier SOS, compared to less than 5 days earlier in the continental parts.

Keywords

Fennoscandia Phenology Start of the growing season NDVI Air temperature 

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Copyright information

© ISB 2007

Authors and Affiliations

  • Stein Rune Karlsen
    • 1
  • Inger Solheim
    • 2
  • Pieter S. A. Beck
    • 1
    • 3
  • Kjell Arild Høgda
    • 1
  • Frans Emil Wielgolaski
    • 4
  • Hans Tømmervik
    • 5
  1. 1.NORUT Information Technology Ltd.TromsøNorway
  2. 2.Faculty of Mathematical SciencesUniversity of TromsøTromsøNorway
  3. 3.Department of BiologyUniversity of TromsøTromsøNorway
  4. 4.Department of BiologyUniversity of OsloOsloNorway
  5. 5.Department of Arctic EcologyThe Norwegian Institute for Nature Research, The Polar Environmental CentreTromsøNorway

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