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- W2080784355 abstract "CR Climate Research Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsSpecials CR 39:275-286 (2009) - DOI: https://doi.org/10.3354/cr00828 Growing-season trends in Fennoscandia 1982–2006, determined from satellite and phenology data Stein Rune Karlsen1,*, Kjell Arild Høgda1, Frans Emil Wielgolaski2, Anne Tolvanen3,4, Hans Tømmervik5, Jarmo Poikolainen3, Eero Kubin3 1Norut, Northern Research Institute Tromsø, PO Box 6434, 9294 Tromsø, Norway 2University of Oslo, Department of Biology, PO Box 1045, Blindern, 0316 Oslo, Norway 3Finnish Forest Research Institute, Muhos Research Unit, 91500 Muhos, Finland 4University of Oulu, PO Box 3000, 90014 University of Oulu, Finland 5The Norwegian Institute for Nature Research, Arctic Ecology Department, The Polar Environmental Centre, 9296 Tromsø, Norway *Email: stein-rune.karlsen@norut.no ABSTRACT: The study area of Fennoscandia is a heterogeneous climatic region. To map the linear trends in onset, end, and length of the growing season in Fennoscandia, the bimonthly Global Inventory Modeling and Mapping Studies (GIMMS) normalized difference vegetation index (NDVI) satellite data set was used. The data set has an 8 × 8 km2 spatial resolution and covers the period from 1982 to 2006. The mapping was done by applying pixel-specific threshold values to the NDVI data. These threshold values were determined from surface phenology data on birch Betula pubescens from 28 stations across the study area. During spring, most stations showed a moderately strong positive correlation between field and NDVI data. However, mapping of the end of the growing season showed less correlation with field phenology data and presented some uncertainty. On average, there was a linear trend for all of Fennoscandia of a 0.27 d yr–1 earlier onset of the growing season, a 0.37 d yr–1 later end of the growing season, and a 0.64 d yr–1 longer growing season. Within Fennoscandia, the trends showed similarities with vegetation zones and sections, which reflect the climatic gradients from north to south and from west to east in the study area. The southern and oceanic regions showed a trend of about a 1 d yr–1 longer growing season, in contrast to the alpine and northern continental regions which showed either no trend or a slightly shorter growing season. KEY WORDS: Fennoscandia · GIMMS · Growing season · NDVI · Phenology · Linear trends · Vegetation regions Full text in pdf format PreviousCite this article as: Karlsen SR, Høgda KA, Wielgolaski FE, Tolvanen A, Tømmervik H, Poikolainen J, Kubin E (2009) Growing-season trends in Fennoscandia 1982–2006, determined from satellite and phenology data. Clim Res 39:275-286. https://doi.org/10.3354/cr00828 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in CR Vol. 39, No. 3. Online publication date: September 10, 2009 Print ISSN: 0936-577X; Online ISSN: 1616-1572 Copyright © 2009 Inter-Research." @default.
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- W2080784355 title "Growing-season trends in Fennoscandia 1982–2006, determined from satellite and phenology data" @default.
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