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dc.contributor.authorKarlsen, Stein Rune
dc.contributor.authorStendardi, Laura
dc.contributor.authorTømmervik, Hans
dc.contributor.authorNilsen, Lennart
dc.contributor.authorArntzen, Ingar
dc.contributor.authorCooper, Elisabeth J.
dc.date.accessioned2021-10-26T07:26:49Z
dc.date.available2021-10-26T07:26:49Z
dc.date.issued2021-08-02
dc.description.abstractThe Arctic is a region that is expected to experience a high increase in temperature. Changes in the timing of phenological phases, such as the onset of growth (as observed by remote sensing), is a sensitive bio-indicator of climate change. In this paper, the study area was the central part of Spitsbergen, Svalbard, located between 77.28°N and 78.44°N. The goals of this study were: (1) to prepare, analyze and present a cloud-free time-series of daily Sentinel-2 NDVI datasets for the 2016 to 2019 seasons, and (2) to demonstrate the use of the dataset in mapping the onset of growth. Due to a short and intense period with greening-up and frequent cloud cover, all the cloud-free Sentinel-2 data were used. The onset of growth was then mapped by a NDVI threshold method, which showed significant correlation (r<sup>2</sup> = 0.47, <i>n</i> = 38, <i>p</i> < 0.0001) with ground-based phenocam observation of the onset of growth in seven vegetation types. However, large bias was found between the Sentinel-2 NDVI-based mapped onset of growth and the phenocam-based onset of growth in a moss tundra, which indicates that the data in these vegetation types must be interpreted with care. In 2018, the onset of growth was about 10 days earlier compared to 2017.en_US
dc.identifier.citationKarlsen, Stendardi, Tømmervik, Nilsen, Arntzen, Cooper. Time-series of cloud-free sentinel-2 ndvi data used in mapping the onset of growth of central spitsbergen, svalbard. Remote Sensing. 2021;13(15):1-14en_US
dc.identifier.cristinIDFRIDAID 1928193
dc.identifier.doi10.3390/rs13153031
dc.identifier.issn2072-4292
dc.identifier.urihttps://hdl.handle.net/10037/22824
dc.language.isoengen_US
dc.publisherMDPIen_US
dc.relation.journalRemote Sensing
dc.relation.projectIDNorges forskningsråd: 269927en_US
dc.relation.projectIDEU: 869471en_US
dc.relation.projectIDNorsk romsenter: NoSaen_US
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/FORINFRA/269927/Norway/Svalbard Integrated Arctic Earth Observing System - Infrastructure development of the Norwegian node (SIOS InfraNOR) - revised/SIOS InfraNOR/en_US
dc.relation.projectIDinfo:eu-repo/grantAgreement/EC/H2020/869471/EU/Drivers and Feedbacks of Changes in Arctic Terrestrial Biodiversity/CHARTER/en_US
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2021 The Author(s)en_US
dc.subjectVDP::Mathematics and natural science: 400en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400en_US
dc.titleTime-series of cloud-free sentinel-2 ndvi data used in mapping the onset of growth of central Spitsbergen, Svalbarden_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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