000			02143 am a22002533u 4500
042			_adc
100	1	0	_aKarlsen, Stein Rune _eauthor _92191
700	1	0	_aElvebakk, Arve _eauthor _92192
700	1	0	_aTømmervik, Hans _eauthor _92193
700	1	0	_aBelda, Santiago _eauthor _92194
700	1	0	_aStendardi, Laura _eauthor _92195
245	0	0	_aChanges in Onset of Vegetation Growth on Svalbard, 2000-2020
260			_c2022-12-15.
500			_a/pmc/articles/PMC7614054/
500			_a/pubmed/36643951
520			_aThe global temperature is increasing, and this is affecting the vegetation phenology in many parts of the world. The most prominent changes occur at northern latitudes such as our study area, which is Svalbard, located between 76°30'N and 80°50'N. A cloud-free time series of MODIS-NDVI data was processed. The dataset was interpolated to daily data during the 2000-2020 period with a 231.65 m pixel resolution. The onset of vegetation growth was mapped with a NDVI threshold method which corresponds well with a recent Sentinel-2 NDVI-based mapping of the onset of vegetation growth, which was in turn validated by a network of in-situ phenological data from time lapse cameras. The results show that the years 2000 and 2008 were extreme in terms of the late onset of vegetation growth. The year 2020 had the earliest onset of vegetation growth on Svalbard during the 21-year study. Each year since 2013 had an earlier or equally early timing in terms of the onset of the growth season compared with the 2000-2020 average. A linear trend of 0.57 days per year resulted in an earlier onset of growth of 12 days on average for the entire archipelago of Svalbard in 2020 compared to 2000.
540			_a
540			_ahttps://creativecommons.org/licenses/by/4.0/This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
546			_aen
690			_aArticle
655	7		_aText _2local
786	0		_nRemote Sens (Basel)
856	4	1	_uhttp://dx.doi.org/10.3390/rs14246346 _zConnect to this object online.
999			_c2198 _d2198