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Remote Sens. 2015, 7(8), 9492-9506; doi:10.3390/rs70809492

Warming, Sheep and Volcanoes: Land Cover Changes in Iceland Evident in Satellite NDVI Trends

1
Institute of Arctic Biology, University of Alaska Fairbanks, PO Box 757000, Fairbanks AK 99775, USA
2
Icelandic Institute of Natural History, PO Box 125, 212 Garðabær, Iceland
*
Author to whom correspondence should be addressed.
Academic Editors: Santonu Goswami, Daniel J. Hayes, Guido Grosse, Benjamin Jones, Alfredo R. Huete and Prasad S. Thenkabail
Received: 20 February 2015 / Revised: 12 July 2015 / Accepted: 20 July 2015 / Published: 24 July 2015
(This article belongs to the Special Issue Remote Sensing of Changing Northern High Latitude Ecosystems)
View Full-Text   |   Download PDF [7554 KB, uploaded 24 July 2015]   |  

Abstract

In a greening Arctic, Iceland stands out as an area with very high increases in the AVHRR Normalized Difference Vegetation Index (NDVI, 1982–2010). We investigated the possible sources of this anomalous greening in Iceland’s dynamic landscape, analyzing changes due to volcanism and warming temperatures, and the effects of agricultural and industrial land use changes. The analysis showed the increases were likely due to reductions in grazing in erosion-prone rangelands, extensive reclamation and afforestation efforts, as well as a response to warming climate, including glacial retreat. Like Scandinavia and much of the rest of the Arctic, Iceland has shown a recent reduction in NDVI since 2002, but still above pre-2000 levels. Theil-Sen robust regression analysis of MODIS NDVI trends from 2002 to 2013 showed Iceland had a slightly negative NDVI trend of 0.003 NDVI units/year (p < 0.05), with significant decreases in an area three times greater (29,809 km2) than that with increases (9419 km2). Specific areas with large decreases in NDVI during the last decade were due to the formation of a large reservoir as a part of a hydroelectric power project (Kárahnjúkar, 2002–2009), and due to ashfall from two volcanic eruptions (Eyjafjallajökull, 2010; Grímsvötn, 2011). Increases in NDVI in the last decade were found in erosion control areas, around retreating glaciers, and in other areas of plant colonization following natural disturbance. Our analysis demonstrates the effectiveness of MODIS NDVI for identifying the causes of changes in land cover, and confirms the reduction in NDVI in the last decade using both the AVHRR and MODIS satellite data. View Full-Text
Keywords: AHVRR; MODIS; land cover; land use; NDVI AHVRR; MODIS; land cover; land use; NDVI
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Raynolds, M.; Magnússon, B.; Metúsalemsson, S.; Magnússon, S.H. Warming, Sheep and Volcanoes: Land Cover Changes in Iceland Evident in Satellite NDVI Trends. Remote Sens. 2015, 7, 9492-9506.

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