A new estimate of tundra-biome phytomass from trans-Arctic field data and AVHRR NDVI
نویسندگان
چکیده
A new estimate of tundra-biome phytomass from trans-Arctic field data and AVHRR NDVI Martha K. Raynolds a , Donald A. Walker a , Howard E. Epstein b , Jorge E. Pinzon c & Compton J. Tucker c a Institute of Arctic Biology, University of Alaska, Fairbanks, AK, 99775, USA b Department of Environmental Sciences, University of Virginia, Charlottesville, VA, 22904, USA c Biospheric Science Branch, NASA Goddard Space Flight Center, Greenbelt, MD, 20771, USA
منابع مشابه
Biotic controls over spectral reflectance of arctic tundra vegetation
In this study, seasonal field measurements of the normalized difference vegetation index (NDVI), using a field spectroradiometer, and leaf area index (LAI), using a LI-COR LAI-2000 Plant Canopy Analyzer, were compared with above-ground phytomass data to investigate relationships between vegetation properties and spectral indices for four distinct tundra vegetation types at Ivotuk, Alaska (68.49...
متن کاملNDVI patterns and phytomass distribution in the circumpolar Arctic
The Circumpolar Arctic Vegetation Map (CAVM) was used to analyze the distribution of NDVI and phytomass in the Arctic, providing data for understanding arctic vegetation patterns, assessing change, and calibrating models. The dominant trend in the analysis of Normalized Difference Vegetation Index (NDVI) was a decrease from south to north, correlating with bioclimate subzones and vegetation uni...
متن کاملThe relationship between phytomass, NDVI and vegetation communities on Svalbard
Several studies have shown a close relationship between vegetation fertility and different vegetation indices extracted from satellite data. The vegetation fertility in Arctic is at overall scales highly related to temperature. At lower scales surface material, snow cover, hydrology and anthropogenic effects (geese, reindeer) are determinant in constituting the different vegetation communities....
متن کاملBiome Shifts in Siberian Arctic Tundra: Evidence from Five Decades of Space-based Earth Observation
Increasing abundance of tall, canopy-forming shrubs is one of the primary changes expected in the Arctic tundra biome with recent climate warming, but virtually all evidence for shrub increase comes from North America. Here we demonstrate a novel technique for assessing changes in the extent of tall shrublands in northwest Siberian tundra since the 1960s, using satellite imagery dating to the e...
متن کاملControls over intra-seasonal dynamics of AVHRR NDVI for the Arctic tundra in northern Alaska
We analysed the Normalized Difference Vegetation Index (NDVI), calculated from biweekly NOAA Advanced Very High Resolution Radiometer (AVHRR) images for northern Alaska at both regional (latitudinal gradients) and site scales. Our objectives were to determine if tundra types and arctic subzones could be differentiated in terms of intra-seasonal patterns of greenness, and to construct the relati...
متن کامل