alexa Changes in Alaskan Tundra Ecosystems Estimated from MODIS Greenness Trends, 2000 to 2010
ISSN: 2469-4134

Journal of Remote Sensing & GIS
Open Access

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Research Article

Changes in Alaskan Tundra Ecosystems Estimated from MODIS Greenness Trends, 2000 to 2010

Christopher Potter1*, Shuang Li1,2 and Robert Crabtree3
1NASA Ames Research Centre, Moffett Field, CA, USA
2California State University Monterey Bay, Seaside, CA, USA
3Yellow Ecological Research Center, Bozeman, MT, USA
Corresponding Author : Christopher Potter
NASA Ames Research Centre
Mail Stop 232-21, Moffett Field
CA 94035, USA
Tel: 650-604-6164
E-mail: [email protected]
Received January 22, 2013; Accepted March 04, 2013; Published March 26, 2013
Citation: Potter C, Li S, Crabtree R (2013) Changes in Alaskan Tundra Ecosystems Estimated from MODIS Greenness Trends, 2000 to 2010. J Geophys Remote Sensing 2:107. doi:10.4172/2169-0049.1000107
Copyright: © 2013 Potter C, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
 

Abstract

Trends in the monthly moderate resolution Imaging Spectroradiometer (MODIS) Enhanced Vegetation Index (EVI) time-series were analyzed for tundra ecosystems of Alaska over the past decade. Results showed that 10% of all tundra-dominated areas in Alaska were detected with significant (p<0.05) positive or negative MODIS growing season EVI trends from 2000 to 2010. Nearly three-quarters of these pixel areas were detected with significant positive growing season EVI trends. This 3:1 ratio of positive to negative EVI trends was consistent across both wetland and nonwetland tundra cover categories. Ecoregions of Alaska that revealed the highest density of positive areas for tundra growing season EVI slope were along the Pacific coast, namely the western Arctic Foothills, the Seward Peninsula, and the southern coastal plain. Associations between annual temperature and moisture patterns and tundra EVI trends across these regions revealed that change patterns in both the climate moisture index (CMI) and growing degree days (GDD) were related to increasing tundra EVI growing season trends. Results showed a notable association between the largest positive trends in MODIS greenness and annual warming trends of greater than 2 GDD per year.

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