**5. Acknowledgment**

This study is financially supported by grants from the Canadian IPY program through a project entitled "Climate Change Impacts on Canadian Arctic Tundra Ecosystems (CiCAT): Interdisciplinary and Multi-scale Assessments", Canadian Space Agency's Government Related Initiatives Program (GRIP) through a project entitled "ParkSPACE: Towards an Operational Satellite-based System for Monitoring Ecological Integrity of Arctic National Parks", and from the Earth Sciences Sector, NRCan's "Climate Change Geosciences

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Program". Colleagues from CARMA (e.g., Drs. Don Russell, Wendy Nixon, and Brad Griffith) have provided great insights about research priorities and directions on caribou habitats. Parks Canada Agency (e.g., Dr. Don McLennan, Paul Dixon, et al.) organized 2008 field work in the Ivvavik National Park, arranged licence application, and provided logistics supports including helicopter riding and camping facility. David Jones and 3 northern students from Aklavik, NWT (Alexander Gordon, Jayneta Pascal, Kayla Arey) participated in and contributed his through knowledge of northern vegetation to the field measurement campaign in the summers of 2004, 2006, or 2008. Drs. Kyle McDonald of the Jet Propel Laboratory/NASA and Mahta Moghaddam of University of Michigan provided the JERS coverage over Canada's north. The Aurora Research institute and the Gwich'in Renewable Resource Board, Inuvik, NWT helped us in obtaining research licenses. Steve Wolfe of the Geological Survey Canada arranged the use of the laboratory space and biomass drying ovens. Drs. Yinsuo Zhang and Nadia Rochdi provided critical reviewed of the manuscript. The authors wish to thank all for providing their assistances.
