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Analysis of monotonic greening and browning trends from global NDVI time-series
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Remotely sensed vegetation indices are widely used to detect greening and browning trends; especially the global coverage of time-series normalized difference vegetation index (NDVI) data which are available from 1981. Seasonality and serial auto-correlation in the data have previously been dealt with by integrating the data to annual values; as an alternative to reducing the temporal resolution, we apply harmonic analyses and non-parametric trend tests to the GIMMS NDVI dataset (1981–2006). Using the complete dataset, greening and browning trends were analyzed using a linear model corrected for seasonality by subtracting the seasonal component, and a seasonal non-parametric model. In a third approach, phenological shift and variation in length of growing season were accounted for by analyzing the time-series using vegetation development stages rather than calendar days. Results differed substantially between the models, even though the input data were the same. Prominent regional greening trends identified by several other studies were confirmed but the models were inconsistent in areas with weak trends. The linear model using data corrected for seasonality showed similar trend slopes to those described in previous work using linear models on yearly mean values. The non-parametric models demonstrated the significant influence of variations in phenology; accounting for these variations should yield more robust trend analyses and better understanding of vegetation trends.
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Resources
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Climate Science Documents
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Agenda - March 11, 2015 Workshop
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Urban Woodlands Conservation and Management Workshop. Organized and facilitated by the National Park Service to identify and create opportunities for greater collaboration among urban woodland researchers and managers working to restore and manage urban woodland ecosystems.
To view the goals and objectives of the workshop, please open the workshop agenda.
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Cultural Resources
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Urban Conservation
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Urban Woodlands Conservation and Restoration
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North Atlantic LCC - NFWPCAS Strategy Crosswalk
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North Atlantic LCC - NFWPCAS Crosswalk of strategies and actions
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Cooperative
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AppLCC-NALCC_reporting_coord
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Climate and Nat'l Adaptation Reporting
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National Fish Wildlife and Plants Climate Adaptation Strategy strategies and goals
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National Fish Wildlife and Plants Climate Adaptation Strategy goals, strategies and actions from Chapter 3 of the document
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Cooperative
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AppLCC-NALCC_reporting_coord
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Climate and Nat'l Adaptation Reporting
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100 Case Studies Published Today Show How Communities Are Preparing Our Roads, Airports, and Transit Systems for Climate Change
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One hundred case studies released today by the Georgetown Climate Center demonstrate how leaders are responding to the growing threats from climate change to America's roads, airports, transit systems, and infrastructure.
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News & Events
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Secretary Jewell Announces New Wildlife and Climate Studies at the Northeast Climate Science Center
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Secretary of the Interior Sally Jewell announced recently that Interior’s Northeast Climate Science Center (NE CSC) is awarding nearly $700,000 to universities and other partners for research to guide managers of parks, refuges and other cultural and natural resources in planning how to help species and ecosystems adapt to climate change.
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News & Events
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Acquiring Information on the Climate Vulnerability of Appalachian Species and Habitats
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A new report out of the Climate Change Vulnerability Assessment research project addresses how the Cooperative should acquire information about the climate vulnerability of Appalachian species and habitats and share with its partners.
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News & Events
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New Recommendations Help Improve America’s Resilience to Climate Change
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This week, the White House released the recommendations of the President’s State, Local and Tribal Leaders Task Force on Climate Preparedness and Resilience. It also announced new tools and actions to help planners build healthy and resilient communities, including a web-based Climate Resilience Toolkit that provides simple access to federal tools that can help planners incorporate a changing climate into their decisions.
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News & Events
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GOT TREES? Building Climate-Ready Agriculture.
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Agricultural lands are having to meet ever-increasing production and conservation targets. At the same time agriculture’s capacity to deliver these services is being challenged by shifting climate, changing markets, and evolving environmental conditions.
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News & Events
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Climate Change's Growing Threat to Public Lands
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Secretary Jewell attended the 2014 World Parks Congress in Australia, where she stressed the need for international cooperation on public lands and the growing threat of climate change.
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Training
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Videos and Webinars
