Vegetation Greening Trend in Canada and Alaska: 1984-2012

  • Released Thursday, June 2, 2016
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This animation examines the change in the vegetation trend over Canada and Alaska between 1984 and 2012.

High-latitude regions have been warming rapidly since the last century, at a rate higher than the global average. At continental scales, satellite data since the 1980s have indicated increased vegetation productivity (greening) across northern high latitudes, and a productivity decline (browning) for certain areas of undisturbed boreal forest of Canada and Alaska. These remote sensing results have been corroborated by in-situ evidence.

This research provides a spatially complete view of the vegetation greenness change for all of Canada and Alaska by calculating per-pixel NDVI trend from all available 1984–2012 peak-summer Landsat-5 and -7 surface reflectance data. By incorporating observations from overlapping scenes, researchers obtained up to 160 valid NDVI values for certain areas from this 29-year period, establishing the mid-Summer greenness trend.

This animation shows the resulting greenness trend over Canada and Alaska with special attention focused on the regions of Quebec and northern Alaska.

The colorbar applied to the vegetation productivity trend data. Green colors indicate an increase while brown colors indicate a decrease.

The colorbar applied to the vegetation productivity trend data. Green colors indicate an increase while brown colors indicate a decrease.

A print resolution image of the greening trend over Quebec, Canada.

A print resolution image of the greening trend over Quebec, Canada.

A print resolution image of the greening trend over Canada and Alaska.

A print resolution image of the greening trend over Canada and Alaska.

Credits

Please give credit for this item to:
NASA's Scientific Visualization Studio

This page was originally published on Thursday, June 2, 2016.
This page was last updated on Wednesday, October 9, 2024 at 12:06 AM EDT.

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Related papers

http://www.sciencedirect.com/science/article/pii/S0034425716300013

http://www.sciencedirect.com/science/article/pii/S0034425716300013

Datasets used

  • Landsat NDVI Trend (1984–2012) [Landsat]

    ID: 934
    Dates used: 1984-2012

    This research used a nominal peak greenness period, July 1 to August 31, to accommodate tundra of all regions for Landsat data selection. We only considered the terrain-corrected scenes, excluding scenes that have cloud cover more than 80%. As a result, a total of 87,762 Landsat scenes over 1271 Path/Row locations were selected from 1984-2012. Of these, 63% were from Landsat-5, as Landsat-5 provided the only data source for 1984-1998 and continued to acquire data until 2011. This work aims to provide a spatially complete view of the vegetation greenness change for all of Canada and Alaska by calculating per-pixel NDVI trend from all available 1984-2012 peak-summer Landsat-5 and -7 surface reflectance data.

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