Earth  ID: 4452

Vegetation greening trend in Canada and Alaska: 1984-2012

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.
 

Used Elsewhere In


Visualization Credits

Cindy Starr (GST): Lead Visualizer
Junchang Ju (USRA): Scientist
Jeffrey Masek (NASA/GSFC): Scientist
Matthew R. Radcliff (USRA): Producer
Eric Sokolowsky (GST): Data Provider
Joycelyn Thomson Jones (NASA/GSFC): Project Support
Leann M. Estrada (GST): Project Support
Laurence Schuler (ADNET Systems, Inc.): Technical Support
Ian Jones (ADNET Systems, Inc.): Technical Support
Please give credit for this item to:
NASA's Scientific Visualization Studio

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

Short URL to share this page:
http://svs.gsfc.nasa.gov/4452

Missions:
Landsat
LDCM: Landsat Data Continuity Mission

Data Used:
Landsat/Landsat NDVI Trend (1984–2012) 1984-2012

Keywords:
SVS >> Landsat
SVS >> NDVI
GCMD >> Location >> Canada
GCMD >> Location >> Alaska
SVS >> Hyperwall
NASA Science >> Earth

GCMD keywords can be found on the Internet with the following citation: Olsen, L.M., G. Major, K. Shein, J. Scialdone, S. Ritz, T. Stevens, M. Morahan, A. Aleman, R. Vogel, S. Leicester, H. Weir, M. Meaux, S. Grebas, C.Solomon, M. Holland, T. Northcutt, R. A. Restrepo, R. Bilodeau, 2013. NASA/Global Change Master Directory (GCMD) Earth Science Keywords. Version 8.0.0.0.0