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  2. Long-Term Arctic Growing Season NDVI Trends from GIMMS 3g, 1982-2012

This data set provides normalized difference vegetation index (NDVI) data for the arctic growing season derived primarily with data from Advanced Very High Resolution Radiometer (AVHRR) sensors onboard several NOAA satellites over the years 1982 through 2012. The NDVI data, which show vegetation activity, were averaged annually for the arctic growing season (GS; June, July and August). The products include the annual GS-NDVI values and the results of a cumulative GS-NDVI time series trends analysis. The data are circumpolar in coverage at 8-km resolution and limited to greater than 20 degrees N. These normalized difference vegetation index (NDVI) trends were calculated using the third generation data set from the Global Inventory Modeling and Mapping Studies (GIMMS 3g). GIMMS 3g improves on its predecessor (GIMMS g) in three important ways. First, GIMMS 3g integrates data from NOAA-17 and 18 satellites to lengthen its record. Second, it addresses the spatial discontinuity north of 72 degrees N, by using SeaWiFS, in addition to SPOT VGT, to calibrate between the second and third versions of the AVHRR sensor (AVHRR/2 and AVHRR/3). Finally, the GIMMS 3g algorithm incorporates improved snowmelt detection and is calibrated based on data from the shorter, arctic growing season (May-September) rather than the entire year (January-December).

Guay, K.C., P.S.A. Beck, and S.J. Goetz. 2015. Long-Term Arctic Growing Season NDVI Trends from GIMMS 3g, 1982-2012. Data set. Available on-line [http://daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, USA. http://dx.doi.org/10.3334/ORNLDAAC/1275

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This data set contains 3 data granules
Granule Name Variables Metadata Preview Image
    Long-Term Arctic Growing Season Land Cover land cover Projection: WGS 84
Spatial Extent: N: 90, S: 20, E: 180, W: -180
Start DateTime: 1982
End DateTime: 2012
Long-Term Arctic Growing Season Land Cover
 
    Long-Term Arctic Growing Season NDVI Trends from GIMMS 3g (1982-2012) ndvi trend Projection: WGS 84
Spatial Extent: N: 90, S: 20, E: 180, W: -180
Start DateTime: 1982
End DateTime: 2012
Long-Term Arctic Growing Season NDVI Trends from GIMMS 3g (1982-2012)
 
    Long-Term Arctic Growing Season NDVI Trends Significance from GIMMS 3g (1982-2012) significance of ndvi trend Projection: WGS 84
Spatial Extent: N: 90, S: 20, E: 180, W: -180
Start DateTime: 1982
End DateTime: 2012
Long-Term Arctic Growing Season NDVI Trends Significance from GIMMS 3g (1982-2012)