Global and regional variability and change in terrestrial ecosystems net primary production and NDVI: A model-data comparison

Rafique, Rashid; Zhao, Fang; de Jong, Rogier; Zeng, Ning; Asrar, Ghassem

doi:10.3390/rs8030177

Title: Global and regional variability and change in terrestrial ecosystems net primary production and NDVI: A model-data comparison

Journal Article · Thu Feb 25 00:00:00 EST 2016 · Remote Sensing

DOI:https://doi.org/10.3390/rs8030177· OSTI ID:1255393

^[1]; Zhao, Fang ^[2]; de Jong, Rogier ^[3]; Zeng, Ning ^[4]; Asrar, Ghassem ^[1]

Pacific Northwest National Lab., College Park, MD (United States)
Univ. of Maryland, College Park, MD (United States); Potsdam Institute for Climate Impact Research, Potsdam (Germany)
Univ. of Zurich, Zurich (Switzerland)
Univ. of Maryland, College Park, MD (United States)

The net primary productivity (NPP) is commonly used for understanding the dynamics of terrestrial ecosystems and their role in carbon cycle. We used a combination of the most recent NDVI and model–based NPP estimates (from five models of the TRENDY project) for the period 1982-2012, to study the role of terrestrial ecosystems in carbon cycle under the prevailing climate conditions. We found that 80% and 67% of the global land area showed positive NPP and NDVI values, respectively, for this period. The global NPP was estimated to be about 63 Pg C y^-1, with an increase of 0.214 Pg C y^-1 y^-1. Similarly, the global mean NDVI was estimated to be 0.33, with an increasing trend of 0.00041 y-1. The spatial patterns of NPP and NDVI demonstrated substantial variability, especially at the regional level, for most part of the globe. However, on temporal scale, both global NPP and NDVI showed a corresponding pattern of increase (decrease) for the duration of this study except for few years (e.g. 1990 and 1995-98). Generally, the Northern Hemisphere showed stronger NDVI and NPP increasing trends over time compared to the Southern Hemisphere; however, NDVI showed larger trends in Temperate regions while NPP showed larger trends in Boreal regions. Among the five models, the maximum and minimum NPP were produced by JULES (72.4 Pg C y^-1) and LPJ (53.72 Pg C y^-1) models, respectively. At latitudinal level, the NDVI and NPP ranges were ~0.035 y^-1 to ~-0.016 y^-1 and ~0.10 Pg C y^-1 y^-1 to ~-0.047 Pg C y^-1 y^-1, respectively. Overall, the results of this study suggest that the modeled NPP generally correspond to the NDVI trends in the temporal dimension. Lastly, the significant variability in spatial patterns of NPP and NDVI trends points to a need for research to understand the causes of these discrepancies between molded and observed ecosystem dynamics, and the carbon cycle.

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Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1255393

Report Number(s):: PNNL-SA-115751

Journal Information:: Remote Sensing, Vol. 8, Issue 3; ISSN 2072-4292

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 48 works

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