Journal article
El Niño‐Southern Oscillation‐Induced Variability of Terrestrial Gross Primary Production During the Satellite Era
Journal of geophysical research. Biogeosciences, Vol.124(8), pp.2419-2431
08/2019
DOI: 10.1029/2019JG005117
Appears in Open For Climate Justice
Abstract
Terrestrial gross primary production (GPP) is the largest carbon flux entering the biosphere from the atmosphere, which serves as a key driver of global carbon cycle and provides essential matter and energy for life on land. However, terrestrial GPP variability is still poorly understood and difficult to predict, especially at the annual scale. As a major internal climate oscillation, El Niño‐Southern Oscillation (ENSO) influences global climate patterns and thus may strongly alter interannual terrestrial GPP variation. Using a remote sensing‐driven ecosystem model with long‐term satellite and climate data, we comprehensively examined the impacts of ENSO on global GPP dynamics from 1982 to 2016, focusing on lag effects of ENSO and their spatial heterogeneity. We found a clear seasonal lag effect of previous‐year ENSO indices on current‐year global GPP variability. The composite Oceanic Niño Index in the previous‐year's August‐October showed the strongest correlation with global annual GPP (R = −0.51, p < 0.01). Spatially, 20.1% and 11.7% of vegetated land area showed significant negative and positive correlations with the ENSO cycle, respectively. ENSO effects on annual GPP exhibited diverse seasonal evolutions, and the timings of peak ENSO influences were heterogeneous across the globe. Annual GPP from TRENDY land surface model ensemble did not capture the major lag effects of ENSO identified in the satellite‐derived GPP and top‐down‐based land sink. Despite the complexity of the climate system, our efforts linking ENSO with global GPP dynamics provide a simple framework to understand and project climatic influences on the terrestrial carbon cycle.
Key Points
The composite ONI in the previous‐year's August‐October shows the strongest correlation with global annual GPP
ENSO effects on annual GPP exhibit diverse seasonal evolutions, and the timing of peak ENSO influences are heterogeneous across the globe
TRENDY ensemble appears to miss the major lag effects of ENSO identified in the satellite‐derived GPP and top‐down‐based land carbon sink
Details
- Title: Subtitle
- El Niño‐Southern Oscillation‐Induced Variability of Terrestrial Gross Primary Production During the Satellite Era
- Creators
- Yulong Zhang - University of North Carolina at Chapel HillMatthew P. Dannenberg - University of IowaTaehee Hwang - Indiana UniversityConghe Song - University of North Carolina at Chapel Hill
- Resource Type
- Journal article
- Publication Details
- Journal of geophysical research. Biogeosciences, Vol.124(8), pp.2419-2431
- DOI
- 10.1029/2019JG005117
- ISSN
- 2169-8953
- eISSN
- 2169-8961
- Number of pages
- 13
- Grant note
- NASA Carbon Cycle Sciences (NNX17AE69G)
- Language
- English
- Date published
- 08/2019
- Academic Unit
- Geographical and Sustainability Sciences
- Record Identifier
- 9984259637802771
Metrics
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