The El Niño – La Niña cycle and recent trends in supply and demand of net primary productivity in African drylands
Yengoh, Genesis T.
Ummenhofer, Caroline C.
MetadataShow full item record
KeywordSub-Saharan Africa; Drylands; El Niño-Southern Oscillation; Net primary productivity; Climate variability
Inter-annual climatic variability over a large portion of sub-Saharan Africa is under the influence of the El Niño-Southern Oscillation (ENSO). Extreme variability in climate is a threat to rural livelihoods in sub-Saharan Africa, yet the role of ENSO in the balance between supply and demand of net primary productivity (NPP) over this region is unclear. Here, we analyze the impact of ENSO on this balance in a spatially explicit framework using gridded population data from the WorldPop project, satellite-derived data on NPP supply, and statistical data from the United Nations. Our analyses demonstrate that between 2000 and 2013 fluctuations in the supply of NPP associated with moderate ENSO events average ±2.8 g C m-2 yr-1 across sub-Saharan drylands. The greatest sensitivity is in arid Southern Africa where a +1oC change in the Niño-3.4 sea surface temperature index is associated with a mean change in NPP supply of -6.6 g C m-2 yr-1. Concurrently, the population-driven trend in NPP demand averages 3.5 g C m-2 yr-1 over the entire region with densely populated urban areas exhibiting the highest mean demand for NPP. Our findings highlight the importance of accounting for the role ENSO plays in modulating the balance between supply and demand of NPP in sub-Saharan drylands. An important implication of these findings is that increase in NPP demand for socio-economic metabolism must be taken into account within the context of climate-modulated supply
Author Posting. © The Author(s), 2016. This is the author's version of the work. It is posted here by permission of Springer for personal use, not for redistribution. The definitive version was published in Climatic Change 138 (2016): 111-125, doi:10.1007/s10584-016-1730-1.
Suggested CitationPreprint: Abdi, Abdulhakim, Vrieling, Anton, Yengoh, Genesis T., Anyamba, Assaf, Seaquist, Jonathan, Ummenhofer, Caroline C., Ardö, Jonas, "The El Niño – La Niña cycle and recent trends in supply and demand of net primary productivity in African drylands", 2016-07, https://doi.org/10.1007/s10584-016-1730-1, https://hdl.handle.net/1912/8469
Showing items related by title, author, creator and subject.
Stanley, Rachel H. R.; Kirkpatrick, John B.; Cassar, Nicolas; Barnett, Bruce A.; Bender, Michael L. (American Geophysical Union, 2010-10-12)Net community production (NCP) and gross primary production (GPP) are two key metrics for quantifying the biological carbon cycle. In this study, we present a detailed characterization of NCP and GPP in the western equatorial ...
The annual cycle of gross primary production, net community production, and export efficiency across the North Pacific Ocean Palevsky, Hilary I.; Quay, Paul D.; Lockwood, Deirdre E.; Nicholson, David P. (John Wiley & Sons, 2016-02-27)We measured triple oxygen isotopes and oxygen/argon dissolved gas ratios as nonincubation-based geochemical tracers of gross oxygen production (GOP) and net community production (NCP) on 16 container ship transects across ...
Evaluating triple oxygen isotope estimates of gross primary production at the Hawaii Ocean Time-series and Bermuda Atlantic Time-series Study sites Nicholson, David P.; Stanley, Rachel H. R.; Barkan, Eugeni; Karl, David M.; Luz, Boaz; Quay, Paul D.; Doney, Scott C. (American Geophysical Union, 2012-05-08)The triple oxygen isotopic composition of dissolved oxygen (17Δ) is a promising tracer of gross oxygen productivity (P) in the ocean. Recent studies have inferred a high and variable ratio of P to 14C net primary productivity ...