Dynamic process connectivity explains ecohydrologic responses to rainfall pulses and drought

Proceedings of the National Academy of Sciences of the United States of America
Allison E GoodwellGerald N Flerchinger

Abstract

Ecohydrologic fluxes within atmosphere, vegetation, and soil systems exhibit a joint variability that arises from forcing and feedback interactions. These interactions cause fluctuations to propagate between variables at many time scales. In an ecosystem, this connectivity dictates responses to climate change, land-cover change, and weather events and must be characterized to understand resilience and sensitivity. We use an information theory-based approach to quantify connectivity in the form of information flow associated with the propagation of fluctuations between variables. We apply this approach to study ecosystems that experience changes in dry-season moisture availability due to rainfall and drought conditions. We use data from two transects with flux towers located along elevation gradients and quantify redundant, synergistic, and unique flow of information between lagged sources and targets to characterize joint asynchronous time dependencies. At the Reynolds Creek Critical Zone Observatory in Idaho, a dry-season rainfall pulse leads to increased connectivity from soil and atmospheric variables to heat and carbon fluxes. At the Southern Sierra Critical Zone Observatory in California, separate sets of dominant drivers ...Continue Reading

References

Mar 23, 2012·The American Naturalist·Matteo DettoDennis Baldocchi
Jun 13, 2015·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Adam B Barrett
Mar 28, 2018·Scientific Reports·Ziad Al Bkhetan, Dariusz Plewczynski
Mar 1, 2016·Journal of Hydrometeorology·Grey S NearingYoulong Xia
Jan 12, 2018·Entropy·Alicia SendrowskiPaola Passalacqua

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Citations

Feb 20, 2019·Physical Review. E·Peishi Jiang, Praveen Kumar
Mar 13, 2021·Science·Julia Hall, Rui A P Perdigão

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