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Causal interaction in high frequency turbulence at the biosphere–atmosphere interface: Structure–function coupling

Journal Article · · Chaos: An Interdisciplinary Journal of Nonlinear Science
DOI:https://doi.org/10.1063/5.0131469· OSTI ID:2282167
 [1];  [2]
  1. University of Illinois at Urbana-Champaign, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); University of Illinois at Urbana - Champaign
  2. University of Illinois at Urbana-Champaign, IL (United States)
At the biosphere–atmosphere interface, nonlinear interdependencies among components of an ecohydrological complex system can be inferred using multivariate high frequency time series observations. Information flow among these interacting variables allows us to represent the causal dependencies in the form of a directed acyclic graph (DAG). Here, we use high frequency multivariate data at 10 Hz from an eddy covariance instrument located at 25 m above agricultural land in the Midwestern US to quantify the evolutionary dynamics of this complex system using a sequence of DAGs by examining the structural dependency of information flow and the associated functional response. We investigate whether functional differences correspond to structural differences or if there are no functional variations despite the structural differences. We base our analysis on the hypothesis that causal dependencies are instigated through information flow, and the resulting interactions sustain the dynamics and its functionality. To test our hypothesis, we build upon causal structure analysis in the companion paper to characterize the information flow in similarly clustered DAGs from 3-min non-overlapping contiguous windows in the observational data. We characterize functionality as the nature of interactions as discerned through redundant, unique, and synergistic components of information flow. Through this analysis, we find that in turbulence at the biosphere–atmosphere interface, the variables that control the dynamic character of the atmosphere as well as the thermodynamics are driven by non-local conditions, while the scalar transport associated with CO and H2O is mainly driven by short-term local conditions.
Research Organization:
University of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Advanced Research Projects Agency - Energy (ARPA-E)
Grant/Contract Number:
AR0001225
OSTI ID:
2282167
Journal Information:
Chaos: An Interdisciplinary Journal of Nonlinear Science, Journal Name: Chaos: An Interdisciplinary Journal of Nonlinear Science Journal Issue: 7 Vol. 33; ISSN 1054-1500
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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