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Title: Cross-scale impact of climate temporal variability on ecosystem water and carbon fluxes

Journal Article · · Journal of Geophysical Research. Biogeosciences
DOI:https://doi.org/10.1002/2015JG003002· OSTI ID:1454922
 [1];  [2];  [3];  [4]
  1. Duke Univ., Durham, NC (United States). Nicholas School of the Environment; Institute of Environmental Engineering, ETH Zurich (Switzerland)
  2. Institute of Environmental Engineering, ETH Zurich (Switzerland)
  3. Duke Univ., Durham, NC (United States). Nicholas School of the Environment and Department of Civil and Environmental Engineering
  4. Univ. of Michigan, Ann Arbor, MI (United States). Department of Civil and Environmental Engineering

Abstract While the importance of ecosystem functioning is undisputed in the context of climate change and Earth system modeling, the role of short‐scale temporal variability of hydrometeorological forcing (~1 h) on the related ecosystem processes remains to be fully understood. Various impacts of meteorological forcing variability on water and carbon fluxes across a range of scales are explored here using numerical simulations. Synthetic meteorological drivers that highlight dynamic features of the short temporal scale in series of precipitation, temperature, and radiation are constructed. These drivers force a mechanistic ecohydrological model that propagates information content into the dynamics of water and carbon fluxes for an ensemble of representative ecosystems. The focus of the analysis is on a cross‐scale effect of the short‐scale forcing variability on the modeled evapotranspiration and ecosystem carbon assimilation. Interannual variability of water and carbon fluxes is emphasized in the analysis. The main study inferences are summarized as follows: (a) short‐scale variability of meteorological input does affect water and carbon fluxes across a wide range of time scales, spanning from the hourly to the annual and longer scales; (b) different ecosystems respond to the various characteristics of the short‐scale variability of the climate forcing in various ways, depending on dominant factors limiting system productivity; (c) whenever short‐scale variability of meteorological forcing influences primarily fast processes such as photosynthesis, its impact on the slow‐scale variability of water and carbon fluxes is small; and (d) whenever short‐scale variability of the meteorological forcing impacts slow processes such as movement and storage of water in the soil, the effects of the variability can propagate to annual and longer time scales.

Research Organization:
Duke Univ., Durham, NC (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
SC0006967; SC0011461
OSTI ID:
1454922
Alternate ID(s):
OSTI ID: 1402273
Journal Information:
Journal of Geophysical Research. Biogeosciences, Vol. 120, Issue 9; ISSN 2169-8953
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 37 works
Citation information provided by
Web of Science

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