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A stochastic model for daily subsurface CO2 concentration and related soil respiration

Publication ,  Journal Article
Daly, E; Oishi, AC; Porporato, A; Katul, GG
Published in: Advances in Water Resources
July 1, 2008

Near-surface soil CO2 gas-phase concentration (C) and concomitant incident rainfall (Pi) and through-fall (Pt) depths were collected at different locations in a temperate pine forest every 30 min during the 2005 and 2006 growing seasons (and then averaged to the daily timescale). At the daily scale, C temporal variations were well described by a sequence of monotonically decreasing functions interrupted by large positive jumps induced by rainfall events. A stochastic model was developed to link rainfall statistics responsible for these jumps to near-surface C dynamics. The model accounted for the effect of daily rainfall variability, both in terms of timing and amount of water, and permitted an analytical derivation of the C probability density function (pdf) using the parameters of the rainfall pdf. Given the observed positive correlation between daily C and soil CO2 fluxes to the atmosphere (Fs), the effects of various rainfall regimes on the statistics of Fs can be deduced from the behavior of C under different climatic conditions. The predictions from this analytical model are consistent with flux measurements reported in manipulative experiments that varied rainfall amount and frequency. © 2008 Elsevier Ltd. All rights reserved.

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Published In

Advances in Water Resources

DOI

ISSN

0309-1708

Publication Date

July 1, 2008

Volume

31

Issue

7

Start / End Page

987 / 994

Related Subject Headings

  • Environmental Engineering
  • 4901 Applied mathematics
  • 4005 Civil engineering
  • 3707 Hydrology
  • 0907 Environmental Engineering
  • 0905 Civil Engineering
  • 0102 Applied Mathematics
 

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Daly, E., Oishi, A. C., Porporato, A., & Katul, G. G. (2008). A stochastic model for daily subsurface CO2 concentration and related soil respiration. Advances in Water Resources, 31(7), 987–994. https://doi.org/10.1016/j.advwatres.2008.04.001
Daly, E., A. C. Oishi, A. Porporato, and G. G. Katul. “A stochastic model for daily subsurface CO2 concentration and related soil respiration.” Advances in Water Resources 31, no. 7 (July 1, 2008): 987–94. https://doi.org/10.1016/j.advwatres.2008.04.001.
Daly E, Oishi AC, Porporato A, Katul GG. A stochastic model for daily subsurface CO2 concentration and related soil respiration. Advances in Water Resources. 2008 Jul 1;31(7):987–94.
Daly, E., et al. “A stochastic model for daily subsurface CO2 concentration and related soil respiration.” Advances in Water Resources, vol. 31, no. 7, July 2008, pp. 987–94. Scopus, doi:10.1016/j.advwatres.2008.04.001.
Daly E, Oishi AC, Porporato A, Katul GG. A stochastic model for daily subsurface CO2 concentration and related soil respiration. Advances in Water Resources. 2008 Jul 1;31(7):987–994.
Journal cover image

Published In

Advances in Water Resources

DOI

ISSN

0309-1708

Publication Date

July 1, 2008

Volume

31

Issue

7

Start / End Page

987 / 994

Related Subject Headings

  • Environmental Engineering
  • 4901 Applied mathematics
  • 4005 Civil engineering
  • 3707 Hydrology
  • 0907 Environmental Engineering
  • 0905 Civil Engineering
  • 0102 Applied Mathematics