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Title: Radiative and precipitation controls on root zone soil moisture spectra

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1002/2014GL061745· OSTI ID:1454924
ORCiD logo [1];  [2];  [3];  [4];  [3];  [5];  [4]
  1. Nagoya University (Japan). Hydrospheric Atmospheric Research Center; University of Alaska, Fairbanks, AK (United States)
  2. Nagoya University (Japan). Hydrospheric Atmospheric Research Center; Duke Univ., Durham, NC (United States). Nicholas School of the Environment and Department of Civil and Environmental Engineering
  3. Nagoya University (Japan). Graduate School of Bioagricultural Sciences
  4. Nagoya University (Japan). Hydrospheric Atmospheric Research Center
  5. University of Tokyo (Japan). Graduate School of Agricultural and Life Science

Here, we present that temporal variability in root zone soil moisture content (w) exhibits a Lorentzian spectrum with memory dictated by a damping term when forced with white-noise precipitation. In the context of regional dimming, radiation and precipitation variability are needed to reproduce w trends prompting interest in how the w memory is altered by radiative forcing. A hierarchy of models that sequentially introduce the spectrum of precipitation, net radiation, and the effect of w on evaporative and drainage losses was used to analyze the spectrum of w at subtropical and temperate forested sites. Reproducing the w spectra at long time scales necessitated simultaneous precipitation and net radiation measurements depending on site conditions. The w memory inferred from observed w spectra was 25–38 days, larger than that determined from maximum wet evapotranspiration and field capacity. Finally, the w memory can be reasonably inferred from the Lorentzian spectrum when precipitation and evapotranspiration are in phase.

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:
1454924
Alternate ID(s):
OSTI ID: 1402152
Journal Information:
Geophysical Research Letters, Vol. 41, Issue 21; ISSN 0094-8276
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

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The global distribution and dynamics of surface soil moisture journal January 2017

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