Radiative and precipitation controls on root zone soil moisture spectra
- Nagoya University (Japan). Hydrospheric Atmospheric Research Center; University of Alaska, Fairbanks, AK (United States)
- 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
- Nagoya University (Japan). Graduate School of Bioagricultural Sciences
- Nagoya University (Japan). Hydrospheric Atmospheric Research Center
- 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
Web of Science
The global distribution and dynamics of surface soil moisture
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journal | January 2017 |
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