A possible mechanism for soil moisture bimodality in humid-land environments

Details A possible mechanism for soil moisture bimodality in humid-land environments A possible mechanism for soil moisture bimodality in humid-land environments

Apr 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3607402d&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 7, CiteID L07402

Mathematics

Probability

2

Hydrology: Soil Moisture, Hydrology: Eco-Hydrology, Hydrology: Water Budgets

Scientific paper

The origin and causes for the existence of two distinct steady-state modes of soil moisture probability distribution (pdf) have been attributed to several processes, such as land-atmosphere feedbacks or shifts in climatic conditions within seasons. Here we argue that the interaction between saturated and unsaturated zones in soils with shallow water tables might represent a possible mechanism leading to such bimodality. This conclusion is achieved by analyzing soil water content measurements in vegetated soil columns artificially constructed in a laboratory. We used these observations to develop a stochastic model for the daily soil water balance, which shows how the interplay between the water table and the unsaturated zone is able to induce soil moisture bimodality.

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