Vapor flow control in dune sediments under dry bare soil conditions
Claus Kohfahl1, Maarten W Saaltink2, Fernando Ruiz Bermudo1
1Instituto Geológico y Minero de España, Plaza de España, 41013 Seville, Spain.
The Science of the Total Environment
|May 7, 2021
Summary
This study quantifies soil vapor flux using lysimeter data, revealing moderate correlations between outward flux and diurnal temperature/humidity. Inward flux showed links to temperature and soil moisture.
Area of Science:
- Environmental Science
- Soil Science
- Atmospheric Science
Background:
- Understanding soil-atmosphere vapor exchange is crucial for hydrological and meteorological models.
- Quantifying vapor flux dynamics is essential for water resource management and climate studies.
Purpose of the Study:
- To analyze daily inward and outward vapor flux at the soil-atmosphere boundary.
- To determine the influence of meteorological parameters and soil moisture on vapor flux.
- To develop a correction coefficient for estimating actual evaporation from potential evaporation.
Main Methods:
- Utilized a precision lysimeter to measure vapor flux at 1-minute intervals from 2015-2019.
- Collected on-site meteorological data (temperature, humidity, wind velocity, net radiation) at 10-minute intervals.
- Processed lysimeter data for noise elimination and generated time series for analysis.
Main Results:
- Daily outward vapor flux exhibited moderate correlations with diurnal temperature and humidity amplitudes.
- Daily inward vapor flux showed moderate correlations with temperature and soil moisture.
- A correction coefficient was derived using soil moisture and air temperature to estimate actual evaporation.
Conclusions:
- Meteorological factors and soil moisture significantly influence soil vapor flux dynamics.
- The derived correction coefficient aids in more accurate actual evaporation estimations.
- Lysimeter data provides valuable insights into soil-atmosphere interactions in arid environments.
Keywords:
DoñanaEvaporation measurementsNonrainfall-precipitation, bare soilPrecision lysimeterVapor adsorptionMore Related Videos
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