Skip to main content

Passive microwave emission from smooth bare soils: developing a simple model to predict near surface water content

Buy Article:

$55.00 plus tax (Refund Policy)

MICRO-SWEAT is a coupled microwave emission and soilvegetation-atmosphere transfer scheme. It can predict, among other things, the L band (21 cm wavelength) microwave brightness temperature (TB) for a smooth bare soil from knowledge of the soil hydraulic properties and local meteorological data. TB is the product of the apparent emissivity (eapp) and the effective physical temperature of the soil profile (Teff). The modelled relationship between e app and average 0-2 cm soil water content was used to develop a simple semi-empirical model, which predicts the near surface water content from knowledge of the particle size distribution and eapp. Teff was found to be comparable to the soil temperature at 11 cm depth, and was estimated using a simple sinusoidal function based on thermal diffusivity to extrapolate the temperature at 11 cm depth from knowledge of the diurnal variation in air temperature. The dependence of TB on incidence angle was predicted by MICRO-SWEAT and also incorporated. This simple model was then successfully used to predict the 0-2 cm water content from knowledge of TB, the air temperature regime and the particle size distribution, for data collected at various look angles over three different soils using a truck-based radiometer.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
No Metrics

Document Type: Research Article

Affiliations: 1: Department of Hydrology and Water Resources, University of Arizona, Tucson, AZ 85721, USA 2: Department of Soil Science, University of Reading, Whiteknights, Reading, RG6 6DW, UK

Publication date: 2001-12-15

More about this publication?
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more