A Comparison of NOAA Modeled and In Situ Soil Moisture Estimates Across
the Continental United States
Abstract
Three estimates of soil moisture from National Oceanic and Atmospheric
Administration (NOAA) programs are compared. The estimates are from a
high-resolution atmospheric model with a land surface model, a
hydrologic model and in situ observations. Both models demonstrate
wetter soil moisture in dry regions and drier soil moistures in wet
regions, as compared to the in situ observations. These soil moisture
differences occur at most soil depths but are larger at the deeper
depths below the surface (100 cm). In terms of soil moisture variance,
both models generally have lower standard deviations as compared to the
in situ observations, except for near the surface where the in situ and
high-resolution, land surface model compare well. These NOAA soil
moisture estimates are used for a variety of forecasting and societal
applications, and understanding their differences provides important
context for their applications and can lead to model improvements.