U.S. Department of Energy Office of Biological and Environmental Research

BER Research Highlights


Observational Analysis of Land-Atmosphere Coupling Provides Standards for Evaluating Climate Models
Published: January 28, 2014
Posted: August 11, 2014

Global climate model simulations of northern-hemisphere summer climate imply that soil moisture couples strongly with precipitation and other atmospheric variables in semi-arid regions such as the U.S. Southern Great Plains (SGP). The long-time dataset from the Atmospheric Radiation Measurement (ARM) SGP site near Lamont, Oklahoma, provided the data to evaluate these model predictions. In this study, U.S. Department of Energy (DOE) researchers at Lawrence Livermore National Laboratory estimated the strength of land-atmosphere coupling from correlations of soil moisture with a diverse set of atmospheric variables observed during the summers of 1997-2008 at the SGP site. Local soil moisture correlated significantly with surface evaporation, relative humidity, and temperature, as well as with the base heights of clouds in the atmospheric boundary layer. These correlations grew stronger as the soil increasingly dried out in the aftermath of precipitation events. Contrary to the climate model predictions, no significant correlation of soil moisture with subsequent precipitation events was found, indicating that the coupling between local soil conditions and precipitation initiation is too strong in the climate models. Further evaluation and development of the models’ land-surface and boundary layer parameterizations are needed to identify and address the specific reasons for these discrepancies.  The datasets of observed characteristics of SGP land-atmosphere coupling developed in this study will provide a basis for future diagnosis and improvement of the climate model parameterizations using a testbed framework developed by DOE researchers.

Reference: Phillips, T. J., and S.A. Klein. 2014. “Land-Atmosphere Coupling Manifested in Warm-Season Observations on the U.S. Southern Great Plains,” Journal of Geophysical Research—Atmospheres 119(2), 509-28. DOI:10.1002/2013/D020492. (Reference link)

Contact: Wanda Ferrell, SC-23.1, (301) 903-0043, Sally McFarlane, SC-23.1, (301) 903-0943
Topic Areas:

  • Research Area: Earth and Environmental Systems Modeling
  • Research Area: Atmospheric System Research
  • Facility: DOE ARM User Facility

Division: SC-23.1 Climate and Environmental Sciences Division, BER

 

BER supports basic research and scientific user facilities to advance DOE missions in energy and environment. More about BER

Recent Highlights

May 10, 2019
Quantifying Decision Uncertainty in Water Management via a Coupled Agent-Based Model
Considering risk perception can improve the representation of human decision-making processes in age [more...]

May 09, 2019
Projecting Global Urban Area Growth Through 2100 Based on Historical Time Series Data and Future Scenarios
Study provides country-specific urban area growth models and the first dataset on country-level urba [more...]

May 05, 2019
Calibrating Building Energy Demand Models to Refine Long-Term Energy Planning
A new, flexible calibration approach improved model accuracy in capturing year-to-year changes in bu [more...]

May 03, 2019
Calibration and Uncertainty Analysis of Demeter for Better Downscaling of Global Land Use and Land Cover Projections
Researchers improved the Demeter model’s performance by calibrating key parameters and establi [more...]

Apr 22, 2019
Representation of U.S. Warm Temperature Extremes in Global Climate Model Ensembles
Representation of warm temperature events varies considerably among global climate models, which has [more...]

List all highlights (possible long download time)