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

BER Research Highlights

Understanding Deep Convection in the Midlatitudes
Published: December 01, 2012
Posted: February 26, 2013

A team of scientists from Pacific Northwest National Laboratory, University of North Dakota, and National Aeronautics and Space Administration found that the lifetime of midlatitude convective systems lasting less than six hours is mainly attributable to the intensity of the initial convection. Systems lasting longer than six hours were associated with up to 50 percent higher mid-tropospheric relative humidity and up to 40 percent stronger middle to upper tropospheric wind shear. This resulted in continuous growth of the stratiform rain area, prolonging the system's lifetime. The team used statistical analysis of satellite, ground radar, and reanalysis datasets to study these deep convective systems consisting of intense convective cores, large stratiform rain regions, and extensive non-precipitating anvil clouds. This study focused on the factors that affect system lifetime and anvil cloud production, with important implications for the impact of these cloud systems on Earth's radiation budget. An automated satellite tracking method was used in conjunction with a recently developed multisensor classification to analyze the evolution of convective system structure in a Lagrangian framework over the central United States. Regression analysis showed that anvil cloud areal coverage is strongly correlated with the size of the convective core, updraft strength, and stratiform rain area. Upper tropospheric wind speed and wind shear also play an important role for convective anvil cloud production. This research provides insight into the variety of factors that affect the life cycle of convective systems.

Reference: Feng, Z., X. Dong, B. Xi, S. A. McFarlane, A. Kennedy, B. Lin, and P. Minnis. 2013. "Life Cycle of Midlatitude Deep Convective Systems in a Lagrangian Framework," Journal of Geophysical Research-Atmospheres 117, D23201. DOI: 10.1029/2012JD018362. (Reference link)

Contact: Ashley Williamson, SC-23.1, (301) 903-3120, Sally McFarlane, SC-23.1, (301) 903-0943
Topic Areas:

  • Research Area: Atmospheric System Research

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

Aug 24, 2019
New Approach for Studying How Microbes Influence Their Environment
A diverse group of scientists suggests a common framework and targeting of known microbial processes [more...]

Aug 08, 2019
Nutrient-Hungry Peatland Microbes Reduce Carbon Loss Under Warmer Conditions
Enzyme production in peatlands reduces carbon lost to respiration under future high temperatures. [more...]

Aug 05, 2019
Amazon Forest Response to CO2 Fertilization Dependent on Plant Phosphorus Acquisition
AmazonFACE Model Intercomparison. The Science Plant growth is dependent on the availabi [more...]

Jul 29, 2019
A Slippery Slope: Soil Carbon Destabilization
Carbon gain or loss depends on the balance between competing biological, chemical, and physical reac [more...]

Jul 15, 2019
Field Evaluation of Gas Analyzers for Measuring Ecosystem Fluxes
How gas analyzer type and correction method impact measured fluxes. The Science A side- [more...]

List all highlights (possible long download time)