Skip to Main Navigation. Each navigation link will open a list of sub navigation links.

Skip to Main Content

Apply to the University of Wyoming apply now

Global Resource Navigation

Visit Campus
Download UW Viewbook
Give to UW

Colloquium

Department of Atmospheric Science

Tues., Nov. 14, 3:10 pm, EN6085

Improving Longwave Radiative Transfer Models via Field Experiments and Its Impact on a GCM

Dr. David D. Turner

Earth System Research Laboratory / NOAA

Abstract

Radiation processes, such as the absorption of radiation by water vapor and clouds, must be parameterized accurately in global climate models (GCMs), as inaccurate radiation parameterizations can lead to large errors in GCM simulations.  One of the largest sources of uncertainties in these radiation parameterizations is the magnitude of the water vapor continuum absorption.  If the modeled continuum absorption is too strong or weak, then the model atmosphere will radiate at a different level in the vertical, which will impact the local vertical circulation and potentially the larger scale planetary circulation in the simulation.

This presentation will present a story about how ground-based spectral radiance observations were used to improve the water vapor continuum model in the far-infrared (wavelengths longer than 15 µm).  The radiation emitted in far-infrared portion of the spectrum is about 40% of the total outgoing longwave radiation (OLR) emitted by the planet.  Also, the absorption by water vapor in the far-infrared plays a critical role in the vertical heating of the atmosphere, which drives local vertical motions and impacts the planetary circulation.  The story starts with the basic radiometric observations themselves, the subsequent improvement of the water vapor continuum model, the use of submillimeter and far-infrared spectroscopic observations to evaluate the updated radiative transfer model in a new environment, and the demonstration of the impact of the improved model on a GCM simulation.


Share This Page:

Contact Us

University of Wyoming,

Atmospheric Science,

EN 6034

Dept. 3038

1000 E. University Ave.

Laramie, WY 82071

Phone: (307)766-3245

Email: geerts@uwyo.edu

1000 E. University Ave. Laramie, WY 82071
UW Operators (307) 766-1121 | Contact Us | Download Adobe Reader

Twitter Icon Youtube Icon Instagram Icon Facebook Icon

Accreditation | Emergency Preparedness | Employment at UW | Gainful Employment | Privacy Policy | Accessibility Accessibility information icon