Imaging Studies of Atmospheric Gravity Waves
Dr. Mike Taylor
Center for Atmospheric and Space Sciences
Utah State University
Ground-based remote sensing studies of the Earth’s upper atmospheric regions
provide a low-cost and reliable method for long-term measurements.
At mesospheric heights (~60-100 km) the atmospheric pressure and density
are lower than can be achieved in most vacuum systems yet this tenuous region
is home to a wealth of dynamical phenomena. In particular atmospheric
gravity waves, generated by thunderstorms, severe weather, and by strong
winds blowing over large mountain ranges (such as the Rockies), can propagate
upwards from their source regions into the mesosphere in only a few hours.
At heights above about 80 km these waves start to break (like ocean waves
as they reach the shore) and deposit their energy and momentum which has
a dramatic influence on the upper atmospheric circulation and the temperature
field. At Utah State University we have developed sensitive CCD
imaging systems to help characterize these gravity waves (and much larger-scale
tidal perturbations) using the naturally occurring nightglow emissions.
Currently we have cameras operating remotely in Utah, Hawaii, Antarctica
(and soon in Norway), to help study their global variability and dominant
source regions. This talk will introduce the topic of upper atmospheric
imaging with examples of our
current atmospheric gravity wave research.