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Erdal Yiğit's Research
Erdal Yiğit's Research
Main Research Interests
Main Research Interests
Waves and dynamics in planetary atmospheres and ionospheres
Whole atmosphere coupling
Space weather
General circulation modeling
Satellite observations of planetary atmospheres
News
News
I have joined the editorial board of the Frontiers in Astronomy and Space Sciences.
I wrote a contribution on the connection between Martian global dust storms, gravity waves, and water escape in IAGA's blog
https://iaga-aiga.blogspot.com/2022/01/on-connection-between-martian-global.html
My perspective article on the connection between Martian global dust storms, atmospheric gravity waves, and Martian water escape has been published in Science on 10 December 2021:
Waves and Dynamics in Terrestrial and Planetary Atmospheres
Waves and Dynamics in Terrestrial and Planetary Atmospheres
Characterization of Earth's upper atmosphere using satellites
Satellites provide powerful measurements technique to characterize the thermal and dynamical structure of the thermosphere and ionosphere system. NASA's ICON satellite observes the temperature and winds in great detail in Earth's thermosphere as seen in the right panel as an example (Yiğit et al. 2022, JGR-Space). Here, data are binned appropriately at three different altitudes in the thermosphere to produce a climatology of winds, meaning that we can get an idea of the average zonal and meridional winds.
Gravity waves in planetary atmospheres
Internal gravity (buoyancy) waves are present in all planetary atmospheres studied in the Solar System. They are produced in the lower atmosphere and can propagate into the upper atmosphere. General circulation models have coarse grid resolution so they have to include gravity wave parameterizations. I have developed a whole atmosphere gravity wave parameterization, which represents the propagation and dissipation of gravity waves in the entire atmosphere. On the right (1/1) gravity wave signatures are seen in clouds as captured in Fairfax Virginia in November 2013.
"Obscure waves in planetary atmosphere"
A review paper on atmospheric gravity waves in planetary atmospheres has been on the cover page of Physics Today, June 2019 issue. On Earth and on other planets, internal gravity waves shape the dynamics and thermodynamics of the atmosphere (Yiğit and Medvedev, 2019).
Gravity waves in Mars atmosphere
Gravity wave sources on Mars are stronger than on Earth. Martian GWs dominate the mean and variable structure of the whole atmosphere system. Martian general circulation models using the whole atmosphere gravity wave parameterization have predicted pronounced GW momentum deposition in the Martian lower thermosphere (Medvedev et al., 2011)
Whole Atmosphere Coupling
Whole Atmosphere Coupling
I am interested in the coupling between the different atmospheric layers from the troposphere to the thermosphere-ionosphere
General circulation modeling
General circulation modeling
I work with three-dimensional general circulation models of Mars and Earth to study vertical coupling between the lower and upper atmosphere
Some Past Projects
Some Past Projects
CEDAR: Vertical Coupling in the Atmosphere-Ionosphere System by Gravity Waves, National Science Foundation, PI, 2015-2019.
Understanding the Role of Waves and Tides in Regulating Venus’ Highly Variable Upper Atmosphere Circulation (~70 – 170 km), NASA, Co-I, 2015-2019.
Analysis of nighttime limb IR CO2 and OH emissions from the mesosphere and lower thermosphere measured by SABER/TIMED, NASA, PI, 2016-2018.
Auswirkungen des geomagnetischen Feldes auf die vertikale Kopplung durch Schwerewellen in der Thermosphäre/Ionosphäre, Deutsche Forschungsgesellschaft (DFG), Kooperationspartner (Collaborator), 2015-present
Using MAVEN to characterize Mars upper atmosphere variability and its connection to the lower atmosphere, NASA, Co-I, 2014-2017.
Untersuchung der vertikalen Kopplung durch Schwerewellen in der Marsatmosphäre, Deutsche Forschungsgesellschaft (DFG), Beteiligte Person (Co-I), 2013-2016.
Some Highlights and Media
Some Highlights and Media
Satellite data helps Mason physicist study gravity waves in Mars' upper atmosphere , News at Mason, 2016.
Students as Scholar Research Assistant Highlights, George Mason University, 2015, USA.
Erdal Yiğit - Highlight on Young Scientist, University of Michigan, 2011
Past Events
Past Events
American Geophysical Union, Washington DC -- SA42A: Progress in Whole Atmosphere Coupling Studies
Oral: Thursday, 13 December 2018, 10:20-12:20 Convention Ctr - 202B
Posters: Friday, 14 December 2018, 8:00-12:20 Convention Ctr - Hall A-C (Poster Hall)
My abstracts:
P43K-3906 Comparing MAVEN/NGIMS Thermospheric Wind Observations with M-GITM Simulations
SA42A-08 Variation of small scale gravity wave activity in the ionosphere during a major sudden stratospheric warming event of 2009
SA51B-2730 Climatology of gravity wave activity in the middle atmosphere as simulated by a whole atmosphere gravity wave parameterization in a GCM and as observed by SABER/TIMED.
MARS
MARS
"MARS is a service of Mason Publishing and the Digital Scholarship Center at the George Mason University Libraries. Home of the Electronic Theses and Dissertations, as well as faculty research publications and data files, MARS provides access to the intellectual work of the Mason community". Some of my research data are available via the MARS.
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