Who I Am
My name is Mary Urquhart (Kelly is my married name, but I don't use that name at work).
I'm a fifth-year graduate student in the Astrophysical, Planetary, and Atmospheric
Sciences department at the University of Colorado in Boulder. I already have my M.S.
degree and all I have left for my Ph.D. is my doctoral thesis. My job title is research
assistant. Basically, I get paid to do research in planetary science under the guidance
of a professor (my advisor). Most of the research I do involves computer modeling.
So what exactly is computer modeling? Well, first the scientist needs to understand
the processes involved in the problem he or she is trying to solve: the physics, the
chemistry and sometimes even the biology related to the problem. Next, the researcher
decides what the important processes are. Nature is far too complicated for anyone to
model all of the processes involved with a particular system, even with the very best
computers. The important processes are those that will make a significant impact on the
result of the model. Next, the researcher uses math to describe the processes
quantitatively, in a way that the computer can use. Then the scientist programs these
equations into a computer using any one of many computer languages. Once all of these
steps have been completed, the scientist has a model for how the system he or she wants
to study works. The scientist can then experiment with the system in a way similar to the
way he or she might experiment with a real system in a laboratory. Computer modeling is
especially useful for doing science on things that are too big, too small, too far away,
or take a long time to change and are therefore unsuited to laboratory work. I have just
described nearly all of planetary science, atmospheric science and astrophysics!
My Research
In the past, I have used computer modeling to do research involving the atmosphere of
Venus, the surface of the Moon, the possibility of an icy greenhouse on three of Jupiter's
largest moons, and the formation of the Moon. Currently I am beginning my thesis research
on the carbon dioxide cycle on Mars where water and volcanic heat have at some time come
into contact (a hydrothermal system). The geysers of Yellowstone National Park are part
of a hydrothermal system produced by ground water interacting with hot volcanic rock
underneath the park. Although the surface of Mars is quite dry today, much evidence
exists that water had flowed on the surface in the past. Mars is likely to have at least
some water today locked in a frozen layer mixed with the crust. Also Mars may have or
have had underground water similar to aquifers on the Earth. Mars, like the Earth also
has volcanos. None of the Martian volcanos are known to be presently active, and may not
have been for a very long time. Still, at one time in the past, water and volcanic heat
have likely interacted to produce hydrothermal systems. My research focuses on the
interaction between the hot water, rocks, gases in the atmosphere and gases released by
molten rock.
|