47th Lunar and Planetary Science Conference (2016)
Monday, March 21, 2016
MARS ATMOSPHERE: HERE TODAY, GONE TOMORROW
8:30 a.m. Waterway Ballroom 6
sess104.pdf
[M104]
Chairs:
Melissa Trainer
Stephen Wood
8:30 a.m.
Lillis R. J. * Jakosky B. M. Luhmann J. G. Grebowsky J. Brain D. A.
Scientific Highlights from the MAVEN Mission to Mars [#1170]
We present new discoveries from the first 15 months of the MAVEN mission, including an update on
atmospheric escape rates from Mars.
9:00 a.m.
Slipski M. * Jakosky B. M. Alsaeed N. Mahaffy P. R. Benna M. et al.
Characterizing Mars’ Atmospheric Loss Through Argon Isotopic Fractionation Observed
with MAVEN [#2422]
Atmosphere once thick / Mars’ isotopes suggest / Some gases Argon.
9:15 a.m.
Kurokawa H. * Kurosawa K. Usui T.
A Lower Limit of Atmospheric Pressure on Early Mars Inferred from Nitrogen and
Argon Isotopes [#1220]
Comparing model calculations of the atmospheric evolution with isotope data of trapped gas in ALH
84001 gave a lower limit of the atmospheric pressure at 4.1 Ga.
9:30 a.m.
Thiemann E. M. B. * Chaffin M. S. Bhattacharyya D. Clarke J. T.
Density Retrievals of the Mars Hydrogen Exosphere from MAVEN Solar
Lyman-Alpha Occultations [#2353]
MAVEN EUVM solar occultations are used to find absolute density retrievals of the Mars H exosphere
spanning the first year of the MAVEN mission.
9:45 a.m.
Crismani M. M. J. * Schneider N. M. Jain S. Plane J. Carrillo-Sanchez J. D. et al.
Meteoric Metal Layer in Mars’ Atmosphere: Steady-State Flux and Meteor Showers [#2791]
Mars metal ions / In the upper atmosphere / Meteor showers.
10:00 a.m.
Lo D. Y. * Yelle R. V. Schneider N. M. Jain S. K. Stewart A. I. F. et al.
Twilight Limb Observations of Aerosols in the Martian Atmosphere by MAVEN IUVS [#2603]
We make use of a single-scattering model to investigate aerosol scattering of sunlight observed by
MAVEN IUVS in the nightside atmospheric limb.
10:15 a.m.
Wood S. E. * Phillips R. J. Smith I. B. Putzig N. E. Bierson C. J.
Modeling the Recent Evolution of Mars Perennial CO2 Caps and Atmospheric Mass [#3074]
Seasonally-resolved modeling of the martian CO2 cycle over the past 400 kyr produces several
>100-m-thick layers of perennial CO2 ice at the south pole.
10:30 a.m.
Wilson J. T. * Eke V. R. Massey R. J. Elphic R. C. Feldman W. C. et al.
Seasonal Variation of the Martian Polar CO2 Caps in GCM Predictions and Mars Odyssey Neutron
Spectrometer Data [#2908]
We examine seasonal variation in the polar CO2 caps using a set of reconstructions based on MONS data
and find disagreement with the predictions of the GCMs.
10:45 a.m.
Brown A. J. * Calvin W. M. Becerra P. Byrne S.
The Martian North Polar Water Cycle [#1753]
Using CRISM observations of H2O ice deposition on the martian NPRC, we found latitude-dependent
‘mode flips’ and quantified the total amount of water deposited.
47th Lunar and Planetary Science Conference (2016)
sess104.pdf
11:00 a.m.
Villanueva G. L. * Mumma M. J. Novak R. E.
Unidentified Chemistry on Mars? Strong Tests of Current Photochemical Models via Global Mapping of
Water and Ozone (Sampled via O2 Dayglow) [#1158]
We report maps of ozone and water on Mars, revealing a strong dependence on local orography. Could
this be the signature of heterogeneous chemistry?
11:15 a.m.
Fries M. * Christou A. Archer D. Conrad P. Cooke W. et al.
Martian Methane from a Cometary Source: A Hypothesis [#2932]
There’s methane on Mars / Why focus on a ground source? / The sky is there too.
11:30 a.m.
Roos M. * Atreya S. K. Webster C. R. Mahaffy P. R.
Cometary Origin of Methane on Mars Highly Unlikely [#1159]
Atmospheric methane measurements by SAM/MSL do not show a correlation with predicted meteor
shower events on Mars, which are a possible source of methane.