Seasonal polar carbon dioxide frost on Mars

CO2 mass and columnar thickness distribution

Nora J. Kelly, William V. Boynton, Kris E. Kerry, Dave Hamara, Daniel M. Janes, Robert C. Reddy, Kyeong J. Kim, Robert M. Haberle

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Conclusions are drawn about the column density (g/cm2), spatial extent, and mass of the seasonal carbon dioxide frost on the poles of Mars as a function of time utilizing data from the 2001 Mars Odyssey Gamma Ray Spectrometer (GRS). Quantification of these CO2 values is achieved by observing attenuation effects of the surface-emitted hydrogen gamma ray flux as the frost condenses and sublimates in a seasonal exchange of CO2 between the ground and the atmosphere. Columnar thickness and mass results are discussed and plotted for latitudes including ±60° and poleward. GRS observations are compared to predictions from the NASA Ames Research Center General Circulation Model and to similar experimental results from the Mars Odyssey High Energy Neutron Detector and Neutron Spectrometer. Models for north and south polar atmosphere and regolith distributions are incorporated, and our results indicate that the assumption of a 100% H2O-ice residual cap underlying the seasonal frost in the north is accurate. The GRS CO2 frost observations are in good agreement with the other studies mentioned, in particular for the timing of the beginning of frost deposition to the complete sublimation of surface CO2 back into the atmosphere. The total amount of condensed carbon dioxide mass seen by the GRS is on the order of 6.0 × 1015 kg and verifies previous reports that nearly 25% of the Martian CO2 reservoir participates in the ground-atmosphere exchange cycle.

Original languageEnglish (US)
Article numberE03S07
JournalJournal of Geophysical Research: Space Physics
Volume112
Issue number3
DOIs
StatePublished - Mar 20 2007

Fingerprint

Gamma ray spectrometers
frost
gamma ray spectrometers
Carbon Dioxide
mars
carbon dioxide
Mars
spectrometer
atmospheres
atmosphere
Neutron spectrometers
2001 Mars Odyssey
Neutron detectors
Mercuric Chloride
sublimate
Sublimation
Ice
neutron spectrometers
Gamma rays
regolith

ASJC Scopus subject areas

  • Oceanography
  • Astronomy and Astrophysics
  • Atmospheric Science
  • Space and Planetary Science
  • Earth and Planetary Sciences (miscellaneous)
  • Geophysics
  • Geochemistry and Petrology

Cite this

Seasonal polar carbon dioxide frost on Mars : CO2 mass and columnar thickness distribution. / Kelly, Nora J.; Boynton, William V.; Kerry, Kris E.; Hamara, Dave; Janes, Daniel M.; Reddy, Robert C.; Kim, Kyeong J.; Haberle, Robert M.

In: Journal of Geophysical Research: Space Physics, Vol. 112, No. 3, E03S07, 20.03.2007.

Research output: Contribution to journalArticle

Kelly, Nora J. ; Boynton, William V. ; Kerry, Kris E. ; Hamara, Dave ; Janes, Daniel M. ; Reddy, Robert C. ; Kim, Kyeong J. ; Haberle, Robert M. / Seasonal polar carbon dioxide frost on Mars : CO2 mass and columnar thickness distribution. In: Journal of Geophysical Research: Space Physics. 2007 ; Vol. 112, No. 3.
@article{b1c10cd834304d888dd752eed9d11d84,
title = "Seasonal polar carbon dioxide frost on Mars: CO2 mass and columnar thickness distribution",
abstract = "Conclusions are drawn about the column density (g/cm2), spatial extent, and mass of the seasonal carbon dioxide frost on the poles of Mars as a function of time utilizing data from the 2001 Mars Odyssey Gamma Ray Spectrometer (GRS). Quantification of these CO2 values is achieved by observing attenuation effects of the surface-emitted hydrogen gamma ray flux as the frost condenses and sublimates in a seasonal exchange of CO2 between the ground and the atmosphere. Columnar thickness and mass results are discussed and plotted for latitudes including ±60° and poleward. GRS observations are compared to predictions from the NASA Ames Research Center General Circulation Model and to similar experimental results from the Mars Odyssey High Energy Neutron Detector and Neutron Spectrometer. Models for north and south polar atmosphere and regolith distributions are incorporated, and our results indicate that the assumption of a 100{\%} H2O-ice residual cap underlying the seasonal frost in the north is accurate. The GRS CO2 frost observations are in good agreement with the other studies mentioned, in particular for the timing of the beginning of frost deposition to the complete sublimation of surface CO2 back into the atmosphere. The total amount of condensed carbon dioxide mass seen by the GRS is on the order of 6.0 × 1015 kg and verifies previous reports that nearly 25{\%} of the Martian CO2 reservoir participates in the ground-atmosphere exchange cycle.",
author = "Kelly, {Nora J.} and Boynton, {William V.} and Kerry, {Kris E.} and Dave Hamara and Janes, {Daniel M.} and Reddy, {Robert C.} and Kim, {Kyeong J.} and Haberle, {Robert M.}",
year = "2007",
month = "3",
day = "20",
doi = "10.1029/2006JE002678",
language = "English (US)",
volume = "112",
journal = "Journal of Geophysical Research: Space Physics",
issn = "2169-9380",
publisher = "Wiley-Blackwell",
number = "3",

}

TY - JOUR

T1 - Seasonal polar carbon dioxide frost on Mars

T2 - CO2 mass and columnar thickness distribution

AU - Kelly, Nora J.

AU - Boynton, William V.

AU - Kerry, Kris E.

AU - Hamara, Dave

AU - Janes, Daniel M.

AU - Reddy, Robert C.

AU - Kim, Kyeong J.

AU - Haberle, Robert M.

PY - 2007/3/20

Y1 - 2007/3/20

N2 - Conclusions are drawn about the column density (g/cm2), spatial extent, and mass of the seasonal carbon dioxide frost on the poles of Mars as a function of time utilizing data from the 2001 Mars Odyssey Gamma Ray Spectrometer (GRS). Quantification of these CO2 values is achieved by observing attenuation effects of the surface-emitted hydrogen gamma ray flux as the frost condenses and sublimates in a seasonal exchange of CO2 between the ground and the atmosphere. Columnar thickness and mass results are discussed and plotted for latitudes including ±60° and poleward. GRS observations are compared to predictions from the NASA Ames Research Center General Circulation Model and to similar experimental results from the Mars Odyssey High Energy Neutron Detector and Neutron Spectrometer. Models for north and south polar atmosphere and regolith distributions are incorporated, and our results indicate that the assumption of a 100% H2O-ice residual cap underlying the seasonal frost in the north is accurate. The GRS CO2 frost observations are in good agreement with the other studies mentioned, in particular for the timing of the beginning of frost deposition to the complete sublimation of surface CO2 back into the atmosphere. The total amount of condensed carbon dioxide mass seen by the GRS is on the order of 6.0 × 1015 kg and verifies previous reports that nearly 25% of the Martian CO2 reservoir participates in the ground-atmosphere exchange cycle.

AB - Conclusions are drawn about the column density (g/cm2), spatial extent, and mass of the seasonal carbon dioxide frost on the poles of Mars as a function of time utilizing data from the 2001 Mars Odyssey Gamma Ray Spectrometer (GRS). Quantification of these CO2 values is achieved by observing attenuation effects of the surface-emitted hydrogen gamma ray flux as the frost condenses and sublimates in a seasonal exchange of CO2 between the ground and the atmosphere. Columnar thickness and mass results are discussed and plotted for latitudes including ±60° and poleward. GRS observations are compared to predictions from the NASA Ames Research Center General Circulation Model and to similar experimental results from the Mars Odyssey High Energy Neutron Detector and Neutron Spectrometer. Models for north and south polar atmosphere and regolith distributions are incorporated, and our results indicate that the assumption of a 100% H2O-ice residual cap underlying the seasonal frost in the north is accurate. The GRS CO2 frost observations are in good agreement with the other studies mentioned, in particular for the timing of the beginning of frost deposition to the complete sublimation of surface CO2 back into the atmosphere. The total amount of condensed carbon dioxide mass seen by the GRS is on the order of 6.0 × 1015 kg and verifies previous reports that nearly 25% of the Martian CO2 reservoir participates in the ground-atmosphere exchange cycle.

UR - http://www.scopus.com/inward/record.url?scp=34249875385&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34249875385&partnerID=8YFLogxK

U2 - 10.1029/2006JE002678

DO - 10.1029/2006JE002678

M3 - Article

VL - 112

JO - Journal of Geophysical Research: Space Physics

JF - Journal of Geophysical Research: Space Physics

SN - 2169-9380

IS - 3

M1 - E03S07

ER -