title: Results from the Mars Global Surveyor Thermal Emission Spectrometer.
abstract: The Thermal Emission Spectrometer spectra of low albedo surface materials suggests that a four to one mixture of pyroxene to plagioclase, together with about a 35 percent dust component provides the best fit to the spectrum. Qualitative upper limits can be placed on the concentration of carbonates (<10 percent), olivine (<10 percent), clay minerals (<20 percent), and quartz (<5 percent) in the limited regions observed. Limb observations in the northern hemisphere reveal low-lying dust hazes and detached water-ice clouds at altitudes up to 55 kilometers. At an aerocentric longitude of 224 degrees a major dust storm developed in the Noachis Terra region. The south polar cap retreat was similar to that observed by Viking.
authors.affiliation: Arizona State University, Tempe, AZ 85287, USA. phil.christensen@asu.edu
authors.forename: P R
authors.initials: PR
authors.lastname: Christensen
authors.forename: D L
authors.initials: DL
authors.lastname: Anderson
authors.forename: S C
authors.initials: SC
authors.lastname: Chase
authors.forename: R T
authors.initials: RT
authors.lastname: Clancy
authors.forename: R N
authors.initials: RN
authors.lastname: Clark
authors.forename: B J
authors.initials: BJ
authors.lastname: Conrath
authors.forename: H H
authors.initials: HH
authors.lastname: Kieffer
authors.forename: R O
authors.initials: RO
authors.lastname: Kuzmin
authors.forename: M C
authors.initials: MC
authors.lastname: Malin
authors.forename: J C
authors.initials: JC
authors.lastname: Pearl
authors.forename: T L
authors.initials: TL
authors.lastname: Roush
authors.forename: M D
authors.initials: MD
authors.lastname: Smith
mesh_terms: D001272:Atmosphere; D002245:Carbon Dioxide; D002254:Carbonates; D005118:Extraterrestrial Environment; D007053:Ice; D058085:Iron Compounds; D017616:Magnesium Compounds; D018535:Mars; D008903:Minerals; D017640:Silicates; D018531:Spacecraft; D013057:Spectrum Analysis; D013696:Temperature; D014867:Water
chemical_list: D002254:Carbonates; D007053:Ice; D058085:Iron Compounds; D017616:Magnesium Compounds; D008903:Minerals; D017640:Silicates; D014867:Water; D002245:Carbon Dioxide; C034475:olivine