title: H2O at the Phoenix landing site.
abstract: The Phoenix mission investigated patterned ground and weather in the northern arctic region of Mars for 5 months starting 25 May 2008 (solar longitude between 76.5 degrees and 148 degrees ). A shallow ice table was uncovered by the robotic arm in the center and edge of a nearby polygon at depths of 5 to 18 centimeters. In late summer, snowfall and frost blanketed the surface at night; H(2)O ice and vapor constantly interacted with the soil. The soil was alkaline (pH = 7.7) and contained CaCO(3), aqueous minerals, and salts up to several weight percent in the indurated surface soil. Their formation likely required the presence of water.
authors: Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, USA. psmith@lpl.arizona.edu
authors: P H
authors: PH
authors: Smith
authors: L K
authors: LK
authors: Tamppari
authors: R E
authors: RE
authors: Arvidson
authors: D
authors: D
authors: Bass
authors: D
authors: D
authors: Blaney
authors: W V
authors: WV
authors: Boynton
authors: A
authors: A
authors: Carswell
authors: D C
authors: DC
authors: Catling
authors: B C
authors: BC
authors: Clark
authors: T
authors: T
authors: Duck
authors: E
authors: E
authors: Dejong
authors: D
authors: D
authors: Fisher
authors: W
authors: W
authors: Goetz
authors: H P
authors: HP
authors: Gunnlaugsson
authors: M H
authors: MH
authors: Hecht
authors: V
authors: V
authors: Hipkin
authors: J
authors: J
authors: Hoffman
authors: S F
authors: SF
authors: Hviid
authors: H U
authors: HU
authors: Keller
authors: S P
authors: SP
authors: Kounaves
authors: C F
authors: CF
authors: Lange
authors: M T
authors: MT
authors: Lemmon
authors: M B
authors: MB
authors: Madsen
authors: W J
authors: WJ
authors: Markiewicz
authors: J
authors: J
authors: Marshall
authors: C P
authors: CP
authors: McKay
authors: M T
authors: MT
authors: Mellon
authors: D W
authors: DW
authors: Ming
authors: R V
authors: RV
authors: Morris
authors: W T
authors: WT
authors: Pike
authors: N
authors: N
authors: Renno
authors: U
authors: U
authors: Staufer
authors: C
authors: C
authors: Stoker
authors: P
authors: P
authors: Taylor
authors: J A
authors: JA
authors: Whiteway
authors: A P
authors: AP
authors: Zent
mesh_terms: D002119:Calcium Carbonate; D005118:Extraterrestrial Environment; D006863:Hydrogen-Ion Concentration; D007053:Ice; D018535:Mars; D012371:Robotics; D018531:Spacecraft; D013696:Temperature; D014867:Water
chemical_list: D007053:Ice; D014867:Water; D002119:Calcium Carbonate