凤凰号着陆点的水

H2O at the Phoenix landing site.

作者信息

Smith P H, Tamppari L K, Arvidson R E, Bass D, Blaney D, Boynton W V, Carswell A, Catling D C, Clark B C, Duck T, Dejong E, Fisher D, Goetz W, Gunnlaugsson H P, Hecht M H, Hipkin V, Hoffman J, Hviid S F, Keller H U, Kounaves S P, Lange C F, Lemmon M T, Madsen M B, Markiewicz W J, Marshall J, McKay C P, Mellon M T, Ming D W, Morris R V, Pike W T, Renno N, Staufer U, Stoker C, Taylor P, Whiteway J A, Zent A P

机构信息

Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, USA.

出版信息

Science. 2009 Jul 3;325(5936):58-61. doi: 10.1126/science.1172339.

DOI:10.1126/science.1172339

PMID:19574383

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.

摘要

“凤凰”号任务于2008年5月25日开始（太阳经度在76.5度至148度之间），对火星北极地区的地面图案和天气进行了为期5个月的调查。在附近多边形区域的中心和边缘，机械臂在5至18厘米深处发现了一个浅冰表。夏末，夜间降雪和霜冻覆盖了表面；水冰和水汽不断与土壤相互作用。土壤呈碱性（pH = 7.7），在硬结的表层土壤中含有碳酸钙、水合矿物质和高达百分之几重量的盐分。它们的形成可能需要有水的存在。