| Literature DB >> 12040090 |
W V Boynton1, W C Feldman, S W Squyres, T H Prettyman, J Bruckner, L G Evans, R C Reedy, R Starr, J R Arnold, D M Drake, P A J Englert, A E Metzger, Igor Mitrofanov, J I Trombka, C D'Uston, H Wanke, O Gasnault, D K Hamara, D M Janes, R L Marcialis, S Maurice, I Mikheeva, G J Taylor, R Tokar, C Shinohara.
Abstract
Using the Gamma-Ray Spectrometer on the Mars Odyssey, we have identified two regions near the poles that are enriched in hydrogen. The data indicate the presence of a subsurface layer enriched in hydrogen overlain by a hydrogen-poor layer. The thickness of the upper layer decreases with decreasing distance to the pole, ranging from a column density of about 150 grams per square centimeter at -42 degrees latitude to about 40 grams per square centimeter at -77 degrees. The hydrogen-rich regions correlate with regions of predicted ice stability. We suggest that the host of the hydrogen in the subsurface layer is ice, which constitutes 35 +/- 15% of the layer by weight.Entities:
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Year: 2002 PMID： 12040090 DOI： 10.1126/science.1073722
Source DB: PubMed Journal: Science ISSN： 0036-8075 Impact factor: 47.728