کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1781572 1523965 2011 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Measurement of the isotopic signatures of water on Mars; Implications for studying methane
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فیزیک زمین (ژئو فیزیک)
پیش نمایش صفحه اول مقاله
Measurement of the isotopic signatures of water on Mars; Implications for studying methane
چکیده انگلیسی

The recent discovery of methane on Mars has led to much discussion concerning its origin. On Earth, the isotopic signatures of methane vary with the nature of its production. Specifically, the ratios among 12CH4, 13CH4, and 12CH3D differ for biotic and abiotic origins. On Mars, measuring these ratios would provide insights into the origins of methane and measurements of water isotopologues co-released with methane would assist in testing their chemical relationship. Since 1997, we have been measuring HDO and H2O in Mars’ atmosphere and comparing their ratio to that in Earth’s oceans. We recently incorporated a line-by-line radiative transfer model (LBLRTM) into our analysis. Here, we present a map for [HDO]/[H2O] along the central meridian (154°W) for Ls=50°. From these results, we constructed models to determine the observational conditions needed to quantify the isotopic ratios of methane in Mars’ atmosphere. Current ground-based instruments lack the spectral resolution and sensitivity needed to make these measurements. Measurements of the isotopologues of methane will likely require in situ sampling.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Planetary and Space Science - Volume 59, Issues 2–3, February 2011, Pages 163–168
نویسندگان
, , ,