کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8135011 | 1523515 | 2016 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Titan's missing ethane: From the atmosphere to the subsurface
ترجمه فارسی عنوان
اتان از دست رفته تیتان: از جو به زیر زمین
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کلمات کلیدی
تیتان، اتمسفر، تیتان، سطح، اتمسفر، شیمی، شیمی پربیوتیک،
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم فضا و نجوم
چکیده انگلیسی
The second most abundant component of the present-day Titan atmosphere, methane (CH4), is known to undergo photolytic conversion to ethane (C2H6) that accumulates as a liquid on Titan's surface. Condensation temperature of ethane is higher than that of methane, so that ethane “rain” may be expected to occur before the liquefaction of methane. At present, the partial pressure of ethane in the atmosphere is 1Eâ5Â bar, much lower than 1Eâ1Â bar of CH4. Estimated 8.46E17Â kg or 1.37E6Â km3 of C2H6 have been produced on Titan since accretion. The Titan surface reservoirs of ethane are lakes and craters, of estimated volume of 50,000Â km3 and 61,000Â km3, respectively. As these are smaller than the total volume of liquid ethane produced in the course of Titan's history, the excess may be stored in the subsurface of the crust, made primarily of water ice. The minimum porosity of the crust needed to accommodate all the liquid ethane would be only 0.9% of the uppermost 2Â km of the crust. The occurrence of CH4 and liquid C2H6 on Titan has led to much speculation on the possibility of life on that satellite. The aggregation of organic molecules in a “primordial soup or bullion” depends in part on the viscosity of the medium, diffusivity of organic molecules in it, and rates of polymerization reactions. The temperatures on Titan, much lower than on primordial Earth, are less favorable to the “Second Coming of life” on Titan.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Icarus - Volume 275, 1 September 2016, Pages 252-258
Journal: Icarus - Volume 275, 1 September 2016, Pages 252-258
نویسندگان
Ashley E. Gilliam, Abraham Lerman,