کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8138982 | 1523561 | 2014 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Transient climate effects of large impacts on Titan
ترجمه فارسی عنوان
اثرات آب و هوایی گذار از تاثیرات بزرگ بر روی تیتان
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کلمات کلیدی
تیتان، تیتان، هیدرولوژی، تیتان، اتمسفر، فرآیندهای تاثیر گذار،
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم فضا و نجوم
چکیده انگلیسی
Titan's thick atmosphere and volatile-rich surface cause it to respond to big impacts in a somewhat Earth-like manner. Here we construct a simple globally-averaged model that tracks the flow of energy through the environment in the weeks, years, and millenia after a big comet strikes Titan. The model Titan is endowed with 1.4 bars of N2 and 0.07 bars of CH4, methane lakes, a water ice crust, and enough methane underground to saturate the regolith to the surface. We find that a nominal Menrva impact is big enough to raise the surface temperature by â¼80Â K and to double the amount of methane in the atmosphere. The extra methane drizzles out of the atmosphere over hundreds of years. An upper-limit Menrva is just big enough to raise the surface to water's melting point. The putative Hotei impact (a possible 800-1200Â km diameter basin, Soderblom et al., 2009) is big enough to raise the surface temperature to 350-400Â K. Water rain must fall and global meltwaters might range between 50Â m to more than a kilometer deep, depending on the size of the event and how rapidly bedrock ice warms and founders. Global meltwater oceans do not last more than a few decades or centuries at most, but are interesting to consider given Titan's organic wealth. Significant near-surface clathrate formation is possible as Titan cools but faces major kinetic barriers.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Icarus - Volume 229, February 2014, Pages 378-391
Journal: Icarus - Volume 229, February 2014, Pages 378-391
نویسندگان
Kevin J. Zahnle, Donald G. Korycansky, Conor A. Nixon,