کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1781847 1022306 2010 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Sublimation kinetics of CO2 ice on Mars
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فیزیک زمین (ژئو فیزیک)
پیش نمایش صفحه اول مقاله
Sublimation kinetics of CO2 ice on Mars
چکیده انگلیسی
Dynamic models of the martian polar caps are in abundance, but most rely on the assumption that the rate of sublimation of CO2 ice can be calculated from heat transfer and lack experimental verification. We experimentally measured the sublimation rate of pure CO2 ice under simulated martian conditions as a test of this assumption, developed a model based on our experimental results, and compared our model's predictions with observations from several martian missions (MRO, MGS, Viking). We show that sun irradiance is the primary control for the sublimation of CO2 ice on the martian poles with the amount of radiation penetrating the surface being controlled by variations in the optical depth, ensuring the formation and sublimation of the seasonal cap. Our model confirmed by comparison of MGS-MOC and MRO-HiRISE images, separated by 2-3 martian years, shows that ∼0.4 m are currently being lost from the south perennial cap per martian year. At this rate, the ∼2.4-m-thick south CO2 perennial cap will disappear in about 6-7 martian years, unless a short-scale climatic cycle alters this rate of retreat.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Planetary and Space Science - Volume 58, Issue 5, April 2010, Pages 780-791
نویسندگان
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