EAS206 Lecture Notes - Lecture 13: Patterned Ground, Hirise, Compact Reconnaissance Imaging Spectrometer For Mars
30 Apr 2018
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• Mars Odyssey
o Objectives
o Instruments
▪ THEMIS
• Better resolution than TES
• Fill in intermediates and get better mineral signatures
▪ GRS
• Water = H2O (looking at the hydrogen part of the water here)
• Current Climate
o Atmospheric Temperature
o Water ice clouds
o Daytime temperature
• Is liquid water stable?
o O Mas, e do’t hit the liuid poit due to the pessue (fo . to
millibars)
▪ Amount of water in the atmosphere is low because it is dominated by
CO2
▪ Low pressure = only solid or gas
▪ Orange circle = Mars regime (conditions in which it is stable)
o Hydrological Cycle
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▪ The closer you get to the surface, the colder you get
▪ As soon as the ground ice is exposed to the atmosphere, it sublimates
• Ground ice: periodically, ground ice is released, and adds to the
vapour in the atmosphere. This vapour makes its way to the
poles, and gets frozen in
• At the poles: the ice at the poles sublimates in summer and that
vapour travels to the colder pole (which is in winter)
• At the surface: There is frost that precipitates and sublimates
due to daily changes in temperature
o Ground ice – patterned ground
o Water Map
▪ Water is mixed in at the high latitudes
▪ Top ~ 1m
▪ Purple-blue = 50% of water mixed in with the soil (around 50o)
▪ Equators have high amounts of minerals possibly containing lots of
hydrogen (not necessarily
water in these areas)
o Ground ice
o Polar caps
▪ Caps 4 – 6 km thick
▪ Seasonal cap
• Comes and goes with
the seasons
▪ Residual cap
• Always present
▪ North
• Spiral pattern (wind
patterns – polar
vortex) slide 26
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
Instruments: themis, better resolution than tes, fill in intermediates and get better mineral signatures, grs, water = h2o (looking at the hydrogen part of the water here, current climate, atmospheric temperature, water ice clouds, daytime temperature. Is liquid water stable: o(cid:374) ma(cid:396)s, (cid:449)e do(cid:374)"t hit the li(cid:395)uid poi(cid:374)t due to the p(cid:396)essu(cid:396)e (f(cid:396)o(cid:373) (cid:1004). (cid:1005) to (cid:1005) millibars, amount of water in the atmosphere is low because it is dominated by. Ground ice: periodically, ground ice is released, and adds to the vapour in the atmosphere. Cap: both caps are have a residual cap of water ice. The (cid:374)orther(cid:374) cap has (cid:373)ore of a spiral patter(cid:374). The souther(cid:374) cap"s residual cap is topped off by carbon dioxide ice (because that cap is colder). It"s possible that so(cid:373)e of the (cid:449)ate(cid:396) i(cid:374) ma(cid:396)s is slightly salty: flowing water and briny water is the most likely, the mars reconnaissance orbiter explanation, objectives.
