Timeline for What instruments and techniques measured Mars' atmospheric D/H ratio which suggests (all of) it's water didn't evaporate after all?
Current License: CC BY-SA 4.0
24 events
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| S Mar 4, 2023 at 2:12 | history | bounty ended | uhoh | ||
| S Mar 4, 2023 at 2:12 | history | notice removed | uhoh | ||
| Mar 3, 2023 at 15:51 | history | edited | Cornelis | CC BY-SA 4.0 |
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| Mar 3, 2023 at 13:37 | comment | added | Cornelis | @uhoh I don't want to hide my comments from the public and I can't help it that you obviously don't want to understand what I'm writing. | |
| Mar 3, 2023 at 11:10 | comment | added | uhoh | @Cornelis Again, this question is not about what you want to talk about, it's about where the surface water disappeared to. My question mentions a D/H ratio measurement yes, but it does not ask about the thing you keep mentioning. This is the last time I'll say "okay let's put this to rest please, or move it to chat". I'll just flag for moderator attention next time. | |
| Mar 3, 2023 at 10:38 | comment | added | Cornelis | @uhoh It's the use of the word "evaporate" in the title of your question that I question. Evaporation and subsequent condensation were part of the daily water cycle on Mars. It was not evaporation that changed the D/H ratio, it was the escape of hydrogen from the dissociation of water into space. | |
| Mar 3, 2023 at 10:04 | comment | added | Cornelis | @AtmosphericPrisonEscape You're right, photoevaporation is totally different from just evaporation by the warming of water. | |
| Mar 2, 2023 at 17:05 | comment | added | AtmosphericPrisonEscape | @Cornelis What, do you want me to quote the entire atmospheric escape literature at you? Here we go, ui.adsabs.harvard.edu/abs/2016ApJ...817..107O/abstract e.g. Photoevaporation, a process via which cold gas is heated and accelerated to escape velocity is ubiquitous in protoplanetary discs and hot exoplanets. | |
| Mar 2, 2023 at 14:43 | comment | added | uhoh | @Cornelis okay let's put this to rest please, or move it to chat. Please reread the end of my question. "That means that much of the planet’s water never escaped, and the only other place it could have gone was into the soil and rocks." My question is about where the surface water went - did it all evaporate to the atmosphere or go underground. The question isn't about what happens post evaporation it's only about how much evaporated. | |
| Mar 2, 2023 at 13:31 | comment | added | Cornelis | @ErinAnne And if with "evaporate" in the text of the question is meant "escape to space", then it's not water evaporating, but deuterium. | |
| Mar 2, 2023 at 12:18 | comment | added | Cornelis | @ErinAnne "water didn't evaporate" is just a wrong phrasing in this context, it should be "water didn't escape to space. Also, from the abstract: "Between 30 and 99% of martian water was sequestered through crustal hydration", so it is more likely that 2/3 was sequestered and 1/3 of the water escaped to space , certainly not that all of it did not evaporate or escaped to space. | |
| Mar 2, 2023 at 11:56 | comment | added | Cornelis | @AtmosphericPrisonEscape The definition of evaporation is "the process of a liquid converting to the gaseous state". On Mars, evaporation would be from the surface into the atmosphere, not directly into space. Give us only one example of a scientific article in which your assertion is showed. | |
| Mar 1, 2023 at 1:12 | comment | added | AtmosphericPrisonEscape | @Cornelis: Atmospheric escape to space is often loosely referred to as evaporation. | |
| Feb 27, 2023 at 0:14 | comment | added | Erin Anne | my two cents: a lot of uhoh's questions have some loose/colloquial phrasing or whatever, but it's almost always clear in context (as it is here, since the source quote is right next to it). Rephrasing that short paragraph might be "more correct" but it won't make the question more clear or more answerable, because it was already clear and answerable. I wouldn't change it. | |
| Feb 26, 2023 at 21:27 | comment | added | uhoh | @Cornelis that might be what I meant, but maybe not. I need to have my morning coffee first; after two or three brain cells kick-in I'll dig back into this (written three years ago). I might have just been referring to where the surface liquid water went - did it evaporate into the atmosphere or go underground, and might not have been asking what happened to the vapor subsequent to evaporation. I'm not sure the "escape to space" step is part of what I'm asking about | |
| Feb 26, 2023 at 15:32 | comment | added | Cornelis | In the primordial Mars atmosphere there was a lot of evaporation ! Didn't you mean escape to space instead of evaporation ? And the article that you cited says that much of the water never escaped, not all of it. | |
| Feb 26, 2023 at 4:25 | comment | added | TheMatrix Equation-balance | On the other hand, Distribution of water on Earth Glaciers and other ice: 2.15 percent ------------- Groundwater: 0.61 percent | |
| Feb 26, 2023 at 4:25 | comment | added | TheMatrix Equation-balance | I did not quite understand the initial suggestion: "That Mars' water may not have all evaporated but instead "gone underground". If Earth is a valid comparison to Mars, then, "gone underground" needs to be clarified. On Earth there is more water locked in rocks than in the surface oceans. "The high water storage capacity of minerals in Earth’s mantle transition zone (410- to 660-kilometer depth) implies the possibility of a deep H2O reservoir" science.org/doi/abs/10.1126/science.1253358 | |
| Feb 26, 2023 at 3:53 | history | edited | uhoh | CC BY-SA 4.0 |
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| Feb 26, 2023 at 2:47 | answer | added | Erin Anne | timeline score: 5 | |
| S Feb 26, 2023 at 0:07 | history | bounty started | uhoh | ||
| S Feb 26, 2023 at 0:07 | history | notice added | uhoh | Draw attention | |
| Mar 17, 2021 at 0:25 | history | edited | uhoh | CC BY-SA 4.0 |
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| Mar 17, 2021 at 0:07 | history | asked | uhoh | CC BY-SA 4.0 |