User:Robertinventor/Simple animals could live in Martian brines - Extended Interview with planetary scientist Vlada Stamenković: Difference between revisions
User:Robertinventor/Simple animals could live in Martian brines - Extended Interview with planetary scientist Vlada Stamenković (edit)
Revision as of 19:16, 23 September 2019
, 4 years ago→Technical details - guide to paper
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The main points in their research are summarized in their [https://www.nature.com/articles/s41561-018-0243-0/figures/3 figure 3] which shows two versions of the map, with and without supercooling. The upper figure is the one with supercooling (note the colour-coding is different for the two maps). The map is for calcium perchlorates and they explain that results are comparable for magnesium perchlorates. The dotted lines in that diagram show the polar limit for sponges. The paper says that 6.5% of the surface area of Mars could have oxygen concentrations suitable for primitive sponges. The white and purple colored regions close to the poles are regions that could have oxygen solubilities similar to Earth's oceans, and the paper says that the polar regions have ''"the greatest potential to harbor near-surface fluids "'' at 0.2 moles per cubic meter of dissolved oxygen (6.4 mg / liter). The lowest concentration in their model for their best estimate with supercooling is ~2.5 × 10<sup>−5</sup> moles per cubic meter of dissolved oxygen in the tropical southern highlands (0.0008 mg per liter<!--https://www.google.com/search?q=2.5*32*10^-5-->).
Techy aside here, Wikinews asked him about what seems to be a dicrepancy beween Figure 2a and Figure 3.
:: {{WNIQ|Wikinews}} The paper itself mentions a lower limit of 2.5 * 10-5 moles per cubic meter. But in Figure 2a it looks more like 1.<something> for the lower limit for both the magnesium and calcium suphates. Wondered which is right, or am I misunderstanding something and there is no discrepancy?
::'''VS''': Fig 2 is for an average pressure Pav and Temperature T and Pressure P not being correlated (at a point x on the surface P and T are correlated). Correlated (P,T) are used for Fig 3. Note that the lower limit for perchlorates in Fig 3 is larger than in Fig 2, for correlated (P,T) it is also larger for the other brines, and around lower limit of 2.5 * 10-5 moles per cubic meter.
For the effects of the different types of brine, see their [https://www.nature.com/articles/s41561-018-0243-0/figures/2 figure 2]2. This is the one that covers the sodium perchlorate and magnesium perchlorate figures. The brines are colour coded as in [https://www.nature.com/articles/s41561-018-0243-0/figures/1 figure 1], so sodium perchlorate is black, and Magnesium perchlorate is pink. The lowest number in the abstract of 2.5 millionths of a mole per cubic meter is for the sodium perchlorate black bar in figure 2e. The highest figure of 2 moles per cubic meter is for the magnesium perchnlorates pink bar in figure 2a.
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