Air pressure at bottom of valles marineris

[CaptainOrso]

<p>Greetings:</p><p>&nbsp; We know the surface air pressure&nbsp; on Mars is about 8 MillBars.&nbsp; Do we have any idea what it would be at the lowest point in the martian canyon?&nbsp; i.e. high enough to support liquid water&nbsp; based on a high salt/silt content?</p><p>Thank you. </p>

 

[aphh]

<p>I don't have actual numbers, but if Mars' 1% athmospheric pressure on ground level is equivalent to air pressure at 30KM altitude on Earth, the VM being 7KM deep at max. the pressure has to be considerably higher down there.</p><p>The floor of the canyon would also offer some protection against radiation, especially Ultra Violet.&nbsp;</p><p>&nbsp;</p>

 

[baulten]

The Hellas Planitia crater could house liquid water for short periods of time.&nbsp; I'm not sure about the bottom of Valles Marineris.<br />

 

[crazyeddie]

<p><BR/>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>The Hellas Planitia crater could house liquid water for short periods of time.&nbsp; I'm not sure about the bottom of Valles Marineris. <br /> Posted by baulten</DIV></p><p><span style="font-family:Arial;font-size:12px" class="Apple-style-span"><span style="font-style:italic" class="Apple-style-span">Although the Hellas Impact Crater usually receives all of the credit for being the lowest point on Mars, the honor actually should go to a younger and much smaller impact crater located deep within the Hellas Impact Crater. It is marked in the image above by a red flag. The asteroid that produced this crater blasted through the floor of the Hellas Crater to produce the lowest elevation on Mars.</span></span><span style="font-style:italic" class="Apple-style-span">&nbsp;</span></p><p>http://geology.com/articles/highest-point-on-mars.shtml</p> <div class="Discussion_UserSignature"> </div>

 

[schmack]

Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>Although the Hellas Impact Crater usually receives all of the credit for being the lowest point on Mars, the honor actually should go to a younger and much smaller impact crater located deep within the Hellas Impact Crater. It is marked in the image above by a red flag. The asteroid that produced this crater blasted through the floor of the Hellas Crater to produce the lowest elevation on Mars.&nbsp;http://geology.com/articles/highest-point-on-mars.shtml <br />Posted by crazyeddie</DIV><br /><br />Thanks for posting that Eddie. Thats an interesting map. <div class="Discussion_UserSignature"> <p><font size="4" color="#ff0000"><font size="2">Assumption is the mother of all stuff ups</font> </font></p><p><font size="4" color="#ff0000">Gimme some Schmack Schmack!</font></p> </div>

 

[3488]

<p><BR/>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'><font color="#ff0000">Thanks for posting that Eddie. Thats an interesting map. <br />Posted by schmack</font></DIV></p><p><strong><font size="2">It is indeed.</font></strong></p><p><strong><font size="2">That dark blue area showing the very lowest evelations in northern Hellas Is also known as Coronae Scopulus. The highest point on Mars is on the S W rim of the caldera of Olympus Mons @ 21,229 metres, where the atmospheric pressure is approx 0.6 of one millibar..</font></strong></p><p><strong><font size="2">Lowest point in Coronae Scopulus is 8,200 metres, a difference of 29,429 metres or 96,551 feet.</font></strong></p><p><strong><font size="2">Andrew Brown.</font></strong></p> <div class="Discussion_UserSignature"> <p><font color="#000080">"I suddenly noticed an anomaly to the left of Io, just off the rim of that world. It was extremely large with respect to the overall size of Io and crescent shaped. It seemed unbelievable that something that big had not been visible before".</font> <em><strong><font color="#000000">Linda Morabito </font></strong><font color="#800000">on discovering that the Jupiter moon Io was volcanically active. Friday 9th March 1979.</font></em></p><p><font size="1" color="#000080">http://www.launchphotography.com/</font><br /><br /><font size="1" color="#000080">http://anthmartian.googlepages.com/thisislandearth</font></p><p><font size="1" color="#000080">http://web.me.com/meridianijournal</font></p> </div>