Re: Supercooled liquid water can occur in clouds below 0 degrees C.
From: Phred (ppnerkDELETETHIS_at_yahoo.com)
Date: 08/01/04
- Next message: I R A Darth Aggie: "Re: "'Fahrenheit 9/11' showed me the truth and compelled me to do what I can to stop the killing of innocent people," she said."
- Previous message: Courageous: "Re: "'Fahrenheit 9/11' showed me the truth and compelled me to do what I can to stop the killing of innocent people," she said."
- In reply to: Rodney Blackall: "Re: Supercooled liquid water can occur in clouds below 0 degrees C."
- Next in thread: Rodney Blackall: "Re: Supercooled liquid water can occur in clouds below 0 degrees C."
- Reply: Rodney Blackall: "Re: Supercooled liquid water can occur in clouds below 0 degrees C."
- Messages sorted by: [ date ] [ thread ]
Date: Sun, 01 Aug 2004 14:15:44 GMT
In article <4cd74dcfffrblackall@rodsrisc.demon.co.uk>,
Rodney Blackall <rblackall@rodsrisc.demon.co.uk> wrote:
>In article <832ea96d.0407300553.47a231b7@posting.google.com>,
> Robert Clark <rgregoryclark@yahoo.com> wrote:
>
>> I'm wondering if these low level fogs are ice crystals instead of
>> liquid water droplets why are they occurring in low level locations?
>> A low altitude site would make sense for *liquid* water on Mars since
>> that would provide a higher atmospheric pressure. But you would think
>> that ice crystals could form at any atmospheric pressure.
>
>Fog / cloud will form when the atmosphere becomes saturated with respect
>to water / ice.
>
>H2O conc. will be greatest near the surface normally.
>
>The coldest atmosphere will either be high up or near the night-time
>surface.
>
>If condensation occurs at temps. >0 deg C then you get water fog.
>If condensation occurs at temps. < - 40 deg C then you get ice fog.
G'day Rodney,
I'm curious about this -40C stuff. Is there actually some physical
phase change or whatever involved here, or is it just a convenient
rule of thumb not to be taken too literally?
>If condensation occurs at temperatures between 0 & -40 then water fog will
>form on 'ordinary' condensation nuclei and ice fog around 'ice'
>condensation nuclei; I doubt we know which is commonest on Mars.
>
>In a mixed fog ice will grow at the expense of water and the resulting
>larger crystals gradually settle out (often with interesting optical
>phenomena).
Cheers, Phred.
-- ppnerkDELETE@THISyahoo.com.INVALID
- Next message: I R A Darth Aggie: "Re: "'Fahrenheit 9/11' showed me the truth and compelled me to do what I can to stop the killing of innocent people," she said."
- Previous message: Courageous: "Re: "'Fahrenheit 9/11' showed me the truth and compelled me to do what I can to stop the killing of innocent people," she said."
- In reply to: Rodney Blackall: "Re: Supercooled liquid water can occur in clouds below 0 degrees C."
- Next in thread: Rodney Blackall: "Re: Supercooled liquid water can occur in clouds below 0 degrees C."
- Reply: Rodney Blackall: "Re: Supercooled liquid water can occur in clouds below 0 degrees C."
- Messages sorted by: [ date ] [ thread ]
Relevant Pages
|
