IPB

Welcome Guest ( Log In | Register )

9 Pages V  « < 7 8 9  
Reply to this topicStart new topic
Water plumes over Europa
stevesliva
post Sep 7 2018, 12:44 PM
Post #121


Senior Member
****

Group: Members
Posts: 1347
Joined: 14-October 05
From: Vermont
Member No.: 530



QUOTE (HSchirmer @ Sep 6 2018, 07:27 PM) *
vertical ice-pipes


You mean like penitentes? Wikipedia calls them "almost a black body"
https://en.wikipedia.org/wiki/Penitente_(snow_formation)
Go to the top of the page
 
+Quote Post
HSchirmer
post Sep 7 2018, 06:08 PM
Post #122


Member
***

Group: Members
Posts: 335
Joined: 24-July 15
Member No.: 7619



QUOTE (stevesliva @ Sep 7 2018, 01:44 PM) *
You mean like penitentes? Wikipedia calls them "almost a black body"


Well, conceptually similar -
ice structures grow due to "phase change" as water forms ice and accumulates in areas with higher heat loss.
But penitenties are sublimation and radiative heat loss to the sky, while ice pipes are snowpack melting and conductive heat loss to the ground.

So, practically, think "upside down penitentes".

Found it- red aeolian dust changes how snowpacks melt-

the variation in ice column morphology between red and clean snow gives insight into how dust deposition events may affect the energy balance, subsequent melt, and meltwater flowpaths in snow covered areas

The movement of liquid water through the snowpack in “red” snow thus appears to be more uniform, decreasing the size of preferential flowpaths that give rise to ice columns.
Go to the top of the page
 
+Quote Post
rogelio
post Oct 9 2018, 12:41 PM
Post #123


Junior Member
**

Group: Members
Posts: 57
Joined: 25-December 05
From: Stevens Point, Wisconsin, USA
Member No.: 619



QUOTE (HSchirmer @ Sep 7 2018, 12:08 PM) *
Well, conceptually similar -
ice structures grow due to "phase change" as water forms ice and accumulates in areas with higher heat loss.
But penitenties are sublimation and radiative heat loss to the sky, while ice pipes are snowpack melting and conductive heat loss to the ground.

So, practically, think "upside down penitentes".

Found it- red aeolian dust changes how snowpacks melt-

the variation in ice column morphology between red and clean snow gives insight into how dust deposition events may affect the energy balance, subsequent melt, and meltwater flowpaths in snow covered areas

The movement of liquid water through the snowpack in “red” snow thus appears to be more uniform, decreasing the size of preferential flowpaths that give rise to ice columns.


Penitentes up to 15 m high, spaced 7.5 m apart at the equator? Challenging for a lander...

https://www.nature.com/articles/s41561-018-0235-0

Go to the top of the page
 
+Quote Post

9 Pages V  « < 7 8 9
Reply to this topicStart new topic

 



RSS Lo-Fi Version Time is now: 15th October 2018 - 07:49 PM
RULES AND GUIDELINES
Please read the Forum Rules and Guidelines before posting.

IMAGE COPYRIGHT
Images posted on UnmannedSpaceflight.com may be copyrighted. Do not reproduce without permission. Read here for further information on space images and copyright.

OPINIONS AND MODERATION
Opinions expressed on UnmannedSpaceflight.com are those of the individual posters and do not necessarily reflect the opinions of UnmannedSpaceflight.com or The Planetary Society. The all-volunteer UnmannedSpaceflight.com moderation team is wholly independent of The Planetary Society. The Planetary Society has no influence over decisions made by the UnmannedSpaceflight.com moderators.
SUPPORT THE FORUM
Unmannedspaceflight.com is a project of the Planetary Society and is funded by donations from visitors and members. Help keep this forum up and running by contributing here.