PDA

View Full Version : Mars may be emerging from an ice age



ToSeek
2003-Dec-18, 05:20 PM
Mars may be emerging from an ice age (http://www.spaceflightnow.com/news/n0312/17icymars/)

Global warming on Mars?

Diamond
2003-Dec-22, 10:53 AM
Mars may be emerging from an ice age (http://www.spaceflightnow.com/news/n0312/17icymars/)

Global warming on Mars?

We already know that in the time that Mars Global Surveyor has been looking at Mars, the polar ice caps are showing signs of melting.

This change must be a response to solar forcing, which is unsurprising since the Sun appears to be stronger than it has been for at least 1000 years.

See http://www.aip.org/enews/physnews/2003/split/658-2.html and especially http://www.newscientist.com/news/news.jsp?id=ns99994321

PeteB
2003-Dec-22, 12:00 PM
This change must be a response to solar forcing, which is unsurprising since the Sun appears to be stronger than it has been for at least 1000 years.

Another factor might be that the obliquity of of the rotation axis is changing. It's thought to vary between 15 and 35 deg over ~50-60,000 years, with longer term excursions up to 0 and 60 deg. I recently asked someone who knows about Mars' orbital dynamics whether obiquity changes can be detected and he said that it would take monitoring a signal from a fixed location on the surface for about 10 years to begin to do so.