planet four: studying the seasonal processes on the polar regions of mars meg schwamb asiaa
TRANSCRIPT
![Page 1: Planet Four: Studying the Seasonal Processes on the Polar Regions of Mars Meg Schwamb ASIAA](https://reader034.vdocuments.site/reader034/viewer/2022051517/5697c0281a28abf838cd6db0/html5/thumbnails/1.jpg)
Planet Four: Studying the Seasonal Processes on the Polar Regions of Mars
Meg SchwambASIAA
![Page 2: Planet Four: Studying the Seasonal Processes on the Polar Regions of Mars Meg Schwamb ASIAA](https://reader034.vdocuments.site/reader034/viewer/2022051517/5697c0281a28abf838cd6db0/html5/thumbnails/2.jpg)
Each Winter 30% of Mars’ atmosphere
freezes out at the poles to form a
seasonal ice cap
![Page 3: Planet Four: Studying the Seasonal Processes on the Polar Regions of Mars Meg Schwamb ASIAA](https://reader034.vdocuments.site/reader034/viewer/2022051517/5697c0281a28abf838cd6db0/html5/thumbnails/3.jpg)
At the South Pole of Mars, the seasonal carbon dioxide ice cap is directly exposed to the atmosphere
and thaws in the Spring and Summer
![Page 4: Planet Four: Studying the Seasonal Processes on the Polar Regions of Mars Meg Schwamb ASIAA](https://reader034.vdocuments.site/reader034/viewer/2022051517/5697c0281a28abf838cd6db0/html5/thumbnails/4.jpg)
Mars Reconnaissance Orbiter with the HiRISE camera
Image credit: NASA/JPL/University of Arizona
![Page 5: Planet Four: Studying the Seasonal Processes on the Polar Regions of Mars Meg Schwamb ASIAA](https://reader034.vdocuments.site/reader034/viewer/2022051517/5697c0281a28abf838cd6db0/html5/thumbnails/5.jpg)
HiRISE images show dark fans and blotches on the South Pole in Spring and Early
Summer
Image credit: NASA/JPL/University of Arizona
![Page 6: Planet Four: Studying the Seasonal Processes on the Polar Regions of Mars Meg Schwamb ASIAA](https://reader034.vdocuments.site/reader034/viewer/2022051517/5697c0281a28abf838cd6db0/html5/thumbnails/6.jpg)
Image credit: NASA/JPL/University of Arizona
![Page 7: Planet Four: Studying the Seasonal Processes on the Polar Regions of Mars Meg Schwamb ASIAA](https://reader034.vdocuments.site/reader034/viewer/2022051517/5697c0281a28abf838cd6db0/html5/thumbnails/7.jpg)
Image credit: NASA/JPL/University of Arizona
![Page 8: Planet Four: Studying the Seasonal Processes on the Polar Regions of Mars Meg Schwamb ASIAA](https://reader034.vdocuments.site/reader034/viewer/2022051517/5697c0281a28abf838cd6db0/html5/thumbnails/8.jpg)
HiRISE images capture dark fans & blotches on the South Pole in Spring & Summer
Image credit: NASA/JPL/University of Arizona
![Page 9: Planet Four: Studying the Seasonal Processes on the Polar Regions of Mars Meg Schwamb ASIAA](https://reader034.vdocuments.site/reader034/viewer/2022051517/5697c0281a28abf838cd6db0/html5/thumbnails/9.jpg)
Kieffer et al. , 2006
Hansen & McEwen, 2007
Fans & blotches blend into the ground when the ice has
disappeared
Carbon dioxide gas breaks out in geysers
The Sun heats and sublimates the base of the carbon dioxide ice
sheet. The carbon dioxide gas is trapped below
![Page 10: Planet Four: Studying the Seasonal Processes on the Polar Regions of Mars Meg Schwamb ASIAA](https://reader034.vdocuments.site/reader034/viewer/2022051517/5697c0281a28abf838cd6db0/html5/thumbnails/10.jpg)
Carbon dioxide geysers bring dust and dirt to the ice sheet surface. Local winds
blow the particles into dark fans
Image credit: Arizona State University/Ron Miller
![Page 11: Planet Four: Studying the Seasonal Processes on the Polar Regions of Mars Meg Schwamb ASIAA](https://reader034.vdocuments.site/reader034/viewer/2022051517/5697c0281a28abf838cd6db0/html5/thumbnails/11.jpg)
Over many seasons, carbon dioxide gas trapped below the ice over carves in the ground dendrite-like channels
dubbed ‘spiders’ and araneiform terrain
Image credit: NASA/JPL/
University of Arizona
![Page 12: Planet Four: Studying the Seasonal Processes on the Polar Regions of Mars Meg Schwamb ASIAA](https://reader034.vdocuments.site/reader034/viewer/2022051517/5697c0281a28abf838cd6db0/html5/thumbnails/12.jpg)
Kieffer et al. , 2006
Hansen & McEwen, 2007
Fans & blotches blend into the ground when the ice has
disappeared
The Sun heats and sublimates the base of the carbon dioxide ice sheet.
The carbon dioxide gas is trapped below
Carbon dioxide gas breaks out in geysers
![Page 13: Planet Four: Studying the Seasonal Processes on the Polar Regions of Mars Meg Schwamb ASIAA](https://reader034.vdocuments.site/reader034/viewer/2022051517/5697c0281a28abf838cd6db0/html5/thumbnails/13.jpg)
These seasonal features can help us create a surface wind map of the South Pole
Wind No Wind
Image credit: NASA/JPL/University of Arizona
![Page 14: Planet Four: Studying the Seasonal Processes on the Polar Regions of Mars Meg Schwamb ASIAA](https://reader034.vdocuments.site/reader034/viewer/2022051517/5697c0281a28abf838cd6db0/html5/thumbnails/14.jpg)
We want to understand how these seasonal blotches and fans evolve over time and change
from different regions on the South Pole.
Animation Credit: Anya Portyankina Image credit: NASA/JPL/University of Arizona
![Page 15: Planet Four: Studying the Seasonal Processes on the Polar Regions of Mars Meg Schwamb ASIAA](https://reader034.vdocuments.site/reader034/viewer/2022051517/5697c0281a28abf838cd6db0/html5/thumbnails/15.jpg)
How does the South Pole change from Winter to Winter?
A global dust storm occurred on Mars between the two winters - how does this impact the number and size of
seasonal fans and blotches?
Image credit: NASA/JPL/University of Arizona
![Page 16: Planet Four: Studying the Seasonal Processes on the Polar Regions of Mars Meg Schwamb ASIAA](https://reader034.vdocuments.site/reader034/viewer/2022051517/5697c0281a28abf838cd6db0/html5/thumbnails/16.jpg)
Planet Four
http://www.planetfour.org?lang=zh_tw
![Page 17: Planet Four: Studying the Seasonal Processes on the Polar Regions of Mars Meg Schwamb ASIAA](https://reader034.vdocuments.site/reader034/viewer/2022051517/5697c0281a28abf838cd6db0/html5/thumbnails/17.jpg)
Planet Four
http://www.planetfour.org?lang=zh_tw
![Page 18: Planet Four: Studying the Seasonal Processes on the Polar Regions of Mars Meg Schwamb ASIAA](https://reader034.vdocuments.site/reader034/viewer/2022051517/5697c0281a28abf838cd6db0/html5/thumbnails/18.jpg)
Planet Four
http://www.planetfour.org?lang=zh_tw