Ice Ages: Introduction to their Profound Impact on Planet Earth.
-
Upload
irma-norton -
Category
Documents
-
view
237 -
download
2
Transcript of Ice Ages: Introduction to their Profound Impact on Planet Earth.
![Page 1: Ice Ages: Introduction to their Profound Impact on Planet Earth.](https://reader036.fdocuments.net/reader036/viewer/2022062422/56649eb15503460f94bb6cf7/html5/thumbnails/1.jpg)
Ice Ages: Introduction to their Profound Impact on Planet
Earth
![Page 2: Ice Ages: Introduction to their Profound Impact on Planet Earth.](https://reader036.fdocuments.net/reader036/viewer/2022062422/56649eb15503460f94bb6cf7/html5/thumbnails/2.jpg)
Glaciers
1. Climatic Setting Ice Ages
2. Indirect Effects of Glaciers
![Page 3: Ice Ages: Introduction to their Profound Impact on Planet Earth.](https://reader036.fdocuments.net/reader036/viewer/2022062422/56649eb15503460f94bb6cf7/html5/thumbnails/3.jpg)
1. Climatic Setting of Glaciers
Colder
Warmer
![Page 4: Ice Ages: Introduction to their Profound Impact on Planet Earth.](https://reader036.fdocuments.net/reader036/viewer/2022062422/56649eb15503460f94bb6cf7/html5/thumbnails/4.jpg)
Gradual Cooling into
the Pleistocene - cause under
debate
![Page 5: Ice Ages: Introduction to their Profound Impact on Planet Earth.](https://reader036.fdocuments.net/reader036/viewer/2022062422/56649eb15503460f94bb6cf7/html5/thumbnails/5.jpg)
In the Pleistocene
![Page 6: Ice Ages: Introduction to their Profound Impact on Planet Earth.](https://reader036.fdocuments.net/reader036/viewer/2022062422/56649eb15503460f94bb6cf7/html5/thumbnails/6.jpg)
![Page 7: Ice Ages: Introduction to their Profound Impact on Planet Earth.](https://reader036.fdocuments.net/reader036/viewer/2022062422/56649eb15503460f94bb6cf7/html5/thumbnails/7.jpg)
Varves
![Page 8: Ice Ages: Introduction to their Profound Impact on Planet Earth.](https://reader036.fdocuments.net/reader036/viewer/2022062422/56649eb15503460f94bb6cf7/html5/thumbnails/8.jpg)
![Page 9: Ice Ages: Introduction to their Profound Impact on Planet Earth.](https://reader036.fdocuments.net/reader036/viewer/2022062422/56649eb15503460f94bb6cf7/html5/thumbnails/9.jpg)
![Page 10: Ice Ages: Introduction to their Profound Impact on Planet Earth.](https://reader036.fdocuments.net/reader036/viewer/2022062422/56649eb15503460f94bb6cf7/html5/thumbnails/10.jpg)
![Page 11: Ice Ages: Introduction to their Profound Impact on Planet Earth.](https://reader036.fdocuments.net/reader036/viewer/2022062422/56649eb15503460f94bb6cf7/html5/thumbnails/11.jpg)
![Page 12: Ice Ages: Introduction to their Profound Impact on Planet Earth.](https://reader036.fdocuments.net/reader036/viewer/2022062422/56649eb15503460f94bb6cf7/html5/thumbnails/12.jpg)
![Page 13: Ice Ages: Introduction to their Profound Impact on Planet Earth.](https://reader036.fdocuments.net/reader036/viewer/2022062422/56649eb15503460f94bb6cf7/html5/thumbnails/13.jpg)
But in last few centuries, changes in solar output caused the Little Ice
Age and warming up since
![Page 14: Ice Ages: Introduction to their Profound Impact on Planet Earth.](https://reader036.fdocuments.net/reader036/viewer/2022062422/56649eb15503460f94bb6cf7/html5/thumbnails/14.jpg)
Is it natural warming from the Little Ice
Age? Or human-caused global
warming?
Explored later in this class
![Page 15: Ice Ages: Introduction to their Profound Impact on Planet Earth.](https://reader036.fdocuments.net/reader036/viewer/2022062422/56649eb15503460f94bb6cf7/html5/thumbnails/15.jpg)
2. Indirect Effects of Glaciers
![Page 16: Ice Ages: Introduction to their Profound Impact on Planet Earth.](https://reader036.fdocuments.net/reader036/viewer/2022062422/56649eb15503460f94bb6cf7/html5/thumbnails/16.jpg)
Water moves backand forth between
glaciers and oceans
![Page 17: Ice Ages: Introduction to their Profound Impact on Planet Earth.](https://reader036.fdocuments.net/reader036/viewer/2022062422/56649eb15503460f94bb6cf7/html5/thumbnails/17.jpg)
![Page 18: Ice Ages: Introduction to their Profound Impact on Planet Earth.](https://reader036.fdocuments.net/reader036/viewer/2022062422/56649eb15503460f94bb6cf7/html5/thumbnails/18.jpg)
• “Noah’s Flood” hypothesis
• William Ryan & Walter Pittman (Columbia
• Controversial, not universally accepted, but intriguing
![Page 19: Ice Ages: Introduction to their Profound Impact on Planet Earth.](https://reader036.fdocuments.net/reader036/viewer/2022062422/56649eb15503460f94bb6cf7/html5/thumbnails/19.jpg)
• Coming out of last ice age ~7600 years ago (=5600 B.C.), sea level was low but rising– Why?
• Black Sea was freshwater, surrounded by farms
![Page 20: Ice Ages: Introduction to their Profound Impact on Planet Earth.](https://reader036.fdocuments.net/reader036/viewer/2022062422/56649eb15503460f94bb6cf7/html5/thumbnails/20.jpg)
Noah’s Flood?• Rising global sea level raised
Mediterranean above the Bosporus Strait– Broke through natural dam– Water rose ~6 inches / day– Flooded lakeshore communities
![Page 21: Ice Ages: Introduction to their Profound Impact on Planet Earth.](https://reader036.fdocuments.net/reader036/viewer/2022062422/56649eb15503460f94bb6cf7/html5/thumbnails/21.jpg)
some of the evidence
• Many cultures have a flood story, many can be traced to the Black Sea area
• Remains of houses & villages have been found on the pre-flood lakeshore
• But: New work finds no evidence for a sudden rise in water level of Black Sea.
![Page 22: Ice Ages: Introduction to their Profound Impact on Planet Earth.](https://reader036.fdocuments.net/reader036/viewer/2022062422/56649eb15503460f94bb6cf7/html5/thumbnails/22.jpg)
2. Indirect Effects of Glaciers:glacial loess
![Page 23: Ice Ages: Introduction to their Profound Impact on Planet Earth.](https://reader036.fdocuments.net/reader036/viewer/2022062422/56649eb15503460f94bb6cf7/html5/thumbnails/23.jpg)
Loess in Alaska
![Page 24: Ice Ages: Introduction to their Profound Impact on Planet Earth.](https://reader036.fdocuments.net/reader036/viewer/2022062422/56649eb15503460f94bb6cf7/html5/thumbnails/24.jpg)
Loess in Alaska
![Page 25: Ice Ages: Introduction to their Profound Impact on Planet Earth.](https://reader036.fdocuments.net/reader036/viewer/2022062422/56649eb15503460f94bb6cf7/html5/thumbnails/25.jpg)
![Page 26: Ice Ages: Introduction to their Profound Impact on Planet Earth.](https://reader036.fdocuments.net/reader036/viewer/2022062422/56649eb15503460f94bb6cf7/html5/thumbnails/26.jpg)
![Page 27: Ice Ages: Introduction to their Profound Impact on Planet Earth.](https://reader036.fdocuments.net/reader036/viewer/2022062422/56649eb15503460f94bb6cf7/html5/thumbnails/27.jpg)
Loess Plateau, China
from glacial dust and
desert dust
![Page 28: Ice Ages: Introduction to their Profound Impact on Planet Earth.](https://reader036.fdocuments.net/reader036/viewer/2022062422/56649eb15503460f94bb6cf7/html5/thumbnails/28.jpg)
2. Indirect Effects of Glaciers:paleolakes from changes in
climate patterns
![Page 29: Ice Ages: Introduction to their Profound Impact on Planet Earth.](https://reader036.fdocuments.net/reader036/viewer/2022062422/56649eb15503460f94bb6cf7/html5/thumbnails/29.jpg)
2 shorelines of ancient lakes
![Page 30: Ice Ages: Introduction to their Profound Impact on Planet Earth.](https://reader036.fdocuments.net/reader036/viewer/2022062422/56649eb15503460f94bb6cf7/html5/thumbnails/30.jpg)
![Page 31: Ice Ages: Introduction to their Profound Impact on Planet Earth.](https://reader036.fdocuments.net/reader036/viewer/2022062422/56649eb15503460f94bb6cf7/html5/thumbnails/31.jpg)
2. Many more indirect effects!
![Page 32: Ice Ages: Introduction to their Profound Impact on Planet Earth.](https://reader036.fdocuments.net/reader036/viewer/2022062422/56649eb15503460f94bb6cf7/html5/thumbnails/32.jpg)