Mysteries of the Last Ice Age - Full Documentary
- 2 years ago
In a race against developers in the Rocky Mountains, archaeologists uncover a unique fossil site packed with astonishingly well-preserved bones of mammoths, mastodons, and other giant extinct beasts. The discovery opens a highly focused window on the vanished world of the Ice Age in North America. - During construction in Colorado, a bulldozer dug up a tooth so huge it had to be held in two hands revealing intimate secrets of the life and death of North Americas most exotic and extreme creatures. Most tantalizing of all, the team unearths startling and controversial evidence of what may be the earliest humans ever to venture into the untamed wilderness of Ice Age America.
Mystery Of What Triggered The Last Ice Age May Have Been Solved - Two mysteries have been a head-scratcher for many paleoclimate experts: Where did the last ice age's ice sheets come from, and how did they grow so fast? A new study published in Nature Geoscience may have solved these mysteries, proposing an explanation. These findings could also be applied to other historic glacial periods.
The last glacial cycle began 116,000 years ago, and an enormous ice sheet covered the Northern Hemisphere. However, these sheets only took 10,000 years to grow and merge, which was surprising to scientists.
Scientists have previously struggled to explain the extensive ice sheets that covered the milder Northern Europe and Scandinavia – the warm water brought up by the North Atlantic Current should have made Scandinavia largely ice-free.
"The problem is we don't know where those ice sheets (in Scandinavia) came from and what caused them to expand in such a short amount of time," said Marcus Lofverstrom, lead author, in a statement.
The authors of the study developed a complex Earth-system model called the Community Earth System Model. This model could recreate early climate conditions from the recent glacial period in high spatial detail
The researchers found that ocean gateways in the Canadian Arctic Archipelago were vital in controlling the North Atlantic climate. This gateway then helped decide whether the ice sheets in Scandinavia grew or not. The models revealed that as long as the Canadian Arctic Archipelago remained open, the Northern Hemisphere was cooled sufficiently enough by the Earth’s orbital configuration to allow ice sheets to build up in Northern Canada and Siberia.
The research team also explored whether the marine ice sheets obstructed the waterways in the Canadian Arctic Archipelago. Normally, fresh Arctic and North Pacific waster is routed through the Canadian Arctic Archipelago – in this scenario, it was actually diverted east of Greenland. The diversion caused weakening and freshening of the North Atlantic deep circulation, cooler conditions in Scandinavia, and sea ice expansion.
Mystery Of What Triggered The Last Ice Age May Have Been Solved - Two mysteries have been a head-scratcher for many paleoclimate experts: Where did the last ice age's ice sheets come from, and how did they grow so fast? A new study published in Nature Geoscience may have solved these mysteries, proposing an explanation. These findings could also be applied to other historic glacial periods.
The last glacial cycle began 116,000 years ago, and an enormous ice sheet covered the Northern Hemisphere. However, these sheets only took 10,000 years to grow and merge, which was surprising to scientists.
Scientists have previously struggled to explain the extensive ice sheets that covered the milder Northern Europe and Scandinavia – the warm water brought up by the North Atlantic Current should have made Scandinavia largely ice-free.
"The problem is we don't know where those ice sheets (in Scandinavia) came from and what caused them to expand in such a short amount of time," said Marcus Lofverstrom, lead author, in a statement.
The authors of the study developed a complex Earth-system model called the Community Earth System Model. This model could recreate early climate conditions from the recent glacial period in high spatial detail
The researchers found that ocean gateways in the Canadian Arctic Archipelago were vital in controlling the North Atlantic climate. This gateway then helped decide whether the ice sheets in Scandinavia grew or not. The models revealed that as long as the Canadian Arctic Archipelago remained open, the Northern Hemisphere was cooled sufficiently enough by the Earth’s orbital configuration to allow ice sheets to build up in Northern Canada and Siberia.
The research team also explored whether the marine ice sheets obstructed the waterways in the Canadian Arctic Archipelago. Normally, fresh Arctic and North Pacific waster is routed through the Canadian Arctic Archipelago – in this scenario, it was actually diverted east of Greenland. The diversion caused weakening and freshening of the North Atlantic deep circulation, cooler conditions in Scandinavia, and sea ice expansion.