d********f
发帖数: 43471 | 1 我老早就告诉你们了，现在的气候条件完全符合50-100年的小冰河开端期特征
Explosion in Antarctic sea ice levels may cause another ice age
Upside-down "rivers" of warm ocean water may be one of the causes of
Antarctica's ice shelves breaking up, leading to a rise in sea levels. But a
new study suggests an increase in sea ice may lead to a much more
devastating change in the Earth's climate — another ice age.
Using computer simulations, the research suggests that an increase in sea
ice could significantly alter the circulation of the ocean, ultimately
leading to a reverse greenhouse effect as carbon dioxide levels in the ocean
increase and levels in the air decrease.
“One key question in the field is still what caused the Earth to
periodically cycle in and out of ice ages,” University of Chicago professor
and the study's co-author, Malte Jansen, said in a statement. “We are
pretty confident that the carbon balance between the atmosphere and ocean
must have changed, but we don’t quite know how or why."
A new study by UChicago scientists show how an increase in Antarctic sea ice
could trigger a chain of events leading to an ice age. Image courtesy of
Yvonne Firing
A new study by UChicago scientists show how an increase in Antarctic sea ice
could trigger a chain of events leading to an ice age. Image courtesy of
Yvonne Firing
ANTARCTICA'S ICE SHEETS CONTAIN RADIOACTIVE CHLORINE GAS 60 YEARS AFTER
NUCLEAR TESTS, STUDY SAYS
The last major ice age ended at the end of the Pleistocene era, about 2.5
million years ago, as glaciers have periodically grown and then gotten
smaller. Researchers believe that changes to the Earth's orbit may be partly
responsible for some of the Earth's cooling, but additional factors have
likely played a part, Jensen added.
“The most plausible explanation is that there was some change in how carbon
was divided between the atmosphere and the ocean,” Jansen continued. “
There’s no shortage of ideas about how this happens, but it’s not quite
clear how they all fit together.”
Researchers also believe a mini-ice age may have occurred roughly 12,800
years ago. It likely stems from an asteroid impact that "rocked the Northern
Hemisphere" and led to the Younger Dryas climate event.
Jansen pointed out that the Southern Ocean around Antarctica "plays a key
role in ocean circulation" due to the deep waters in the region, leading it
to have "outsize[d] consequences."
“What this suggests is that it’s a feedback loop,” said the study's lead
author, Alice Marzocchi. “As the temperature drops, less carbon is released
into the atmosphere, which triggers more cooling.”
“What surprised me is how much of this increased storage can be attributed
to physical changes alone, with Antarctic sea-ice cover being the key player
,” Marzocchi added, noting that future study of the ocean and the role it
plays in the carbon cycle can help simulate "future environmental change.”
The research has been published in the scientific journal Nature Geoscience. | l***x
发帖数: 1761 | | r*********t
发帖数: 4911 | 3 是啊，只要地球气候不是一成不变，那么昨日变暖教，便可以是明日变冷教。
【在 l***x 的大作中提到】
: 没关系，不是改成气候异常了吗
| l*****u
发帖数: 1788 | 4 上一次小冰河是不是饿死过人啊。变冷比变暖可怕的多。 | d********f
发帖数: 43471 | 5 小冰河并非单纯变冷，小冰河早期主要是四季错乱，暖冬寒春，导致农业生产没法进行
。明末小冰河就是春天一下种就全冻死，年年绝收
【在 l*****u 的大作中提到】
: 上一次小冰河是不是饿死过人啊。变冷比变暖可怕的多。
| s**********u
发帖数: 2749 | | l*h
发帖数: 4124 | 7 只要有变化，今天晴天明天下雨，有人就会继续闹腾。
a
ocean
【在 d********f 的大作中提到】
: 我老早就告诉你们了，现在的气候条件完全符合50-100年的小冰河开端期特征
: Explosion in Antarctic sea ice levels may cause another ice age
: Upside-down "rivers" of warm ocean water may be one of the causes of
: Antarctica's ice shelves breaking up, leading to a rise in sea levels. But a
: new study suggests an increase in sea ice may lead to a much more
: devastating change in the Earth's climate — another ice age.
: Using computer simulations, the research suggests that an increase in sea
: ice could significantly alter the circulation of the ocean, ultimately
: leading to a reverse greenhouse effect as carbon dioxide levels in the ocean
: increase and levels in the air decrease.
| M*****l
发帖数: 4478 | | k**k
发帖数: 204 | 9 你丫懂不懂英文阿
原文哪里说现在“不是变暖”了？
“Upside-down "rivers" of warm ocean water may be one of the causes of
Antarctica's ice shelves breaking up”这句话煞笔川粪看得懂么
a
ocean
【在 d********f 的大作中提到】
: 我老早就告诉你们了，现在的气候条件完全符合50-100年的小冰河开端期特征
: Explosion in Antarctic sea ice levels may cause another ice age
: Upside-down "rivers" of warm ocean water may be one of the causes of
: Antarctica's ice shelves breaking up, leading to a rise in sea levels. But a
: new study suggests an increase in sea ice may lead to a much more
: devastating change in the Earth's climate — another ice age.
: Using computer simulations, the research suggests that an increase in sea
: ice could significantly alter the circulation of the ocean, ultimately
: leading to a reverse greenhouse effect as carbon dioxide levels in the ocean
: increase and levels in the air decrease.
| l***x
发帖数: 1761 | 10 懂不懂英文难说，你中文真需要重学
：你丫懂不懂英文阿
：原文哪里说现在“不是变暖”了？ | n*********e
发帖数: 25274 | 11 确实，北半球这几天越来越冷了，怎么回事？
只要温度有些变化，民主党人就有借口说是全球变暖。lol | k**k
发帖数: 204 | 12 别扯淡
你就说说哪里有“新证据表明现在不是变暖”？
不过川粪除了扯淡也不会别的了。。。
【在 l***x 的大作中提到】
: 懂不懂英文难说，你中文真需要重学
:
: ：你丫懂不懂英文阿
: ：原文哪里说现在“不是变暖”了？
|
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