Форумы Серверы Суспільство
Игры Серверы VBIOS General Soft & Hard Увлечения А поговорить... Культура Полезная информация Межигір'я Чат

Пользователь Сообщение: Global Warming        (Тема#71496)
KillMachine UA 
генералиссимус
KillMachine UA
Возраст: 39
: Київ
С нами с 10.12.07
Посты: 25376
13.03.13 10:51 Ukraine #1542404
  • цитата:

Global temperatures are close to 11,000-year peak

Planet is set to get hotter than at any time since last ice age by end of century.


Sid Perkins, Nature


Global average temperatures are now higher than they have been for about 75% of the past 11,300 years, a study suggests. And if climate models are any indication, by the end of this century they will be the highest ever since the end of the most recent ice age.


Earth's temperatures (here seen by an infrared sensor on the NASA satellite Aqua).



Instrumental records of climate extend back to only the late nineteenth century. Beyond that, scientists depend on analyses of natural chronicles such as tree rings and isotope ratios in cave formations.

But even these archives have their limits: many detailed reconstructions of climate, particularly of temperature, apply to only limited regions or extend back at most a couple of millennia, says Shaun Marcott, a climate scientist at Oregon State University in Corvallis.

Marcott and his colleagues set about reconstructing global climate trends all the way back to 11,300 years ago, when the Northern Hemisphere was emerging from the most recent ice age. To do so, they collected and analysed data gathered by other teams. The 73 overlapping climate records that they considered included sediment cores drilled from lake bottoms and sea floors around the world, along with a handful of ice cores collected in Antarctica and Greenland.

Each of these chronicles spanned at least 6,500 years, and each included a millennium-long baseline period beginning in the middle of the post-ice-age period at 3550 bc.

For some records, the researchers inferred past temperatures from the ratio of magnesium and calcium ions in the shells of microscopic creatures that had died and dropped to the ocean floor; for others, they measured the lengths of long-chain organic molecules called alkenones that were trapped in the sediments.

After the ice age, they found, global average temperatures rose until they reached a plateau between 7550 and 3550 bc. Then a long-term cooling trend set in, reaching its lowest temperature extreme between ad 1450 and 1850.

Since then, temperatures have been increasing at a dramatic clip: from the first decade of the twentieth century to now, global average temperatures rose from near their coldest point since the ice age to nearly their warmest, Marcott and his team report today in Science.


Climate context
The temperature trends that the team identified for the past 2,000 years are statistically indistinguishable from results obtained by other researchers in a previous study, says Marcott. “That gives us confidence that the rest of our record is right too,” he adds.

Marcott and his colleagues “have put together a pretty impressive set of climate proxies”, says Gavin Schmidt, a climate scientist at the NASA Goddard Institute for Space Studies in New York. “The overall climate picture has been clear for a long time, mostly from the Northern Hemisphere, but this compilation really puts the rest of the world in context,” he adds.

“Prior to this study, researchers could only guess whether global temperatures had exceeded the warmest part of the present interglacial period,” says Darrell Kaufman, a geologist at Northern Arizona University in Flagstaff. The latest findings show that the recent high temperatures are not necessarily the warmest, but they are unusually high, he notes.

The temperature trends during most of the post-ice-age period match those expected from natural factors such as the long-term variation in the tilt of Earth’s axis, says Marcott. But in the past century and a half, industrial emissions of the greenhouse gas carbon dioxide have increased — which helps to explain why global temperatures have risen so quickly in recent decades, he suggests.

Climate models from the Intergovernmental Panel on Climate Change suggest that by the end of this century, regardless of future carbon dioxide emissions, temperatures will be at their highest since the end of the most recent ice age, the researchers say.




Прикрепления: temperatures.jpg (217.23 KB) 81 Просмотр(ы)

Silent Dude 
голос разума
Silent Dude
: Paradise
С нами с 18.02.10
Посты: 32700
13.03.13 10:53 [Re: KillMachine UA] Ukraine #1542407
Why is it so cold then ?
KillMachine UA 
генералиссимус
KillMachine UA
Возраст: 39
: Київ
С нами с 10.12.07
Посты: 25376
13.03.13 11:01 [Re: Silent Dude] Ukraine #1542415
Wait a couple of months until the summer, and ask this question again then.
TiggyWiggs 
grrrr
TiggyWiggs
С нами с 08.02.01
Посты: 6762
13.03.13 14:21 [Re: KillMachine UA] United States #1542585
For many reasons, modern scientists prefer to use the term "climate change" rather than "global warming". Global warming, occuring mainly as the result of the release of GHG into the atmosphere, however, remains the main underlying factor of current changes in climat.
Icon Legend Права Настройки темы
Распечатать тему


568 Просмотры
Реклама
210 сейчас в онлайне
8 пользователей (6APMALEU, MAXVBIOS, Lam0, monkey55, CybeReХ, artyom-310608, Drumace) и 1 скрытых, а также 201 гостей сейчас онлайн.
     
VBIOS Version 3.0 FINAL | ©1999-2020
Execution time: 0.091 seconds.   Total Queries: 32   Zlib сжатие вкл.
All times are (GMT+2.0). Current time is 11:25
Top