Current News about global warming

Global warming erases centuries of ocean cooling
January 26, 2015 – 08:22 am

For centuries, the oceans steadily cooled mostly due to large and frequent volcanic eruptions with some of the most frigid conditions occurring in what is known as the Little Ice Age.

But that began to change in the 19th century, when humans started burning more fossil fuels and increasing greenhouse gases in the atmosphere. According to a study published Monday in the journal Nature Geoscience, manmade global warming ended a cooling trend that had lasted from 801 to 1800 A.D.

"Today, the Earth is warming about 20 times faster than it cooled during the past 1, 800 years, " said Michael Evans, second author of the study and an associate professor at the University of Maryland's Department of Geology and Earth System Science Interdisciplinary Center. "This study truly highlights the profound effects we are having on our climate today."

The study also highlights the importance of the oceans in understanding climate change.

Compared to the atmosphere, the oceans can absorb much more heat and trap it for longer periods of time. Thus, oceans have warmed as have temperatures on land, causing sea levels to rise and prompting warnings that this could cause widespread flooding in coastal cities worldwide.

To document the oceans' past cooling, scientists combined 57 previously published marine surface temperature reconstructions that cover all of the world's oceans, from near polar to tropical regions. The team compiled the data within 200-year brackets to observe long-term trends, and then compared the findings to land-based reconstructions, which revealed similar cooling trends.

To investigate the cause of the cooling trend, the researchers turned to climate models. They examined how sea-surface temperatures reacted to various "forcing" factors, such as changes in solar output, Earth's orbit, land use, volcanic activity and greenhouse gases.

Only volcanic events resulted in a cooling trend that matched the team's real-world observations.

"No matter how we divided the data set, the cooling trend stands out as a robust signal, " said lead author Helen McGregor, an Australian Research Council Future Fellow at the University of Wollongong in Australia.

You might also like
Is Global Warming a Myth?--Ecospot Current TV
Is Global Warming a Myth?--Ecospot Current TV
13 Misconceptions About Global Warming
13 Misconceptions About Global Warming
Popular Q&A
What is the latest news on global warming current and future? | Yahoo Answers

To the natives in the SOUTH PACIFIC ISLANDS that are almost UNDER WATER and to the Eskimos in Alaska who are about to lose their settlements to sea rise.. GLOBAL WARMING is VERY real and happening now.. REGARDLESS what the REPUBLICAN POLITICIANS and the BORN AGAINS WHO HATE SCIENCE would have you believe... GLOBAL WARMING in not just real, but it's ACCELERATING so the changes are even happening faster.. . but the REPUBLICAN POLITICIANS will be giving news conferences when they are knee deep in the waters of the Potomac and swearing that GLOBAL WARMING IN NOT REAL

What is the news on global warming?

2009 was the second hottest year on record. 2010 tied with 2005 as the hottest year on record. 2011 cooled off to only the 11th hottest year on record, but experts expect the next few years will likely again set new records, as humans continue pumping 30 billion tons of CO2 from fossil sources into the atmosphere.

Related Posts