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Runaway Global Warming - Has Arrived pt 14

Re: Runaway Global Warming - Has Arrived pt 14

Unread postby dohboi » Wed 31 May 2017, 21:45:05

Climate science bedeviled by 'tipping points' discusses the very real risks of climate change tipping points:

https://phys.org/news/2017-01-climate-s ... viled.html

Extract: "Of the many things that keep climate scientists awake at night, tipping points may be the scariest.

To start with, these thresholds for deep, sometimes catastrophic change in the complex web of Earth's natural forces, caused by man-made global warming, are largely invisible.

You can't see them on the horizon, and could easily cross one without noticing.

Also, there is no turning back—at least not on a human timescale."
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Re: Runaway Global Warming - Has Arrived pt 14

Unread postby kiwichick » Thu 01 Jun 2017, 02:15:34

happy 1st day of summer to our Northern friends
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Re: Runaway Global Warming - Has Arrived pt 14

Unread postby Cid_Yama » Sun 11 Jun 2017, 01:55:41

Massive frozen methane domes at the bottom of Arctic sea could soon explode
On the seafloor of the Arctic Ocean, a field of huge frozen methane domes has caught the attention of scientists as they believe these structures could signal upcoming methane expulsions that have previously created massive craters in the area.

"We go on expeditions several times a year and are closely surveying this area. These domes are mounds of hydrates that are very sensitive to pressure and temperature," lead author Pavel Serov, PhD candidate at CAGE at UiT The Arctic University of Norway, told IBTimes UK.

"If the temperature rose just a little, they could collapse and methane could escape. The temperature in the ocean has not reached this critical level yet, but it's quite close. We believe that one step before the craters are created, you get these domes," Serov added.

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Re: Runaway Global Warming - Has Arrived pt 14

Unread postby Cid_Yama » Sun 11 Jun 2017, 02:33:27

A new study out of Harvard University reveals that the protective stratospheric ozone layer above the central United States is vulnerable to erosion during the summer months from ozone-depleting chemical reactions, exposing people, livestock and crops to the harmful effects of UV radiation.

Powerful storm systems common to the Great Plains inject water vapor that, with observed temperature variations, can trigger the same chemical reactions over the central United States that are the cause of ozone loss over the polar regions, according to a new paper published in the Proceedings of the National Academy of Sciences.

The paper, led by James G. Anderson, the Philip S. Weld Professor of Atmospheric Chemistry at the Harvard John A. Paulson School of Engineering and Applied Sciences (SEAS), found that stratospheric ozone concentrations over the United States in summer are vulnerable to both increases in water vapor and observed variations in temperature from storm systems over the Great Plains. Increased frequency and intensity of these storm systems, as well as longer-term decreases in stratospheric temperatures, are expected to accompany climate change.

Using extensive aircraft observations in the Arctic stratosphere from the early 2000's, researchers established the chemical framework defining enhanced ozone loss rates with respect to temperature and water vapor. Then they employed recent NEXRAD weather radar observations to demonstrate that on average 4000 storms each summer penetrate into the stratosphere over the central United States, which is far more frequent than was previously thought.

This combination of circumstances puts the stratosphere over states including Texas, Oklahoma, Kansas, Nebraska, Iowa, Missouri, the Dakotas and states that border the Great Plains, at risk for chemical reactions that deplete ozone during summer, potentially leading to higher levels of exposure to damaging UV light from the sun.

"These developments were not predicted previously and they represent an important change in the assessment of the risk of increasing UV radiation over the central US in summer," said Mario J. Molina of the University of California San Diego, the 1995 Nobel Prize winner in stratospheric chemistry, who was not involved in this research.

Stratospheric ozone is one of the most delicate aspects of habitability on the planet. There is only marginally enough ozone in the stratosphere to provide protection from UV radiation for humans, animals and crops.

"Thunderstorms that hydrate the stratosphere can have significant local and regional impacts on Earth's radiation budget and climate," said Cameron R. Homeyer of the University of Oklahoma, a co-investigator on the paper. "This work demonstrates our increasing knowledge of such storms using ground-based and airborne observations and evaluates their potential for depleting stratospheric ozone now and in the future. The results strongly motivate the need for increased meteorological and chemical observations of such storms."

"Rather than large continental-scale ozone loss that occurs over the polar regions in winter characterized, for example, by the term Antarctic ozone hole, circumstances over the central US in summer are very different," said Anderson. "In particular, because of the very frequent storm-induced injection events detailed by studies at Texas A&M and the University of Oklahoma using advanced radar methods, this structure of highly localized but numerous regions of potential ozone loss requires carefully specified observational strategies and systematic surveillance in order to provide the basis for accurate weekly forecasts of ozone loss."

The researchers are calling for extensive characterization of the stratosphere over the central United States in order to forecast short-term and long-term ozone loss related to increasing frequency and intensity of storm systems, higher levels of atmospheric carbon dioxide and methane, and other factors.

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Re: Runaway Global Warming - Has Arrived pt 14

Unread postby pstarr » Sun 11 Jun 2017, 14:30:13

dohboi wrote:Climate science bedeviled by 'tipping points' discusses the very real risks of climate change tipping points:

https://phys.org/news/2017-01-climate-s ... viled.html

I thought it had already arrived, as per the thread title? For the 14th time lol

dohboi wrote:Extract: "Of the many things that keep climate scientists awake at night, tipping points may be the scariest.

To start with, these thresholds for deep, sometimes catastrophic change in the complex web of Earth's natural forces, caused by man-made global warming, are largely invisible.

Gotta agree re complex systems. yup. :idea: Like our world-wide industrial network, with its uncountable almost lifelike production nodes. All powered with petroleum. yikes :?
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Re: Runaway Global Warming - Has Arrived pt 14

Unread postby dohboi » Thu 15 Jun 2017, 17:14:25

Wellll, not exactly ALL powered by ONLY petroleum!

https://upload.wikimedia.org/wikipedia/ ... 015%29.svg
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