Archive for the ‘volcanos’ Category

Iceland’s Katla volcano [image credit: icelandmonitor]


Precision measurements show that sub-glacial volcanoes have been greatly underestimated as an ongoing source of carbon dioxide emissions. When will they re-do the calculations?
H/T Warwick Hughes

Recent research suggests the volume of volcanic CO2 being emitted into the atmosphere is far greater than previously thought, challenging man-made warming, says ClimateChangeDispatch.

The cornerstone principle of the global warming theory, anthropogenic global warming (AGW), is built on the premise that significant increases of modern era human-induced CO2 emissions have acted to unnaturally warm Earth’s atmosphere.

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Even today, more than eighty percent of our ocean is unmapped, unobserved, and unexplored. How many more hidden volcanoes may remain to be discovered?

The find offers a glimpse into a previously unknown marine ecosystem — and spotlights just how little we know about the seafloor, says Euronews.

While mapping the seafloor some 250 miles off the coast of the Australian island of Tasmania, scientists recently discovered what’s being called a “volcanic lost world” deep underwater.

The chain of volcanic seamounts — huge undersea mountains that loom as tall as 9,800 feet, or more than six times taller than the Empire State Building — offer a glimpse into a previously unknown ocean ecosystem.

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Credit: USGS


It turns out the influence of natural drivers of tropical belt expansion and contraction is ‘poorly understood’. The authors say: ‘Our results warn of potential socio-economic consequences of future variations in tropical belt width driven by natural climate variability or stratospheric aerosol injections, whether volcanic or artificial.’
H/T Phys.org

For the first time, scientists have traced the north-south shifts of the northern-most edge of the tropics back 800 years, reports a University of Arizona-led international team.

The movement of the tropical boundary affects the locations of Northern Hemisphere deserts including the Sonoran, Mohave and Saharan. Those deserts sit just north of the tropical belt, which includes the subtropics.

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A rapid-fire lecture on solar-planetary links, sunspots, volcanoes, ice cores, climate and a whole lot more, including a closer look at the Spörer Minimum.

CO2 is Life

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Volcanic eruption


‘The 1815 eruption of Mount Tambora was one of the most powerful in recorded history, with a Volcanic Explosivity Index (VEI) of 7’, says Wikipedia.

The unusually cold year of 1816 has been linked to one of the most powerful volcanic eruptions in recorded history, and now we may know how, says New Atlas.

A new paper explains how electrified ash from the eruption could have “short-circuited” the Earth’s ionosphere and triggered the “Year Without A Summer.”

The year 1816 was a weird one, climatically speaking. Months that would normally be warm and pleasant were cold, rainy and overcast, leading to crop shortages across much of the Northern Hemisphere.

A new paper out of Imperial College London explains how electrified ash from the eruption could have “short-circuited” the Earth’s ionosphere and triggered the “Year Without A Summer.”

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Volcanic eruption


Interesting results from this research into where and how volcanoes might fit into the oceans/climate picture.

Volcanic eruptions are among the most important natural causes of climate change, playing a leading role over the past millennium, says Phys.org.

Injections of sulfate aerosols into the lower stratosphere reduce the incoming solar radiation, in turn cooling the surface.

As a natural external forcing to the Earth’s climate system, the impact of volcanic aerosols on the climate has been of great concern to the scientific society and the public.

In recent years, scientists have found that there is a relationship between volcanic eruptions and the El Niño-Southern Oscillation (ENSO) based on reconstructions and model simulations, which is manifested in increased/decreased sea surface temperature (SST) gradient over the equatorial Pacific.

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Nature is awesome.

hawaii-lava

Lava flow in Hawaii

One volcanologist commented: “When a house today might look like it’s perfectly safe, it might get taken out by a lava flow five years from now if the eruption keeps on going.”

So much destruction, as ScienceAlert reports.

For the fleeing residents who had to evacuate the cracked, burning streets of Leilani Estates, Hawaii, last week, it would be natural to hope they could return to their homes shortly once the fury of eruption relents.

But that fury may not quit soon. The truth is this eruption didn’t happen last week.

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The edge of the Thwaites glacier [credit: NASA photograph by Jim Yungel]


This BBC report seems unaware that a study in 2014 found that parts of the Thwaites Glacier are subject to melting due to subglacial volcanoes and other geothermal “hotspots”. The existence of this group of volcanoes has long been known.

British and American scientists will assess the stability of one of Antarctica’s biggest ice streams, reports BBC News.

It is going to be one of the biggest projects ever undertaken in Antarctica.

UK and US scientists will lead a five-year effort to examine the stability of the mighty Thwaites Glacier.

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The planet Mercury, as imaged by the MESSENGER spacecraft [Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington]


More theoretical speculations about Mercury’s origins, arising from what is now believed to be evidence of historical volcanic activity.

Mercury is the closest planet to the sun, but far from being a dull cinder of a world, it has instead turned out to be a real eye opener for geologists, says Phys.org.

Among the revelations by NASA’s MESSENGER probe, which first flew past Mercury in 2008 and orbited it between 2011 and 2015, is the discovery of a hundred or so bright red spots scattered across the globe. Now they are at last being named.

Although they appear more yellow-orange than red on the accompanying colour-enhanced images, they are the reddest features on Mercury, a planet that looks dull and grey on unenhanced images.

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Recent volcanic activity at Mount Agung in eastern Bali [image credit: BBC]


Any kind of advance in understanding volcanic processes has to be welcomed. Sci-News reporting.

Tiny crystals of clinopyroxenes that form deep in volcanoes may be the key for advance warnings before volcanic eruptions, according to a team of vulcanologists from the University of Queensland, Australia, and Trinity College Dublin, Ireland.

“Our research provided new information that could lead to more effective evacuations and warning communications,” said University of Queensland vulcanologist Dr. Teresa Ubide.

“This could signal good news for the almost one in 10 people around the world who live within 100 km of an active volcano.”

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Sun at solar system barycentre 1990 [via Arnholm’s solar simulator]


H/T Michele Casati

INFLUENCE OF SOLAR RETROGRADE MOTION ON TERRESTRIAL PROCESSES
N.S.Sidorenkov, Ian Wilson

ABSTRACT. The influence of solar retrograde motion on secular minima of solar activity, volcanic eruptions, climate changes, and other terrestrial processes is investigated. Most collected data suggest that secular minima of solar activity, powerful volcanic eruptions, significant climate changes, and catastrophic earthquakes occur around events of solar retrograde motion.

Keywords: barycentric motion of the sun; secular minima of solar activity, volcanic eruptions, climate changes; the historical process of humankind.

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Nepal Earthquake [image credit: BBC]


The research suggests that both magnitude and frequency of earthquakes are related to plate collision speed.

Earthquakes that happen in densely populated mountainous regions, such as the Himalaya, spell bigger earthquakes because of a fast tectonic-plate collision, according to a new study reported at Phys.org.

Researchers from Geophysical Fluid Dynamics – ETH Zürich in Switzerland, say their findings give people a more complete view of the risk of earthquakes in mountainous regions.

The new study shows that the frequency and magnitude of large earthquakes in the densely populated regions close to mountain chains – such as the Alps, Apennines, Himalaya and Zagros – depend on the collision rate of the smaller tectonic plates.

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This is the finding from a new research paper entitled ‘Enhanced ice sheet melting driven by volcanic eruptions during the last deglaciation.’

Another very recently published paper (‘Very large release of mostly volcanic carbon during the Palaeocene–Eocene Thermal Maximum’) says something similar:
‘The Palaeocene–Eocene Thermal Maximum [PETM], was a global warming event that occurred about 56 million years ago, and is commonly thought to have been driven primarily by the destabilization of carbon from surface sedimentary reservoirs such as methane hydrates. However, it remains controversial whether such reservoirs were indeed the source of the carbon that drove the warming…[We] identify volcanism associated with the North Atlantic Igneous Province rather than carbon from a surface reservoir, as the main driver of the PETM. This finding implies that climate-driven amplification of organic carbon feedbacks probably played only a minor part in driving the event.’

So two papers saying volcanic ash on the ice, not carbon dioxide in the air, was the main player in PETM deglaciation.
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Volcanic eruptions have been known to cool the global climate, but they can also exacerbate the melting of ice sheets, according to a paper published today in Nature Communications, says Phys.org.

Researchers who analyzed ice cores and meltwater deposits found that ancient eruptions caused immediate and significant melting of the ice sheet that covered much of northern Europe at the end of the last ice age, some 12,000 to 13,000 years ago.

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School destroyed by mud flow [image credit: Hugh e82 / Wikipedia]


Whether caused by the blowout of a natural gas well, a distant earthquake or something else, the Sidoarjo mud flow is the biggest of its kind in the world.

The world’s most destructive mud volcano was born near the town of Sidoarjo, on the island of Java, Indonesia, just over 11 years ago – and to this day it has not stopped erupting, as The Conversation explains.

The mud volcano known as Lusi started on May 29, 2006, and at its peak disgorged a staggering 180,000 cubic metres of mud every day, burying villages in mud up to 40 metres thick.

The worst event of its kind in recorded history, the eruption took 13 lives and destroyed the homes of 60,000 people. But although the mud is still flowing more than a decade later, scientists are not yet agreed on its cause.

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Is there a contradiction in this IB Times report? First it says volcanism causes cooling, then we’re told the resulting volcanic CO2 could have caused warming.

High concentration of mercury identified in ancient sediments suggest that large-scale episodes of volcanism coincided with the end-Triassic mass extinction around 201 million years ago.

It is likely that these huge pulses of volcanic activity led to great environmental perturbations, leading to the extinction of many species living on Earth at the time and setting the scene for the dawn of the dinosaurs.

Previous studies had already shown that volcanic activity was happening around the time of the extinction and there was some evidence for an increase in the concentration of carbon dioxide (CO2) in the atmosphere.

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World’s hottest borehole, Iceland [credit: BBC]


Not much oil or gas, but plenty of steam available for use in Iceland as Phys.org reports.

It’s named after a Nordic god and drills deep into the heart of a volcano: “Thor” is a rig that symbolises Iceland’s leading-edge efforts to produce powerful clean energy.

If successful, the experimental project could produce up to 10 times more energy than an existing conventional gas or oil well, by generating electricity from the heat stored inside the earth: in this case, volcanic areas.

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It sounds promising, but what happens if the satellites fail to predict a serious eruption? The case of the convicted but later exonerated Italian earthquake experts springs to mind.

A UK-led team of scientists is rolling out a project to monitor every land volcano on Earth from space, reports BBC News.

Two satellites will routinely map the planet’s surface, looking for signs that might hint at a future eruption. They will watch for changes in the shape of the ground below them, enabling scientists to issue an early alert if a volcano appears restless.

Some 1,500 volcanoes worldwide are thought to be potentially active, but only a few dozen are heavily monitored. One of these is Mount Etna where, last month, a BBC crew was caught up in a volcanic blast while filming a report on the new satellite project.
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Mount Etna: BBC crew caught up in volcano blast 

Posted: March 16, 2017 by oldbrew in News, volcanos

Mount Etna, Sicily


Etna is known to be very active but this may have been an unusually large eruption by its own standards.

A BBC team and a number of tourists have suffered minor injuries after being caught up in an incident on the erupting volcano Mount Etna in Sicily, reports BBC News.

“Many injured – some head injuries, burns, cuts and bruises,” tweeted BBC science reporter Rebecca Morelle. Lava flow mixed with steam had caused a huge explosion, which pelted the group with boiling rocks and steam, she said.

About eight people had been injured, with some evacuated from the mountain by rescue teams, she added.
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Credit: BBC

Credit: BBC


Pattern or coincidence? Theorists will have their ideas.

Why are “giant fountains of lava” suddenly pouring out of some of the most dangerous volcanoes on the entire planet, and why are so many long dormant volcanoes suddenly roaring back to life?

The spectacular eruption of Mt. Etna in Italy is making headlines all over the world, but it is far from alone, as Sott.net reports.

According to Volcano Discovery, 35 major volcanoes either are erupting right now or have just recently erupted, and dozens of others are stirring. So what is causing this upsurge in volcanic activity? Is something strange happening inside the Earth?
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