Sentences with phrase «volcanic eruptions caused»

Add to it the recent finding that volcanic eruptions caused 0.05 — 0.12 C of cooling since 2000, and there is little - to - no pause at all.

If recent volcanic eruptions caused.05 to.12 C relative cooling since 2000, what did pre-2000 volcanic eruptions do to whatever the average temp might have been?

Volcanic eruptions caused some large short - term negative forcings (according to GISS, that is — I think they were actually much smaller) but had no overall effect.

«Volcanic eruptions caused major weather and climatic changes on timescales ranging from hours to centuries» http://www.pnas.org/content/early/2011/06/30/1104923108.abstract

In the past, volcanic eruptions caused by changes at plate boundaries have warmed the atmosphere by pumping out greenhouse gases.

Did the volcanic eruptions cause the extinctions?

Once circular, it was known as Strongili, «the Round One», but some 3,600 years ago, at the height of the ancient Minoan civilization, a mighty volcanic eruption caused the centre of Strongili to sink, leaving a water - filled crater — Santorini's famous caldera.

This suggested that an ice age could be initiated within a few years by eg a volcanic eruption causing cooling that caused widespread snow cover, causing further cooling by reflecting sunlight etc..

Or volcanic eruption causes thin shell of dust to surround earth - you put same size of shell in L - 1, sunlight needs to pass thru it twice before reaching Earth, instead passing thru it once.

* Large volcanic eruptions cause a major dynamical response in the atmosphere * CMIP5 models are assessed for their ability to simulate this response * No models in the CMIP5 database sufficiently represent this response

We know some volcanic eruptions cause cooling.

In general, volcanic eruptions cause very short term perturbations of the climate system as sulphates ejected into the stratosphere only remain there for a few years.

Not exact matches

Catastrophes can be caused by various natural events, including, among others, hurricanes, tornadoes and other windstorms, earthquakes, hail, wildfires, severe winter weather, floods, tsunamis, volcanic eruptions and other naturally occurring events, such as solar flares.

It is entirely likely that causes such as fluctuations in the sun's intensity and volcanic eruptions may have contributed to a change in the global atmospheric temperature.

How about the clouds from volcanic eruptions which have caused «years without summers» (or springs).

Scientists have proposed that ozone depletion caused by periodic volcanic eruptions over nearly a million years was one cause of the end - Permian extinction, but how has been unclear.

The extinction at the end of the Permian is thought to have been caused by volcanic eruptions in Siberia over hundreds of thousands if not a million years that produced what are known today as the Siberian Traps: lava fields covering much of northern Russia and originally encompassing nearly 3 million square miles with an average thickness of about 1,000 feet.

Volcanoes are complex geothermal phenomena, and as every kid knows, a volcanic eruption is caused when someone puts a tablespoon of baking soda into a crater of vinegar.

Th experiment suggests that enhanced UV - B at the end of the Permian, caused by ozone depletion from volcanic eruptions, could have contributed to Earth's largest mass extinction.

Benca irradiated 18 - inch - tall, bonsai - like pines with UV - B dosages up to 13 times stronger than on Earth today, simulating the effects of ozone depletion caused by immense volcanic eruptions that occurred at the end of the Permian Period.

These giant waves, caused by earthquakes, volcanic eruptions, and underwater landslides, are some of the deadliest natural disasters known; the 2004 tsunami in the Indian Ocean killed over 230,000 people, a higher death toll than any fire or hurricane.

But even earlier readings can provide a record of natural climate variation caused by volcanic eruptions or cycles in ocean circulation.

The strain is accommodated by either rocks sliding past one another, causing earthquakes, or by molten rocks welling up from deep underground to fill the opening space, ultimately leading to volcanic eruptions.

Volcanic eruptions and solar variations were still plausible causes of change, and some argued these would swamp any effects of human activities.

Gigantic volcanic eruptions and the greenhouse gas emissions they caused wiped out around 90 percent of all animal species according to estimates.

Rising sea levels caused by global warming could fuel more volcanic eruptions, possibly resulting in mass extinctions

Layered volcanic rocks in Eastern Greenland that are up to 4 miles thick were formed during ancient volcanic eruptions that caused a global warming event called the Palaeocene - Eocene Thermal Maximum (PETM).

Interestingly, some scientists argue that without the cooling effect of major volcanic eruptions such as El Chichn and Mount Pinatubo, global warming effects caused by human activities would have been far more substantial.

Previous episodes of acidification — possibly caused by CO2 released from huge, sustained volcanic eruptions — had a tremendous ecological impact.

Many scientists believe this collision caused the extinction of most dinosaurs, although some still argue that immense volcanic eruptions in India may also have played a role.

Some geologists speculate that massive volcanic eruptions covering areas as large as modern continents triggered the release of methane buried in the ocean floor, causing a greenhouse effect.

In June, scientists at the National Oceanic and Atmospheric Administration announced that they had finally found the cause of the hiatus, and it wasn't shifting winds or pint - size volcanic eruptions as some scientists proposed.

The research highlights the impact of volcanic eruptions on climate, when particles produced can reflect sunlight from Earth, causing long - lasting cooling.

Not until 201 million years ago did dinosaurs begin to dominate worldwide, say Olsen and Irmis — after a mass extinction, caused by volcanic eruptions, wiped out many of their cold - blooded reptile and amphibian competitors.

Atmospheric changes that caused volcanic eruptions centuries ago, such as the one in Timanfaya or the Tambora volcano (Indonesia)- which hid the sunlight for months -, had an impact on high - mountain centennial forests in the Iberian Peninsula, as stated in an article published in the journal Science of the Total Environment in which the lecturer Emilia Gutiérrez, from the Faculty of Biology of the University of Barcelona, has taken part.

However, volcanic eruptions before 1900, like the Tambora 1815 event, have the possibility to cause massive death tolls and also cause lower temperatures around the world leading to food security issues.

But other scientists have pointed to natural causes, including volcanic eruptions, disease, and climate change at the end of last Ice Age, as the key reasons for these species» demise.

Molten rock (or magma) has a strong influence on our planet and its inhabitants, causing destructive volcanic eruptions and generating some of the giant mineral deposits.

Professor Sybren said: «It can be excluded, however, that this hiatus period was solely caused by changes in atmospheric forcing, either due to volcanic eruptions, more aerosols emissions in Asia, or reduced greenhouse gas emissions.

Once the ice melted, driven by a runaway greenhouse effect caused by volcanic eruptions, it formed a freshwater layer up to 2 kilometres thick.

Professor Drijfhout added: «When a similar cooling or reduced heating is caused by volcanic eruptions or decreasing greenhouse emissions the heat flow is reversed, from the ocean into the atmosphere.

A few years ago, he was trying to get people to take to his idea of how to mitigate global warming by pumping sulfur dioxide into the stratosphere, mirroring the cooling effect caused by large volcanic eruptions.

The USArray is part of EarthScope, a program of the National Science Foundation that deploys thousands of seismic, GPS and other geophysical instruments to study the structure and evolution of the North American continent and the processes the cause earthquakes and volcanic eruptions.

A mysterious, centuries - long cool spell, dubbed the Little Ice Age, appears to have been caused by a series of volcanic eruptions and sustained by sea ice, a new study indicates.

We conclude that the hypothesized «volcanic winter» that followed the Toba eruption did not have a significant impact on the climate of East Africa and was not the cause of a human bottleneck in Africa around 75 ka B.P.

It is well - established in climatology that different causes and mechanisms have caused climate changes in the past (orbital variations, plate tectonics, solar variability, volcanic eruptions, etc.), so that a cause - effect relationship has to be determined for each individual case, rather than looking for one overall «driver».

Armed with a clear timeline, the archeologist Marean was able to show that those human ancestors living at Pinnacle Point and Vleesbaai — located about five miles apart — showed remarkable improvement in their life style during the volcanic winter caused by the Toba eruption.

The change in atmospheric pressure is on the order of 0.01 % or less of the pressures which cause an explosive volcanic eruption.

Perhaps in the future a large volcanic eruption (VEI 5 - 6 or greater) may cause 1 - 2 °C swings in global temperatures as they rise further as we go from enhanced greenhouse effect to enhanced reductions in insolation from thicker sulfuric acid vails.

It is possible that this volcanic eruption might have indirectly caused the near extinction of humans.