VOLCANIC ERUPTIONS and GLOBAL WARMING?

Question

For the people pretending that volcanic eruptions are a much higher emitter of CO2 than the mankind:

why don´t we see a surge in CO2 concentrations worldwide after volcanoes erupt ???

exact, through SOx emissions and dust

Answer 1

As a very rough figure volcanoes contribute about 200 million tons of CO2 a year to the atmosphere - it varies significantly from year to year. There's no accurate measurement, perhaps the best estimate was the one made by T M Gerlach of the US Geological Survey in 1991, he estimated total emissions to be in the oder of 3 to 4 trillion mol per year.

Humans on the other hand contributed 29 billion tons of CO2 to the atmosphere last year - almost 200 times the volcanic contribution.

Where volcanoes do change the climate is by cooling it - which I'm sure you already know. The most recent notable cooling event happened in the wake of the 1991 eruption of Mount Pinatubo when global temperatures fell by approximately 0.5 degrees C.

This cooling is occasioned by sulphur dioxide emissions which reflect sunlight back into space. In an average year total volcanic SO2 emissions are in the order of 24 million tons - about one third of the human contribution. Following a major volcanic event levels of atmospheric SO2 rise significantly and a period of cooling follows which lasts a few years (3 or 4) before the SO2 is dissipated from the atmosphere.

What's intersting I find is the rise in CO2 emissions that are attributed to volcanoes by some global warming skeptics - a look back at some of the answers on this forum will illustrate this. Perhaps a year ago we were told volcanoes emited as much CO2 as humans, then it became that they emitted 10 times as much, then as much in a day that humans do in a year, now it's more per year than humans have emited in history. It makes you wonder what the next claim will be.

Answer 2

Please do not positioned credence in an excessive amount of of Leche's reply, he has a few correct however different components depart a lot to be favored... Sorry to mention that the query is often in errors. Volcanic eruptions give a contribution way more to international cooling than warming for the next factors; a million, Short-time period the CO2 published is the sort of tiny quantity that it might take decades to construct as much as an considerable degree. two, Particles ejected in the course of an eruption can stay airborne top within the surroundings for years - The 1883 eruption of krakatoa disrupted the elements for five years and dropped international temperatures by means of a million.two levels C. three, SO2 that enters the stratosphere motives cooling - Mount Pinatubo is a traditional instance

Answer 3

Maybe if it was a large enough volcanoe to kill the dinosaurs? Hence CO2 wiped out the dinosaurs?

Answer 4

Volcanoes spew particulates into the atmosphere which blocks sunlight and leads to global dimming and cooling, not global warming.

Answer 5

I haven't heard that, volcanoes do emit CO2 but not as much as humans.

Answer 6

denali.gsfc.nasa.gov/research/so2/article.html

broken down so whole link will show

denali.gsfc.nasa.gov/
research/so2/article.html