I also found a paper analyzing sulfate from a different Greenland ice core for
volcanic eruption signals: http://epic.awi.de/Publications/Big2001a.pdf
There are also distinctive
volcanic eruption signals in the ocean heat content record.
Bradley, R.S., 1988: The explosive
volcanic eruption signal in northern hemisphere continental temperature records.
Not exact matches
«As it's not possible to always successfully predict
volcanic events due to the lack of complete knowledge of the
signals leading to catastrophes, these results are an important new finding and ultimately we hope they will contribute to our understanding of where and when the next
volcanic eruption will be.»
Infrasound
signals can remain strong as they travel over large distances, making them useful for pinpointing the location and size of events such as nuclear explosions, meteorite strikes,
volcanic eruptions and sometimes earthquake ruptures.
The research, published in the journal Scientific Reports, suggests that
signals associated with tidal cycles could potentially provide advanced warning of certain types of
volcanic eruptions.
For larger forcings (say a big
volcanic eruption), the
signal can rise out of the weather «noise» more rapidly.
I think it is non-controversial that one good sized
volcanic eruption will overwhelm the CO2
signal and cool the planet for a few years.
He writes: I say this is a result of the action of climate phenomena that oppose the cooling... if my theory were correct, we should see a
volcanic signal in some other part of the climate system involved in governing the temperature... I should see an increase in the heat contained in the Pacific Ocean after the
eruptions Thing is, El Ninos release heat from the ocean, they don't store heat.
The averaging reduces the
signal from short - term natural variability, such as associated with El Niño events and
volcanic eruptions, which can leave a clear mark on annual averages.
Following major
volcanic eruptions, it is necessary to avoid corruption of the backscattered
signal caused by enhanced aerosols.
When low and elongated sunspot cycles correlate with cooling periods of earth (eg Dalton and Maunder minimum), and
volcanic eruptions add another cooling
signal then the future is definitely looking very dangerously cold.
Over the last millennium the agreement between the tree - ring data and volcano / ice - core data is high: years of ring - width minima can be matched with known
volcanic eruptions or ice - core
volcanic signals in 86 % of cases.
Many years of low growth identified in a western USA regional chronology of upper forest border bristlecone pine (Pinus longaeva and Pinus aristata) over the last 5000 yr coincide with known large explosive
volcanic eruptions and / or ice core
signals of past
eruptions.
The natural
signal is, at least in climate model simulations, largely due to a hiatus in
volcanic eruptions (see Figure S4).