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” Small volcanic eruptions help explain a hiatus in global warming this century by dimming sunlight and offsetting a rise in emissions of heat-trapping gases to record highs, a study showed on Sunday.
Eruptions of at least 17 volcanoes since 2000 … ejected sulfur whose sun-blocking effect had been largely ignored until now by climate scientists, it said.
The pace of rising world surface temperatures has slowed since an exceptionally warm 1998, heartening those who doubt that an urgent, trillion-dollar shift to renewable energies from fossil fuels is needed to counter global warming.”
"This is a complex detective story," said Benjamin Santer of the Lawrence Livermore National Laboratory in California, lead author of the study in the journal Nature Geoscience that gives the most detailed account yet of the cooling impact of volcanoes.
"Volcanoes are part of the answer but there's no factor that is solely responsible for the hiatus," he told Reuters of the study by a team of U.S. and Canadian experts.”
“Santer said other factors such as a decline in the sun's output, linked to a natural cycle of sunspots, or rising Chinese emissions of sun-blocking pollution could also help explain the recent slowdown in warming.
The study suggested that volcanoes accounted for up to 15 percent of the difference between predicted and observed warming this century. All things being equal, temperatures should rise because greenhouse gas emissions have hit repeated highs.”
“Despite continued growth in atmospheric levels of greenhouse gases, global mean surface and tropospheric temperatures have shown slower warming since 1998 than previously. Possible explanations for the slow-down include internal climate variability, external cooling influences and observational errors. Several recent modelling studies have examined the contribution of early twenty-first-century volcanic eruptions to the muted surface warming.”
The Jet stream
The North Atlantic current
Volcanism
These will explain the hiatus in global temperature increase in the Northern Hemisphere.
There is no hiatus in the southern hemisphere (not in Australia anyway)
markosity1973
reply to post by talklikeapirat
There is no hiatus in the southern hemisphere (not in Australia anyway)
The La Nina shift helped a bit for one summer, but we are back on the path to warmness,
en.wikipedia.org...
*edit* My apologies, I did not answer your question re the Jetstream and the North Atlantic current. To avoid repeating myself, have a look at this thread where both are discussed, with a link to thread from 2010 re the North Atlantic current.
talklikeapirat
reply to post by markosity1973
There is no hiatus in the southern hemisphere (not in Australia anyway)
There's only Australia in the Southern Hemisphere?
Obviously, the owners of coal and oil will not be enthusiastic about this. One has to free oneself from the illusion that international climate policy is environmental policy. This has almost nothing to do with environmental policy anymore, with problems such as deforestation or the ozone hole.
markosity1973
reply to post by talklikeapirat
Link to refute the hiatus theory, explaining where it started and why it is wrong here
randomtangentsrme
The fact that volcanoes, solar activity, and other variables are not accounted for in AGW models, just prove how little science is behind this scam.
I'm not saying human kind isn't playing a part here, but the Earth has survived far worse, and it will survive anything we throw at it.