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Unusual activity of the Sun during recent decades compared to the
previous 11,000 years
S. K. Solanki1, I. G. Usoskin2, B. Kromer3, M. Schu¨ ssler1 & J. Beer4
Direct observations of sunspot numbers are available for the past
four centuries1,2, but longer time series are required, for example,
for the identification of a possible solar influence on climate and
for testing models of the solar dynamo. Here we report a
reconstruction of the sunspot number covering the past 11,400
years, based on dendrochronologically dated radiocarbon concentrations.
We combine physics-based models for each of the
processes connecting the radiocarbon concentration with sunspot
number. According to our reconstruction, the level of solar
activity during the past 70 years is exceptional, and the previous
period of equally high activity occurred more than 8,000 years
ago.We find that during the past 11,400 years the Sun spent only
of the order of 10% of the time at a similarly high level of
magnetic activity and almost all of the earlier high-activity
periods were shorter than the present episode. Although the
rarity of the current episode of high average sunspot numbers
may indicate that the Sun has contributed to the unusual climate
change during the twentieth century, we point out that solar
variability is unlikely to have been the dominant cause of the
strong warming during the past three decades3
Originally posted by melatonin
Solar activity cannot explain current warming, it has likely contributed, but it is not sufficient to explain the current warming.
Originally posted by Beachcoma
How about undersea megaplumes? Ocean warming. I don't hear enough about it but it's quite suspect to me. What can you tell me about it? It seems to fit this article I found, which isn't getting much attention:
Carbon dioxide did not end the last Ice Age
Because such deep seawater circulates from the coast of Antarctica, this deep-water warming implies that the Southern Ocean drove the last major climate change. Stott notes that the periodic wobble in the Earth's rotational axis described by the Milankovitch cycles led to more sunshine falling on the Antarctic at the same time—a likely cause of the warming waters. "The amount of solar energy increased at the same time as this deep-sea warming," he says. "Sea ice around the Southern Ocean was withdrawing."
According to the marine core sample, a full millennium passed—enough time for both the deep and surface waters to entirely switch places—before sea-surface temperatures and global atmospheric levels of CO2 began to rise. The greenhouse gas then further warmed the changing climate, Stott says.
Originally posted by Liste
There is a lot of hype about man made Global Warming, and the agenda is being pushed very hard.