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Originally posted by Muaddib
We know that the output of the Sun has been increasing in the past 60 years more than during the last 8,000 years. Changes that happen in the Sun affect not only Earth but the other planets in the solar system too.
Originally posted by Muaddib
That graphs which you gave shows almost no increase in the radiance of the sun for the last 40 years... How is that so when we know for a fact that the radiance of the sun has been increasing 0.014 degrees K per year for the last 60 years?
The difference between 60 years ago and today in the radiance shown in that graph should be 0.014 x 60 = 0.84 degrees K. Of course appart from the natural fluctuations of temperature which happen in the sun during it's 11 year cycles.
And the most important question, if the sun is not the cause for the current warming observed in several planets in the solar system, then what is causing the Climate Changes in the form of warming we are seeing in several planets of our solar system?
Originally posted by melatonin
The thing is, Muaddib, the graph you presented earlier from Solanki (the thousand year scale solar data) is the same data I gave above - just looking at the more recent period. It's Solanki's data.
“The problem is that no one sensor has collected data continuously over this time period, and so to make a long-term dataset, we have to splice together the results from different instruments, each with its own accuracy and reliability issues, only some of which we are able to account for,” says solar physicist Judith Lean from the U.S. Naval Research Laboratory in Washington, D.C.
Originally posted by melatonin
As for the 0.014K data, you'll have to point out where it came from.
Monitoring the Solar Temperature: Spectroscopic Temperature Variations of the Sun
Author(s) David F. Gray and William C. Livingston
Identifiers The Astrophysical Journal, volume 474, part 1 (1997), pages 802–809
DOI: 10.1086/303489
Bibcode: 1997ApJ...474..802G
Availability This site: PS | PDF (390.2k) | HTML (46.5k)
Copyright © 1997, The American Astronomical Society.
Abstract The C i 5380 line in the solar flux spectrum was measured over the 19781992 interval. Analysis of the data shows seasonal and instrumental effects, but after allowance for these, the ratios of spectral line depths, C i 5380 to Fe i 5379 and to Ti ii 5381, are shown to be robust indicators of effective temperature. These data show the solar temperature to have varied systematically during the activity cycle and nearly in phase with other indicators of the cycle. The amplitude of the variation is 1.5 K ± 0.2 K, similar to but slightly less than the range implied by the variations of the sunspot-corrected irradiance. There is also evidence for a secular trend amounting to +0.014 K per year.
Originally posted by melatonin
Orbital variations? Internal variations? Plus maybe a bit of variation in solar irradiance.
We tend to think of our Sun as a paragon of stability. While other stars pulsate, go nova, collapse, or bubble and churn like overheated pots of oatmeal, Sol provides us with steady, dependable radiance. Of course there are variations, such as the 11 year sunspot cycle, but these are predictable and benign.
Recent evidence, however, suggests that we don't know all there is to know about the nearest star. Drs. David Gray (University of Western Ontario) and William Livingston (Kitt Peak) have been studying the Sun's temperature with a technique that compares the strength of absorption lines in the solar spectrum. Gray finds that in addition to a fluctuation of 1.5 degrees Kelvin over the 11-year cycle, the temperature of the sun is steadily increasing by 0.014 degrees/yr.
Of course, this doesn't mean that the Sun will just continue to heat up. The observed change may just be part of a much longer cycle. During the 17th to mid-18th centuries, astronomers noticed a complete absence of sunspots and geological records show that the Earth's temperature dropped by 1 to 2 degrees during that time. This may not seem like much, but it was enough to freeze the Thames river and shorten Europe's growing season, causing famine in many countries.
A change in albedo will alter the absorption and
re¯ection solar radiation. A modifed albedo can result
from all of the factors investigated, although it is obvious
that the 2 x CO2 radiation impact would be minimal as
it is addressed in this study.
Originally posted by Muaddib
The things is that the data in that graph has been extrapolated from different sources all which have different calibration, accuracy and reliability issues.
Monitoring the Solar Temperature: Spectroscopic Temperature Variations of the Sun
So it is just coincidence that we are seeing warming in several planets in the solar system then? There is no such thing as coincidences in science.
Originally posted by melatonin
Which do you think is most reliable? The last 50 years, or however long before that?
Originally posted by melatonin
You do realise you are also criticising your own data from earlier?
Ilya Usoskin (Geophysical Observatory, University of Oulu, Finland) and his colleagues have investigated the solar activity over the past centuries. Their study is to be published this week in Astronomy & Astrophysics Letters. They compare the amount of Titanium 44 in nineteen meteorites that have fallen to the Earth over the past 240 years. Their work confirms that the solar activity has increased strongly during the 20th century. They also find that the Sun has been particularly active in the past few decades.
Originally posted by melatonin
So you are looking at 1.5K on top of what solar temperature? What is the current increase? That was for up to 1992.
Originally posted by melatonin
There are. One example is illusory correlation.
Originally posted by Muaddib
What do you think the conclusion is from several research all which say the sun's output has increased during the last 60 years more than for at least 1,000 years while others show it has increased more than during the last 8,000?...
They all point to the same conclusion, during the last few decades of the 20th century the sun's output and the number of sunspost has increased. Not only that but the Earth's magnetic field is weaker now than at any time during the last 780,000 years, which also affects how much radiation we get from the sun.
Every study done shows this, that the output of the sun has increased during the late 20th century more than in the past.
And not all research extrapolates different data like that graph you gave. Even the latest Mann/Jones and associates graphs on the temperature of Earth is another "extrapolation of different graphs all which if viewed separately show a different picture to the claims made by Mann and associates.
The 1.5 degrees K is a fluctuation in temperature that the sun goes through in it's 11 year cycle. On top of that the sun's output and the number of sunspots have been increasing strongly during the last few decades more than for thousands of years.
Yes, such as the illusion that it is because of anthropogenic CO2 that the current warming is happening on Earth, despite the fact that the warming started 260 years for most of the world before CO2 levels began to increase...
Originally posted by Muaddib
His research in fact points out that a doubling of air's CO2 content led to a temperature increase of 0.014°C.
Originally posted by melatonin
Where? A 0.014'C increase where?
I hope your not quote-mining again...
The contribution to maximum temperature is small for
2 X CO2 radiation, with a mean of 0.014 °C, while the
2 X CO2 biology indicates a relatively large cooling
contribution of 0.747 °C.
Originally posted by Muaddib
Since i have already responded to your other statement in another thread, and since apparently you did not notice the link I gave before, here it is again with an excerpt...
The contribution of a doubling of CO2 will cause a 0.014 C increase...
Keep trying to twist things around melatonin.
Originally posted by melatonin
.................
A 0.014'C increase where? Global? Regional? In your pants?
Originally posted by Muaddib
Well you are probably right about this one...... Now that spring is here, which somedays it feels more like summer, my pants would probably produce more heat than doubling CO2 levels in the atmosphere.... I have to start wearing shorts before I heat up the atmosphere too much....
Originally posted by melatonin
Well, I know for sure that a lot of hot-air is emitted from your vicinity...
Originally posted by melatonin
So, anyway, you do know that the Eastman article is a regional scale model based on one particular type of ecological environment? And therefore doesn't really tell us much for the global scale effects?
Originally posted by Muaddib
Nope, sorry, a doubling of CO2 in Earth's atmosphere would not increase temperatures much, and CO2 levels have not even doubled.
Finally, the model results suggest that the 2x CO2 biological effect can dominate the overall effects on temperature. This must be interpreted in the context it was presented. This is a regional-scale sensitivity study. These results cannot be linearly scaled up to global scales.
Originally posted by Alex2
At least the CO2 from one's lungs comes from food, which ultimately comes from atmospheric CO2 = little or no net change. Efficient computers and alternative energy investment should help with the computer usage.
Originally posted by Alex2
The water vapor and CO2 lags warming arguments are common, but they don't hold up under analysis. On water vapor (a feedback), see the link in the intro here. Also see #10 and #13 on warming preceding CO2 (forcing and/or feedback depending on the situation). Right now, we have a strengthening warming trend in the presence of a rapid CO2 accumulation, and the absence of a natural forcing sufficient to explain it. So apparently it's not just a continuing natural thaw.
The Northern Hemisphere temperature history as modeled using Milankovitch variations in solar radiation modulated by volcanic aerosols, using oceans and carbon dioxide only as minor dependent variables. BP means before 1955 CE.
This figure captures very well, the “little ice age”, the Medieval Warm Period, and other known variations of late BCE and early CE times. The drivers of this model are Milankovitch calculations (average for the entire Hemisphere) and the observed volcanic record described above. Carbon dioxide is treated as a very minor dependent variable. It is unlikely that a general circulation model which assumes a major role of carbon dioxide can duplicate this known climatic sequence.
Originally posted by Muaddib
You should read what Professor Reid A. Bryson actually has to say on the matter.