blanch152 wrote: » The sun is one of the factors that controls temperature. However, if the sun was the only factor, Venus would be cooler than it is.
blanch152 wrote: » I really hope that there is an exaggerated climate sensitivity to CO2.
blanch152 wrote: » The sun is one of the factors that controls temperature.
Akrasia wrote: » And this exact type of post, is the reason why I do not believe you are arguing on this topic from a position of good faith. When I bring in an expert opinion on how solar activity will affect the future climate, you hide behind a glib comment about vacuum cleaners. Obfuscation, frustrate, denial of basic facts, misrepresentation, quote mining in order to give the worst impression of someone rather than a fair representation of their views etc. These are not the behaviors of someone who wants to discuss something honestly.
dense wrote: » Yes, it may well show that it is the sun that controls temperatures. Which would force a rethink about the alleged C02 problem, where the sun heretofore has all but been discounted by the UNIPCC. NASA has previously stated that the sun is responsible for 25% of warming in the last century.https://www.nasa.gov/topics/solarsystem/features/solar_variability.html When one considers the subsequent disconnect between observations and models, that figure would appear conservative, but not only that, it also suggests a seriously mistaken and exaggerated climate sensitivity to C02.
dense wrote: » Is he one of those people who'd claim a potential maximum 00.66% power saving from the EU regulating domestic vacuum cleaners is going to deliver a "significant" energy reduction? That kind of thing is a problem for "sceptics".
Pa ElGrande wrote: » That would be the very least of your problems. A repeat of cycles like the Dalton or Maunder minimums would be catastrophic for large populations most notably food prices would rise, fuel poverty would increase and there would be even more excess winter deaths. In such circumstances it will become much less feasible for politicians to continue pushing a scheme that that is fundamentally a wealth transfer mechanism from low income people to wealthy people disguised in green wrapping paper.
dense wrote: » Why does it need to be "one story"? C02 may play a minimal role. The sun could actually have a larger role. Sceptics are actually open minded. I listened to the UN's Professor Sweeney, and heard what he had to say, and funnily enough he also "disputed the established science" in his interview. (That's the clanger you couldn't hear, but everyone else could ) What's so odd about suggesting that the barely measurable alleged increase in "global average temperature" may actually have something to do with the heat that mankind has been cumulatively generating on the globe, a globe which we are told is encapsulated in some sort of greenhouse? It certainly seems to have hit the target! There seems to be just one paper which has tried to assess it, from almost 10 years ago Flanner 2009 "Nearly all energy used for human purposes is dissipated as heat within Earth's land–atmosphere system. Thermal energy released from non-renewable sources is therefore a climate forcing term. Averaged globally, this forcing is only +0.028 W m−2, but over the continental United States and western Europe, it is +0.39 and +0.68 W m−2, respectively."http://onlinelibrary.wiley.com/doi/10.1029/2008GL036465/full
Akrasia wrote: » BTW, Astrophysicist Dan Lubin has been heralded around the skeptical blogosphere for the last week or two after his recent paper said that the chance of a grand minimum this century is now more than 50% The problem is, Dan Lubin is extremely critical of the types of people on these blogs who he has (accurately) described as climate change deniers and who he believes are deliberately distorting climate science in order to create doubt and uncertainty and prevent action on climate change You can see an old talk he gave to SETI a few years ago where he explains the potential impact of a reduced solar activity and near the end he gives his opinion on the 'skeptics'https://youtu.be/u2ejNl7INQM?t=40m00s
dense wrote: » The scientific community is quite clearly confused about this. On the one hand we have NASA claiming that the sun is responsible for 25% of warming in the 20th century. On the other hand we have the UNIPCC claiming that the change in measured C02 is responsible for that 25% and the rest. We also had NOAA saying there's no link between C02 and temperatures and claiming a decrease in reported temperatures. Are you now suggesting that the sun, which you previously agreed had virtually no affect, can actually significantly control temperatures?
Akrasia wrote: » I thought it was all our body heat that was warming the planet? Can't seem to stick to one story Dense? But anyway, everyone knows the sun affects our climate. Only an idiot would disagree with that. Also, only an idiot would think that the sun is the only driver of climate on our planet. The atmosphere is the reason Earth is warm, and the moon is cold, The moon and the Earth are both the same distance from the sun more or less. This is the big problem with the 'skeptic' movement. Of the small number of scientists who don't accept the established view, they can't agree amongst themselves on anything of substance and the 3% of papers that dispute the established science are full of errors and contradict each other.https://link.springer.com/article/10.1007/s00704-015-1597-5
Akrasia wrote: » Dalton and Maunder minima caused at most a half a degree in cooling. We're already at more than twice that in warming over the last 100 years, and much of that was during a time of lower than average solar activity There is no risk of another ice age as long as the increase in radiative forcing from ghgs is greater than the reduction in solar output. All the experts I have seen have said that even the worst projections of an upcoming grand solar minimum would be overpowered by even the most optimistic global warming scenarios. The biggest danger of a solar minimum is that it masks the true danger of global warming, when global warming denialists say global warming is understated while also pointing out that the sun is at reduced output. Forgetting to realise that solar cycles are temporary, so if we're still increasing global temperatures when the sun is weaker than average, we're just setting ourselves for a rapid surge in warming when the solar output recovers.
dense wrote: » Yes, it may well show that it is the sun that controls temperatures.
blanch152 wrote: » Short answer, no. Up until a few years ago, maybe, but the evidence is stacking up. As I said, hopefully, we will get lower than average solar minima which will give us a chance to correct the problem.
dense wrote: » Do you not think that this whole "C02 issue" is being over egged for the sake of mollifying activists bent on implementing wacky global "let's all be poor together" economic policies? It wasn't that long ago that NOAA was openly stating the obvious, and to my knowledge, there has been no major scientific breakthrough since then to explain how "climate experts" have now decided that there is some "issue" with C02 that requires "correcting". Bullet points added for impact.http://www.srh.noaa.gov/srh/jetstream/atmos/ll_gas.htm
blanch152 wrote: » The best we can hope for is that the Solar Minima give us more time to correct the CO2 issue.
•While carbon dioxide in the atmosphere has been increasing over the past 100 years, there is no evidence that it is causing an increase in global temperatures. •In 1997, NASA reported global temperature measurements of the Earth's lower atmosphere obtained from satellites revealed no definitive warming trend over the past two decades. In fact, the trend appeared to be a decrease in actual temperature. •The behavior of the atmosphere is extremely complex. Therefore, discovering the validity of global warming is complex as well. How much effect will the increase in carbon dioxide will have is unclear or even if we recognize the effects of any increase.
sryanbruen wrote: » I'm starting to see why predictions have been made about us going into a mini ice age that I've always been skeptical about but now I'm beginning to think so too. If we compare solar cycle 24 (2008 to present) to historical solar data, it's been the weakest solar cycle since the Glassberg minimum back in the late 1800s and early 1900s. Every solar cycle since the early 1900s was stronger than solar cycle 24 In history, there have been 3 minimums of solar activity - the Glassberg Minimum of the late 1800s and early 1900s, the Dalton Minimum of the mid to late 1700s and early 1800s, and the Maunder Minimum of the 1600s. Solar cycle data only goes back to the Dalton Minimum so does not include the Maunder Minimum. But data of other solar activity show solar activity during the Maunder Minimum was the lowest on record and that the Northern Hemisphere was having an Ice Age. There was plenty of brutal cold Winters back then - same with the Dalton Minimum but not to the extremes or frequency of the Maunder Minimum. Here's the chart showing the solar cycles and periods of solar activity. Each peak is a different solar cycle. As you can see, the latest one solar cycle 24 (which is the last one on the chart) is very weak compared to anything since the early 20th century. Notice how low activity was during Maunder Minimum. Solar Cycle 25 (should begin in 2019 or 2020) is expected to be even weaker than Solar Cycle 24. However, there are a few things that push me off of believing in these outlooks or predictions for a Mini Ice Age or severe drop off in solar activity. Time and space has changed a lot since then including warming of the planet via greenhouse gases and human activity but like I've said before, we can only compare back to a certain period so are these so called global warming records like record breaking warm years all that fascinating when you look down to the punctuation mark on the data we have? There's a lot of speculation about this in the media and I just wanted to give my opinion on the matter.
Gaoth Lag wrote: » I'm not so sure about that Isostatic rebound theory lads, are we saying that this phenomenon causes a permanent rise/sink?
Mountainsandh wrote: » But then again, isn't there a "bouncing up" effect of continents when ice melts in that manner ? That would be bound to mitigate the impact of sea level rise at least for some areas.
Gaoth Laidir wrote: » Dense, do you have the full Harvard article on US trends? If so could you send it? The abstract gives very little info.
Gaoth Laidir wrote: » Even if all the polar ice cap completely melts it won't make any difference to sea levels as it's floating ice. It's only melting land-based ice (e.g. the Greenland ice cap, Antarctic glaciers, etc.) that will affect sea levels.
dense wrote: » If the Artic is melting as never before where is the expected acceleration in sea level rise?
