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uk.sci.weather (UK Weather) (uk.sci.weather) For the discussion of daily weather events, chiefly affecting the UK and adjacent parts of Europe, both past and predicted. The discussion is open to all, but contributions on a practical scientific level are encouraged. |
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#11
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On Jun 18, 12:48*am, Jim Kewley wrote:
In message , Lawrence13 writes of the problem as the fat ugly Americans and their SUVs for a dead planet" That is an outrageous bitter nasty remark to make. People like you detest America and would leave us defencless against far darker forces. What darker forces are they Lawrence? *Interesting or wot? Pray tell us who you prefer to America and Americans? The list is long. Cheers -- Jim I'm listening |
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On Jun 18, 12:14*am, Alastair wrote:
On Jun 17, 9:42*pm, Alan LeHun wrote: In article aaa64d96-a53b-45a5-9003- , says... *What I am saying is if you wait until they are convinced that global warming is happening before we take action, then we will all end up living in caves :-( What realistic action do you think can be taken, that would make more of a difference than say a small delay in the inevietable? All this talk of 'action' is little more than pie in the sky at this stage, and probably has been for 30 years or so... -- Alan LeHun The first thing we have to do is stop burning fossil fuels like there is no tomorrow. That means going back to life like our grandfathers, who did not live in caves and were just as happy (and as miserable as Lawrence and his friends over the water) as we are :-) The second thing is we have to do is forget about growth. .Growth can only go on for so long. Resources are finite. Oil, the secret of our indolent lifestyle, is now running out. When we have used it all up, then we will have to go back to using coal. Unless we use miners (Who now would do that job?) it means oven cast mining, *i.e. destruction of mountain ranges and less agricultural land. But we need that land to feed a growing global population. We in the UK are consuming twice the productivity of the biosphere per head of population. In the USA it is three times. *As global population increases then, if our standard of living remains the same, our personal share of global resources will increase, and the others will consume more as they try to reach our standard of living. But the truth hurts, as will our readjustment, if we attempt it. But it will hurt even more if we wait for the inevitable. Cheers, (a tipsy) Alastair.- Hide quoted text - - Show quoted text - Alastair I do like you, although very passionate about AGW , you are also a gentleman. I believe you are beginning to win me over, as I was going to light a candle for you and then thought of the consequences. No seriously I do believe we humans who live in the developed countries do take energy totally for granted and if I began to believe that Co2 increase was going to be a big, big problem then I would be depressed because most people are just not responsible enough. I've had a good friend over the years and although politically I've made that journey from the left to reality he still reads his Guardian and laps up the British Bias Company we have never up until recently discussed AGW. However for the first time a couple of weeks back he raised the issue. he started going on about how we need to save finite resources and not waste energy. Now I totally agreed with this and just started to tell him how the house next door which has been converted into six flats has no washing line. He then interjected and said that he's never used a washing line for drying in his whole life. I asked why not and he said it was too much effort for him and his wife to hang the stuff out in the garden. So you see I'm being lectured about the need to save resources and yet the lecturer is far more wasteful than the person receiving the sermon. And as I said there are 7-8 mature so called sensible adults next door to me with a massive garden and not one person uses the washing line -in fact there is no washing line. Now where I work there are lots of homes in the community which are staffed and over the last twenty years I have never seen any laundry out to dry-its all done by tumble dryers and invariably the heating is on throughout the summer months let alone winter, in fact the method for cooling is to leave the heating on and open all the windows and doors -throughout the year. I have to say that in my experience the ones who tend to shout loudest about climate change are the biggest wasters of energy. Take Southwark council even when strimming local parks there workforce use petrol blowers to collect the cuttings , what's wrong with a broom yet Southwark has always been a Labour Borough and would happily increase council tax to fight climate change. And trying not to be too controversial but the biggest wasters of domestic energy tend to be immigrants who constantly feel cold and thick non working class people. So if I come across from the dark side if the evidence began to mount that Co2 was heading us for disaster then I wouldn't hold out any hope whatsoever as most couldn't care less. One more example: My mother lives under Bromley Council and is off that age when British citizens felt a sense of duty, so when Bromley Council demand recycling boy does she do that with gusto. So we get a situation where as soon a the butter has been used then the hot tap gets turned on lots of gas and then detergent so she can clean the plastic tub before it goes into the plastics bin. Great use of energy there I must say. Me though I'm a champion of energy conservation, lids on saucepan etc why I even use the hot water with which I've boiled some eggs to go towards the washing up and now some more energy conservation I'm going to shut up. |
#13
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On Jun 17, 7:40*pm, Dave Cornwell wrote:
Lawrence13 wrote: On Jun 17, 4:26 pm, Martin Brown wrote: On 17/06/2011 14:32, Tudor Hughes wrote: On Jun 17, 8:27 am, Paul *wrote: On Thu, 16 Jun 2011 at 22:24:34, duffel coat *wrote in uk.sci.weather : On 16/06/2011 10:06 PM, Dawlish wrote: You asked for an opinion. I gave you one. If you don't like it. don't ask. This is complete BS. If it isn't; show me how. * denier I bet I'm not the only GW sceptic who is tired the 'denier' label, with its hidden subtext of being almost equivalent to 'holocaust denier'. -- Paul Hyett, Cheltenham (change 'invalid83261' to 'blueyonder' to email me) * * * It depends what you're sceptical about. *If you are saying the earth has not got warmer then you are the equivalent of a flat-earther and can be dismissed instantly. *If, on the other hand, you are saying that man's contribution to this warming is less significant than the current consensus you should provide strong evidence for your view. That seems quite reasonable to me. The scientific consensus including the true sceptics (as opposed to deniers for hire) is that about half of the warming since 1850 is due to changes in insolation and the rest is due to GHG forcing which only really became significant from ~1970. I am inclined to the view that some of the very steep rise seen in the last three decades of the twentieth century was at least partly due to a periodic component with a period of about 60 years (hence the small peaks at 1940 and 1880 in HADCRUT). However we are now on the downside of that periodic term and temperatures are still holding up. So despite the fact that I do think AGW is both real and a potential long term threat to civilisation I also believe that extrapolating from the very steep rise in the 1970-2000 period exaggerates the problem. Frankly, you are not in a position to do so. *Neither am I and nor is almost everyone else on this group; it's a very technical subject, not a belief or philosophy. *The only scepticism one can justify is to query some of the doom-laden predictions one reads in the press because these are nearly always made by people with little knowledge of the subject. Tudor Hughes, Warlingham, Surrey. The hair shirt greens who want us living in caves are as much a part of the problem as the fat ugly Americans and their SUVs for a dead planet.. Both extremes insist that they are right and make wild predictions. Regards, Martin Brown- Hide quoted text - - Show quoted text - "The hair shirt greens who want us living in caves are as much a part of the problem as the fat ugly Americans and their SUVs for a dead planet" That is an outrageous bitter nasty remark to make. People like you detest America and would leave us defencless against far darker forces. Pray tell us who you prefer to America and Americans? ---------------------- I'd quite like to stake a claim for the Scandinavians - they never get on their High horse these days. Dave I have to say I don't have any problem with the USA or Americans on this, it's more an issue with conservatives with ulterior motives across the globe. Given how true-blue southern England is, much more so than many parts of the USA to be honest (Denver, which I'm visiting later this year, appears to be - in governance - significantly more left-leaning than my home town of Southampton, now sadly a Tory stronghold but I won't go into a long rant about that and its effects...) I don't think we can single out America as a whole. Nick |
#14
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On Sat, 18 Jun 2011 04:48:39 -0700, Lawrence13 wrote:
Alastair I do like you, although very passionate about AGW , you are also a gentleman. I believe you are beginning to win me over, as I was going to light a candle for you and then thought of the consequences. Nice one! I was just typing a response to say how worried I was that I agreed with with almost everything you said in your reply to Alastair when the circuit-breaker cut the power and shut down the PC, Seems you have critics everywhere, Lawrence, even in the inanimate world. -- Graham Davis, Bracknell Whilst it's true that money can't buy you happiness, at least you can be miserable in comfort. |
#15
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On Jun 18, 1:54*pm, Nick wrote:
On Jun 17, 7:40*pm, Dave Cornwell wrote: Lawrence13 wrote: On Jun 17, 4:26 pm, Martin Brown wrote: On 17/06/2011 14:32, Tudor Hughes wrote: On Jun 17, 8:27 am, Paul *wrote: On Thu, 16 Jun 2011 at 22:24:34, duffel coat *wrote in uk.sci.weather : On 16/06/2011 10:06 PM, Dawlish wrote: You asked for an opinion. I gave you one. If you don't like it. don't ask. This is complete BS. If it isn't; show me how. * denier I bet I'm not the only GW sceptic who is tired the 'denier' label, with its hidden subtext of being almost equivalent to 'holocaust denier'. -- Paul Hyett, Cheltenham (change 'invalid83261' to 'blueyonder' to email me) * * * It depends what you're sceptical about. *If you are saying the earth has not got warmer then you are the equivalent of a flat-earther and can be dismissed instantly. *If, on the other hand, you are saying that man's contribution to this warming is less significant than the current consensus you should provide strong evidence for your view. That seems quite reasonable to me. The scientific consensus including the true sceptics (as opposed to deniers for hire) is that about half of the warming since 1850 is due to changes in insolation and the rest is due to GHG forcing which only really became significant from ~1970. I am inclined to the view that some of the very steep rise seen in the last three decades of the twentieth century was at least partly due to a periodic component with a period of about 60 years (hence the small peaks at 1940 and 1880 in HADCRUT). However we are now on the downside of that periodic term and temperatures are still holding up. So despite the fact that I do think AGW is both real and a potential long term threat to civilisation I also believe that extrapolating from the very steep rise in the 1970-2000 period exaggerates the problem. Frankly, you are not in a position to do so. *Neither am I and nor is almost everyone else on this group; it's a very technical subject, not a belief or philosophy. *The only scepticism one can justify is to query some of the doom-laden predictions one reads in the press because these are nearly always made by people with little knowledge of the subject. Tudor Hughes, Warlingham, Surrey. The hair shirt greens who want us living in caves are as much a part of the problem as the fat ugly Americans and their SUVs for a dead planet. Both extremes insist that they are right and make wild predictions. Regards, Martin Brown- Hide quoted text - - Show quoted text - "The hair shirt greens who want us living in caves are as much a part of the problem as the fat ugly Americans and their SUVs for a dead planet" That is an outrageous bitter nasty remark to make. People like you detest America and would leave us defencless against far darker forces. Pray tell us who you prefer to America and Americans? ---------------------- I'd quite like to stake a claim for the Scandinavians - they never get on their High horse these days. Dave I have to say I don't have any problem with the USA or Americans on this, it's more an issue with conservatives with ulterior motives across the globe. Given how true-blue southern England is, much more so than many parts of the USA to be honest (Denver, which I'm visiting later this year, appears to be - in governance - significantly more left-leaning than my home town of Southampton, now sadly a Tory stronghold but I won't go into a long rant about that and its effects...) I don't think we can single out America as a whole. Nick- Hide quoted text - - Show quoted text - Denver is a wonderful city. *)) Very different to many other Americal cities too. You are right; to single out Americans would be unfair, as they, through their president, have the major say in CO2 changes ATM (China and India soon) and they are carefully leading the world and doing it reasonably well. The appalling tactics of some Americans, reflected in some in this country and other countries, tries to hold that back, for a multitude of often nefarious reasons. Few of those reasons are connected to science. |
#16
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On 17/06/2011 18:48, Graham P Davis wrote:
On Fri, 17 Jun 2011 16:26:40 +0100, Martin Brown wrote: On 17/06/2011 14:32, Tudor Hughes wrote: It depends what you're sceptical about. If you are saying the earth has not got warmer then you are the equivalent of a flat-earther and can be dismissed instantly. If, on the other hand, you are saying that man's contribution to this warming is less significant than the current consensus you should provide strong evidence for your view. That seems quite reasonable to me. The scientific consensus including the true sceptics (as opposed to deniers for hire) is that about half of the warming since 1850 is due to changes in insolation and the rest is due to GHG forcing which only really became significant from ~1970. Could you point me to some references? My impression was that the consensus was that changes in insolation were fairly small and had had little effect on temperature. Also, I don't see how insolation can have warmed the tropopshere yet cooled the higher atmosphere. That cooling was only predicted by CO2 theory as far as I know. It can't. Both effects are present to varying degrees at different times - for most of this period the effect of GHG forcing was almost negligible. It is only in the last half century that AGW and GHG forcings *have* had to be included to make the energy equations balance. Satellite data constrain the wilder fantasies of hand waving rightards who want to magic the sun brighter and deny AGW. Baliunas & Soon 1996 is one of the better Solar Irradiance Variability papers and the references therein provide additional background. http://iopscience.iop.org/0004-637X/.../34083.web.pdf Note that they are sceptics but their attempts to show it is only the suns output changing do not stand up to the experimental data. Solar activity was high during the post-war period when slight cooling of the troposphere occurred and during the early part of the rise from 1970 to around '85 but has been falling slowly since then. I find it hard to see much correlation between solar activity and temperature changes. Correlation models do seem to find enough of one to explain a decent proportion of the climate variability (but not all and in particular they become a very bad fit after about 1970). NB Baliunas & Soon are sceptics but at least in the scientific literature they are honest (something which is not guaranteed elsewhere). I am inclined to the view that some of the very steep rise seen in the last three decades of the twentieth century was at least partly due to a periodic component with a period of about 60 years (hence the small peaks at 1940 and 1880 in HADCRUT). However we are now on the downside of that periodic term and temperatures are still holding up. I took an interest in climate cycles around forty years ago but don't recall a 60-yr cycle. A large study of cycles published in 1975 had a 100- yr cycle peaking near 1940 but nothing shorter. Other research I heard of in the late 60s also found 100-yr cycles, both globally and locally. From these, we were supposed to cool globally until 1990 and the UK was supposed to experience cold springs from 1970 to 2020. In my experience, cycles are relatively easy to see in past data but are really unreliable when extrapolated into the future. That is always a risk. However there are several driving forces in oceanic circulation that can behave as powerful heat shunts and go by the unappealing name of Multidecadal oscillations. The big ones being in the Atlantic and Pacific oceans. eg. http://en.wikipedia.org/wiki/Atlanti...al_oscillation and http://en.wikipedia.org/wiki/Pacific...al_oscillation Will do as an introduction. There is a roughly 60 year slow component and a lot of "noise" by which I mean unexplained variance. There is much haggling over the root cause. So despite the fact that I do think AGW is both real and a potential long term threat to civilisation I also believe that extrapolating from the very steep rise in the 1970-2000 period exaggerates the problem. I haven't extrapolated that temperature rise. However, I have used a 1980 prediction of the likely effect of doubling CO2 in the atmosphere. The graph of the predicted rise is a reasonable match to that which has occurred. It's certainly better than the prediction from climate cycles. ;-) See http://tinyurl.com/66jsa5k Whose model is that? They are clearly barking up the wrong lamp post! (and most likely they think it is a tree) Regards, Martin Brown |
#17
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On 17/06/2011 19:10, Lawrence13 wrote:
On Jun 17, 4:26 pm, Martin wrote: The hair shirt greens who want us living in caves are as much a part of the problem as the fat ugly Americans and their SUVs for a dead planet. Both extremes insist that they are right and make wild predictions. Regards, Martin Brown- Hide quoted text - - Show quoted text - "The hair shirt greens who want us living in caves are as much a part of the problem as the fat ugly Americans and their SUVs for a dead planet" That is an outrageous bitter nasty remark to make. It happens to be true. There is a large supply of fat ugly Americans that eat massive amounts of junk food, take no exercise with about a third of them now clinically obese and a third merely overweight. A nation full of lazy fat slobs that refuse even to look after their own bodies can hardly be expected to care about the health of the planet. http://www.reuters.com/article/2009/...50863H20090109 Fit lean people are now in a minority in the USA. There are harder line opinions on the state of Americans waistlines even in the USA for example the most extreme view that people like Beck on Fox News takes : http://mediamatters.org/mmtv/201009140042 (starts from about half way through the clip) People like you detest America and would leave us defencless against far darker forces. America is a bimodal population - there are some lean fit Americans and I would far rather that they represented the USA in military matters. Pray tell us who you prefer to America and Americans? I have nothing against reasonable Americans. It is the pathological lying Neocons, Young Earth Creationists and Tea Party nutters that I really have it in for (ie most of the Republican party). I am not that impressed with Obama either - note how quickly he attacked *BRITISH* Petroleum (aka BP) for the oil spill to deflect criticism from his own administration. So much for the "special" relationship (now rebranded "essential" as in "no choice"). Regards, Martin Brown |
#18
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On Jun 20, 10:05*am, Martin Brown
wrote: On 17/06/2011 19:10, Lawrence13 wrote: On Jun 17, 4:26 pm, Martin wrote: The hair shirt greens who want us living in caves are as much a part of the problem as the fat ugly Americans and their SUVs for a dead planet.. Both extremes insist that they are right and make wild predictions. Regards, Martin Brown- Hide quoted text - - Show quoted text - "The hair shirt greens who want us living in caves are as much a part of the problem as the fat ugly Americans and their SUVs for a dead planet" That is an outrageous bitter nasty remark to make. It happens to be true. There is a large supply of fat ugly Americans that eat massive amounts of junk food, take no exercise with about a third of them now clinically obese and a third merely overweight. A nation full of lazy fat slobs that refuse even to look after their own bodies can hardly be expected to care about the health of the planet. http://www.reuters.com/article/2009/...a-idUSTRE50863... Fit lean people are now in a minority in the USA. There are harder line opinions on the state of Americans waistlines even in the USA for example the most extreme view that people like Beck on Fox News takes : http://mediamatters.org/mmtv/201009140042 (starts from about half way through the clip) I agree whole heartedly with the Obama remarks. The most left wing American administration possibly ever were like the labour party did with the fox hunting bill-trying to bash Britain (NOT BP) and appeal to environmentalists left lobby (anti oil) and dress it up as American patriotism (war of independence). Truth is the moratorium on(unsafe environmentally damaging) deep water off shore oil drilling in the gulf has only served to lose tens of thousands of jobs and help push up fuel prices in the US. Ironically the Obama regime then invested 2 billion dollars in unsafe environmentally dangerous deep water off- shore oil drilling in Brazil. Now back to your generalised sweeping comments about the US: Having once been on the left side of life it went without saying that you hated America with a passion they were worse than China, Russia, North Korea let alone Iraq, Iran and hosts of almost hundreds of oppressive regimes around the world. I often meet west Africans Ghanaians and Nigerians in particular who will readily run down the US while waiting and hoping to immigrate there I mean even Muslims want to live there in the bosom of the great Satan. By the way I love the tea party movement and what it stands for 'smaller government, more personal responsibility and a massive reduction in government debt which currently stands at 14 trillion dollars and rising the currency is being devalued at an alarming rate with and is heading for a crisis which if comes to pass will satisfy every AGW with a world economic implosion causing far more damage to the windmills of the AGW's minds ever thought possible as a result of AGW. Just one last point: as you so crudely put it: . "There is a large supply of fat ugly Americans that eat massive amounts of junk food, take no exercise with about a third of them now clinically obese and a third merely overweight. A nation full of lazy fat slobs that refuse even to look after their own bodies can hardly be expected to care about the health of the planet." So this applies to most Americans? We know that there is this problem in a country where food has been historically cheap. But how does that compare with some other countries some of which are supposedly at risk from greedy America's co2 output threatening their sea levels. Actually the BBC did a documentary some several years ago about the islands of Tuvalu which represents some of the lowest inhabited at risk populated islands in the world. I remember the serious faced concerned presenter amongst flashes of George Bush and the American car industry being flashed on the screen whilst he spoke of the islands being submerged not too long in the future. And then we met the islanders who were very rich (holiday trade) and were all morbidly obese (hate that term) and get this........drove massive big four wheel cars on islands you could walk around in twenty minutes!!!!!!! Of course that irony was lost on the BBC, as it was totally obscured by its massive anti American agenda But moving onto obesity and your hatred of America due to its fatgitism lets compare to the fatty list 1 Nauru 94.5 2. Micronesia, Federated States of 91.1 3. Cook Islands 90.9 4. Tonga 90.8 5. Niue 81.7 6. Samoa 80.4 7. Palau 78.4 8. Kuwait 74.2 9. United States 74.1 By the way Britain is in 27th place at just 10% lower rate of population . So on the basis of that those countries higher in obesity rates than America deserve our contempt and hatred . Let's stay with America though as you hate the Tea Party and the fact they are all fat useless slobs. I can only guess from your remarks that all tea party members are overweight, white and right-wing, Well the highest obesity rates in the US are amongst blacks and Hispanics " Blacks had 51% higher and Hispanics had 21% higher rates of obesity." http://trialx.com/curetalk/2011/03/o...wing-epidemic/ So Martin based on weight issues you hate the black and Hispanic population and purely based on politics and they are that you hate the tea party movement and America full stop due to you very left wing view of the world. Just to conclude: Criticism of Americans being overweight, now what did you say, ah yes " A nation full of lazy fat slobs that refuse even to look after their own bodies can hardly be expected to care about the health of the planet." And of course when Scotland gets independence they'll lead by example from the land of the fried mars bar. See below an ' inconvenient haggis' http://www.telegraph.co.uk/news/ukne...r-obesity.html People like you detest America and would leave us defencless against far darker forces. America is a bimodal population - there are some lean fit Americans and I would far rather that they represented the USA in military matters. Pray tell us who you prefer to America and Americans? I have nothing against reasonable Americans. It is the pathological lying Neocons, Young Earth Creationists and Tea Party nutters that I really have it in for (ie most of the Republican party). I am not that impressed with Obama either - note how quickly he attacked *BRITISH* Petroleum (aka BP) for the oil spill to deflect criticism from his own administration. So much for the "special" relationship (now rebranded "essential" as in "no choice"). Regards, Martin Brown- Hide quoted text - - Show quoted text - |
#19
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On Mon, 20 Jun 2011 09:24:44 +0100, Martin Brown wrote:
I am inclined to the view that some of the very steep rise seen in the last three decades of the twentieth century was at least partly due to a periodic component with a period of about 60 years (hence the small peaks at 1940 and 1880 in HADCRUT). However we are now on the downside of that periodic term and temperatures are still holding up. I took an interest in climate cycles around forty years ago but don't recall a 60-yr cycle. A large study of cycles published in 1975 had a 100- yr cycle peaking near 1940 but nothing shorter. Other research I heard of in the late 60s also found 100-yr cycles, both globally and locally. From these, we were supposed to cool globally until 1990 and the UK was supposed to experience cold springs from 1970 to 2020. In my experience, cycles are relatively easy to see in past data but are really unreliable when extrapolated into the future. That is always a risk. However there are several driving forces in oceanic circulation that can behave as powerful heat shunts and go by the unappealing name of Multidecadal oscillations. The big ones being in the Atlantic and Pacific oceans. eg. http://en.wikipedia.org/wiki/Atlanti...al_oscillation and http://en.wikipedia.org/wiki/Pacific...al_oscillation Will do as an introduction. There is a roughly 60 year slow component and a lot of "noise" by which I mean unexplained variance. There is much haggling over the root cause. Yes, Id forgotten that interpretation of the PDO. Probably because I keep trying to forget it but keep being reminded. I just wish everyone else would forget it. ;-) When I first came across it, I couldn't understand how anyone could say that there was a 60-yr cycle when they only had 92 years of data. I wouldn't blame the original researchers as I recall that cycle was advertised by some Professor with an axe to grind who wanted us to believe that the PDO was about to go into a cold phase for 30 years. I was also a little doubtful about the "Reconstructed PDO." I've not been a great fan of relating tree rings to temperature even when they're for the same place so I thought this was pushing the boat out too far - into the middle of the N Pacific in fact. They say there was a good fit in the overlap with the PDO and whilst that is true for 1940-90, it's no match at all from 1900-30. So despite the fact that I do think AGW is both real and a potential long term threat to civilisation I also believe that extrapolating from the very steep rise in the 1970-2000 period exaggerates the problem. I haven't extrapolated that temperature rise. However, I have used a 1980 prediction of the likely effect of doubling CO2 in the atmosphere. The graph of the predicted rise is a reasonable match to that which has occurred. It's certainly better than the prediction from climate cycles. ;-) See http://tinyurl.com/66jsa5k Whose model is that? They are clearly barking up the wrong lamp post! (and most likely they think it is a tree) The work on climate cycles was published in 1975 by GARP (Global Atmospheric Research Project). It was based on 700,000 years of data and studies by the best climatologists of the time, including H H Lamb. It was meant to be a guide to future climate. I've lost the link for the moment but will try and get it for you. If work on climate cycles based on 700,000 years of data goes tits up as soon as it is published, what chance is there for one based on 92 years data? Thanks for the Solar Irradiance link. I'll -- Graham Davis, Bracknell Whilst it's true that money can't buy you happiness, at least you can be miserable in comfort. |
#20
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On Jun 20, 7:06*pm, Graham P Davis wrote:
On Mon, 20 Jun 2011 09:24:44 +0100, Martin Brown wrote: I am inclined to the view that some of the very steep rise seen in the last three decades of the twentieth century was at least partly due to a periodic component with a period of about 60 years (hence the small peaks at 1940 and 1880 in HADCRUT). However we are now on the downside of that periodic term and temperatures are still holding up. I took an interest in climate cycles around forty years ago but don't recall a 60-yr cycle. A large study of cycles published in 1975 had a 100- yr cycle peaking near 1940 but nothing shorter. Other research I heard of in the late 60s also found 100-yr cycles, both globally and locally. From these, we were supposed to cool globally until 1990 and the UK was supposed to experience cold springs from 1970 to 2020. In my experience, cycles are relatively easy to see in past data but are really unreliable when extrapolated into the future. That is always a risk. However there are several driving forces in oceanic circulation that can behave as powerful heat shunts and go by the unappealing name of Multidecadal oscillations. The big ones being in the Atlantic and Pacific oceans. eg. http://en.wikipedia.org/wiki/Atlanti...oscillationand http://en.wikipedia.org/wiki/Pacific...al_oscillation Will do as an introduction. There is a roughly 60 year slow component and a lot of "noise" by which I mean unexplained variance. There is much haggling over the root cause.. Yes, Id forgotten that interpretation of the PDO. Probably because I keep trying to forget it but keep being reminded. I just wish everyone else would forget it. *;-) When I first came across it, I couldn't understand how anyone could say that there was a 60-yr cycle when they only had 92 years of data. I wouldn't blame the original researchers as I recall that cycle was advertised by some Professor with an axe to grind who wanted us to believe that the PDO was about to go into a cold phase for 30 years. I was also a little doubtful about the "Reconstructed PDO." I've not been a great fan of relating tree rings to temperature even when they're for the same place so I thought this was pushing the boat out too far - into the middle of the N Pacific in fact. They say there was a good fit in the overlap with the PDO and whilst that is true for 1940-90, it's no match at all from 1900-30. So despite the fact that I do think AGW is both real and a potential long term threat to civilisation I also believe that extrapolating from the very steep rise in the 1970-2000 period exaggerates the problem. I haven't extrapolated that temperature rise. However, I have used a 1980 prediction of the likely effect of doubling CO2 in the atmosphere.. The graph of the predicted rise is a reasonable match to that which has occurred. It's certainly better than the prediction from climate cycles. *;-) Seehttp://tinyurl.com/66jsa5k Whose model is that? They are clearly barking up the wrong lamp post! (and most likely they think it is a tree) The work on climate cycles was published in 1975 by GARP (Global Atmospheric Research Project). It was based on 700,000 years of data and studies by the best climatologists of the time, including H H Lamb. It was meant to be a guide to future climate. I've lost the link for the moment but will try and get it for you. If work on climate cycles based on 700,000 years of data goes tits up as soon as it is published, what chance is there for one based on 92 years data? Thanks for the Solar Irradiance link. I'll -- Graham Davis, Bracknell Whilst it's true that money can't buy you happiness, at least you can be miserable in comfort.- Hide quoted text - - Show quoted text -- Hide quoted text - - Show quoted text - I agree about the PDO Graham, but Roy Spencer still gives a lot of credence to it - not that I give that much credence to his attempts to downgrade the possible effects of CO2 on climate at every opportunity. http://www.drroyspencer.com/ If you scroll down far enough you'll find it, as well as quite a few other ways that CO2 can't be responsible for warming. He's missed out his wholly scientific views on creation though. Shame. |
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