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Author Topic:   Global Warming... fact, fiction, or a little of both?
Silent H
Member (Idle past 5840 days)
Posts: 7405
From: satellite of love
Joined: 12-11-2002


Message 106 of 113 (246874)
09-28-2005 4:40 AM


Latest updates on Causes and Effects...
Here are some interesting new items within the arena of climate change...
Greenhouse gases have increased 20 percent since 1990. Current index is now 1.2, from a baseline of 1.0 arbitrarily set at 1990.
"This index provides us with a valuable benchmark for tracking the composition of the atmosphere as we seek to better understand the dynamics of Earth's climate," said NOAA Administrator Conrad C. Lautenbacher, Jr.
In the current reading, for every million air molecules there are about 375 carbon dioxide molecules, two are methane and less than one is a nitrous oxide molecule. The CFC's make up less than one molecule in a billion in the atmosphere but play a role in regulating Earth's climate and are a key factor in the depletion of the protective ozone layer, NOAA researchers say.
What is the consensus regarding the impact of this growth within the climatological community?
They say that while temps are rising (with GHGs being partly responsible), which may result in more unpredictable (varied) weather, the connection to current weather is not certain, and not beyond natural variabillity at all.
"Global warming, I think, is playing a role in the hurricanes," said Kevin Trenberth, a senior scientist at the National Center for Atmospheric Research in Boulder, Colorado.
"But a lot of what is going on is natural. What global warming may be doing is making them somewhat more intense," said Trenberth, a member of the U.N. Intergovernmental Panel on Climate Change.
James Elsner, professor of geography at Florida State University, agreed.
"Certainly this is an unusual season," he said in a telephone interview. "However, the question of attribution I don't think is very simple."
..."We have seen unusual seasons in the past and so we understand that we tend to see more strong storms when the Atlantic Ocean temperatures are warmer, which has been the case in the last 10 years or so," Elsner said.
"It was warm in the 1940s and '50s and we saw lots of strong storms during that period."
So far, 2005 has not been the busiest year for storms, even though there have been 17 named tropical storms in the Atlantic, Caribbean and Gulf of Mexico.
"That distinction belongs to the year 1933, in which there were 21 storms that reached tropical storm strength," said Eric Gross, an associate professor of history at Harding University in Searcy, Arkansas, who studies hurricanes and other natural disasters.
There were 19 tropical storms in 1995, Gross said in a statement.
While certainly the year is not out, we can see that in times before climate change was even a possibility we had busier years storm wise. We even had some really bad storms in the 40-50s, despite that being globally cooler (the region was hotter).
I showed in an earlier post that this sort of event (two major hurricanes hitting that specific region of the US) was not unheard of, well before climate change. This amplifies that earlier historic record. This is one reason I have stressed how important it is to have a strong record, before making statements regarding current weather.
Okay, what about all that wacky weather Europe has been feeling?
Scientists suggest the recent droughts and floods are also not suggestive of anything beyond natural causes.
... as far as the droughts and floods are concerned, climate scientists have found it more difficult to find long-term trends in rainfall.
European weather is affected by a climate system called the North Atlantic Oscillation. This describes changes in atmospheric pressure at sea level as measured over Iceland and over the Azores.
"Over the last 50 years or so, there's been a trend to lower pressures over Iceland and higher pressures over the Azores in winter," said Dr Haylock.
The impact of this climate system reaches from the upper atmosphere to the bottom of the ocean.
But its most obvious impact over the last half century is a trend towards drier conditions in southern Europe and more extreme rainfall in northern Europe during winter.
Its effects during other seasons, such as summer, are not as clear. Local weather systems seem to play a larger role here.
Interesting.
This message has been edited by holmes, 09-28-2005 04:41 AM

holmes
"...what a fool believes he sees, no wise man has the power to reason away.."(D. Bros)

  
RAZD
Member (Idle past 1425 days)
Posts: 20714
From: the other end of the sidewalk
Joined: 03-14-2004


Message 107 of 113 (247435)
09-29-2005 8:20 PM


Polar Ice Caps
The story heats up again with a new study out on the polar ice caps.
from Time magazine
Page not found | TIME
Even as debate continues about the role global warming has played in the recent burst of violent hurricanes, more bad news on the climate front emerged today from a decidedly untropical part of the world: the Arctic. According to a study sponsored by the National Snow and Ice Data Center (NSIDC) and other groups, the Arctic ice sheet”a frozen expanse measuring millions of square miles”is shrinking faster than was previously thought. At the current rate it could melt away to nothing before the end of the century.
What's more, if melting worsens global warming, and global warming is widely believed to have helped fuel the killer hurricanes, all the other dangers associated with higher temperatures”from droughts to crop failures to the migration of tropical diseases”start to look more real.
The question, as always, is whether all of this is a part of natural cycling, or whether the greenhouse gasses we produce in such abundance have simply busted a fragile system. Ocean temperatures historically run in cycles, with shifting currents carrying warmth to different parts of the world at different times. But the planet's own metabolism and the damage we do to it with our industrial exhausts don't exist separately. Greenhouse emissions undeniably raise global temperatures. Whether we're entirely responsible for the loss of Arctic ice or only exacerbating a natural phenomenon, now is the time to dial down the gasses. The planet”as Katrina and Rita showed”knows how to hit back.
I think I hit the more "sensationalistic" quotes.
This still brings me to the point that the climate is changing and whether we like it or not,
and that the question is whether it will affect us adversely or not, and whether we can do anything about it.
Claiming that "global warming is not happening" does not answer this question, nor does saying "global warming causes Katrina" answer the question, nor does saying {X} is a looney answer the question.
Enjoy.

we are limited in our ability to understand
by our ability to understand
RebelAAmerican.Zen[Deist
... to learn ... to think ... to live ... to laugh ...
to share.

Replies to this message:
 Message 108 by Silent H, posted 09-30-2005 5:48 AM RAZD has replied

  
Silent H
Member (Idle past 5840 days)
Posts: 7405
From: satellite of love
Joined: 12-11-2002


Message 108 of 113 (247548)
09-30-2005 5:48 AM
Reply to: Message 107 by RAZD
09-29-2005 8:20 PM


Re: Polar Ice Caps
I think I hit the more "sensationalistic" quotes.
Yeah, this furthers the point of this thread quite well. The following two hysterics, leading to a conclusion based on an open question, punctuated with a threat, is exactly what I was talking about...
if melting worsens global warming, and global warming is widely believed to have helped fuel the killer hurricanes, all the other dangers associated with higher temperatures”from droughts to crop failures to the migration of tropical diseases”start to look more real.
This makes me want to beat the shit out of someone. Like other hurricanes in the past were less "Killers" than these, which incidentally did not kill more people, broken levees from poor management leading to flooding did. And droughts, crop failures, and the migration of tropical diseases does not look real at this point in time, nor have they done so in the past?
The hyperbole in that quote is surpassed only by its ignorance and ethnocentrism. I also liked the "widely believed" quote, never mind that it is in the same context as Iraq was widely believed to have been responsible for 911.
Greenhouse emissions undeniably raise global temperatures. Whether we're entirely responsible for the loss of Arctic ice or only exacerbating a natural phenomenon, now is the time to dial down the gasses. The planet”as Katrina and Rita showed”knows how to hit back.
Remember this lesson, whether you fully understand what is happening or what you can do regarding an issue, use a scary monster to encourage everyone to start swinging wildly in the air.
I wonder if this author really thought it is as easy as just "turning down" a knob, like we simply set the thermostat too high.
and that the question is whether it will affect us adversely or not, and whether we can do anything about it.
This is my view on this question... The climate is changing. It always has and it always will. I don't like heat so much, and I like glaciers, so aesthetically the world is not going in the direction I want.
With globalization the spread of diseases has been crossing the world regardless of temps. I think this is a really bogus reason to be worried about GHGs or disease. In fact this is such an important issue all on its own, and I think we have shown ourselves incapable of handling it in ways worse than the Katrina negligence.
Droughts are important, but again have occured on massive scales in the past. Dealing with them is an issue we should be concerning ourselves with regardless of climate change.
Sea level rise is not that big an issue to me. It can change geography, but geography changes all the time for many many different reasons. Coastal engineering is a solid profession. I live where I do thanks solely to it. I can walk over (in fact I will today) to a standing column of water (in a glass tube) showing exactly how high the water should be here, and how high it could get. I think its 1/3 of this nation is reclaimed seafloor.
Some islands may be permanently effected. But again, knowing geology, eventually those islands would be faced with that problem anyway. Islands don't grow, unless they have volcanic activity. And if they have such activity then sea level rise will likely not effect them in ways that cannot be manage with coastal engineering.
Maybe having lived in tornado alley for most of my life makes me not so worried about storms. Especially if frequency and top intensity is not altered. The question then would be about building properly against storms. They are unlikely to hurt us in a catastrophic way, and no much worse than they have in the past.
And these are essentially the worse case scenarios we are looking at toward the middle/end of the century, not right now. On the other hand we also have no idea what course nature might take during that time regardless of GHGs.
Extinction events have happened more than once on this planet without man's effects. Thus we should be planning for how to deal with the things which might effect us regardless of GHGs.
The possibility that GHGs could bring on an extinction event is unlikely, but as you say, can bring changes we might not want... aesthetically and economically.
More importantly to me, using fossil fuels has greater immediate and direct consequences on quality of life, as well as indirect effects like political/economic instability from foreign controlled fuel supplies.
As an energy source its like a crutch we've been using so long we forgot that with a little extra work we could be free of it and more mobile to boot.
But this is addressing the point you wanted to make. The point of this thread was twofold, to examine the actual state of scientific evidence regarding climate change, and in that process to examine how we are treating science when it impacts a political/emotional issue.
Just as in the sexual themed threads, or EvC ones, what seems to happen is there is a rush to discuss implications toward policy and to make sure ethical/political ideas are kept in mind and reinforced, rather than discussing what we know and what is good science.
More troubling to me than climate change, is the lack of concern for good science. Without it we are doomed to ignorance for a long time and many more bad decisions, and from my vantage point this is coming from all sides including those who are on the E side of the EvC debate.
This raises the question of how important good science is to the majority, regardless of religious persuasion? Will it generally be sacrificed to emotional/political causes? If so, what is the true nature or utility of science? What can be said about knowledge?
Heheheh... I'm trying to uncover the effects of man on the intellectual climate.

holmes
"...what a fool believes he sees, no wise man has the power to reason away.."(D. Bros)

This message is a reply to:
 Message 107 by RAZD, posted 09-29-2005 8:20 PM RAZD has replied

Replies to this message:
 Message 109 by RAZD, posted 10-12-2005 5:25 PM Silent H has replied

  
RAZD
Member (Idle past 1425 days)
Posts: 20714
From: the other end of the sidewalk
Joined: 03-14-2004


Message 109 of 113 (251238)
10-12-2005 5:25 PM
Reply to: Message 108 by Silent H
09-30-2005 5:48 AM


Re: Polar Ice Caps
This site was given a Science and Technology Award by SciAM:
RealClimate: Frontpage
From my cursory reading I think you will see some real discussion of this issues here (including "other forcings").
Enjoy.

we are limited in our ability to understand
by our ability to understand
RebelAAmerican.Zen[Deist
... to learn ... to think ... to live ... to laugh ...
to share.

This message is a reply to:
 Message 108 by Silent H, posted 09-30-2005 5:48 AM Silent H has replied

Replies to this message:
 Message 111 by Silent H, posted 10-13-2005 4:59 AM RAZD has not replied

  
bkelly
Inactive Member


Message 110 of 113 (251253)
10-12-2005 6:03 PM
Reply to: Message 19 by Silent H
09-14-2005 6:02 AM


Salt indeed has a say
I know this is a bit old now, but,...
holmes writes:
Okay here's the problem. Cold water sinks while warm water stays on top. It is true that salinity has its say, but there is no definitive concept that fresh water will not mix and so stay around to block incoming gulf currents.
Salinity is increcibly important in the oceanic conveyer. As the water in the artic freezes, the salt is squeezed out and the remaining brine is very cold and salty. That make is significantly heaver than other waters. It sinks and begins a trip around the world that make take a thousand years or more. This conveyer absorbs and gives off huge amounts of energy. Since it takes so long to circulate, it moderates the climate.
Note also that cold salty water does not readily mix with warmer fresher water. That is what enables this oceanic current to remain coherent in its incredibly long journey. And yes, this is known and verified.
I don't remember where, but I read an evaluation about the end of one of the ice ages. That essay said that at one point, an ice dam broke and a huge lake on the North American continent poured into the Atlantic ocean. All that fresh water disrupted the oceanic current. The result was extreme climate changes for the thousands of years that it took for the oceanic current to be restored.
While I did not find the one I remembered, here is one of many web sites:
http://www.soc.soton.ac.uk/.../general_science/conveyor.html
I am not weighing in on one side of the debate or the other, just emphasizing the importance of this aspect.

This message is a reply to:
 Message 19 by Silent H, posted 09-14-2005 6:02 AM Silent H has replied

Replies to this message:
 Message 112 by Silent H, posted 10-13-2005 5:09 AM bkelly has not replied

  
Silent H
Member (Idle past 5840 days)
Posts: 7405
From: satellite of love
Joined: 12-11-2002


Message 111 of 113 (251374)
10-13-2005 4:59 AM
Reply to: Message 109 by RAZD
10-12-2005 5:25 PM


Re: Polar Ice Caps
From my cursory reading I think you will see some real discussion of this issues here (including "other forcings").
I believe that was where some of the data I was refering to came from, including cites within my own posts. I know I had obtained some of them there originally.
However, I am not very keen on that site at all. It certainly does have a bias and the owner is prone to uhmmmm... mistatements?... which he will not admit to when it is pointed out. His incredibly fictitious review of Crichton's book... okay let's be honest that this guy is lying. He is either lying that he read it, or lying about what is in it.
When a person can't tell the truth about a fictional novel, the question of how factual he'll be regarding other things is raised.
Many followers of that site followed suit. He was also clearly following a double standard in allowing in content which he said he does not allow, if and when it suited his own cause.
This "award" does not impress me about the site, so much as depresses me about SciAm. The best that can be said is you get some links to more up to date data and discussion of the data.
You will not find anything that contradicts what I have said there, and if I remember right the site owner is critical of "ice age" theories.

holmes
"...what a fool believes he sees, no wise man has the power to reason away.."(D. Bros)

This message is a reply to:
 Message 109 by RAZD, posted 10-12-2005 5:25 PM RAZD has not replied

  
Silent H
Member (Idle past 5840 days)
Posts: 7405
From: satellite of love
Joined: 12-11-2002


Message 112 of 113 (251376)
10-13-2005 5:09 AM
Reply to: Message 110 by bkelly
10-12-2005 6:03 PM


Re: Salt indeed has a say
That essay said that at one point, an ice dam broke and a huge lake on the North American continent poured into the Atlantic ocean. All that fresh water disrupted the oceanic current. The result was extreme climate changes for the thousands of years that it took for the oceanic current to be restored.
That is a different scenario than what we were discussing. It is more rapid and the result was not an ice age.
The question here was regarding the rather slower melting of ice into the ocean would not allow some mixing, and whether disruption of a current could effect temperatures in so great a fashion as to cause an ice age.
That currents could be blocked to some degree, or effect climate to some degree is not what I meant to be challenging. Just the extreme blocking and effects.
I agree completely that cold salty water does not readily mix with warm fresh water. Currents and layers based solely on salinity and temp exist within the ocean.

holmes
"...what a fool believes he sees, no wise man has the power to reason away.."(D. Bros)

This message is a reply to:
 Message 110 by bkelly, posted 10-12-2005 6:03 PM bkelly has not replied

  
bgmark2
Member (Idle past 6178 days)
Posts: 18
Joined: 05-04-2007


Message 113 of 113 (401305)
05-19-2007 6:18 AM


How do we know these polar ice caps are not melting because we forgot to replenish the ozone layer 15 years ago by launching those rockets up to the south pole with fresh ozone...or has everyone forgot. It may not be co2 induced global warming that will flood the world, but forgetfulness.

What about coconuts?

  
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