Satellites Show That Earth Has a Fever 596
Roland Piquepaille writes "A recent study from NASA says that satellites are acting as thermometers in space. Contrary to meteorological ground stations which measure the air temperature around two meters above the ground, satellites can accurately measure the temperature of the Earth's skin. And this new study, which covers the 18-year period going from 1981 to 1998, shows that the Earth's temperature is rising 0.43C per decade instead of the O.34C found by previous methods. Unfortunately for us, if satellites can more precisely measure this rise of the Earth's temperature, they cannot cure this fever. This overview contains more details and a spectacular image showing the European heat wave of the summer of 2003."
Re:So? (Score:4, Informative)
Global warming not only increases, but accelerates in a self-feeding reaction that extinguishes all life* on the planet Earth.
Don't you love worst case scenerios?
* - Well, any life worth talking about, anyhow. Do we really have to count those microscopic volcanic organisms?
Re:So? (Score:2, Informative)
Well, actually, (Score:5, Informative)
A case in point is the atlantic conveyer (the 'Gulf Stream' to us Brits). If the conveyer stops, an absolutely massive amount of energy will cease to be delivered to where it currently is. The knock-on effects aren't really model-able, we just don't have the knowledge, but since staggeringly enormous amounts of warmth would cease to be delivered to the UK coastline, you could assume it will get colder, even if you don't know quite how much. To give some perspective, it generates a difference of approximately 20 degrees celcius between points at the same latitude. 20 degrees of delta-T over several hundred billion tons of water is a lot of energy to be dependent on far-easier-to-change salinity level.
The atlantic conveyer depends on salinity in different parts of the world. If it rains more (in places that it currently rains little) and rains less (in places where it currently rains significantly) the saline levels will change, and the conveyer will be affected - at the critical point, it will simply stop. There's no obvious way we could restart it either. Shifting several hundred billion tons of water is way beyond our capabilities, and restoring the initial conditions may not be sufficient.
I guess I'm sufficiently worried about the consequences (which we will not be able to counter) to pay some heed to people who try to assess risk under next-to-impossible scientific conditions. I guess, given the potential consequences, that I'm willing to listen more to those who get off their backsides and put some effort into the analysis than people who sit around saying, 'hell we've had ice ages before and we will again'.
Actually humankind hasn't had ice-ages before, and to suggest we'd just cope is hubris of the highest order. We live in a highly technological society, and yes, given an immense struggle I think we would probably cope, as in 'Western civilisation' would cope. Countless millions would die in poorer, less developed, and simply unluckily-positioned countries as weather systems went out of control. One other thought is that a highly-structured, lean-and-mean (due to commercial pressures, mainly) society is a vulnerable society. If central America were reduced to a desert (unlikely, but possible) then the food chain would break within the US, and other countries would have a hard-enough time to feed their own. 280 million people is a lot of mouths...
Simon
Re:So? (Score:3, Informative)
Anyway, yes, there is natural variability. But humans have dumped enough GHGs into the atmosphere that our contribution is an order of magnitude larger than the sun's variation over the last 250 years. http://www.ipcc.ch/pub/spm22-01.pdf page 8, for a reference.
Finally, some people have proposed putting sunshades in orbit or the equivalent, but it seems like it first we can try to reduce our contribution by controlling some of our emissions.
Re:The map of Europe was interesting but... (Score:2, Informative)
This is something the Republicans need to start doing. They have far more opportunity for education and far more chances to understand the big picture, but it was the Republicans that threw out the antecdotal data that Al Gore didn't know what the fuck he was talking about simply because he gave the speech on the coldest day in the near recorded history.
One of the things people fail to understand is that Global Warming doesn't mean *EVERYTHING* is getting warmer, but that there are enough of a *GLOBAL* change that it effects local temps.
What does that mean for all of us? It means wilder temperature fluxuations for the most part. In most of the US, we can actually expect colder winters because of global warming, but also unpredictable weather change. I can remember riding my motorcycle on an 80 degree day a few years ago in the middle of December in the middle of Indianapolis up to Chicago (the trip back, however, wasn't as pleasant). I can also remember a few years back when we were getting snow storms almost up to May.
This is what Global Warming is going to do. you may never feel the weather being warmer, but it will be warmer and less predictable.
Oh year, and its also said that according to US military data that was prepared specifically in regards to how the military needs to plan and strategize for future situations that Global Warming if all goes the way their scientists say it will, most of the US's west coast will loose what little natural rain fall it gets in the next 30 to 50 years. The artic starts a meltdown just barely and it ruins the weather patterns over that side. By the same token, Russia is said to actually get MUCH colder -- which the military supposes means that the Russians will then be far more interested in the Middle East than they are today, maybe leading us into another 'cold war' -- and maybe making Russia one of the powerhouses of Europe once again as they continue to hold some of the largest untapped oil reserves out there.
Antecdotes mean very little. Idiots with their soundbytable (???) sentences deserve to be treated as the idiots they are. I have far more respect for folks like Al Gore than anyone here on this site...
Re:So? (Score:2, Informative)
Your premise is false, so your argument is invalid.
Then you go and cite a bunch of sources that say that the Earth's temperature fluctuates over time. Duh. We already know that, and it doesn't support your premise at all. You need to cite evidence that human activity doesn't cause the Earth's temperature to change.
It is true the Earth's temperature fluctuates over time. It is also theorized, and back by strong evidence, that human activity can affect the global climate.
Finally, you confuse theory with fact. Let's not "just drop it" (funny the way you say it, as though you are member of the community of people who are actually studying this issue). It is a theory, with supporting evidence. You can go ahead and drop it, but I suggest people who actually understand the issue and study it continue to work on it. That's what people do with supported theories. They work on proving or disproving them.
You should probably take a few basic logic and science classes before posting any more comments to threads dealing with scientific theories. And, given your +4 rating, the moderators should take some of those classes as well.
I know you're joking, but... (Score:3, Informative)
I know you're joking, but parking lots and roads are responsible for altering weather patterns and causing local climate changes. Birds have even adapted to following highways because of the thermals they generate...
The technology behind these satellites... (Score:5, Informative)
MSU - 1970s era air temperature
All of the above are what are known as microwave sounders or radiometers. They look at radiation in specific bands in the microwave region of the spectrum (based on oxygen absorption lines) to infer air temperatures.
It looks like the study in the article was using MODIS [nasa.gov] and TOVS [noaa.gov] data. TOVS consists of some of the above instruments - MSU and AMSU in particular for this application. MODIS is another sensor that doesn't look at the microwave region of the spectrum, so it's out of my area of expertise. Look at the website for more info on that if you're interested. :)
Re:Well, actually, (Score:4, Informative)
From a google search [216.239.59.104]
If that's 'peachy', I'd sure-as-hell not want to come across anything 'hard'. Granted it's just one view, but then any one person (you and I included) only have one view as well...
Re:What's the greatest cause of global warming?... (Score:3, Informative)
The Sun may be big, but without the magnifying glass it isn't likely to fry the ant...
More satallite data (Score:3, Informative)
So, which one to believe is the "true" measure of our global climate?
Re:So? (Score:4, Informative)
Really? Do you know the difference in global temperature between the last ice age, and now?
Approximately 3 degrees celsius.
How long ago was that?
10,000 years.
If the temperature is now changing
not so helpful to kick around numbers (Score:2, Informative)
In the oceans alone, that is about 24 thousand peta-joules of
energy.
What does that mean? It's just a number. I don't know the significance of it, but I couldn't dismiss it offhand.
Re:Energy content of the wind (Score:1, Informative)
The satellite data shows a 0.43 increase while the air temp measures show 0.34. That means the orginal poster was wrong in stating that there was more enegy in the air.
Re:So? (Score:0, Informative)
It's been shown with data available that the temperature has been going up (on average) since people have been able to measure it accurately. The world is in a natural warming state. We could stop using fossil fuels at all and it's not going to keep the planet from warming.