Date: Wed Jan 18, 2006 5:41 pm. By: Coby Beck
"LongmuirG" wrote in message
Coby Beck disappointed his audience again: We would have to correct each reading for calibration, ...
Again, irrelevant ...
Calibration is irrelevant? Oh dear!
Wow. Your second response to me and you have already reduced yourself to the oldest entry in the Usenet Handbook of Dirty Tricks. The actual exchange was this:
LongmuirG: We would have to correct each reading for calibration, and then adjust them all to a common datum. (Temperature varies with elevation, of course, and it is about 9,200 meters from the lowest point to the highest point on the Earth's surface). Coby: Again, irrelevant except where you can show a particular station has changed its altitude due to subsidence or geostatic rebound or whatever else might effect it.
You cut my 25 word response at word 2 and you removed the point it was a response to. Surprise, surprise, another "concerned climate sceptic" who has nothing to argue with and instead lies and misrepresents.
Oh yes, and ignores about 99% of what I wrote, including direct and simple questions. This is what remains unanswered by you:
REPOST=============
In my neighborhood, difference between daily low & high is often over 20 Celsius degrees. Difference between winter low & summer high is over 50 Celsius degrees -- and we are looking for year-on-year average global temperature differences measured in hundredths of a degree? Quite a challenge!
I don't believe that it is such a technological challenge to measure 1/100th of a degree celsius. But anyway, I think the high precision numbers you do sometimes see are results of the mathematics and as they come with ranges and error bars you are really just creating a strawman here. You are also getting confused by number of decimal places versus significant digits. If we have a measured change of .8oC over 100years this is .008oC per year, both figures are one significant digit. That does not mean anyone is claiming they measured 14.003oC one day and 14.011 the next.
To come up with a definitive annual average global temperature, we would first have to decide what we wanted to measure -- temperature at ground level? Or 1 meter above ground? Or 3 meters above ground?
You must also ensure that wind and rain and direct sunlight do not bias your readings. Yes, these things have been thought about and standards set. It is not however required that every station adhere to the same height standard as every other, only that they each be consistent. No one cares if the global average temperature at 2 metres is 14.50 or 14.51 the information of interest is the change over time. Consistency is the only requirement.
Then we would have to take many measurements and average them over time & location. Say we took a fairly coarse discretization -- one temperature reading per hour per square kilometer. Over a year, that would be roughly 8,800 readings at each of 510 million locations; 4.5 trillion temperature readings.
This is just ridiculous overkill. You know nothing about sampling data. Nor are hourly readings required for this analysis, just the daily high and low.
We would have to correct each reading for calibration, and then adjust them all to a common datum. (Temperature varies with elevation, of course, and it is about 9,200 meters from the lowest point to the highest point on the Earth's surface).
Again, irrelevant except where you can show a particular station has changed its altitude due to subsidence or geostatic rebound or whatever else might effect it.
Next we would need to develop an objective unbiased methodology to modify those adjusted readings for local effects -- some of those square kilometers are going to include things like volcanoes & steel mills. Then do the arithmetic and we have got our annual average global temperature for one year.
Why do you find this so daunting? But rejecting the ridiculous premise of one station every kilometer we can avoid volcanoes and most steel mills.
Of course, we don't actually measure 4.5 trillion real temperature readings per year, so all we can get is an approximation to the true annual average global temperature, incorporating many assumptions. How good an approximation? Great question! It would be nice to know, especially when we are trying to measure such tiny changes.
Why don't you read all about it here: http://data.giss.nasa.gov/gistemp/2005/
Follow the links, read the papers, ask the authors for clarifications. Or do you prefer FUD over facts?
Now, how do we come up with the global temperature for the year 1900? In 1900, horsepower meant exactly that. Sailing ships were still in use. No human being had even reached the South Pole, let alone measured its temperature. How do we confirm the calibration of old temperature records from 1900? Obviously, there are lots & lots & lots of assumptions in the global temperature for 1900.
You are again arguing from ignorance and assuming that the people who study these issues know less than you. Why would anyone believe that? Why would you believe that? There are indeed issues similar to what you describe. But they are problems that get solved not issues everyone obediently ignores so as not to anger their Greenpease masters.
If you are dealing with all manner of random errors it will not effect your trends, the real challenges are in identifying sources of bias (such as urban heat islands) and coming up with methods for correction. But these are not show stoppers, they are things that very smart people study and deal with.
It is fairly obvious that the uncertainty band for "annual average global temperature" gets wider as we go further back in time and have to rely on increasingly sparse, decreasingly reliable records. And if we take account of that increasing uncertainty, the alleged "global warming" trend may well disappear into the error bars.
Did you look at these? http://www.grida.no/climate/ipcc_tar/wg1/fig2-1.htm
The error range is way too small. Besides, that wishful thinking cuts both ways, why are you not warning us that the trend may actually be much larger?
Did you look at the borehole records? Less resolution but longer term and all modern-day direct measurements: http://www.ncdc.noaa.gov/paleo/globalwarming/pollack.html
Satellites, radio sondes, surface readings, borehole readings, ocean temperature measurements, world-wide glacial response, it all agrees. Aren't you tired yet? You must be because you ignored most of my post.
END REPOST========================
Imagine my disappointment when you removed all that from your reply and did not address *any single point* I raised. Of particular interest are: - Why do you think you are more competent than the scientists at GISS? - Why does the altitude of a particular station matter if it is unchanged? - Why do you think we need trillions of measurements, this shows great ignorance of how to sample data? - Why do you think the legitimate difficulties posed by changing insturments, moving staions, urban heat island effects, varied concentrations of stations etc are insurmountable? - Why are you not concerned that errors have potentially resulted in an underestimation of temperature change? - Do you prefer FUD over facts? - Did you look at the borehole records?
The point that you establish beyond doubt is that you have no idea how "annual average global temperature" is determined -- yet you are sincerely concerned that it is increasing. Sounds like what the psychologists call "confirmation bias".
It is unfortunate that so-called environmentalists have made the issue of global climate so political, using it as a vehicle to advance their ulterior motives.
I agree, the issue is politicized. This is why I do not recommend getting your scientific information from political organizations like TechCentralStation, JunkScience or Greenpeace. Instead try established scientific institutions that specialize in climate, ocean and atmosphere fields. Institutions like these:
http://www.giss.nasa.gov/edu/gwdebate/ http://www.ncdc.noaa.gov/oa/climate/globalwarming.html http://www.grida.no/climate/ipcc_tar/wg1/index.htm http://books.nap.edu/collections/global_warming/index.html http://www.socc.ca/permafrost/permafrost_future_e.cfm http://yosemite.epa.gov/OAR/globalwarming.nsf/content/index.html http://www.royalsoc.ac.uk/page.asp?id=3135 http://www.agu.org/sci_soc/policy/climate_change_position.html
Denying the rising temperature is truly a desparate mental contortion, not even Pat Michaels, Fred Singer or Steve Milloy, the best scientists and journalist Exxon's money can buy, not even these fine fellows deny the temperature is rising. You have fallen off the denialist's bandwagon, you missed the call for retreat. The new trench has been dug at "it's a magic natural rise that has nothing to do with humans"
It would be useful for human beings to have a much better understanding of the extremely complex physics of this planet than we have today, starting with honest analysis of the basic data.
There is nothing honest in your presentations here.
But we won't get there, dear Coby, unless sincere people like you start to use your faculties for independent thinking.
Given your resorting to nothing but dirty tricks, you don't give me much reason to be concerned about my own faculties for independent thinking, thanks.
-- Coby Beck (remove #\Space "coby 101 @ bigpond . com")