[blam]

Ping.

[T. P. Pole]

To reconstruct climate, scientists use natural archives, including tree rings, ice cores and laminated sediments. These natural records of temperature, precipitation and other environmental history have been carefully calibrated with instrumental observations, giving scientists quantitative information on past conditions at particular locations.

How about the archives that include the facts that people lived and grew crops in Iceland? Or is that too subjective?

[smith288]

[Always Right]

Medieval Warmth
in Alaska (3 Oct 03)

A new paper in Science (v.30, 26 Sept 03, p.1890) by Feng Sheng Hu et al, reveals that western Alaska enjoyed the full warmth of the Medieval Warm Period (850 AD to 1200 AD), based on cores from tundra lake sediments. There was also a previous warm period from 0 AD to 300 AD, the periods of warmth apparently following a cyclic pattern, consistent with changes in the Sun.

Ordinarily, climate events 1,000 years ago would not excite public interest, were it not for the IPCC's obsession with a spurious claim, based on the flimsiest of evidence, that no time in the past was as warm as it is today.

This is the infamous `Hockey Stick' theory, the latest incarnation of which was recently published in Geophysical Research Letters.

The key claim of the `Hockey Stick' theory was that the major known climatic events of the past millennium - the Medieval Warm Period and Little Ice Age - were merely local events in Europe and that the bulk of the northern hemisphere - and even the world as a whole - enjoyed an even and stable climate until the human warming of the 20th century. That's the theory - and none of it is true.
(contd...)

Now we have recent evidence that it spread far beyond Europe, all the way into the northern Pacific via western Alaska, thus rendering the `Hockey Stick' as a junk theory which is now only propped up by political correctness and public vilification of its critics.

Numerous papers and studies are now being published which demonstrate what a nonsense the IPCC's `Hockey Stick' really is, and its almost fanatical adoption by the greenhouse industry reflects badly on their scientific competence.

Source: John Daly

[Always Right]

Scientists have well-calibrated, detailed data from such proxy records covering the past 1,500 years of temperature for only a few locations around the globe, the researchers noted.

Well-calibrated??? How do you calibrate tree ring data which tells you more about the length of the growing season than the tempreture?

However, recent modeling studies show that increased solar irradiance does not warm Earth's surface at all locations, the research team wrote.

The is just great scientific work. Use your computer models to prove your theory. Of course your models assume your theory is correct. Computers just tell you what you told them to tell you, which isn't proof of anything.

[NotQuiteCricket]

(six-tenths of a degree Fahrenheit)
Is there a reason for this to not be three-fifths? What happened to always reducing fractions?

[DustyMoment]

The problem with all of this is that prior to accurate temperature records being kept (starting in the late 19th Century) we don't really know what the climate was like other than in the most general terms. Theories abound.

Global warming is condemned as a bad thing that threatens all life on the planet and, yet, the Renaissance is attributed to a period of global warming that allowed people to get out of dark, damp houses filled with exhaust gases from fires and lamps and get into the sunshine. The Renaissance sparked one of the greatest periods (to date) of growth, exploration and artistic expression. So, is global warming necessarily an evil thing?

The fact is that we simply have too little knowledge of earth's climate and the influences on it. Until we have a much larger data sample size (at least another century and possibly more) of climatological data, we are unable to accurately explain climatological anomalies with anything other than speculation and hysterical hyperbole.

[avg_freeper]

I imagine that being a climate researcher is very difficult when you're required to spend so much time running around the lab with fingers in your ears yelling "La La La I CAN'T HEAR YOU".

[farmfriend]

Rights, farms, environment ping.

Let me know if you wish to be added or removed from this list.
I don't get offended if you want to be removed.

[editor-surveyor]

Certified Clap-Trap.

[polemikos]

I think there's a a significant correlation between climatology programs and global warming. Increased instrumentation of weather attributes is causing an increase in measured temperatures worldwide. /sarcasm

[AFPhys]

I don't think I'll even bother to look further into this "study". There have been at least five others which contend that the Medieval Warming WAS global and persistent, several of which have used data analogous so that which is apparently in this "study". Sorry, guys --- I don't buy it.
I suppose they find that the "Little Ice Age" was also an event which has only local ramifications.

[gatex]

Temperature data from Vostok ice cores---BP = before present

Temperature appears to cycle every 100,000 years.

link to graph = http://cdiac.esd.ornl.gov/trends/temp/vostok/jouz_tem.htm

[PoorMuttly]

These theories' flawed flaws are flawed.

Ain't science great ?!!

[aruanan]

Note above they said that "some areas warmed while others cooled"? Duh. People have known that for a long time. The Medieval Climate Optimum didn't occur over the entire earth at exactly the same time. I read about this years ago.

Did you see this over at www.sepp.org today? It's always fun to see something like this:

***********************************************************
***********************************************************

2. Hockeystick demolished

Corrections to the Mann et. al. (1998) Proxy Data Base and Northern Hemispheric Average Temperature Series.
McIntyre, Steven and Ross McKitrick,. Energy & Environment Vol. 14, No 6, pp. 751-771, October 26, 2003

Freely downloadable from < <http://www.multi-science.co.uk/mcintyre_02.pdf>
See also www.climate2003.com/index.html and www.climate2003.com/audit.html

ABSTRACT

The data set of proxies of past climate used in Mann, Bradley and Hughes (1998, "MBH98" hereafter) for the estimation of temperatures from 1400 to 1980 contains collation errors, unjustifiable truncation or extrapolation of source data, obsolete data, geographical location errors, incorrect calculation of principal components and other quality control defects. We detail these errors and defects. We then apply MBH98 methodology to the construction of a Northern Hemisphere average temperature index for the 1400-1980 period, using corrected and updated source data.

The major finding is that the values in the early 15th century exceed any values in the 20th century. The particular "hockey stick" shape derived in the MBH98 proxy construction - a temperature index that decreases slightly between the early 15th century and early 20th century and then increases dramatically up to 1980 - is primarily an artifact of poor data handling, obsolete data and incorrect calculation of principal components.

--------------------------------------
Comment by David Wojick: We all suspected that the Mann et al hockey stick was hiding the Medieval Warm Period and Little Ice Age. Now these two Canadians have proven it. It may have been warmer just 500 years ago. A fine piece of work.

Comment by Fred Singer on the initial response by Mann, Bradley, Hughes to McIntyre, McKitrick:

First, it is entirely appropriate for MBH to express their views about MM. They do so without invective or rancor, and without ad hominem attacks on MM, the journal and its editor , etc. In that sense, it is in the best scientific tradition.

Having said this, I notice that MBH do not reply to the specific criticisms discussed by MM regarding the data quality in the MBH data-set (as listed in MM's Audit Issues) but instead develop criticisms of their own against the reconstruction of MM.

The response of MBH also seems to indicate that their conclusions are highly sensitive to subtle points in "principal-component" analysis of tree rings. In itself, elucidation of this sensitivity will be an interesting result of this discussion.

I think we should hear what MM have to say before we jump to any conclusions. Even if MBH are successful in their critique of the MM reconstruction, but do not at the same time respond to the data-integrity issues, we may be left with the situation where both parties are wrong.

Accordingly, the first concern should be to resolve the data problems: let's get an agreed data-set representing the most up-to-date versions of the proxies used by MBH: no truncations, no obsolete data, etc.

It would also be helpful in resolving this controversy if there was full disclosure by MBH of their procedures in far more detail than done in MBH98. Until that is done, it is very difficult to express further opinions on any of the technical aspects of the analyses by MM and MBH.

After taking these steps, if the parties can resolve their differences in some way -- fine. If, as I suspect, they cannot, then one needs an independent body of experts in the analysis of time series, possibly economists and statisticians, who are uninvolved with climate issues.

I will therefore express no further opinion on any of the technical aspects of the analyses by MM and MBH.
***********************************************************

[SunkenCiv]

Blast from the Past (2003).

Just adding this to the GGG catalog, not sending a general distribution.

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[SunkenCiv]

Note: this topic is from 2003.

The Little Ice Age: How Climate Made History 1300-1850 by Brian M. Fagan Paperback

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[SunkenCiv]

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