Comments on: Updated Polar Urals Data

By: A Belated SI for D’Arrigo et al 2006 « Climate Audit

A Belated SI for D’Arrigo et al 2006 « Climate Audit — Sat, 20 Oct 2012 19:31:13 +0000

[...] data set is what I’ve called the “Polar Urals Update”. On Sep 26, 2005 at CA here, I did a standard RCS calculation on the combined larch data from russ021 and russ176, observing [...]

By: Yamal and IPCC AR4 Review Comments « Climate Audit

Yamal and IPCC AR4 Review Comments « Climate Audit — Thu, 15 Apr 2010 18:35:54 +0000

[...] information for the medieval period for the Polar Urals site used in MBH and Jones et al 1998 (see here (Aug 2005) for my first mention of the Polar Urals update). In Feb 2006, D’Arrigo (Wilson) et [...]

By: Chas

Chas — Thu, 29 Sep 2005 19:38:58 +0000

Re: July temperature and annual mean
Out of curiosity I had a look at this within the CET series:
July is part of the annual mean, so to avoid having a part-whole correlation , I compared July to the average of the other 11 months: July temperature variation explains only 10% of the variation of the rest of the year average. Not a lot, and this might be spurious.

PS Armagh Observatory has strung together its various thermometer records (1796 to 2002):
http://climate.arm.ac.uk:80/445.pdf

By: Steve McIntyre

Steve McIntyre — Thu, 29 Sep 2005 04:06:09 +0000

You are perhaps thinking of Gaspe cedars and bristlecones.

By: TCO

TCO — Wed, 28 Sep 2005 22:57:21 +0000

well if you can have a proxy that magically responds to the global but not local trends, maybe you can do the same with year versus summer.

By: Murray Duffin

Murray Duffin — Wed, 28 Sep 2005 19:25:47 +0000

I noted in a post some days back that northern tree rings correlate with summer conditions, and northern temperature change has been a winter phenomenon. The heat wave in Europe in 2003 produced reduced plant growth, ie narrow tree ring corresponding with hot, not cold. The summer of 2004 in North America was the mildest (coolest) in about 100 years, but 2004 on average was a top decile warm year. Contrary to 3) above, it seems that all of the critical arguments support the conclusion that tree rings are not a proxy for temperature on any scale. Murray

By: Larry Huldén

Larry Huldén — Wed, 28 Sep 2005 16:56:36 +0000

We can not assume that summer mean temperature correlate with annual mean temperature. At least in Scandinavia summer mean temperature has not increased during the last 280 years but the winter mean temperature increased by at least 1-2 centigrade (I don’t have the figures at hand just now).

By: beng

beng — Wed, 28 Sep 2005 14:45:25 +0000

Steve, you prb’ly know this, but 1816 was the “year without a summer” in eastern NA & Europe. Hvy volcanic dust from the eruption of Tambora in 1815.

http://www.islandnet.com/~see/weather/history/1816.htm

http://en.wikipedia.org/wiki/Year_Without_A_Summer

By: Mats Holmstrom

Mats Holmstrom — Wed, 28 Sep 2005 03:20:42 +0000

(Oops, I posted this under the wrong thread the first time. Anyway, here it comes again:)

It is interesting to note that the pine trees studied in the McCarroll paper is probably very similar to Briffa’s Tornetrask pines. These regions of northern Sweden and Finland are quite similar.

The connection between tree growth and sunshine is interesting, especially since it seems that the solar radiation at Earth’s surface varies quite a lot (R.T. Pinker et al., Science, 308, p850, 2005). In that paper they state that At high latitudes, plant growth is light-limited, and a decrease in solar radiation can affect net primary productivity. Consistent with high latitude tree growth being a proxy for sunshine.

By: TCO

TCO — Tue, 27 Sep 2005 22:08:48 +0000

We (you ) should invite the authors over here to the discussion…