Comments on: Post-1980 Proxies #1: Twisted Tree Heartrot Hill

By: Survivorship Bias « Climate Audit

Survivorship Bias « Climate Audit — Sat, 12 Nov 2011 15:12:58 +0000

[...] Down Quadratic Twisted Tree Heartrot Hill Wilmking in Alaska Positive and Negative Responders bender on [...]

By: More on Positive and Negative Responders « Climate Audit

More on Positive and Negative Responders « Climate Audit — Sat, 12 Nov 2011 15:12:07 +0000

[...] in Alaska and Positive and Negative Responders. Other related posts include Upside Down Quadratic, Twisted Tree Heartrot Hill , bender on Gaspé Survivorship Bias [...]

By: Upside-Down Quadratic Proxy Response « Climate Audit

Upside-Down Quadratic Proxy Response « Climate Audit — Sat, 12 Nov 2011 15:05:01 +0000

[...] White Spruce at Northern Treeline The decline of ring widths with increasing temperatures was reported in D’Arrigo et al [2004], about which I reported briefly here: [...]

By: Steve Sadlov

Steve Sadlov — Fri, 17 Feb 2006 22:22:41 +0000

If I recall correctly, 1997 and 98 were El Nino years, with 97 being a stronger El Nino. I also seem to recall that by December of 98, we were flipping into a La Nina, based on the fact that it snowed at my house (~1000′ elevation, very close to the ocean). I certainly witnessed lots of growth in my location – 100 % due to moisture. I would also reckon that meanwhile, up in Alaska, there would have been a moisture deficit especially away from the coast, until early ’99. Are trees more of an ENSO proxy than a temperature proxy?

By: Hans Erren

Hans Erren — Fri, 13 Jan 2006 07:49:51 +0000

re 6:
like this one
http://home.casema.nl/errenwijlens/co2/pfisterbgaden.gif
http://home.casema.nl/errenwijlens/co2/errenvsluterbacher.htm

By: TCO

TCO — Sun, 11 Sep 2005 01:58:12 +0000

The key issue which we seem to keep coming back to, is how to calibrate ring width as a proxy at all. This should be based on current observations…not backed out from gridcell comparisons or the like. I mean real botanical laboratory style observations. These are important calibrative type studies. I would think that any single series that goes back in time or any temp reconstruction would refer to such calibrative studies.

By: Steve McIntyre

Steve McIntyre — Wed, 07 Sep 2005 17:01:49 +0000

Murray, I’m glad you brought this post back on the screen. I get the impression that quite a few of the “missing” tree ring proxy studies of the 1990s look like this. That’s why we hear about glacier recession and not tree rings now. The archived Jacoby sites are all south-facing.

By: Murray Duffin

Murray Duffin — Wed, 07 Sep 2005 16:23:26 +0000

It is interesting that the Maunder and Dalton minima are clearly visible, as well as the post 1930s cooling. More evidence that Maunder and Dalton were not just northern Europe phenomena. Murray

By: Ed

Ed — Wed, 16 Feb 2005 21:14:38 +0000

Does anyone have links or info that correlates tree ring patterns to temperature? I always thought the rings were wider in wetter years, and thinner in drier ones. And I’d love to see some info on how this ties into global warming.

Thanks,
Ed..

By: Steve Funk

Steve Funk — Wed, 16 Feb 2005 18:52:13 +0000

The other issue that Mann always brings up is local data vs the sum of world data.