Archives par mot-clé : Dendochronology

climate-debate

Concord and discord among Northern Hemisphere paleotemperature reconstructions from tree rings

by Scott St. George Jan Esper, December 19, 2018 in WUWT

Highlights

  • Tree rings are the backbone of most last millennium temperature reconstructions.

  • Maximum density is a superior temperature proxy than ring-width but is less available.

  • The newest tree-ring reconstructions agree better with instrumental temperatures.

  • They also fit the memory structure of instrumental temperatures more closely.

  • It is imperative to develop new, long and up-to-date maximum density chronologies.

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climate-debate

McIntyre: ‘a reductio ad absurdum of tree ring chronologies as useful temperature proxies’

by A. Watts, October 11, 2018 in WUWT

Steve McIntyre has a look at the “revised” PAGES2K temperature proxy dataset that includes tree rings and river sediments. He finds the usual ridiculous problems from the past, such as upside down data and river sediment accumulations that have more to do with building a dam than climate.

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