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Rétroaction de la vapeur d’eau

28 Nov 2004 by rasmus

Translations: (English)

La vapeur d’eau est un gaz a effet de serre puissant, qui absorbe les rayonnements de longueurs d’ondes élevées. Si la concentration atmosphérique en vapeur d’eau augmente a cause du réchauffement climatique, celle-ci va augmenter en retour l’effet de serre encore plus. Il est bien connu que le taux d’évaporation est lié a la température, et qu’une hausse des températures accroît la pression de la vapeur (équation de Clausius-Clapeyron). Ce processus est connu comme étant la rétroaction (positive) de la vapeur d’eau. Une différence importante entre la vapeur d’eau et les autres gaz a effet de serre comme le CO2 est que la vapeur d’eau ne passe qu’un temps très court dans l’atmosphère avant d’être précipité, alors que la temps de résidence du CO2 dans l’atmosphère peut dépasser une centaine d’années.

Filed Under: Glossary

Rutherford et al 2005 highlights

22 Nov 2004 by mike

The claims of McIntyre and McKitrick regarding the Mann et al (1998) temperature reconstruction have recently been discredited by the following peer-reviewed article to appear in the American Meteorological Society journal, “Journal of Climate“:

Rutherford, S., Mann, M.E., Osborn, T.J., Bradley, R.S., Briffa, K.R., Hughes, M.K., Jones, P.D., Proxy-based Northern Hemisphere Surface Temperature Reconstructions: Sensitivity to Methodology, Predictor Network, Target Season and Target Domain, Journal of Climate, in press (2005).

Key excerpts from the article are provided below: [Read more…] about Rutherford et al 2005 highlights

Filed Under: Supplemental data

PCA details

22 Nov 2004 by mike

PCA of the 70 North American ITRDB Tree-ring Proxy Series used by Mann et al (1998)

[Read more…] about PCA details

Filed Under: Supplemental data

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