• Skip to primary navigation
  • Skip to main content
  • Skip to primary sidebar
  • Skip to footer

RealClimate

Climate science from climate scientists...

  • Home
  • Start here
  • Contributors
  • Archives
You are here: Home / Climate Science / Ne faisait-il pas plus chaud au Moyen-Age, pendant “l’Optimum climatique”, que maintenant?

Ne faisait-il pas plus chaud au Moyen-Age, pendant “l’Optimum climatique”, que maintenant?

8 Dec 2004 by mike

Translations: (English)
English

par Michael Mann (traduit par Thibault de Garidel)
C’est un des nombreux mythes populaires concernant les variations de température sur les siècles passés. A l’échelle globale ou hémispherique, il est admis que les températures de surface ont suivi une évolution en forme de “crosse de hockey” – (“hockey stick”), caractérisée par une longue tendance au refroidissement depuis “l’Optimum Climatique Médiéval” (grosso modo, du Xie au milieu du XIVie siècle) jusqu’au “Petit Age Glaciaire” (grosso modo du milieu du XVie au XIXie siècle), suivie d’un réchauffement rapide au XXie siècle qui culmine par les températures anormalement élevées de la fin du XXie siècle. Ces températures élevées de la fin du XXie siècle, aux échelles hémisphérique ou globale, apparaissent, d’après de nombreux travaux récents évalués par des pairs, supérieures à celles maximales de l’Optimum Médiéval.
Les assertions de températures moyennes globales plus élevées au Moyen Age que maintenant sont fondées sur un certain nombre de prémisses fausses qui (a) confondent les indicateurs de sécheresse/précipitation avec ceux de température, (b) ne font pas la différence entre des variations globales et régionales de température, et (c) utilisent tout le 20ie siecle pour définir les conditions ‘modernes’, ce qui empêche de différencier les conditions relativement fraiches du début du 20ie et celles anormalement chaudes de la fin du 20ie.

Filed Under: Climate Science, FAQ, Paleoclimate

Reader Interactions

Trackbacks

  1. super-structure » 25 Reasons Why You Should Understand Neil Boortz Is Wrong | Jason Coleman says:
    19 Sep 2007 at 10:38 AM

    […] Medieval Warm Period. Yet another popular myth. The short answer: it’s global warming, not just European warming. […]

  2. Jeff McIntire-Strasburg » Blog Archive » Green Myth-Busting: Greenland was Once Green says:
    15 Oct 2007 at 2:28 PM

    […] from NOAA. RealClimate, the blog for anyone interested in hardcore climate science, also presents a number of reasons why the perception skeptics have about the Medieval Warm Period are likely […]

  3. Understanding Global Warming « Understanding Global Warming says:
    30 Dec 2007 at 3:47 AM

    […] and had relatively little impact on the global averages. Dr. Michael Mann addresses this here (and for an example of a contrarian tactic that can make it appear otherwise, or that the current […]

  4. Understanding Global Warming says:
    6 Jan 2008 at 9:08 PM

    […] and had relatively little impact on the global averages. Dr. Michael Mann addresses this here (and for an example of a contrarian tactic that can make it appear otherwise, or that the current […]

  5. Hypography Science Forums - Co2 Acquittal says:
    1 Feb 2008 at 1:35 AM

    […] by mitigating our impact. And I know you like this place so yes, I did look here ==> RealClimate Here is an interesting article. […]

  6. Earth: The Climate Wars - Wildlife and Environment Forums says:
    20 Sep 2008 at 12:52 AM

    […] of the little ice age and medieval warm period and many other discussions of climate change: RealClimate To summarise the ideas very simplistically I think this is what they say – the little ice age and […]

  7. Understanding the Basics of Global Holocene Climate Change « Understanding Global Warming says:
    16 Mar 2009 at 8:57 PM

    […] magnitude of medieval warmth was weaker than that of today. Dr. Michael Mann also addresses this here (and for an example of a contrarian tactic that makes it appear otherwise, or that the current […]

  8. Understanding Global Warming says:
    17 Mar 2009 at 1:46 PM

    […] magnitude of medieval warmth was weaker than that of today. Dr. Michael Mann also addresses this here (and for an example of a contrarian tactic that makes it appear otherwise, or that the current […]

  9. Ben’s Blog » Blog Archive » Head to head with a Cardinal says:
    24 May 2009 at 10:58 PM

    […] qualified in a way that I, and the good Cardinal, are not. (The medieval warm period wasn’t warmer. Warming didn’t stop in 1998.) But most appalling to me was this childish attempt to use his […]

Primary Sidebar

Email Notification

get new posts sent to you automatically (free)
Loading

Recent Posts

  • Unforced variations: Feb 2023
  • 2022 updates to the temperature records
  • Unforced variations: Jan 2023
  • The water south of Greenland has been cooling, so what causes that?
  • Unforced variations: Dec 2022
  • Serious mistakes found in recent paper by Connolly et al.

Our Books

Book covers
This list of books since 2005 (in reverse chronological order) that we have been involved in, accompanied by the publisher’s official description, and some comments of independent reviewers of the work.
All Books >>

Recent Comments

  • Keith Woollard on 2022 updates to the temperature records
  • Don Williams on 2022 updates to the temperature records
  • Adam LEa on Unforced variations: Jan 2023
  • JCM on 2022 updates to the temperature records
  • Victor on 2022 updates to the temperature records
  • Roberto on Unforced variations: Jan 2023
  • Kevin McKinney on Unforced variations: Jan 2023
  • Kevin McKinney on 2022 updates to the temperature records
  • JCM on 2022 updates to the temperature records
  • Victor on 2022 updates to the temperature records
  • Willard on 2022 updates to the temperature records
  • Steven Emmerson on Unforced variations: Jan 2023

Footer

ABOUT

  • About
  • Translations
  • Privacy Policy
  • Contact Page
  • Login

DATA

  • Data Sources
  • Climate model projections compared to observations

INDEX

  • Acronym index
  • Index

Realclimate Stats

1,290 posts

8 pages

229,479 comments

Copyright © 2023 · RealClimate is a commentary site on climate science by working climate scientists for the interested public and journalists.