Citat:
Intressant! I så fall är Wikipediaartikeln jag litade(?) till inte direkt neutral.
Ursprungligen postat av Quantilho
Tvärt om så var MWP ett globalt fenomen och de är de flesta överens om. Däremot vill ju inte IPCC och en av deras frontfigurer i form av Mann se det på det sättet utan stödjer sig på Manns studie där han menar att det bara var ett regionalt fenomen.
Att MWP var ett globalt fenomen kan man hitta många artiklar som stödjer. Exempelvis dessa:
Uppmätning av MWP i Afrika och Sydafrika
"Changing Gradients of Climate Change in Southern Africa during the Past Millennium: Implications for Population Movements" av Tyson et al, Climatic Change, Volume 52, Numbers 1-2 / January, 2002
http://www.springerlink.com/content/v44412817560471n/
"Glacial geological evidence for the medieval warm period", av Grove & Switzur, Climatic Change, Volume 26, Numbers 2-3 / March, 1994
http://www.springerlink.com/content/g15qv13t1v12np00/
MWP i USA
"Medieval Warm Period, Little Ice Age and 20th century temperature variability from Chesapeake Bay", av Cronin et al, Global and Planetary Change, Volume 36, Issues 1-2, March 2003, Pages 17-29
http://dx.doi.org/10.1016/S0921-8181(02)00161-3
MWP uppmäts i södra Chile
"Tree-ring and glacial evidence for the medieval warm epoch and the little ice age in southern South America" av Villaba, Climatic Change, Volume 26, Numbers 2-3 / March, 1994
http://www.springerlink.com/content/x0214563n1n44731/
Så det är inte direkt någon brist på material som talar om en varmperiod under medeltiden över alla platser på jorden.
Att MWP var ett globalt fenomen kan man hitta många artiklar som stödjer. Exempelvis dessa:
Uppmätning av MWP i Afrika och Sydafrika
"Changing Gradients of Climate Change in Southern Africa during the Past Millennium: Implications for Population Movements" av Tyson et al, Climatic Change, Volume 52, Numbers 1-2 / January, 2002
http://www.springerlink.com/content/v44412817560471n/
"Glacial geological evidence for the medieval warm period", av Grove & Switzur, Climatic Change, Volume 26, Numbers 2-3 / March, 1994
http://www.springerlink.com/content/g15qv13t1v12np00/
MWP i USA
"Medieval Warm Period, Little Ice Age and 20th century temperature variability from Chesapeake Bay", av Cronin et al, Global and Planetary Change, Volume 36, Issues 1-2, March 2003, Pages 17-29
http://dx.doi.org/10.1016/S0921-8181(02)00161-3
MWP uppmäts i södra Chile
"Tree-ring and glacial evidence for the medieval warm epoch and the little ice age in southern South America" av Villaba, Climatic Change, Volume 26, Numbers 2-3 / March, 1994
http://www.springerlink.com/content/x0214563n1n44731/
Så det är inte direkt någon brist på material som talar om en varmperiod under medeltiden över alla platser på jorden.
Citat:
The Medieval Warm Period (MWP) or Medieval Climate Optimum was a time of unusually warm climate in the North Atlantic region, lasting from about the tenth century to about the fourteenth century.
[...]
It was initially believed that the temperature changes were global [2]. However, this view has been questioned; the 2001 IPCC report summarises this research, saying "…current evidence does not support globally synchronous periods of anomalous cold or warmth over this time frame, and the conventional terms of 'Little Ice Age' and 'Medieval Warm Period' appear to have limited utility in describing trends in hemispheric or global mean temperature changes in past centuries".
[...]
An ice core from the eastern Bransfield Basin, Antarctic Peninsula, clearly identifies events of the Little Ice Age and Medieval Warm Period.[16] The core clearly shows a distinctly cold period about AD 1000–1100, neatly illustrating the fact that "MWP" is a moveable term, and that during the "warm" period there were, regionally, periods of both warmth and cold.
[...]
It was initially believed that the temperature changes were global [2]. However, this view has been questioned; the 2001 IPCC report summarises this research, saying "…current evidence does not support globally synchronous periods of anomalous cold or warmth over this time frame, and the conventional terms of 'Little Ice Age' and 'Medieval Warm Period' appear to have limited utility in describing trends in hemispheric or global mean temperature changes in past centuries".
[...]
An ice core from the eastern Bransfield Basin, Antarctic Peninsula, clearly identifies events of the Little Ice Age and Medieval Warm Period.[16] The core clearly shows a distinctly cold period about AD 1000–1100, neatly illustrating the fact that "MWP" is a moveable term, and that during the "warm" period there were, regionally, periods of both warmth and cold.