(c) [email protected] 2002 Climate teleconnections in the Euro-Atlantic region 1. Overview of Euro-Atlantic teleconnection patterns 2. An example: European rainfall in Autumn 2000 3. North Atlantic ocean effects Dr. David B. Stephenson Department of Meteorology University of Reading www.met.rdg.ac.uk/cag
28
Embed
(c) [email protected] 2002 Climate teleconnections in the Euro-Atlantic region 1.Overview of Euro-Atlantic teleconnection patterns 2.An example:
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
“The relationships between weather over the Earth are so complex that it seems useless to try to derive them from theoretical considerations; and the only hope at present is that of ascertaining the facts and of arranging them in such a way that interpretation shall be possible.”
A. Ångström (1935) Teleconnections of climatic changes in present time, Geogr. Annal., 17, 243-258
“the weather at a given place is not an isolated phenomenon but is intimately connected with the weather at adjacent places”
Chief causes of teleconnections:I. Local extension of a given featureII. Propagation of weather systemsIII. Existence of changes of great extension that affects local weather:
Autumn 2000 rainfall (Sep-Nov) percent of long-term mean
England Wales Precipitation (EWP) is the average of rainfall over the 5 UK regions south of Scotland. It is obtained by taking the weighted average of about 60 rain gauges.
• Wigley et al. 1984• Wigley and Jones 1986• Gregory et al. 1991• Jones and Conway 1996• Osborn et al. 2000• Alexander and Jones 2000
M. Junge and D.B. Stephenson (2002) "Mediated and direct effects of the North Atlantic ocean on winter temperatures in northwest Europe“, Int. Journal of Climatology (submitted).
DJF central england temperature anomalies
NAO SST tripole
? ?
How much direct role do North Atlantic SSTs have in determining NW Europe temperature variations?
5 main teleconnections for Europe in winter: PEU,NAO,EAO, SCA,EAWR,PNA
Teleconnections are of use for understanding climate events e.g. Autumn 2000
The correlation between North Atlantic SSTs and European climate is mainly an indirect effect mediated by the ocean’s response to the atmospheric flow.