Talk:North Atlantic oscillation
|WikiProject Environment / Climate change||(Rated Start-class)|
|WikiProject Meteorology||(Rated Start-class, Low-importance)|
What is ment with NAM under definition? North american mesoscale model does not make much sense to me in this context. —Preceding unsigned comment added by 220.127.116.11 (talk) 12:49, 3 February 2010 (UTC)
More Logical Presentation?
I propose a few changes:
- Say what the NAO actually is: a complex climatic phenomenon - we could've guessed that. How about:
- Westerly winds blowing across the Atlantic into Europe, bring warm, moist air and in years when westerlies are strong, summers are cool, winters are mild and rain is frequent. If westerlies are suppressed, the temperature is more extreme in summer and winter leading to heatwaves and deep freezes and rainfall is less. A permanent low-pressure system over Greenland and a permanent high-pressure system over the Azores control the direction and strength of westerly winds into Europe. The relative strengths and positions of these systems vary from year to year and this variation is known as the North Atlantic Oscillation (NAO). A large difference in the pressure at the two stations (a high index year, denoted NAO+) leads to increased westerlies and, consequently, cool summers and mild & wet winters in Europe. In contrast, if the index is low (NAO-), westerlies are suppressed and winters are cold.
- Correct errors: fluctuations of climate between Iceland and the Azores Surely, fluctuations in pressure or weather but not climate.
- Simplify: ...as far east as northern sections of central Asia Where is that? How about just North Atlantic and surrounding continents?
- Remove fluff: A great deal however is not known,... - true of any subject. This last sentence adds nothing and is strangely out of place.
--Oscar Bravo 07:14, 3 August 2006 (UTC)
- Sounds fair enough William M. Connolley 07:31, 3 August 2006 (UTC)
Should'nt this graphik be used (http://www.cru.uea.ac.uk/~timo/projpages/nao_ts.gif) as it has a longer time range? —Preceding unsigned comment added by 18.104.22.168 (talk) 17:23, 19 December 2008 (UTC)
Greenland - Denmark
Having lived in both countries, I am wondering if this is the explanation for why the weather is always (or nearly so) opposite in those countries (and presumably in the rest of Scandinavia)? Whenever Greenland has a mild winter, Denmark has a hard one, and the opposite applies, and also for the summer season. -- Fyslee/talk 07:17, 21 May 2007 (UTC)
The Answer is both yes and no, if you are talking about a span over a couple of months then probably no and it has to do with the position of the jet stream but if it is over a period of a couple of weeks then probably yes because the NAO fluctuates over a period of a weeks not months. -WxHalo (talk) 18:16, 9 December 2007 (UTC)
East-west or pressure variations
The intro says that it is the east west movement of the low and high that define the NAO. Later in the article it says it's the pressure difference between two stations. Is the pressure difference mainly due to the east west movement and is there no significant variation in the strengths of the low and high ? Rod57 (talk) 20:04, 10 January 2010 (UTC)
- No, the intro says Through east-west oscillation motions of the Icelandic low and the Azores high, it controls the strength and direction of westerly winds and storm tracks across the North Atlantic. It doesn't say it *is* the EW movement.
- That the ocean may play an active role in determining the evolution of the NAO is also one pathway by which some limited predictability might exist rather suggests that oceanic control is far from all William M. Connolley (talk) 20:37, 10 January 2010 (UTC)