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Meteorology Prevailing Wind  
User currently offlinemawingho From Hong Kong, joined Jul 2012, 41 posts, RR: 0
Posted (1 year 7 months 3 weeks 2 days 22 hours ago) and read 3050 times:

"Air flow from high-pressure area to a low-pressure area, but other effects resulting from the rotation of the earth modify its direction of flow. The result is that air flows anticlockwise around high-pressure area and clockwise around low-pressure areas in the southern hemisphere. (The direction of flow is reversed in the northern hemisphere.)"

I asked someone a question related to the above sentence, and he said the wind flow from north pole to equator while the earth is rotating.

If this is true, then the air flow should be clockwise in southern hemisphere since the air flow from H to L.

I also see this page in my book, http://www.scidacreview.org/0701/images/climate2.jpg

I don't know why the direction of prevailing wind is flow like this (many arrows on the earth with different directions in different layers)

I hope someone can help me out.

Thank you very much in advance.

5 replies: All unread, jump to last
 
User currently offlinetdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80
Reply 1, posted (1 year 7 months 3 weeks 2 days 17 hours ago) and read 2979 times:

Quoting mawingho (Thread starter):
I asked someone a question related to the above sentence, and he said the wind flow from north pole to equator while the earth is rotating.

Not really. The general pattern looks like this;


Air will always flow from high to low pressure. However, due to Coriolis forces (a result of earth's rotation), any flow to the north or south will get bent. The combined effect of the bending on all the air flowing into the low from different directions is rotation. Since the direction of the Coriolis force depends on whether you're going towards or away from the equator, the rotation directions are opposite on each side of the equator.

Tom.


User currently offlineLH707330 From United States of America, joined Jun 2012, 593 posts, RR: 0
Reply 2, posted (1 year 7 months 3 weeks 2 days 12 hours ago) and read 2932 times:

Quoting tdscanuck (Reply 1):

Are those surface winds? How does the air get back to the highs?


User currently offlineiFlyLOTs From United States of America, joined Apr 2012, 433 posts, RR: 0
Reply 3, posted (1 year 7 months 3 weeks 2 days 12 hours ago) and read 2912 times:

Quoting LH707330 (Reply 2):
Are those surface winds? How does the air get back to the highs?

If I remember my meteorology class correctly, the upper level looks somewhat opposite, it would be an upper level low where the high is and an upper level high where the low is.






"...stay hungry, stay foolish" -Steve Jobs
User currently offlinemawingho From Hong Kong, joined Jul 2012, 41 posts, RR: 0
Reply 4, posted (1 year 7 months 3 weeks 2 days ago) and read 2844 times:

So the air current near the jet stream is just a Ferrel Cell?

User currently offlinetdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80
Reply 5, posted (1 year 7 months 3 weeks 1 day 14 hours ago) and read 2765 times:

Quoting mawingho (Reply 4):

So the air current near the jet stream is just a Ferrel Cell?

The Ferrel cells are between the polar and Hadley (equatorial) cells. The jet streams runs around near the upper part of the Ferrel cells but the jet streams can move around pretty widely while the Ferrel cells don't move much.

Tom.


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