mawingho From Hong Kong, joined Jul 2012, 40 posts, RR: 0 Posted (1 year 3 months 1 week 1 day 13 hours ago) and read 2812 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.
tdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 81 Reply 1, posted (1 year 3 months 1 week 1 day 8 hours ago) and read 2741 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.
tdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 81 Reply 5, posted (1 year 3 months 1 week 5 hours ago) and read 2527 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.