Atmospheric Circulation and Seasonal Variation

[Soaring Crane]

How does the summer solstice affect the position of Hadley cells? I know that the solar equator is 23.5 degrees North, which differs from the 0 degrees (as a solar equator) for the equinox. For the equinox in the N. hemisphere, there are three Hadley cells, or cells of circulation. The range of each cell are as follows: one is 0 N - 30 N, one is 30 N -60 N, and the other is 60 N and above. What exactly are the cell ranges during the summer solstice?

Thanks.

 

[Astronuc]

Apparently -

Doldrums shift from Tropic of Cancer (23.5°N) to Tropic of Capricorn
(23.5°S) and back over the course of a year
- Hadley cells and associated winds vary between 53.5°N/S to
23.5°N/S (summer solstice) to 6.5°N/S to 23.5°N/S (winter
solstice)
- between 30° N/S and 0° only on equinox

Page 7/49 of

http://www.eas.slu.edu/People/KChauff/ocean/3Oceanote_2002.pdf

and

- Ferrel cells and associated winds shifts between 83.5°N/S to
53.5°N/S (summer solstice) to 6.5°N/S to 36.5°N/S (winter
solstice)
- between 30° N/S and 60° N/S only on equinox
- Polar cells and associated winds contracts to 90°N/S to 83.5°N/S in
summer and expands to 90°N/S to 36.5°N/S in winter
- between 90° N/S and 60° N/S only on equinox

This seems interesting - http://www.wwnorton.com/college/geo/oceansci/ch/09/welcome.asp

This might be of future interest -
http://ams.allenpress.com/perlserv/...0.1175/1520-0469(1999)056<1797:TDNHC>2.0.CO;2

 

[ravenprp]

The summer solstice, which occurs in the Northern Hemisphere in late June, has a significant impact on the position and range of Hadley cells. During this time, the solar equator is at its northernmost position, at 23.5 degrees North. This means that the sun's direct rays are hitting the Earth at this latitude, resulting in warmer temperatures and stronger atmospheric circulation.

As a result, the ranges of the Hadley cells shift during the summer solstice. The cell closest to the equator, which is typically between 0 degrees and 30 degrees North during the equinox, expands to cover a larger area. It can extend up to 40 degrees North during the summer solstice, resulting in a larger area of warm, rising air and low pressure.

The middle Hadley cell, which is usually between 30 degrees and 60 degrees North during the equinox, also expands during the summer solstice. It can extend up to 50 degrees North, bringing warmer temperatures and more intense weather patterns to these latitudes.

The third Hadley cell, which is typically above 60 degrees North during the equinox, also shifts during the summer solstice. It can extend further south, covering latitudes between 50 degrees and 60 degrees North, and bringing warmer temperatures and more active weather to these areas.

Overall, the ranges of the Hadley cells during the summer solstice are larger and shifted towards the north, reflecting the increased solar radiation and warmer temperatures in the Northern Hemisphere during this time. This shift in the Hadley cells also contributes to the seasonal variation in weather patterns and climate across the globe.