Timeline for Are there tides in the atmosphere?
Current License: CC BY-SA 3.0
6 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jan 24, 2018 at 4:05 | comment | added | Ben51 | @Floris I added a temporary answer below to show you what I mean. | |
| Jan 24, 2018 at 3:44 | comment | added | Ben51 | @Floris Yes! (Well, not a full sinusoid, of course, but rather a truncated sinusoid, with all the negative lobes chopped off). There is quite a lot of energy in the 12-hour harmonic, and that is what the tropical atmosphere responds to. Fair-weather barometric pressure records from the tropics are mostly just clean 12-hour oscillations. | |
| Jan 24, 2018 at 0:00 | comment | added | Floris | @Ben51 are you referring to the fact that from a Fourier transform perspective a sinusoid has a second harmonic? | |
| Jan 23, 2018 at 18:26 | comment | added | Ben51 | @Floris You would think that, being forced by solar heating, the atmospheric tides would be diurnal. But they are semidurnal. The solar heating signal is basically a truncated sinusoid, being zero all night, and thus has a large semidurnal component. And in terms of the effect on atmospheric pressure, especially in the tropics, this semidiurnal component dominates. | |
| Aug 23, 2015 at 2:34 | comment | added | Floris | Absolutely correct that variation due to solar heating exists - not sure that is a "tide" in the sense the OP intended. The article I linked mentions that gravitational tides exist (with a roughly 12-hour period), but they are MUCH weaker than the (diurnal - 24 hour cycle) variation due to solar heating. I pulled out the relevant quote and added it to my answer | |
| Aug 22, 2015 at 22:43 | history | answered | David Hammen | CC BY-SA 3.0 |