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Post by boombo on Jan 25, 2018 10:55:52 GMT -5
We've just had a conversation in the shoutbox that deserves a thread of its own IMO: what would the climate be like of a 9000-metre high plateau at the South Pole?
Would lapse rates still work the same way they do at lower elevations at lower latitudes? What would the temps/windchill be like? Would it be almost permanently above any clouds in the area? What kind of microclimates would it create around it?
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Post by alex992 on Jan 25, 2018 11:06:10 GMT -5
I actually changed it to a plateau instead of a mountain, as I think it would cause even colder temps lol. So essentially the South Pole with the same topography/geography as now, but 6200 m higher in elevation lol.
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Post by Deleted on Jan 25, 2018 11:07:51 GMT -5
interesting topic. 9000 masl at the poles probably is in the statosphere, so the temperature would start to increase instead of decrease with height at some point. or am i wrong?
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Post by boombo on Jan 25, 2018 11:10:19 GMT -5
I just changed the thread topic to say a plateau haha, but I'd still be curious about what a mountain that high would be like.
I assume it would be above the cloud base, probably one of the sunniest places on Earth.
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Post by alex992 on Jan 25, 2018 11:35:27 GMT -5
interesting topic. 9000 masl at the poles probably is in the statosphere, so the temperature would start to increase instead of decrease with height at some point. or am i wrong? Looks like the stratosphere at the poles starts at about 8000 m, so yeah it would be about 1000 m into the stratosphere, though maybe 1000 m isn't enough to cause much significant warming? I still would think it'd be a lot colder than 2800 m though. How much colder is the question? |
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Post by nei on Jan 25, 2018 15:06:53 GMT -5
Mean winter temperatures at 300 hPa; roughly 8200-8600 m. Since it’s open air temperatures, it’s more useful for what a high, isolated mountain would be rather than plateau. Yes, it's warmer than Vostok; the polar night creates a strong inversion.  Relative humidity  Air is very dry; too dry for any clouds. This is average; so not great measure of cloudiness but if the mean humidity is 10%; saturated cant happen too often |
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Post by nei on Jan 25, 2018 23:50:21 GMT -5
here's a radiosonde from the South Pole  from journals.ametsoc.org/doi/full/10.1175/JCLI3360.1#from the link There is a rapid warming with height very near the surface, with a nearly isothermal layer above that from about 250–900 m. Above that the profile transitions to a more normal lapse of temperature with height. Focusing on Fig. 3b, it is possible to see just how rapid the warming is near the surface. By just 40 m above the surface the temperature is 15 K higher than at the surface, and by 100 m the temperature has risen by 20 K of the total 23-K increaseso Antarctica has a normal lapse rate once you get above the lower-level inversion; but you'd need to get 900 m for the lapse rates to get normal. Radiosonde and map has 300 hPa level at about a mean of -65°C in winter, would a plateau at 9000 m create the same inversion? If it did, the temperature of the pleateau in winter would be 20°C colder than the open air would be otherwise, mean of -85°C. Maybe even a bit colder? It's still high to reach the tropopause, which is very high there in winter; temperatures keep cooling for another 6 km higher, so plenty of cold air to pool. Open air from outside the plateau could break the inversion, but the interior of Antarctica isn't stormy; the lows hover around the coast.  |
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Post by Hiromant on Jan 26, 2018 5:56:31 GMT -5
Looks like Göle to me.
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