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Post by acidohm on Sept 22, 2018 5:48:00 GMT
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Post by nautonnier on Sept 22, 2018 10:01:45 GMT
There are several papers on this effect. One theory is that the meridonal jetstreams as the Rossby waves slowly progress around the Earth will eventually interact with the Himalayas this is more likely when the level of the tropopause and thus the jetstreams are lower in Northern Hemisphere winter. The orographic effect is to force the jetstream upward into the stratosphere or to be more precise the Troposphere rises as a wave in the tropopause which then 'breaks' and causes a sudden downburst into the Arctic that can reverse the polar vortex and the associated lower level winds. Resultant easterlies can cause a significant temperature drop.  There are probably other causes for breaking waves in the tropopause at the pole, it is these breaking waves cause the SSW. I have not heard of SSW in the Antarctic that has no equivalent mountain ranges, so perhaps the Tibetan Plateau uplift is the main cause. |
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Post by acidohm on Sept 22, 2018 13:47:18 GMT
There are several papers on this effect. One theory is that the meridonal jetstreams as the Rossby waves slowly progress around the Earth will eventually interact with the Himalayas this is more likely when the level of the tropopause and thus the jetstreams are lower in Northern Hemisphere winter. The orographic effect is to force the jetstream upward into the stratosphere or to be more precise the Troposphere rises as a wave in the tropopause which then 'breaks' and causes a sudden downburst into the Arctic that can reverse the polar vortex and the associated lower level winds. Resultant easterlies can cause a significant temperature drop. There are probably other causes for breaking waves in the tropopause at the pole, it is these breaking waves cause the SSW. I have not heard of SSW in the Antarctic that has no equivalent mountain ranges, so perhaps the Tibetan Plateau uplift is the main cause. Apparently they do, but are far more rare. earth-planets-space.springeropen.com/articles/10.1186/s40623-017-0704-5 |
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Post by acidohm on Jan 29, 2019 17:39:08 GMT
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Post by sigurdur on Jan 29, 2019 19:02:39 GMT
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Post by sigurdur on Jan 29, 2019 19:11:59 GMT
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Post by sigurdur on Jan 29, 2019 19:14:06 GMT
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Post by Ratty on Jan 30, 2019 0:37:06 GMT
" Conclusion
70-90 years oscillations in global mean temperature are correlated with corresponding oscillations in solar activity. Whereas the solar influence is obvious in the data from the last four centuries, signatures of human activity are not yet distinguishable in the observations." I wonder if K.Lassen is still working in the industry?
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Post by missouriboy on Jan 30, 2019 3:22:52 GMT
" Conclusion
70-90 years oscillations in global mean temperature are correlated with corresponding oscillations in solar activity. Whereas the solar influence is obvious in the data from the last four centuries, signatures of human activity are not yet distinguishable in the observations." I wonder if K.Lassen is still working in the industry? Do you suppose that this article could be published in Science today? |
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Post by missouriboy on Feb 11, 2019 3:22:42 GMT
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Post by acidohm on Feb 11, 2019 21:13:36 GMT
Fantastic link Missouri!! Thankyou 😊😊 Going to take a bit of time to follow all links in comments etc! (Theres some familiar names there....) |
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Post by nautonnier on Sept 3, 2019 13:22:46 GMT
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Post by nautonnier on Sept 7, 2019 19:55:38 GMT
Acid may have seen this already.... |
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Post by acidohm on Sept 7, 2019 20:20:38 GMT
Acid may have seen this already.... Yes 😉 Were just still in that long protracted wait arnt we... After this Feb I'm keenly aware that anything can happen, its just.....what? |
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Post by nautonnier on Sept 7, 2019 21:35:40 GMT
Acid may have seen this already.... Yes 😉 Were just still in that long protracted wait arnt we... After this Feb I'm keenly aware that anything can happen, its just.....what? Ratty walking out over the Brisbane pack ice to the Barrier Reef? |
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