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Post by glennkoks on Sept 16, 2020 1:31:49 GMT
I like David's videos. He is a smart guy who at the minimum gives us things to think about. And we know North Africa was a major grain producer in Roman times. With that being said I think his predictions for the Grand Solar Minimum are a little far fetched. Time will tell.
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Post by acidohm on Sept 22, 2020 18:20:31 GMT
this guy has pulled off a series of very well put together diagrams/graphs.
It also highlights something I've said a few times, real cold comes from position of pressure systems....cold N Atlantic has an effect, but when the air comes from arctic/siberia, that's synoptics.
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Post by acidohm on Sept 22, 2020 20:11:19 GMT
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Post by missouriboy on Mar 6, 2021 23:10:45 GMT
NAOs Constructed from Surface Pressures for the Azores-Iceland Corridor by Month (2008 to 2021) Left chart shows the huge declines in Summer NAO values that have occurred since 2018 in all summer months. Only June 2009 reached these lows. Aggregate summer values have not been this low since the exit slope of the Dalton Minimum back in 1821. Right chart shows monthly comparison of winters 2008 to 2021. The January 2021 NAO was lower than January 2010, but February 2021 did not reach the February 2010 low. Comparing the Gibraltar-Iceland NAO (chart 2) shows that these pressure gradients were not as low for January-February 2021 as the 2010 values. Does that mean that the atmospheric flow corriders were further west than in 2009 and 2010?  NOTE THAT THE TITLE FOR THE CHART BELOW IS WRONG. IT SHOULD READ (Gibraltar - Iceland) |
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Post by sigurdur on Mar 7, 2021 0:45:51 GMT
The February deviation is similar to 2010 in magnitude/speed of decline.
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Post by missouriboy on May 2, 2021 4:57:35 GMT
Surface Pressure Records for the Atlantic
Some pressure records for April for Iceland and the Azores. The average daily surface pressure for April 2021 in Reykjavik was the third highest recorded since 1821, exceeded only by 1929 and 1973. The average daily surface pressure for April 2021 at the Azores recording station was the lowest recorded since record keeping began in 1865. This results in a very negative NAO between these two stations ... the second lowest NAO ever recorded in any month ... exceeded only by January 1881.
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Post by Ratty on May 2, 2021 10:48:53 GMT
Surface Pressure Records for the Atlantic
Some pressure records for April for Iceland and the Azores. The average daily surface pressure for April 2021 in Reykjavik was the third highest recorded since 1821, exceeded only by 1929 and 1973. The average daily surface pressure for April 2021 at the Azores recording station was the lowest recorded since record keeping began in 1865. This results in a very negative NAO between these two stations ... the second lowest NAO ever recorded in any month ... exceeded only by January 1881. When looking at those dates, is there a message to be had? |
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Post by sigurdur on May 2, 2021 16:31:45 GMT
Surface Pressure Records for the Atlantic
Some pressure records for April for Iceland and the Azores. The average daily surface pressure for April 2021 in Reykjavik was the third highest recorded since 1821, exceeded only by 1929 and 1973. The average daily surface pressure for April 2021 at the Azores recording station was the lowest recorded since record keeping began in 1865. This results in a very negative NAO between these two stations ... the second lowest NAO ever recorded in any month ... exceeded only by January 1881. When looking at those dates, is there a message to be had? Yep..we are screwed |
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Post by Ratty on May 2, 2021 18:23:40 GMT
When looking at those dates, is there a message to be had? Yep..we are screwed Hot screwed or cold screwed? |
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Post by sigurdur on May 2, 2021 18:42:11 GMT
Hot screwed or cold screwed? In my area, cold screwed. 1973 was a cold spring followed by an early fall freeze. Hardddd freeze. |
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Post by Ratty on May 2, 2021 18:48:20 GMT
Hot screwed or cold screwed? In my area, cold screwed. 1973 was a cold spring followed by an early fall freeze. Hardddd freeze. It was about that time when I had a fireplace installed. Only used it for a few years .... |
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Post by nonentropic on May 2, 2021 18:48:40 GMT
Sig but you can be saved by ag prices.
Farmers tend to do better in bad times, not all but many smart ones just pray for universal misfortune.
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Post by sigurdur on May 2, 2021 18:59:58 GMT
Sig but you can be saved by ag prices. Farmers tend to do better in bad times, not all but many smart ones just pray for universal misfortune. True. |
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Post by nonentropic on May 2, 2021 20:37:06 GMT
Not sure if this is the correct thread but over the last 2 years the SH has been falling in temperature much faster than the NH. If the frequency content of the solar spectrum has reduced UV with a subdued sun rather than a reduction of gross energy emissions, I dispute this actually, but the SH has vastly more ocean surface that will not be warmed so much as a consequence. UV penetrates the surface, not other frequencies.
Could this be a sign of the times to come. I read somewhere that the frequency content is biased towards the IR which is instantaneously absorbed at the surface often resulting in the stripping off from the surface of the water some water vapour. More clouds could be the outcome, so less warming, etc.
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Post by nautonnier on May 2, 2021 20:47:50 GMT
Not sure if this is the correct thread but over the last 2 years the SH has been falling in temperature much faster than the NH. If the frequency content of the solar spectrum has reduced UV with a subdued sun rather than a reduction of gross energy emissions, I dispute this actually, but the SH has vastly more ocean surface that will not be warmed so much as a consequence. UV penetrates the surface, not other frequencies. Could this be a sign of the times to come. I read somewhere that the frequency content is biased towards the IR which is instantaneously absorbed at the surface often resulting in the stripping off from the surface of the water some water vapour. More clouds could be the outcome, so less warming, etc. That sounds right Infrared does not heat the ocean it cools it by enhancing the evaporation of the surface layer. UV and visible light can penetrate deep into the ocean and heat it as the radiation is absorbed. So the mix of wavelengths is more important than Total Solar Insolation |
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