There are two main satellite datasets and they both get their data from the same place, but handle the corrections differently. Satellites without onboard propulsion tend to drift back towards Earth ,which changes the measurements 1/
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Replying to @Travistown @ScottAdamsSays
The satellites use microwave sounding units to measure emissions from oxygen molecules, which has been shown to be a good proxy for temperature. Since they measure it the bulk atmosphere, the scientists have to decide what part is the troposphere, stratosphere, etc. 2/
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Replying to @Travistown @ScottAdamsSays
This has caused some adjustments over the years when outside scientists have scrutinized and criticized the results. The satellites cover about 80% of the globe including the OCEANS with limited coverage at the poles due to their orbits. 3/
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Replying to @Travistown @ScottAdamsSays
Now here comes the good part: UAH- Dr. Roy Spencer and Dr. John Christy routinely compare their results with RSS- Dr. Carl Nears’ results. They also compare to the balloon datasets. In case you don’t know, weather balloons are regularly released around the world sending data...4/
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Replying to @Travistown @ScottAdamsSays
...back to Earth. They measure temperature as they go up, as well as a lot of other things. It turns out that the satellites and balloons are in very close agreement going back to 1979 and the terrestrial datasets show drastically more warming. 5/
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Replying to @Travistown @ScottAdamsSays
One could say then that the satellite temperature record has independent verification by the weather balloon datasets. Also RSS and UAH are on different sides of the climate debate and yet their results from the same original data are also in close agreement 6/
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Replying to @Travistown @ScottAdamsSays
When looked at logically and scientifically this should tell us not to discount the satellite records, but to rely on them even more. http://www.remss.com/measurements/upper-air-temperature/validation/ … end/
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Replying to @Travistown @ScottAdamsSays
Should have been Dr. Carl Mears. Temperature trend per decade: UAH-0.13C, RSS-0.17C, climate model mean-0.27C
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Replying to @Travistown
It doesn’t measure land or ocean. I think that’s the issue.
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Replying to @ScottAdamsSays
They have ways of dissecting the data into regions of land, ocean, S. Hemisphere, N. Hemisphere, lower 48, etc., but I don’t know the details on that. But since the issue is global warming, having a bulk atmospheric measurement of temps. is very valuable. http://www.drroyspencer.com/2019/01/uah-global-temperature-update-for-december-2018-0-25-deg-c/ …
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And those ways disagree with land measurements. Therefore we should probably discount satellite measurements as useless.
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