If anything, switching to proxies vs the instrumental record (which I originally thought was the object of your musings) spreads out the network of "gatekeepers" dramatically - every expedition to get an ice core, every tree ring group, every coral study, etc.
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They cover enough :) (And you can statistically account for what you don't in the error budget)pic.twitter.com/8f7kntZ9JL
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I used to do forecasting. You just said "guessing."
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Temp anomalies are correlated over very long distances; as a result, only a very sparse sampling of the Earth's surface is necessary to prove that the planet is warming. Here are results computed from just 30 stations (30-station-raw(green)&adjusted(blue) compared with NASA(red).pic.twitter.com/pzbi1iWsO7
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I hope these results have convinced you that the NASA global temperature results are robust. Confirming the warming reported by NASA requires <1% of the temperature stations that NASA uses; the GHCN network of global temperature stations is massively redundant for that purpose.
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