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We know the Global Mean Temperature is increasing due to climate change. But for the Global Mean Atmosphere Pressure, can we see an obvious trend?

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  • $\begingroup$ A very interesting question, would think by Ideal Gas Law it should be, going up by about 3 or 4 mb (for a degree Celsius warming), or in some combination with a similar scale density decrease (unless extra mass is lost to space). I expect the discrepancy in such may lie with the connected cooling of the stratosphere too? But I'm no expect on the topic, so hopefully others have more thorough answers they know rather than guesses. $\endgroup$ Dec 14 '21 at 13:39
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    $\begingroup$ As there is increasing the global total water vapour content....... $\endgroup$
    – Poutnik
    Dec 15 '21 at 10:49
  • $\begingroup$ @Poutnik was going to say that vapor pressure is relatively quite small... but it actually goes up about a mb (= 0.1 kPa) per °C increase in dew point in the region of average temperatures... so that'd be a decent contribution. Some may say "it's lighter than air"... but unless it's removing air somehow from the atmosphere, it's still increasing pressure overall? $\endgroup$ Dec 16 '21 at 7:47
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    $\begingroup$ @JeopardyTempest If we neglect light decreasing of gravity with altitude, the pressure would be numerically equal the weight of the thought air column ( well, conus ) mass above the unit surface area. And if we increase the mean mass...... $\endgroup$
    – Poutnik
    Dec 16 '21 at 7:56

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