<p>Climate change will increase the size of stalled high-pressure weather systems called &quot;blocking events&quot; that have already produced some of the 21st century's deadliest heat waves, according to a Rice University study.</p>
<p><a href="https://www.sciencedaily.com/releases/2019/11/191113075107.htm" rel="nofollow noreferrer">https://www.sciencedaily.com/releases/2019/11/191113075107.htm</a></p>
<p>Atmospheric blocking events are middle-latitude, high-pressure systems that stay in place for days or even weeks. Depending upon when and where they develop, blocking events can cause droughts or downpours and heat waves or cold spells.</p>

CC BY-SA 4.0
2022-01-29T16:46:59.817Z
But the global mean pressure depends  on the atmosphere mass, different synoptic pressure distribution alone has negligible effect, connected to slight change of gravity with altitude.
Poutnik
CC BY-SA 4.0
2022-01-30T06:04:27.060Z
this does not realy answer the question will the air pressure change as a result of the expanding warmer air,i think the pressure will stay the same as warmer air is lighter and there is(no phun intended)a lot of space for expansion.
trond hansen
CC BY-SA 4.0
2022-01-31T02:21:03.350Z
The question was: can we see an obvious trend? --- We observe the trend of increased size of stalled high-pressure systems. We can also observe increased cloud hight and lapse rate. We know that the top of the troposphere(-60°C) is ~16km at the equator and only ~ 7km at the poles and tends to be higher in summer. The expansion is thus confined to the troposphere and the volume of the atmosphere as a whole remains the same. The earth gets rid of the increased temperatures and energy solely through long-wave radiation and not through expansion into space or constantly increasing air pressure.
Rammstein
CC BY-SA 4.0
2022-01-29T15:19:05.900Z
2022-01-29T15:19:05.900Z
Rammstein
<p>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?</p>

CC BY-SA 4.0
2021-12-14T13:39:04.527Z
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.
JeopardyTempest
CC BY-SA 4.0
2021-12-15T10:49:30.017Z
As there is increasing the global total water vapour content.......
Poutnik
CC BY-SA 4.0
2021-12-16T07:47:11.180Z
@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](http://www.msduncanchem.com/Reference_Tables/water_vapor_pressure_chart.htm) 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?
JeopardyTempest
CC BY-SA 4.0
2021-12-16T07:56:40.213Z
@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......
Poutnik
<meteorology><climate-change><atmosphere>
Is Global Mean Surface Atmosphere Pressure changed long-term by global warming?
mqzhang
# Is Global Mean Surface Atmosphere Pressure changed long-term by global warming?

(Asked by: username_0 on 2021-12-14)

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?

**Tags:** meteorology, climate-change, atmosphere

> **Comments:**
> **username_1**: 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.  
> **username_2**: As there is increasing the global total water vapour content.......  
> **username_1**: @username_2 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](http://www.msduncanchem.com/Reference_Tables/water_vapor_pressure_chart.htm) 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?  
> **username_2**: @username_1  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......  

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## 1 answers

### Answer by username_3 on 2022-01-29. Score: -2

Climate change will increase the size of stalled high-pressure weather systems called "blocking events" that have already produced some of the 21st century's deadliest heat waves, according to a Rice University study.

<https://www.sciencedaily.com/releases/2019/11/191113075107.htm>

Atmospheric blocking events are middle-latitude, high-pressure systems that stay in place for days or even weeks. Depending upon when and where they develop, blocking events can cause droughts or downpours and heat waves or cold spells.

> **Comments:**
> **username_2**: But the global mean pressure depends  on the atmosphere mass, different synoptic pressure distribution alone has negligible effect, connected to slight change of gravity with altitude.  
> **username_4**: this does not realy answer the question will the air pressure change as a result of the expanding warmer air,i think the pressure will stay the same as warmer air is lighter and there is(no phun intended)a lot of space for expansion.  
> **username_3**: The question was: can we see an obvious trend? --- We observe the trend of increased size of stalled high-pressure systems. We can also observe increased cloud hight and lapse rate. We know that the top of the troposphere(-60°C) is ~16km at the equator and only ~ 7km at the poles and tends to be higher in summer. The expansion is thus confined to the troposphere and the volume of the atmosphere as a whole remains the same. The earth gets rid of the increased temperatures and energy solely through long-wave radiation and not through expansion into space or constantly increasing air pressure.  

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