<p>The deep-sea temperature was <span class="math-container">$12º$</span>C higher <span class="math-container">$50$</span> My ago.</p>

<p>I would like to know how much the atmospheric pressure at sea level had decreased and how much the water-vapour changed.<br>
One can consider no ice-sheets and that the sea surface temperature varyed by the same amount and that by now there is <span class="math-container">$0$</span>% of water vapor in the atmosphere (in fact it is between 0% and 4% function of latitude and altitude and assume the conservation of atmospheric masses of <span class="math-container">$O_2, N_2$</span>).  </p>

<p>Edit add:<br>
This issue is very important because in this paper:<br>
<a href="https://science.sciencemag.org/content/362/6419/eaat1327" rel="nofollow noreferrer">"Temperature-dependent hypoxia explains biogeography and severity of end-Permian marine mass extinction"</a> is established a link between an increase of the global temperature by 10ºC and the Great Dying global extinction via a global hypoxia.
The solubility of O2 in water is function of the temperature, <strong>atmospheric pressure</strong> and salinity and the paper only mentions the temperature.</p>

<p>EDIT ADD<br>
This is a call to moderators to return this question to the PSE site where it was originally formulated.</p>

<p>This question is specifically formulated in the field of thermodynamics with matter subject to a gravitational field and the most appropriate site to get a correct answer is the PSE as the numbers clearly show:
On the Physics website (PSE) there are 8,489 active issues marked with Thermodynamics and in this EarthScience site there are only 122 questions.
 
I will offer a bounty of 500 points as a reward for the first correct answer after it is returned to the correct site.</p>

CC BY-SA 4.0
2019-04-29T11:45:01.860Z
This would probably be a better fit on [earthscience.se].
JMac
CC BY-SA 4.0
2019-04-29T12:31:45.110Z
An increase of temperature ->  more water vapour in the atmosphere  -> larger weight of atmosphere -> an increase of surface pression -> increase the number of $O_2$ molecules with larger kinetic energy in contact with the water surface per cm² -> increase of $O_2$ solubility in water.  
After a proper answer to this thermodynamic question I will post a continuation question in Earth Science involving the evolution of Life.
Helder Velez
CC BY-SA 4.0
2019-04-30T00:05:17.057Z
Here is an [Oxygen solubility chart](https://www.shipcopumps.com/media/images/OxygenSolubility-Chart1.jpg). It doesn't look like a small % increase in pressure would make much difference.
Keith McClary
CC BY-SA 4.0
2019-05-09T00:43:46.990Z
pls..I'wanting answers with thermodynamics expertise because I'm saying that a peer-reviewed doc is in error and sometimes my intuition can go wrong.. Sources that I' using: the textbook 'Thermodynamics of Atmospheres & Oceans by Judith A. Curry ...', Videos on youtube and Kahn Academy, Mit Courses, etc about Thermodynamics, Thermo-Calc software package etc. 'Prediction of oxygen solubility in pure water and brines up to high temperatures and pressures
Ming GENG, Zhenhao DUAN' and 'Solubility of Hydrogen, Oxygen, Nitrogen, and Helium in Water at Elevated Temperatures'
H. A. Pray,,1952'
Helder Velez
<thermodynamics><pressure><temperature>
How much increase in the atmospheric pressure when the global temperature is elevated by 12 C?
Helder Velez
# How much increase in the atmospheric pressure when the global temperature is elevated by 12 C?

(Asked by: username_0 on 2019-04-29)

The deep-sea temperature was $12º$C higher $50$ My ago.

I would like to know how much the atmospheric pressure at sea level had decreased and how much the water-vapour changed.  
One can consider no ice-sheets and that the sea surface temperature varyed by the same amount and that by now there is $0$% of water vapor in the atmosphere (in fact it is between 0% and 4% function of latitude and altitude and assume the conservation of atmospheric masses of $O\_2, N\_2$).

Edit add:  
This issue is very important because in this paper:  
["Temperature-dependent hypoxia explains biogeography and severity of end-Permian marine mass extinction"](https://science.sciencemag.org/content/362/6419/eaat1327) is established a link between an increase of the global temperature by 10ºC and the Great Dying global extinction via a global hypoxia.
The solubility of O2 in water is function of the temperature, **atmospheric pressure** and salinity and the paper only mentions the temperature.

EDIT ADD  
This is a call to moderators to return this question to the PSE site where it was originally formulated.

This question is specifically formulated in the field of thermodynamics with matter subject to a gravitational field and the most appropriate site to get a correct answer is the PSE as the numbers clearly show:
On the Physics website (PSE) there are 8,489 active issues marked with Thermodynamics and in this EarthScience site there are only 122 questions.
 
I will offer a bounty of 500 points as a reward for the first correct answer after it is returned to the correct site.

**Tags:** thermodynamics, pressure, temperature

> **Comments:**
> **username_1**: This would probably be a better fit on [earthscience.se].  
> **username_0**: An increase of temperature ->  more water vapour in the atmosphere  -> larger weight of atmosphere -> an increase of surface pression -> increase the number of $O_2$ molecules with larger kinetic energy in contact with the water surface per cm² -> increase of $O_2$ solubility in water.   After a proper answer to this thermodynamic question I will post a continuation question in Earth Science involving the evolution of Life.  
> **username_2**: Here is an [Oxygen solubility chart](https://www.shipcopumps.com/media/images/OxygenSolubility-Chart1.jpg). It doesn't look like a small % increase in pressure would make much difference.  
> **username_0**: pls..I'wanting answers with thermodynamics expertise because I'm saying that a peer-reviewed doc is in error and sometimes my intuition can go wrong.. Sources that I' using: the textbook 'Thermodynamics of Atmospheres & Oceans by Judith A. Curry ...', Videos on youtube and Kahn Academy, Mit Courses, etc about Thermodynamics, Thermo-Calc software package etc. 'Prediction of oxygen solubility in pure water and brines up to high temperatures and pressures Ming GENG, Zhenhao DUAN' and 'Solubility of Hydrogen, Oxygen, Nitrogen, and Helium in Water at Elevated Temperatures' H. A. Pray,,1952'  

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