this post was submitted on 18 Nov 2023
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How much each change to the atmosphere has warmed the world: IPCC AR6 Figure 2 - Thee bar charts: first chart: how much each gas has warmed the world.  About 1C of total warming.  Second chart:  about 1.5C of total warming from well-mixed greenhouse gases, offset by 0.4C of cooling from aerosols and negligible influence from changes to solar output, volcanoes, and internal variability.  Third chart: about 1.25C of warming from CO2, 0.5C from methane, and a bunch more in small quantities from other gases.  About 0.5C of cooling with large error bars from SO2.

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If no immediate action is taken to counter the harm, desalination, in combination with climate change, will increase the Gulf’s coastal waters temperature by at least five degrees Fahrenheit across more than 50 percent of the area by 2050, according to a 2021 study published in the Marine Pollution Bulletin on ScienceDirect, a site for peer-reviewed papers.

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[–] Jax@sh.itjust.works 7 points 1 year ago* (last edited 1 year ago) (3 children)

Wait, desalination causes seawater temperatures to rise?

[–] silence7@slrpnk.net 3 points 1 year ago

Yes, with several common processes

[–] supper_time@lemmy.fmhy.net 1 points 11 months ago

I was curious too. The article mentions that Dubai’s old reverse osmosis systems rely on flash distillation which adds a lot of heat to the system and thus the brine being returned to the gulf waters.

“Unlike reverse osmosis, which removes salt and other contaminants by pushing water through a semipermeable membrane, multistage flash distillation relies on heat. Decades ago, when the U.A.E. began exploring desalination, the technology could better handle the Gulf’s high salinity, though reverse osmosis can now do the same. And although both technologies create brine, the byproduct of multistage flash distillation is far hotter, further disrupting the ecosystem.“

[–] downpunxx@kbin.social -1 points 1 year ago (1 children)

closed system, the less water there is to disperse heat energy it gains from sunlight/underwater vents, the more heat energy the water retains. it's basic mathematics.

[–] deur@feddit.nl 0 points 1 year ago (1 children)

It seems like you do not know how the water cycle works, even though you posted about this theory twice.

[–] downpunxx@kbin.social 2 points 1 year ago

yes, please do explain about the water cycle in and off a desert peninsula surrounded for thousands of miles by nothing but salt water and deserts. you're only going to need to explain it to me once though, lol, don't forget the thermodyanics

[–] downpunxx@kbin.social 1 points 1 year ago

As it turns out, Earths ecosphere is a close system surrounded by lifeless cold space. One action, begets another equal and opposite reaction. When you reduce the amount of water volume into a system being heated by the sun and underwater thermal vents, that water will get and remain hotter, longer. I mean, who knew, right.