The Ocean Physics Behind Net Zero
ฝัง
- เผยแพร่เมื่อ 4 ต.ค. 2024
- Why is the deep ocean cold? And why does this matter for global warming?
Doing the maths with pipes and plumbing, not computers, we explore how processes that keep the deep oceans at frigid Arctic temperatures also determine how fast the world is warming in response to rising greenhouse gas concentrations - and also explain why it would be so difficult to say when the warming would stop even if we were to stabilize greenhouse gas concentrations at today’s levels forever.
A lecture by Myles Allen recorded on 31 January 2023 at Barnard's Inn Hall, London
The transcript and downloadable versions of the lecture are available from the Gresham College website:
www.gresham.ac...
Gresham College has offered free public lectures for over 400 years, thanks to the generosity of our supporters. There are currently over 2,500 lectures free to access. We believe that everyone should have the opportunity to learn from some of the greatest minds. To support Gresham's mission, please consider making a donation: gresham.ac.uk/...
Website: gresham.ac.uk
Twitter: / greshamcollege
Facebook: / greshamcollege
Instagram: / greshamcollege
Excellent informative for layman such as myself..very well articulated and plz never stop your incredible work ..thank you 💗
A Joule is the heat from one Amp going through one ohm for one second. A calorie is the heat needed to raise one gram of water one degree centigrade. A large Calorie, capital C, raises 1 kg of water o e degree, and is now called a kilocalorie.
Thanks. How many Joules make a kilocalorie? That would allow us to calculate how much warming 700 Zeta Joules means in terms of the Ocean/Land/Air complex.
Wouldn't the melting of glaciers and ice caps bring the deep water temperature down, again masking the energy accumulation and flooding coastal regions - and when all the ice has melted, that would be equivalent to closing the outflow on the large pipe, which would soon escalate the level in the small pipe?
@@ulicadluga short answer 4.18 joules per short calorie, 4186 joules per kilocalorie.
@@ulicadluga I'm having some problems getting my comments posted, so in short the graph at 19m00s is from a preprint paper called essd-2022-239.pdf, and shows a 370 ZJ rise from 1960 to 2020, about 6 ZJ a year.
@@johnbunyan3070 Thanks. Great to have real world numbers to work with.
16:01 And the difference between the greenhouse/non-greenhouse equatorial zones/non-equatorial zones. Even Saint NASA hasn't been able to model those two titans accurately yet. Needs more Disney Magic Dust I should surmise.
Best explanation of climate change so far!
That pipe model didn't help. I think introducing even those simple equations confused thing, and it could be explained well enough in English. Never liked this kind of approach when I worked at UKMO
42:20 No, it's not going to take that long. Nowhere near that long. We're on this, more than you think.
Let's see if we can melt the ice caps and all the other stuff guys! Goals!
So how to cool hot tropical air, with the help of cool deep sea water? Do we push hot or warm air through pipe into deep ocean, to circulate back again to us as cold air, or what.
Had to give up. 10 minutes in and the guy has already told us to eat ice as a survival tip (wrong, you melt it first) and that water has a memory.
Hi
nope
Clear as mud umm, erhm muddy mud erhm...🙄 you know, roughly, umm, well, hang on... 🤦♂️
What a joke. Trying to explain thermodynamics with fluid mechanics is like explaining surgery using knitting. Similar in simpleton terms only.
show us the 'disappointing' line, anyway.
too many people have no sense of proportion these days and use science to see what they want.
you can thank Einstein and his Merry Mystery Cult for that old chap