Geoff Vallis

Climate dynamicist, GFDer, oceanographer, planetary scientist.

[Geoff Vallis @GeoffVallis]

Important to note that our conclusions depend not just on the results of model integrations, but on our understanding of the mechanisms involved. Still, little is certain in this business, and it does not mean the risk of collapse is not there, even if we think it is unlikely.

[Jon Baker @jonbaker_ocean]

🌊 Today in @Nature: Is the AMOC on the brink of collapse?

Unlikely before 2100—but the risks are real 🚨

We find Southern Ocean winds keep this vital ocean “heat engine” running, even under extreme #climatechange. But the Pacific holds a surprise…

Let’s explore 🧵👇

[Steve Tobias @StevenTobias7]

It's taken a while! We finally managed to show how to do Generalised Direct Statistical Simulation. Paper in @JFluidMech.
https://t.co/W7JApkzHNA

[Geoff Vallis @GeoffVallis]

Obviously, teaching mathematics (which Lehrer chose to do) is just some obscure profession not worthy of the finer minds. Who knew?
https://t.co/EOgoeY3yEu

[Geoff Vallis @GeoffVallis]

@CColose Any chance of axis or curve labels on the figure? :)

[Geoff Vallis @GeoffVallis]

Not only was the late Jimmy Buffett a great songwriter, but he also understood the profound differences in atmosphere/ocean dynamics between mid-latitudes and equatorial regions...

[Geoff Vallis @GeoffVallis]

The article itself isn't so bad, and gives a reasonable account of some topical research. But in true #Guardian style the headline is doom-laden and melodramatic. It doesn't help. And what was once a fine newspaper has become a tabloid.

[Geoff Vallis @GeoffVallis]

Oh dear.
https://t.co/wRnmNrMJsC

[Geoff Vallis @GeoffVallis]

The Gulf Stream is a wind-driven current. It isn't going to collapse unless the winds cease or the Earth stops rotating, neither of which will happen soon. The AMOC is a different beast, but the headline might equally well have said 'The AMOC is unlikely to collapse by 2025'.

[Layal Hakim @DrLayalHakim]

Very happy to be promoted to associate professor @UniofExeter! It’s a pleasure working at a place that fosters excellence in education. I’m grateful to my colleagues, friends & family for their support 🙂

More innovations and collaborations to come! But now time to celebrate! ❤️

[Exeter Uni Jobs @UoE_Jobs]

The Department of #Mathematics and #Statistics at the University of Exeter is seeking to appoint two #Lecturers to join our Dynamical Systems and Analysis group. To find out more: https://t.co/gCcNm4jgIv

[Matthew Henry @mattjohenry]

New preprint on the maximization of climate sensitivity at 310K.
https://t.co/1ynvLYMoCl

[Geoff Vallis @GeoffVallis]

The sad thing about twitter is that, although many of the tweets yesterday were evidently meant to mark the day (April 1), they were barely less believable than many in the usual crop.

[Geoff Vallis @GeoffVallis]

@StevenTobias7 Indeed.

[Geoff Vallis @GeoffVallis]

@JemmaShipton @jmak_1020 I aim to please all my customers.

[oscar rguezderivera @orrortega]

Very excited to be joining @ExeterUniMaths from May!! I will miss my colleagues @UniKentSMSAS and @UniKentSEaK but looking forward to new adventures @UniofExeter!

[Geoff Vallis @GeoffVallis]

@StevenTobias7 I think it happens in the US to some degree, but not as much as the UK. The whole high-school and university education system here doesn't help. Sunak's proposal was at least well-intentioned, but needs some work.

[Campaign for Mathematical Sciences (CaMS) @campaignmathsci]

Professor Ulrike Tillmann, President of the London Mathematical Society, responds to the Prime Minister's Speech on behalf of the Protect Pure Maths campaign:

[Steve Tobias @StevenTobias7]

Happy new year! What better way to celebrate being back in work than to read about theories of inhomogeneous and anisotropic turbulence? Well you're in luck. Just published by @AnnualReviews
of Fluids. Review by @Brad_Marston and me...

https://t.co/Qs9KP1r2UO

[Geoff Vallis @GeoffVallis]

@JanDZika Sad news. His tracer release experiments were indeed transformative, and will have a lasting impact. He was also a very nice person.

[Geoff Vallis @GeoffVallis]

@kyz1024 If I were in SIAM I would vote for you. And that is reason enough to join.