Leon Hermanson

Predictability researcher for seasonal to decadal time scales with a focus on the North Atlantic. Also studies storms and surfs the waves they create.

[Dr. Robert Rohde @RARohde]

In case anyone is wondering, about 1/2 of the 150 million tonnes of water vapor injected into the stratosphere by the extremely violent Hunga Tonga eruption (January 2022) is still there.

A fascinating natural experiment for upper atmospheric chemistry and dynamics.

🧵

[Leon Hermanson @LeonHerm]

Are you looking to work at the interface of weather, climate, and energy security to prepare us for reaching NetZero? This permanent post may be of interest: https://t.co/sBTRV4Fr9i

[Massimo @Rainmaker1973]

In 1890, Henri Poincaré proved the non-existence of the uniform first integral of the three-body problem and the sensitive dependence to initial conditions of its trajectories.

Yet, stable solutions to it do exist and these are some of them.

[Guillaume Maze @mazeguillaume]

🌊🎉 #argofloat network just hit a monumental milestone with its 3,000,000th profile!
Celebrating 20 years of in-situ, real-time, global, multi-disciplinary and free-access ocean data that has been revolutionizing modern oceanography for 20 years! #OceanScience #Argo3Million

[A. Düsterhus @aduesterhus]

Final day at #egu24
Today we have from 8.30 am three great sessions of seasonal to (multi-)decadal predictions and their applications. Join us!

[Peter Cox @coxypm]

Our new emergent constraint paper is now out in @NatureComms! This one reduces uncertainty in arguably the most policy-relevant numbers to come from climate science: the global carbon budgets consistent with the Paris targets. @GSI_Exeter @exeter
https://t.co/ZSPgh4kfGc

[Toby P Jones @tobyp_jones]

This is so cool! Nice to visualise temperatures on a sphere rather than a projection of it!

[Jon Robson @JonIRobson]

New paper!

North Atlantic response to observed North Atlantic oscillation surface heat flux in three climate models, by Kim et al. (Including @yohan_R_R and me!)

https://t.co/rWtWttZAZD

[Lijing Cheng @Lijing_Cheng]

[1/12] Now 2023 Ocean Data is out! Global 2023 upper 2000 m ocean heat content was the highest ever recorded by modern instruments, 15 ZJ higher than 2022 for IAP data (https://t.co/qZmzOeOe6v) with a major update of IAP time series since 1940 (https://t.co/WYLpOG9Rtv)

[A. Düsterhus @aduesterhus]

Another two days to submit an abstract for #EGU24 Still looking for a session and you work on seasonal to decadal predictions? Take a look at CL4.3: " Seasonal to multi-decadal climate predictions and their applications" https://t.co/Pxcs8HM6xT #s2d

[@MetOfficeCE @metofficece]

I think it’s also worth linking to our post from this time last year where we were highlighting the near-certainty of the hottest year on record and likelihood of a year above +1.5 C in the next five years https://t.co/sORV6CFLKv

[Zeke Hausfather @hausfath]

November 2023 global surface temperatures are now out from ERA5 as well as JRA-55. Both show this November as the warmest on record by a large margin (~0.3C).

JRA-55 has this November at 1.6C above preindustrial levels, while ERA5 has it at 1.7C.

[Prof Richard Betts @richardabetts]

Approaching 1.5°C: how will we know we’ve reached this crucial warming mark?

The Paris Agreement does not define "temperature rise", so recognition of 1.5°C being reached may be delayed

In @nature we propose the Current Global Warming Level metric

https://t.co/3XLf3cNTS9

[Met Office Science @MetOffice_Sci]

Dr @chrisd_jones, Manager for Earth System & Mitigation Science, Doug Smith, Lead for Decadal #Climate Research, Prof Adam Scaife, Lead for Monthly to Decadal Prediction, & Prof Lizzie Kendon, Strategic Head Understanding Climate Change feature on the @Clarivate list 👇

[Leon Hermanson @LeonHerm]

What might happen when the world has warmed 1.5 degrees C? Some thoughts presented in @SDG_Action: https://t.co/mIWHE1uMJr #COP28

[Leon Hermanson @LeonHerm]

Read this about how storms like Babet and Ciarán will become more frequent with climate change and then look at the video below to cheer yourself up: https://t.co/KIBxahscuo

[Climate Science Breakthrough @ClimateSciBreak]

Climate scientists are tearing their hair out, so why are millions not in the streets demanding #ClimateActionNow?

Watch and share @MrNishKumar helping @FrediOtto rouse the masses in the latest punchy "Climate Science Translated" video! 🔥🌎

#NoNewOil #ClimateCrisis #Language

[Leon Hermanson @LeonHerm]

Ever wonder what it will be like when heating due to humans reaches 1.5 degrees C? I think 2023 has given us some hints: https://t.co/mIWHE1uMJr @SDG_Action

[Leon Hermanson @LeonHerm]

How can anyone argue that it is too expensive to do more to cut greenhouse gases when climate change is estimated as already costing us $140 billion a year?! https://t.co/YQHb7cwAlO

[andrew gao @itsandrewgao]

Go to Google Scholar and look up ‘As an AI language model” -“ChatGPT”’

[@borenbears @borenbears]

Watch out. NOAA is doubling the odds that this hurricane season will be above normal, increasing the number of storms forecast. It's already a busy year with 5 named storms so far (2 is normal for this time of year). Why? Hot oceans, tardy El Nino. https://t.co/bRTIKAYzIm