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Denis Sergeev

@meteodenny.bsky.social
1.5K followers 242 following 42 posts

Lecturer in Astrophysics at the University of Bristol. I use numerical models to study planetary climates. Views are my own. He/him. dennissergeev.github.io ORCiD: 0000-0001-8832-5288

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Reposted by Denis Sergeev
Randall Munroe @xkcd.com · 15h
Planet Database xkcd.com/3311/
4-panel comic. (1) [Person 1 with shoulder-length hair sitting at a laptop with Person 2 standing behind her.] PERSON 1: I’m browsing the list of potentially habitable planets. This one is promising! Wait, no, the surface is thousands of degrees. (2) PERSON 1: This one could be a water planet! ...But it’s not dense enough to be solid. PERSON 2: Yeah, that’s a mini-Neptune. (3) PERSON 1: This one could be habitable if it has a greenhouse effect! Sadly, spectroscopy shows no atmosphere. PERSON 2: Aww. (4) PERSON 1: Here’s one in the habitable zone, 1 Earth mass, with an atmosphere! PERSON 2: Ooh, water star does it orbit? PERSON 1: ...Sol. PERSON 2: *Dammit.*
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Hannah Wakeford @stellarplanet.bsky.social · 14/10/2026
Planets are 3D! Shocking I know but when we measure an exoplanet we collapse the info into an average while assuming the planet is a perfect circle. UNTIL NOW! @lili-alderson.bsky.social presents: A Spatial Map of the Atmospheric Limb of a Hot Jupiter arxiv.org/abs/2610.18806 1/n🔭🧪
Artist impression of the hot Jupiter WASP-17b and its asymmetric atmosphere. The planet has a thick banded structure around the equator and the light is shining through from the back to show an extended left side of the atmosphere representing the evening terminator (limb) and a more compressed right side representing the morning terminator (limb). Artist impression of the hot Jupiter WASP-17b and its asymmetric atmosphere as it transits in front of its host star. The planet has a thick banded structure around the equator and the light is shining through from the back to show an extended left side of the atmosphere representing the evening terminator (limb) and a more compressed right side representing the morning terminator (limb).
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Denis Sergeev @meteodenny.bsky.social · 06/10/2026
but at the moment, I think that my PhD student's work on convection is super cool!
3D visualisation of convective plumes and clouds in the Met Office's atmospheric model. Simulation credit: A. Corbett.
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Denis Sergeev @meteodenny.bsky.social · 06/10/2026
that's in the eye of the beholder!
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Denis Sergeev @meteodenny.bsky.social · 06/10/2026
Check out the work by the Exoclimatology Theory Group (exoclimatology.com) - we use the Met Office's numerical models to study all sorts of cool processes in exoplanetary atmospheres
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Reposted by Denis Sergeev
Leverhulme Trust @leverhulme.ac.uk · 05/10/2026
Read about Hannah Wakeford's project which measures exoplanet atmospheres, aiming to better understand how their clouds impact the nature of the planet’s climate. media.leverhulme.ac.uk/feature/hwak... @bristoluni.bsky.social
media.leverhulme.ac.uk
The curious case of clouds and climate
Using state-of-the-art telescopes, Hannah Wakeford measures exoplanet atmospheres, aiming to better understand how their clouds impact the nature of the planet’s climate
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Planetary Research Blog @blog.planetary-research.org · 05/10/2026
How long could volcanic plumes persist in the Venus atmosphere? Detecting active volcanoes on Venus is a long-standing goal in planetary research. Venus is covered in sulfuric acid... blog.planetary-research.org/2026/10…
blog.planetary-research.org
How long could volcanic plumes persist in the Venus atmosphere?
Detecting active volcanoes on Venus is a long-standing goal in planetary research. Venus is covered in sulfuric acid clouds and lava plains which probably originate from volcanic activity, but how many eruptions the planet experiences is unknown. Observing eruptions could help us discover the interior composition of the planet, determine its level of geologic activity,...
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Duncan Christie @astroduncan.bsky.social · 23/09/2026
Potassium and sodium are significant sources of electrons in hot Jupiter atmospheres, and thus they play an important role in the atmospheric coupling to the magnetic field, among other things. I have a paper out that looks that their thermochemical kinetics. #exoplanets arxiv.org/abs/2609.26432
arxiv.org
Transport and Thermochemical Kinetics of Alkali Species in Hot Jupiter Atmospheres: Implications for Magnetic Models
Interactions between the planetary magnetic field of a hot Jupiter and the winds within its atmosphere are moderated by the electron and ion abundances. For a solar metallicity atmosphere at pressures...
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Reposted by Denis Sergeev
Met Office - weather and climate @metoffice.gov.uk · 16/09/2026
Weather and climate models are evolving, so are the skills needed to use them The new LFRic Atmosphere Training course supports the modelling community by building the skills, confidence and shared expertise needed for next-generation weather and climate models. 🔗 More in our blog bit.ly/3T6N5AQ
bit.ly
Learning LFRic: a new modelling system for weather prediction and climate projections
LFRic advances weather and climate modelling through supercomputing innovation, collaboration, and next-generation training programs.
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BOWIE+ Seminar Series @bowieseminar.bsky.social · 16/09/2026
If you want to read more about limb asymmetries, Cathal and collaborators now have a paper on some of things he discussed in his talk accepted to ApJL and up on arXiv. #exoplanets #astronomy arxiv.org/abs/2609.16834
arxiv.org
The asymmetric limbs of HD 209458 b observed with JWST NIRCam F322W2/F444W
We present a reanalysis of JWST NIRCam F322W2/F444W transit observations of the hot Jupiter HD 209458 b to extract morning and evening transmission spectra. To determine whether asymmetries in the tra...
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Laura Kreidberg @lkreidberg.bsky.social · 04/09/2026
Happy to share two postdoc ads for positions in the APEx department at MPIA - please spread the word! - direct imaging and spectroscopy of wide-separation planets with Wolfgang Brandner aas.org/jobregister/... - forward modeling of exoplanet atmospheres with Elsie Lee aas.org/jobregister/...
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Hannah Wakeford @stellarplanet.bsky.social · 02/09/2026
This is the next step towards linking our solar system to exoplanets and a way towards the future hopeful success of the Habitable Worlds Observatory. NGRST will potentially find evidence for thousands of worlds microlensing, transits, and direct imaging 🤩🔭🧪
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Prof Jim Wild @jim-wild.bsky.social · 27/08/2026
📢 Calling U.K. astronomers and physicists📢 There is a Westminster Hall debate on “Future of science facilities and laboratories” next Tuesday (1 Sep). Contact your MP and urge them to attend. More details at: ras.ac.uk/news-and-pre...
ras.ac.uk
Astronomy cuts to be discussed at Westminster
The Royal Astronomical Society (RAS) welcomes an upcoming debate at the Houses of Parliament about cuts impacting astronomy and encourages all Fellows to contact the...
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ExoClimesVIII @exoclimesviii.bsky.social · 29/07/2026
🔈Save the date! ExoClimes VIII will take place at the Institute of Science Tokyo, from 11–16 July 2027. The conference will bring together the international community studying planetary climates, atmospheres, and habitability🌏 Stay tuned for more updates!  exoclimes.org
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Planets @ Oxford @oxoplanets.bsky.social · 20/07/2026
Congratulations to Dr Mei Ting (Martha) Mak on the publication of her paper, "Flow-Driven Limb-Asymmetry of Haze Distribution Part I: An Analytical Framework for Predicting the Size Distribution of Photochemical Hazes Across the Two Limbs of hot-Jupiters" Read it here: arxiv.org/abs/2607.14845
arxiv.org
Flow-Driven Limb-Asymmetry of Haze Distribution Part I: An Analytical Framework for Predicting the Size Distribution of Photochemical Hazes Across the Two Limbs of hot-Jupiters
Photochemical haze, a common aerosol type expected to form in the atmospheres of hot-Jupiters, can become concentrated to different extents between the morning and evening limbs depending on the balan...
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Chris Parr @chrisjparr.bsky.social · 02/07/2026
Time and again I think that THIS is the stat universities should shout, shout & shout again about. New education export data again show HE responsible for nearly three-quarters of a £37bn UK revenue source. Fund our universities! Source: explore-education-statistics.service.gov.uk/find-statist...
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Planetary Research Blog @blog.planetary-research.org · 08/06/2026
Planetary Research Jobs: A new job announcements platform for planetary science blog.planetary-research.org/2026/06…
blog.planetary-research.org
Planetary Research Jobs: A new job announcements platform for planetary science
A new job announcements platform for planetary science Planetary Research Jobs is a new online platform that centralizes job announcements in the field of planetary science. Any person can browse the website for free, and any person with an ORCID iD (which is almost everyone) can post an announcement at no cost. Job announcements can [...]
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Astronomer Royal for Scotland | Catherine Heymans @astroroyalscot.bsky.social · 29/05/2026
"Someone, somewhere, has taken the decision to defund astrophysics research in the UK, but no-one seems quite sure who that was, or why." The latest on the impact of the catastrophic funding cuts to UK astrophysics, by me, in @natastron.nature.com 👩‍🔬🧪🔭 ✒️ www.nature.com/articles/s41...
World View:  A change in UK policy jeopadizes the future of UK astrophysics - By Catherine Heymans

The latest budget proposal announced by the largest UK science funding agency threatens to severely affect UK astrophysics research. My colleagues and I are fighting back.
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Keith Smith @drkeithsmith.bsky.social · 21/05/2026
Observations of #exoplanet atmospheres usually produce a combined spectrum of the morning and evening sides. Mukherjee et al. have used JWST to separate the two for a hot jupiter. They find very different spectra: a clear warm wet evening vs a cold cloudy morning. ☄️🔭🧪 www.science.org/doi/10.1126/...
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Lucien Heurtier @lucienheurtier.bsky.social · 15/05/2026
You thought the UK was leading the quest for life on exoplanets?🌍 Well, in the absence of any action from the government or UKRI leadership, this may no longer be the case. We need to restore the UK research capability in PPAN science.🔭🧪 www.timeshighereducation.com/news/physics...
timeshighereducation.com
Physics cuts threaten UK’s science leadership role, says Nobelist
Didier Queloz urges UK funding bodies to rethink funding changes, with scientists also fearing Nottingham’s ‘first-rate’ department is under threat
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Reposted by Denis Sergeev
Ken Rice @kenrice.bsky.social · 07/05/2026
If you are part of the UK Exoplanet Research Community and would like to sign our Open Letter about the planned STFC funding cuts, the link is below. uk-exoplanet-openletter.github.io/index.html
uk-exoplanet-openletter.github.io
UK Exoplanet Research Community Open Letter
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Denis Sergeev @meteodenny.bsky.social · 05/05/2026
Great video about weather on solar system planets from @metoffice.gov.uk www.youtube.com/watch?v=uBes...
youtube.com
Where does it rain diamonds? - UK Weather - Met Office Explains
YouTube video by Met Office - UK Weather
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Minas Karamanis @minaskar.bsky.social · 30/03/2026
Hey, I wrote a thing about AI in astrophysics ergosphere.blog/posts/the-ma...
ergosphere.blog
The machines are fine. I'm worried about us.
On AI agents, grunt work, and the part of science that isn't replaceable.
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Paul Byrne @theplanetaryguy.com · 09/03/2026
The giant planets of the Solar System, by JWST.
Clockwise, from top left: Jupiter, Saturn, Neptune, and Uranus. None of the worlds is to scale, but all are imaged with JWST's near-infrared (NIRCam) instrument.
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Hannah Wakeford @stellarplanet.bsky.social · 03/03/2026
See this full thread for all the ways we are showing how bad the STFC cuts to science will be With ways you can help us get the word out and just say no to cutting a generation of science and the foundation of future projects #science🧪 #astronomy🔭
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Dan Lunt @climatesamwell.bsky.social · 26/02/2026
Recently published in Fafnir - the Nordic Journal of Science Fiction and Fantasy: "Climate Models as a Retroactive and Exploratory World-building Tool" fafnir.journal.fi/article/view... Thanks to @johnfocook.bsky.social @climatedann.bsky.social and Alex and Michael Farnsworth.
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John Kennedy @micefearboggis.bsky.social · 17/02/2026
Why do we do what we do the way we do what we do? I mean, what *is* astrophysics? diagrammonkey.wordpress.com/2026/02/17/w...
diagrammonkey.wordpress.com
Why do we do what we do the way we do what we do?
In a narrow sense, LLMs are superhuman. They operate at computerish speeds and can now churn out text in seconds or minutes, that a human would take hours to write, if they could write it all. Thus…
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Denis Sergeev @meteodenny.bsky.social · 16/02/2026
Thank you Steve!
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Denis Sergeev @meteodenny.bsky.social · 12/02/2026
@steveracemp.bsky.social as your constituent I am asking you to raise this issue in Parliament and help save physics research in the UK.
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Royal Astronomical Society @royalastrosoc.bsky.social · 12/02/2026
Are you a physics teacher in the UK? We need your help! 🧑‍🔬🧑‍🏫 We've created an open letter for teachers to sign and express their grave concern at the devastating proposed cuts to astronomy, space science and particle and nuclear physics. ✍️ 👉️ ras.ac.uk/news-and-pre... #STFC #UKRI
ras.ac.uk
Open letter on astronomy cuts from UK physics teachers
drupal-media[data-view-mode=half_page_width] { display: inline-block; width: 50%; } The Royal Astronomical Society is encouraging physics teachers in the UK to sign ...
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RAS Journals @rasjournals.bsky.social · 31/07/2025
Published in #MNRAS: "Lightning activity on a tidally locked terrestrial exoplanet in storm-resolving simulations for a range of surface pressures", Sergeev et al. This is Fig. 4: to read the paper please visit academic.oup.com/mnras/articl... @oxfordacademic.bsky.social @royalastrosoc.bsky.social
Dayside average (a) air temperature, (b) cloud ice, (c) cloud liquid water, and (d) graupel as a function of height in our M09 simulations for the surface pressure of 0.25, 0.5, 1, 2, 4, 10 bar. The figure shows that with increasing surface pressure, the lapse rate becomes larger, the cloud water content diminishes, while the graupel content does not show a clear trend. Note that because the dry atmospheric mass differs between our simulations, the increase in the mass mixing ratios with pressure in this figure appears much greater than the increase in the vertically integrated cloud content shown in Figs 1(c) and 3.
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Denis Sergeev @meteodenny.bsky.social · 30/07/2025
Fresh off the press: lightning activity in high-res simulations for TRAPPIST-1e! Just a nice little study that began as James's and Lottie's undergraduate research project. We find less lightning for higher surface pressures. It's only one model though! academic.oup.com/mnras/articl...
academic.oup.com
Lightning activity on a tidally locked terrestrial exoplanet in storm-resolving simulations for a range of surface pressures
ABSTRACT. Cloudy atmospheres produce electric discharges, including lightning. Lightning, in turn, provides sufficient energy to break down air molecules i
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s-ink Science Graphics @s-ink.org · 10/06/2025
Over 5,000 worlds we’ve seen beyond our sky, Some could host life, some just float by! 🌍🪐 Gas giants, lava lands, icy charms, The universe is full of alien farms! 👽✨ #Exoplanets! s-ink.org/known-exopla... 🔭
s-ink.org
Exoplanets
The collection of known Exoplanets represented based on their date of detection and their relative size to scale.
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Alejandro Soto @soto.space · 10/06/2025
If you are interested in supporting NASA science and exploration, and saving it from capricious budget cuts, here's one thing you can do: sign this petition being sent to Senate and House members of their respective appropriations committees. Two days left to sign! www.planetary.org/advocacy-act...
planetary.org
Advocacy Action Center
The Planetary Society is organizing a new space constituency that is educated, empowered, and loud.
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European Space Agency @esa.int · 14/05/2025
🌦️ Webb's Titan forecast: partly cloudy with occasional methane showers. A science team has combined data from the NASA/ESA/CSA James Webb Space Telescope and the Keck II telescope to see evidence of cloud convection on Saturn’s moon Titan in the northern hemisphere for the first time! 🔭 🧪
esa.int
Titan forecast: partly cloudy with a chance of methane showers
A science team has combined data from the NASA/ESA/CSA James Webb Space Telescope and the Keck II telescope to see evidence of cloud convection on Saturn’s moon Titan in the northern hemisphere for th...
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⭐ ᗰᗩᖇᛕ ᗩ. ǤᗩᖇᒪIᑕᛕ ⭐ @markgarlick.com · 01/05/2025
Some of my most recent #spaceart. NOT AI. Please repost. No new followers in ages. ☹️ #sciart #scicom #astronomy
Digital illustration of the black hole. Created in Blender and Photoshop. © Mark A. Garlick.Digital illustration of a coronal mass ejection on the Sun. Created in  Blender and Photoshop. © Mark A. Garlick.Digital illustration of the Europa Clipper spacecraft, seen with the limb of the Jovian Moon Europa behind it, and Jupiter farther in the distance. Created in Blender and Photoshop. © Mark A. Garlick.Digital illustration of the planet Mars during its Noachian period, some 4100-3700 million years ago. Olympus Mons and the Tharsis volcanoes are active but not yet at their modern sizes. The canyon Valles Marineris is just beginning to form. Created in Blender and Photoshop. © Mark A. Garlick.
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Denis Sergeev @meteodenny.bsky.social · 30/04/2025
@stephenithomson.bsky.social published a paper on this
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Randall Munroe @xkcd.com · 30/04/2025
Jupiter Core xkcd.com/3083
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Dr Jake Taylor @astrojake.bsky.social · 23/04/2025
I wrote a research note about the recent publication of the MIRI/LRS spectrum of K2-18b. The authors had claimed the detection of potential signs of life. I find the data to be consistent with a flat line 🔭🧪
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Denis Sergeev @meteodenny.bsky.social · 23/04/2025
The martians (Or maybe @themartian.bsky.social)
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Denis Sergeev @meteodenny.bsky.social · 23/04/2025
Less than a month till the deadline to apply for this PhD place!
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Sarah Hörst @planetdr.bsky.social · 17/04/2025
Sarah’s rules of looking for life with only chemical signatures: 1) the smaller the molecule(s) the more likely they can also be produced by abiotic processes 2) one molecule, if it can be produced by any abiotic process, will never be enough to definitively claim detection of life
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Dr Ryan MacDonald @distantworlds.space · 17/04/2025
𝗡𝗼, 𝗮 𝗯𝗶𝗼𝘀𝗶𝗴𝗻𝗮𝘁𝘂𝗿𝗲 𝘄𝗮𝘀 𝗻𝗼𝘁 𝗷𝘂𝘀𝘁 𝗱𝗲𝘁𝗲𝗰𝘁𝗲𝗱 𝗶𝗻 𝗞𝟮-𝟭𝟴𝗯'𝘀 𝗮𝘁𝗺𝗼𝘀𝗽𝗵𝗲𝗿𝗲. K2-18b is back in the news, now with a bold claim that biosignature molecules (DMS and/or DMDS) have been 'detected at 3σ'. Most exoplanet astronomers are extremely sceptical about these claims, let's see why (1/n). 🔭🧪🪐 #exoplanet
Artist's impression of the exoplanet K2-18b.
Credit: A. Smith, University of Cambridge.
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Dr Stephen Thomson @stephenithomson.bsky.social · 27/03/2025
We're advertising 2 fully-funded PhD positions in atmospheric science @exeter.ac.uk for entry in September 2025. Both are open to UK and international appliants. The first project is with me looking at Atmospheric heat transport across a range of planetary climates www.exeter.ac.uk/study/fundin...
exeter.ac.uk
Award details | Funding and scholarships for students | University of Exeter
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Denis Sergeev @meteodenny.bsky.social · 26/03/2025
Exciting PhD opportunity at @exeter.ac.uk: Forecasting Martian Dust Storms (funded by @ukspaceagency.bsky.social)! Please share widely! More details: www.exeter.ac.uk/study/fundin...
3D visualisation of dust and wind currents in the atmosphere of Mars as simulated by the UK Met Office Unified Model. Image credit: Danny McCulloch (U. Exeter).
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Duncan Christie @astroduncan.bsky.social · 07/03/2025
This account is biased towards my professional interests, so with the caveat there are a litany of reasons to protest those in power in the US, GO PROTEST. Keep protesting. Protest until there is actual change.
arstechnica.com
White House may seek to slash NASA’s science budget by 50 percent
“It would be nothing short of an extinction-level event for space science.”…
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UNITED24 @u24.gov.ua · 28/02/2025
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Jenni Barclay @volcanojenni.bsky.social · 08/02/2025
Exciting opportunity to gather, work with and model orographic 🗻💨🗻flow in the European Alps as part of the TeamX (www.teamx-programme.org ) project based at UEA vacancies.uea.ac.uk/vacancies/14...
Graphic from the TeamX website illustrating atmospheric flow, boundary layers and exchange over mountains
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Dan Lunt @climatesamwell.bsky.social · 04/02/2025
We are really pleased to announce a 3-year postdoc at Bristol to work on tuning a state-of-the-art CMIP7 model using paleoclimate data, and using the tuned model to make future climate predictions. More details available from me, or here: tinyurl.com/mvx5wmet . Closing date: 15th Feb
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Dr Ryan MacDonald @distantworlds.space · 30/01/2025
Resharing this UK Visa route for recent US university graduates (undergrad or PhD), for anyone who may need to leave the US on short notice (3 week decision time).
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