Richard Allan
@rpallanuk.bsky.social
Professor of climate science at the University of Reading: http://www.met.reading.ac.uk/~sgs02rpa/
Environmental science
55%
Geography
19%
Jump in SSTs 2023-24 from dual tropical Pacific warming centres & eastward-extended North Atlantic jet stream, boosted by a large global energy imbalance driven by rising grenhouse gases & falling aerosol that was exacerbated by preceding extended La Niña heat sequestration: doi.org/10.1038/s432...
Global #climate hazards @ukhsa.bsky.social 18th Dec 2025:
🌧️ #floods & landslides in Bolivia, Morocco, Palestine, Malaysia & Vietnam
⛈️ storms hit Brazil & USA
🔥 #wildfire affects Chile
🏭 #smog over Bosnia & Herzegovina, N India
❄️ heavy #snow covers W Canada
www.met.reading.ac.uk/~sgs02rpa/ex...
🌧️ #floods & landslides in Bolivia, Morocco, Palestine, Malaysia & Vietnam
⛈️ storms hit Brazil & USA
🔥 #wildfire affects Chile
🏭 #smog over Bosnia & Herzegovina, N India
❄️ heavy #snow covers W Canada
www.met.reading.ac.uk/~sgs02rpa/ex...
Reposted by Richard P. Allan
Fascinating to see the stark contrasts in space and time over our small but diverse country! Climate whiplash literature will certainly be assessed in the current @ipcc.bsky.social cycle
Latest @ukceh.bsky.social UK hydrological summary for November 2025 - very wet with shift from #drought to #flood concerns and consistent with an expected more variable and extreme water cycle in a warming #climate:
nrfa.ceh.ac.uk/sites/defaul...
nrfa.ceh.ac.uk/sites/defaul...
Emerging cold-fresh/warm-salty dipoles in the N Atlantic during 2014 with implications for ocean circulation - more analysis with my Dad in @tandfresearch.bsky.social! doi.org/10.1080/0705...
Animation of OSCAR estimated ocean currents just for fun ⬇️
Animation of OSCAR estimated ocean currents just for fun ⬇️
Reposted by Richard P. Allan
We gathered for a festive feed to celebrate our 39 picks by 75 volunteers working a gruelling 942 volunteer-hours to collect 563 small bags + 375 big bags of litter from across Caversham in 2025. As usual Ken wins🥇for the most picks (35)! Thanks to @dofe.org volunteers for their help #litterpickers
Global #climate hazards @ukhsa.bsky.social 12th December 2025:
🌧️ #flooding & landslides across Malaysia, Thailand, Indonesia, Vietnam, Sri Lanka, Iraq, DR Congo, USA & Brazil
🔥 #wildfire in Australia
⛈️ winter storm hits Palestine
www.met.reading.ac.uk/~sgs02rpa/ex...
🌧️ #flooding & landslides across Malaysia, Thailand, Indonesia, Vietnam, Sri Lanka, Iraq, DR Congo, USA & Brazil
🔥 #wildfire in Australia
⛈️ winter storm hits Palestine
www.met.reading.ac.uk/~sgs02rpa/ex...
Reposted by Richard P. Allan
Festive tunes have arrived @unirdg-met.bsky.social following our last weather & climate discussion!
The @uniofreading.bsky.social authors of @ipcc.bsky.social 7th assessment met in Paris with 2 @unirdg-met.bsky.social covering physical processes & climate stabilisation pathways + 1 @unirdg-law.bsky.social on #climate law aspects of mitigation:
www.ipcc.ch/assessment-r...
www.ipcc.ch/assessment-r...
Reposted by Carlos Moreno
![People moving in Water logged area [Credit: DMC Sri Lanka via WHO]](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:u6g7lrvd3rqarb36jqeekqb3/bafkreierikhmc6xpheb6qjn3fmioccfimhhawu53eil7b3rure7fvhulyu@jpeg)
Global #climate hazards @ukhsa.bsky.social 5th Dec 2025:
🌧️ #floods & landslides affect South & Southeast Asia, Bolivia, Peru & South Africa
🌩️ storms hit DR Congo & New Zealand
www.met.reading.ac.uk/~sgs02rpa/ex...
🌧️ #floods & landslides affect South & Southeast Asia, Bolivia, Peru & South Africa
🌩️ storms hit DR Congo & New Zealand
www.met.reading.ac.uk/~sgs02rpa/ex...
Global #climate hazards @ukhsa.bsky.social 28 Nov 25
🌧️ #floods & landslides Albania, Italy, South Africa, French Polynesia, Malaysia, Indonesia, Philippines, Vietnam, Mexico
⛈️ storms hit eastern Australia, Brazil, USA, Sri Lanka & India
🥀 #drought grips Somalia
www.met.reading.ac.uk/~sgs02rpa/ex...
🌧️ #floods & landslides Albania, Italy, South Africa, French Polynesia, Malaysia, Indonesia, Philippines, Vietnam, Mexico
⛈️ storms hit eastern Australia, Brazil, USA, Sri Lanka & India
🥀 #drought grips Somalia
www.met.reading.ac.uk/~sgs02rpa/ex...
Richard Allan
@rpallanuk.bsky.social
· Nov 24
Slow late November growth in #Arctic sea ice extent, 2nd only to 2016 based on @nsidc.bsky.social data:
nsidc.org/sea-ice-toda...
nsidc.org/sea-ice-toda...
Richard Allan
@rpallanuk.bsky.social
· Nov 22
Solar radiation modification could reduce global temperatures but is no substitute for reducing emissions, says Royal Society | Royal Society
A Royal Society briefing, published today, considers the potential impacts of solar radiation modification (SRM) if deployed globally, in a scientifically informed way, across both hemispheres and for...
royalsociety.org
Only through carefully coordinated international agreement and as an addition to mitigation of greenhouse gas emissions, assuming the latter was deemed inadequate: royalsociety.org/news/2025/11...
Richard Allan
@rpallanuk.bsky.social
· Nov 21
You could email the author? Couldn’t find an open access version
Richard Allan
@rpallanuk.bsky.social
· Nov 21
Global #climate hazards @ukhsa.bsky.social 21 Nov 2025:
⛈️ storms hit Chile/Argentina, Portugal & UK
🌧️ #floods & landslides affect Italy/Slovenia, France, Republic of the Congo, Thailand, Vietnam, Indonesia, USA
www.met.reading.ac.uk/~sgs02rpa/ex...
⛈️ storms hit Chile/Argentina, Portugal & UK
🌧️ #floods & landslides affect Italy/Slovenia, France, Republic of the Congo, Thailand, Vietnam, Indonesia, USA
www.met.reading.ac.uk/~sgs02rpa/ex...
Richard Allan
@rpallanuk.bsky.social
· Nov 21
Future extreme precipitation amplified by intensified mesoscale moisture convergence - Nature Geoscience
Extreme daily precipitation events over land could increase by about 41% by 2100 under a high-emissions scenario with an increase in mesoscale moisture convergence, according to an ensemble of climate...
doi.org
Daily extreme precipitation over land increases ~40% by 2100 in high resolution single model ensemble under high greenhouse gas emissions scenario with over half driven by enhanced mesoscale convergence that's underestimated by factor of 3 in low-resolution simulations:
doi.org/10.1038/s415...
doi.org/10.1038/s415...
Richard Allan
@rpallanuk.bsky.social
· Nov 21
How China cleaned up its air pollution – and what that meant for the climate
Atmospheric scientist Laura Wilcox talks to The Conversation Weekly about the measures China took to improve its air pollution – and the unintended consequences for the climate.
theconversation.com
As well as protecting health, China’s efforts at cleaning up aerosol particle pollution has restored sunlight to Pacific Ocean, once robbed by the haze that was artificially brightening clouds, which unfortunately adds to warming - @uk.theconversation.com podcast:
theconversation.com/how-china-cl...
theconversation.com/how-china-cl...
Richard Allan
@rpallanuk.bsky.social
· Nov 19
No. But at the top of our new large water tank is the computer that assesses various in/out temperatures & weather conditions to fine tune things. There’s a survey before install to assess heat loss from each room so they know if to install bigger radiators and they’d answer these kinds of questions
Richard Allan
@rpallanuk.bsky.social
· Nov 19
Not noticed any issues? Our air to water heat pump is designed to work effectively and without issue down to -10C snd below and has inbuilt frost settings so shouldn’t be an issue in the UK, though regularly checking for debris or snow build up is also recommended.
Richard Allan
@rpallanuk.bsky.social
· Nov 19
The fast-fix for global warming that the UN climate summit can’t ignore
Removing so-called ‘short-lived climate pollutants’ from the atmosphere could reduce global warming – fast.
theconversation.com
As well as rapidly cutting CO2 emissions, tackling short-lived warming agents like methane & surface ozone pollution boosts action to limit #climate warming + counteracts warming from cleaning our air of harmful aerosol particles that have robbed us of sunlight: theconversation.com/the-fast-fix...
Richard Allan
@rpallanuk.bsky.social
· Nov 19
Our heat pump doing it’s job taking in cold air, extracting energy to heat our house and exhaling even colder air that has kept the dusting of snow happy in its artificial frost hollow long after it had melted away elsewhere!
Richard Allan
@rpallanuk.bsky.social
· Nov 17
October 2025 quite dry in UK apart from N Ireland/west Scotland/Kent with below average river flows in east & depleted groundwater/reservoirs but wetter soils with low groundwater-fed river flows expected to continue despite early November deluges - @ceh.org summary:
nrfa.ceh.ac.uk/sites/defaul...
nrfa.ceh.ac.uk/sites/defaul...
Richard Allan
@rpallanuk.bsky.social
· Nov 14
Global #climate hazards @ukhsa.bsky.social 14 Nov 2025:
🌀 tropical cyclones affect Philippines, Taiwan, Japan
⛈️ storms hit Brazil, Portugal, Spain, Burundi
🌧️ landslides #floods DR Congo, Pakistan, Thailand, Indonesia
🏭 smog Delhi/India
🥀 #drought Iran, Somalia
www.met.reading.ac.uk/~sgs02rpa/ex...
🌀 tropical cyclones affect Philippines, Taiwan, Japan
⛈️ storms hit Brazil, Portugal, Spain, Burundi
🌧️ landslides #floods DR Congo, Pakistan, Thailand, Indonesia
🏭 smog Delhi/India
🥀 #drought Iran, Somalia
www.met.reading.ac.uk/~sgs02rpa/ex...
Richard Allan
@rpallanuk.bsky.social
· Nov 13
New assessment reported @nature.com finds weaker land carbon sink but stronger ocean sink than previously thought with #climate change and deforestation stifling how much carbon the continents can take up, leaving more behind to raise atmospheric CO2 levels:
doi.org/10.1038/s415...
doi.org/10.1038/s415...
Reposted by Richard P. Allan
In glorious Autumn sunshine we cleared Amersham Rd & southern offshoots, collecting 8 large/14 small bags of litter, finding wrappers so old they could be archaeological! See future rubbish events on the rubbish website:
www.met.reading.ac.uk/~sgs02rpa/KCT/
www.met.reading.ac.uk/~sgs02rpa/KCT/
Richard Allan
@rpallanuk.bsky.social
· Nov 7
Global #climate hazards @ukhsa.bsky.social 7th Nov 25:
🌀 Tropical Cyclones affect Caribbean and South East Asia
🌧️ Landslides & floods hit Uganda/Kenya
⛈️ Storms strike Brazil
⚪ Giant Hail in northeast Australia
🏔️ Avalanches in Italy & Nepal
www.met.reading.ac.uk/~sgs02rpa/ex...
🌀 Tropical Cyclones affect Caribbean and South East Asia
🌧️ Landslides & floods hit Uganda/Kenya
⛈️ Storms strike Brazil
⚪ Giant Hail in northeast Australia
🏔️ Avalanches in Italy & Nepal
www.met.reading.ac.uk/~sgs02rpa/ex...
Richard Allan
@rpallanuk.bsky.social
· Nov 6
New @royalsociety.org report assesses geoengineering #climate to mask human caused warming by artificially injecting aerosol haze to reflect sunlight, arguing it can only be used as a well coordinated compliment to deficient mitigation of greenhouse gas emissions:
royalsociety.org/news-resourc...
royalsociety.org/news-resourc...
Richard Allan
@rpallanuk.bsky.social
· Nov 4
Aviation passenger carbon footprint calculator with comprehensive emissions, life cycle coverage, and historical adjustment - Communications Earth & Environment
A new aviation carbon footprint tool improves accuracy and transparency by incorporating nitrogen oxide, water vapor, and contrail impacts, life cycle emissions from aircraft and airports, and adjusti...
www.nature.com
You could take a look at the underlying research article I shared & references within: www.nature.com/articles/s43...
Contrails, NOx + water vapour all trap outgoing longwave radiation for example, though the precise calculation depends on time scale since CO2 stays in the atmosphere much longer
Contrails, NOx + water vapour all trap outgoing longwave radiation for example, though the precise calculation depends on time scale since CO2 stays in the atmosphere much longer
Reposted by Richard P. Allan
When the Lakes Remember: Unravelling the Sudd Floods of 2022
By Douglas Mulangwa – d.mulangwa@pgr.reading.ac.uk Between 2019 and 2024, East Africa experienced one of the most persistent high-water periods in modern history: a flood that simply would no…
socialmetwork.blog
New insights into slow progression of #flooding from Lakes Victoria, Kyoga & Albert + expansion of Sudd Wetlands in East Africa 2019-2024 enable better forecasting – new blog by Douglas Mulangwa: socialmetwork.blog/2025/10/28/w...