Matthew Henry
@mattjohenry.bsky.social
Climate science PhD | Aerosols, SRM | Senior Research Fellow | University of Exeter | Based in Leeds | 🇬🇧/🇫🇷
https://matthewjhenry.github.io/
https://matthewjhenry.github.io/
Using 2 figures from articles cited by Siegert et al, we challenge 2 of their statements on the effect of stratospheric aerosol injection (SAI) on the Arctic: 1/ that SAI is ineffective in the polar winter and 2/ that polar injection locations would be needed to produce an impact in polar regions.
November 14, 2025 at 10:34 AM
Using 2 figures from articles cited by Siegert et al, we challenge 2 of their statements on the effect of stratospheric aerosol injection (SAI) on the Arctic: 1/ that SAI is ineffective in the polar winter and 2/ that polar injection locations would be needed to produce an impact in polar regions.
Stormy weather = cleaner grid!
October 3, 2025 at 2:59 PM
Stormy weather = cleaner grid!
Our 20th 🥳 set of SRM talks is on the 26th September!
Check out sites.google.com/view/solarge... for recordings of previous talks and link to sign up to the mailing list.
Check out sites.google.com/view/solarge... for recordings of previous talks and link to sign up to the mailing list.
September 18, 2025 at 2:41 PM
Our 20th 🥳 set of SRM talks is on the 26th September!
Check out sites.google.com/view/solarge... for recordings of previous talks and link to sign up to the mailing list.
Check out sites.google.com/view/solarge... for recordings of previous talks and link to sign up to the mailing list.
Il y a quand même pas mal d'informations trompeuses dans l'étude. Juste pour prendre un exemple : oui, il n'y a pas de soleil en hiver dans les poles, mais le SAI refroidit quand meme les poles en hiver (voir b ci-dessous tiré d'un papier cité dans l'étude (Lee et al. 2023)).
September 11, 2025 at 5:26 PM
Il y a quand même pas mal d'informations trompeuses dans l'étude. Juste pour prendre un exemple : oui, il n'y a pas de soleil en hiver dans les poles, mais le SAI refroidit quand meme les poles en hiver (voir b ci-dessous tiré d'un papier cité dans l'étude (Lee et al. 2023)).
Too stupid to cause a heatwave...
August 28, 2025 at 6:50 PM
Too stupid to cause a heatwave...
The content is good, but this is such a Daily Mail headline! 😅
July 22, 2025 at 7:47 AM
The content is good, but this is such a Daily Mail headline! 😅
Nope, not sure how deep I want to go down this rabbit hole!:) I know Yorkshire Water are making their reservoir data somewhat open source. www.yorkshirewater.com/about-us/wha...
July 9, 2025 at 7:36 PM
Nope, not sure how deep I want to go down this rabbit hole!:) I know Yorkshire Water are making their reservoir data somewhat open source. www.yorkshirewater.com/about-us/wha...
Huh, that's odd, 2022 looks fine(?), at least using this metric. Of course evaporation (hence temperature) should have a role to play I imagine. [Again, not an expert!:)]
But you're right about the mega-drought. It seems like a mildly dry winter followed by a mildly dry summer would be pretty bad.
But you're right about the mega-drought. It seems like a mildly dry winter followed by a mildly dry summer would be pretty bad.
July 9, 2025 at 7:27 PM
Huh, that's odd, 2022 looks fine(?), at least using this metric. Of course evaporation (hence temperature) should have a role to play I imagine. [Again, not an expert!:)]
But you're right about the mega-drought. It seems like a mildly dry winter followed by a mildly dry summer would be pretty bad.
But you're right about the mega-drought. It seems like a mildly dry winter followed by a mildly dry summer would be pretty bad.
A hose pipe ban has been declared in Leeds from 11th July. I tried to find the last time one was declared and I found one in 1995 (and almost one in 2018). Plotted below is the 3-month sum of rainfall in Bradford (closest weather station), showing minima (or near-minima) for 1995, 2018, and 2025.
July 9, 2025 at 3:39 PM
A hose pipe ban has been declared in Leeds from 11th July. I tried to find the last time one was declared and I found one in 1995 (and almost one in 2018). Plotted below is the 3-month sum of rainfall in Bradford (closest weather station), showing minima (or near-minima) for 1995, 2018, and 2025.
Yes, maybe the reservoir levels are better related to the sum of rainfall over the preceding few months, which is what is shown here. 2025 clearly stands out.
July 6, 2025 at 3:22 PM
Yes, maybe the reservoir levels are better related to the sum of rainfall over the preceding few months, which is what is shown here. 2025 clearly stands out.
Had a play with Met Office station data from Bradford (closest I could find), it does look persistently low for the last few months (though 2025 is provisional, and some of the data is estimated etc).
July 6, 2025 at 1:03 PM
Had a play with Met Office station data from Bradford (closest I could find), it does look persistently low for the last few months (though 2025 is provisional, and some of the data is estimated etc).
Please consider submitting an abstract to the session on SRM and GeoMIP!
Deadline 13th August!
Deadline 13th August!
May 29, 2025 at 4:24 PM
Please consider submitting an abstract to the session on SRM and GeoMIP!
Deadline 13th August!
Deadline 13th August!
No, the warming rate is ~0.3C/decade. There is a difference between 1 year exceeding 2C (which is what FT is discussing) and the 20-year average (which we use to define the '1.5C' and '2C' thresholds).
Still shocking though!
Still shocking though!
May 28, 2025 at 2:10 PM
No, the warming rate is ~0.3C/decade. There is a difference between 1 year exceeding 2C (which is what FT is discussing) and the 20-year average (which we use to define the '1.5C' and '2C' thresholds).
Still shocking though!
Still shocking though!
Next SRM talks are up!
Go to sites.google.com/view/solarge... to register for the mailing list and see the previous recorded talks.
Go to sites.google.com/view/solarge... to register for the mailing list and see the previous recorded talks.
May 23, 2025 at 8:57 AM
Next SRM talks are up!
Go to sites.google.com/view/solarge... to register for the mailing list and see the previous recorded talks.
Go to sites.google.com/view/solarge... to register for the mailing list and see the previous recorded talks.
GFDL is the GOAT, protect it at all costs. Eliminating it would be such pure utter madness...
April 24, 2025 at 7:05 PM
GFDL is the GOAT, protect it at all costs. Eliminating it would be such pure utter madness...
Next SRM talks will be next week!
Check out the website (sites.google.com/view/solarge...) for mail list registration and recording of previous talks.
Check out the website (sites.google.com/view/solarge...) for mail list registration and recording of previous talks.
April 11, 2025 at 4:22 PM
Next SRM talks will be next week!
Check out the website (sites.google.com/view/solarge...) for mail list registration and recording of previous talks.
Check out the website (sites.google.com/view/solarge...) for mail list registration and recording of previous talks.
A strong call for defunding climate intervention science research in the Guardian today!
www.theguardian.com/commentisfre...
www.theguardian.com/commentisfre...
March 12, 2025 at 12:55 PM
A strong call for defunding climate intervention science research in the Guardian today!
www.theguardian.com/commentisfre...
www.theguardian.com/commentisfre...
Next set of climate intervention talks are up. Check out the website to sign up to the mailing list and watch recordings of previous talks.
sites.google.com/view/solarge...
sites.google.com/view/solarge...
March 6, 2025 at 9:47 AM
Next set of climate intervention talks are up. Check out the website to sign up to the mailing list and watch recordings of previous talks.
sites.google.com/view/solarge...
sites.google.com/view/solarge...
March 5, 2025 at 9:18 AM
There are 4 3-year postdocs open in our group at the University of Exeter on SRM. It's a fascinating topic and a great place to work! Do reach out if you want to chat about it.
Search for 'R99120' in key words here jobs.exeter.ac.uk/hrpr_webrecr...
(I can't seem to link directly to the ad...)
Search for 'R99120' in key words here jobs.exeter.ac.uk/hrpr_webrecr...
(I can't seem to link directly to the ad...)
February 14, 2025 at 6:07 PM
There are 4 3-year postdocs open in our group at the University of Exeter on SRM. It's a fascinating topic and a great place to work! Do reach out if you want to chat about it.
Search for 'R99120' in key words here jobs.exeter.ac.uk/hrpr_webrecr...
(I can't seem to link directly to the ad...)
Search for 'R99120' in key words here jobs.exeter.ac.uk/hrpr_webrecr...
(I can't seem to link directly to the ad...)
I used the monthly ONI index here www.cpc.ncep.noaa.gov/data/indices...
But yeah the forecast looks like 2025 as whole might be neutral (www.cpc.ncep.noaa.gov/products/ana...)
But yeah the forecast looks like 2025 as whole might be neutral (www.cpc.ncep.noaa.gov/products/ana...)
February 8, 2025 at 3:08 PM
I used the monthly ONI index here www.cpc.ncep.noaa.gov/data/indices...
But yeah the forecast looks like 2025 as whole might be neutral (www.cpc.ncep.noaa.gov/products/ana...)
But yeah the forecast looks like 2025 as whole might be neutral (www.cpc.ncep.noaa.gov/products/ana...)