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John Kennedy

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H-index: 18
Environmental science 43%
Geography 15%
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Reposted by: John Kennedy

ruthmottram.bsky.social
🚨 New @oceaniceeu.bsky.social preprint🚨 why has Antarctica stopped (net) losing mass, in spite of increased discharge?
Declining sea ice is part of the answer but increasingly heavy and frequent atmospheric rivers are most important factor.

Lots of important subtleties:
arxiv.org/abs/2510.03590
Screenshot of figures from the paper: Above a graph showing wiggly lines depicting the cumulative mass budget of Antarctica: a dark line swoops and wiggles downwards before stabilising at the end, colourful dashed lines (depicting snow fall) wiggle along constantly before sloping upwards at the same tme stabilisation occurs. Below 6 maps of Antarctica in blues and red depicting the mass change in different basins.
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by John Kennedy — Reposted by: John Kennedy

micefearboggis.bsky.social
Open Ocean #10

In which I attempt maths and experience regret. But at least my mean ends up in about the right place.

diagrammonkey.wordpress.com/2025/10/06/o...
Open Ocean #10
In which I attempt maths and experience regret.
diagrammonkey.wordpress.com
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Reposted by: John Kennedy, Dorothy Bishop, Ben Bond‐Lamberty

vargaslab.bsky.social
⭐️Nominate an Impactful Dataset

@agu.org invites you to nominate an impactful dataset!

📊Submissions will be considered for inclusion in an upcoming featured commentary published in AGU Advances.

Submit nominations by 20 October.

docs.google.com/forms/d/e/1F...

@agubiogeosciences.bsky.social
Nominate an Impactful Dataset
You are invited to nominate a dataset to be included in a commentary about the impact of Earth, space, and environmental data using the dimensions of people, planet, and prosperity. Selected submitter...
docs.google.com
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by John Kennedy — Reposted by: John Kennedy

micefearboggis.bsky.social
Open Ocean #9

Lots of little things

diagrammonkey.wordpress.com/2025/10/05/o...
Open Ocean #9
Lots of little things
diagrammonkey.wordpress.com
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by John Kennedy

micefearboggis.bsky.social
I was supposed to drop the map of anomalies into this thread... It's quite warm in lots of places but there are some large anomalies over the NH.

bsky.app/profile/mice...
micefearboggis.bsky.social
John Kennedy @micefearboggis.bsky.social · 2d
The anomalies locally look like this...

(from pulse.climate.copernicus.eu)
Map of surface air temperature anomales from ERA5 for September 2025. Red areas are warmer than the 1991-2020 average and blue areas are colder than it. There are four different logos along the bottom of the graph and one of them appears twice.
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by John Kennedy

micefearboggis.bsky.social
The anomalies locally look like this...

(from pulse.climate.copernicus.eu)
Map of surface air temperature anomales from ERA5 for September 2025. Red areas are warmer than the 1991-2020 average and blue areas are colder than it. There are four different logos along the bottom of the graph and one of them appears twice.
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by John Kennedy

micefearboggis.bsky.social
You can see the September bounce here too in a plot of all monthly averages. It will be interesting to see the final ERA5 figures.
Graph showing monthly global mean temperature from 2014 to September 2025. Seven datasets are shown: HadCRUT5, NOAAGlobalTemp v6, GISTEMP, two flavours of Berkeley Earth, JRA-3Q and ERA5.
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by John Kennedy — Reposted by: John Kennedy

micefearboggis.bsky.social
September global mean temperature is going to take a big leap from August it looks like. I looked at the mean of the daily averages from ERA5 and on an anomaly basis it's much warmer than August was and way above anything before the huge 2023 lurch.
Graph showing global mean temperature for Septembers from 1850 to 2025. Seven datasets are shown: HadCRUT5, NOAAGlobalTemp v6, GISTEMP, two flavours of Berkeley Earth, JRA-3Q and ERA5.
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by John Kennedy — Reposted by: John Kennedy

micefearboggis.bsky.social
Open Ocean #8

Extending the SST data further back in time and the wonderful horrors of ICOADS.

diagrammonkey.wordpress.com/2025/10/01/o...
Open Ocean #8
Extending the SST data further back in time and the wonderful horrors of ICOADS.
diagrammonkey.wordpress.com
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by John Kennedy — Reposted by: John Kennedy, Peter Thorne

micefearboggis.bsky.social
Open Ocean #7

Using a simple interpolation scheme to estimate biases in the ship data and create a bias adjusted dataset.

diagrammonkey.wordpress.com/2025/09/30/o...
Open Ocean #7
Using a simple interpolation scheme to estimate biases in the ship data and create a bias adjusted dataset
diagrammonkey.wordpress.com
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by John Kennedy

micefearboggis.bsky.social
Invincibly ignorant is a thing.

by John Kennedy — Reposted by: John Kennedy

micefearboggis.bsky.social
Open Ocean #6

Implementing a pattern-based reconstruction technique that works by – I swear – pure magic.

diagrammonkey.wordpress.com/2025/09/28/o...
Open Ocean #6
Implementing a pattern-based reconstruction technique that works by – I swear – pure magic.
diagrammonkey.wordpress.com
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by John Kennedy — Reposted by: Peter Jacobs

micefearboggis.bsky.social
Open Ocean #5

Interpolating anomalies in the simple gridder to produce globally complete fields.

diagrammonkey.wordpress.com/2025/09/27/o...
Open Ocean #5
Interpolating anomalies in the simple gridder to produce globally complete fields.
diagrammonkey.wordpress.com
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by John Kennedy — Reposted by: John Kennedy

micefearboggis.bsky.social
Open Ocean #4

In which I estimate sampling uncertainties for my simple gridder.

diagrammonkey.wordpress.com/2025/09/26/o...
Open Ocean #4
In which I estimate sampling uncertainties for my simple gridder.
diagrammonkey.wordpress.com
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by John Kennedy

micefearboggis.bsky.social
That’s *the* cropolis.
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by John Kennedy

micefearboggis.bsky.social
There's another fault line: people who really look at their data and people who don't.
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by John Kennedy — Reposted by: John Kennedy

micefearboggis.bsky.social
Open Ocean #3

Estimating ship-buoy biases with a simple gridder.

diagrammonkey.wordpress.com/2025/09/24/o...
Open Ocean #3
Last time, I did some comparisons between HadSST4 (unadjusted data) and the output from the simple gridder. They were pretty close to each other. I ended up by showing that the number of occupied g…
diagrammonkey.wordpress.com
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by John Kennedy

micefearboggis.bsky.social
Yes, it is bad teaching. The "right" way, you propose, postpones the punchline but it is admirably chaotic.

by John Kennedy

micefearboggis.bsky.social
Thanks! That's nice to hear.

At the risk of saying something I will come to regret, the world needs more blogging scientists.
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by John Kennedy

micefearboggis.bsky.social
That is exactly how I used git for years.
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by John Kennedy

micefearboggis.bsky.social
You don't use git? Oh wow. OK. It's really cool. What's that? You heard it's kind of difficult. Nah, it's really simple. How does it work? Well, you just need to know a little graph theor... Hey! Where are you going?
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by John Kennedy

micefearboggis.bsky.social
Gah. These days I'm only interested in solving climate problems with a comically large mallet.
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Reposted by: John Kennedy, Peter Thorne, Ed Hawkins

dougmcneall.bsky.social
Come and join us developing AI for solving climate problems. careers.metoffice.gov.uk/join-us/sear...
Met Office Careers
careers.metoffice.gov.uk
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by John Kennedy

micefearboggis.bsky.social
More steps

diagrammonkey.wordpress.com/2025/09/23/o...
Open Ocean #2
Yesterday1, I posted the results from a very basic gridder. Today, I’ve been processing some more data, tidying up the code a bit, looking at the output and doing some initial comparisons. Th…
diagrammonkey.wordpress.com
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by John Kennedy

micefearboggis.bsky.social
It depends what you mean by non-ML AI I guess.

Neural nets have been used for interpolation of global temperature datasets.
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by John Kennedy

micefearboggis.bsky.social
It might turn out to be how we finally digitise the majority of paper records

brohan.org/AI_daily_pre...
AI Data Rescue: Daily Precipitation — AI data rescue: Daily precipitation
brohan.org
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Reposted by: John Kennedy

timosbornclim.bsky.social
For regular monthly updates to CRUTEM (and hence to HadCRUT) we rely on monthly data provided by National Met Services via the WMO's CLIMAT system. Unusually, the USA data didn't yet make it into the CLIMAT data feed for Mar-Jun 2025. Note the USA-sized gap in the non-infilled version of HadCRUT:
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Reposted by: John Kennedy, Peter Thorne, John K. Pinnegar , and 3 more

timosbornclim.bsky.social
After a brief (ahem) hiatus, the HadCRUT5 global temperature dataset has now been updated to June 2025 by @metoffice.gov.uk @climateuea.bsky.social and @ncas-uk.bsky.social
1850-2025 time series of global mean temperature anomaly from the HadCRUT5 dataset.
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by John Kennedy

micefearboggis.bsky.social
There's no data on the IQUAM website after May 2024. There is a note on the website that says

"As of 31 May 2025, iQuam data is not being monitored by SST team members."
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by John Kennedy — Reposted by: John Kennedy

micefearboggis.bsky.social
Open Ocean

In which I go through the steps of writing a simple gridder for in situ sea surface temperature data.

diagrammonkey.wordpress.com/2025/09/21/o...
Open Ocean
In which I go through the steps of writing a simple gridder for in situ sea surface temperature data.
diagrammonkey.wordpress.com
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References

Fields & subjects

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