Tas van Ommen
@tasvo.bsky.social
Climate scientist specialising in ice cores, Antarctica and glaciology. Interested in science and how we use it to navigate our place in the universe. Adjunct Professor at U. Tasmania.
Always cool to see this image, given my (very old) PhD in radioastronomy which included a run of single pulses from a wildly variable pulsar (1451-68). Don’t think the PM really knows what he’s wearing.
October 25, 2025 at 7:21 AM
Always cool to see this image, given my (very old) PhD in radioastronomy which included a run of single pulses from a wildly variable pulsar (1451-68). Don’t think the PM really knows what he’s wearing.
Late to the rebuttal
October 3, 2025 at 9:24 PM
Late to the rebuttal
Some are saying we shouldn’t commit to net zero “at any price”. Fair enough then, what is the price? The NCRA sets out some fairly serious costs for adaptation and is clear that these are less than the costs of inaction. It also is frank in its view that it is likely UNDER-estimating the costs.
September 16, 2025 at 8:41 AM
Some are saying we shouldn’t commit to net zero “at any price”. Fair enough then, what is the price? The NCRA sets out some fairly serious costs for adaptation and is clear that these are less than the costs of inaction. It also is frank in its view that it is likely UNDER-estimating the costs.
September 6, 2025 at 9:04 AM
Welcome, and here’s a cat who makes a splendid Bluesky scrolling companion.
September 2, 2025 at 9:28 PM
Welcome, and here’s a cat who makes a splendid Bluesky scrolling companion.
Derwent River fog and clouds make for a winter Hobart treat.
July 6, 2025 at 12:21 AM
Derwent River fog and clouds make for a winter Hobart treat.
Scroll past me at your peril.
April 10, 2025 at 8:31 AM
Scroll past me at your peril.
Looks like it has a lot of science writing too. 18 of mine. At least it might have learned a thing or two about climate science!🧐
March 21, 2025 at 5:50 AM
Looks like it has a lot of science writing too. 18 of mine. At least it might have learned a thing or two about climate science!🧐
Here’s Sandy to say hello to Bluesky contacts!
March 15, 2025 at 9:14 AM
Here’s Sandy to say hello to Bluesky contacts!
And in iOS you can set Keyboard/Text replacement so you always get CO₂ etc…
March 1, 2025 at 11:07 PM
And in iOS you can set Keyboard/Text replacement so you always get CO₂ etc…
Once you’ve read this there’s no appetite for it anyway. australianauthors.com.au/wp-content/w...
February 18, 2025 at 5:57 AM
Once you’ve read this there’s no appetite for it anyway. australianauthors.com.au/wp-content/w...
That’s modern. Recall this one on calls home at uni.
January 7, 2025 at 6:50 AM
That’s modern. Recall this one on calls home at uni.
Lazy last days of 2024!
December 26, 2024 at 10:34 PM
Lazy last days of 2024!
Update time. Status - settled.
December 11, 2024 at 8:48 AM
Update time. Status - settled.
For new followers, welcome - here is a taste of what I like to post. This little animation draws on the ice core record of temperature and CO2 over the last 800,000 years. It shows clearly the tight coupling between the two, and the alarming anthropogenic CO2 increase! 🧪
November 23, 2024 at 8:53 AM
For new followers, welcome - here is a taste of what I like to post. This little animation draws on the ice core record of temperature and CO2 over the last 800,000 years. It shows clearly the tight coupling between the two, and the alarming anthropogenic CO2 increase! 🧪
As an aside to normal posts, here is the new member of the household - 8 yo rescue, surrendered as feral but still seems to like humans! Meet Sandy. Pronouns she, her.
November 19, 2024 at 6:48 AM
As an aside to normal posts, here is the new member of the household - 8 yo rescue, surrendered as feral but still seems to like humans! Meet Sandy. Pronouns she, her.
Also in the Derwent this morning, generating a bit less wake. Felt like summer.
November 17, 2024 at 7:41 AM
Also in the Derwent this morning, generating a bit less wake. Felt like summer.
A nice, straight forward approach! While I doubt that the planet cares whether our arbitrary Paris 1.5° is above pre-1700 or 1850-1900, it’s a clear trend and a perturbation that is good to be able to quantify. And great to see the Law Dome CO₂ record continuing to deliver!
November 12, 2024 at 6:38 AM
A nice, straight forward approach! While I doubt that the planet cares whether our arbitrary Paris 1.5° is above pre-1700 or 1850-1900, it’s a clear trend and a perturbation that is good to be able to quantify. And great to see the Law Dome CO₂ record continuing to deliver!
Hey Bluesky - intruder alert!
November 13, 2023 at 7:59 AM
Hey Bluesky - intruder alert!
From Antarctica.gov.au : ❄🌊A new Antarctic ice shelf-ocean model is making a splash, challenging conventional ideas about ice shelf melting. The model will provide more accurate projections of future sea level rise.
antarctica.gov.au/news/2023/new-…
X: @AusAntarctic @NCInews @ANUmedia @IMASUTAS
antarctica.gov.au/news/2023/new-…
X: @AusAntarctic @NCInews @ANUmedia @IMASUTAS
November 7, 2023 at 10:03 PM
From Antarctica.gov.au : ❄🌊A new Antarctic ice shelf-ocean model is making a splash, challenging conventional ideas about ice shelf melting. The model will provide more accurate projections of future sea level rise.
antarctica.gov.au/news/2023/new-…
X: @AusAntarctic @NCInews @ANUmedia @IMASUTAS
antarctica.gov.au/news/2023/new-…
X: @AusAntarctic @NCInews @ANUmedia @IMASUTAS
Credit to Gavin Foster for a great
Xweet. To which I say “This is a very interesting early intersection of climate and human history - human existence and climate are entwined and we need to understand the earth system.”
www.science.org/doi/abs/10.1...
Xweet. To which I say “This is a very interesting early intersection of climate and human history - human existence and climate are entwined and we need to understand the earth system.”
www.science.org/doi/abs/10.1...
September 1, 2023 at 9:02 AM
Credit to Gavin Foster for a great
Xweet. To which I say “This is a very interesting early intersection of climate and human history - human existence and climate are entwined and we need to understand the earth system.”
www.science.org/doi/abs/10.1...
Xweet. To which I say “This is a very interesting early intersection of climate and human history - human existence and climate are entwined and we need to understand the earth system.”
www.science.org/doi/abs/10.1...
Climate change is impacting Antarctica.
The conclusions of climate science are restrained by the unknowns in each changing domain, sea ice is the latest dramatic example, BUT consistent changes across multiple areas speak to the overarching picture - a point made a decade ago.
The conclusions of climate science are restrained by the unknowns in each changing domain, sea ice is the latest dramatic example, BUT consistent changes across multiple areas speak to the overarching picture - a point made a decade ago.
August 4, 2023 at 9:31 AM
Climate change is impacting Antarctica.
The conclusions of climate science are restrained by the unknowns in each changing domain, sea ice is the latest dramatic example, BUT consistent changes across multiple areas speak to the overarching picture - a point made a decade ago.
The conclusions of climate science are restrained by the unknowns in each changing domain, sea ice is the latest dramatic example, BUT consistent changes across multiple areas speak to the overarching picture - a point made a decade ago.
For a first post, celebrating the role of climate science with some bubbles - not champagne but a slice of ice from Antarctica’s depths.
July 25, 2023 at 5:44 AM
For a first post, celebrating the role of climate science with some bubbles - not champagne but a slice of ice from Antarctica’s depths.