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Dr. Evan J. Gowan

@evangowan.bsky.social

1.3k Following3k Followers

I am a climate scientist, focused on paleoclimate, sea level change and the evolution of Quaternary glaciations. I reconstruct ice sheets using glacial isostatic adjustment and ice sheet modelling. In Japan but have been all over the place. πŸ‡¨πŸ‡¦πŸ‡―πŸ‡΅πŸ‡¦πŸ‡ΊπŸ‡©πŸ‡ͺπŸ‡ΈπŸ‡ͺ

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@evangowan.bsky.socialOct 12, 2026, 4:54 AM

This dung pile is a con to try and justify the insane trillion dollar valuation of OpenAI before it goes public. I assume that most of these papers will be full of nonsense, but as the article notes, it takes a long time for mathematicians to verify claims.

@oceanhelen.bsky.socialOct 9, 2026, 9:54 AMReposted by @evangowan.bsky.social

Great to see this paper finally out. Patiently Led by Prof Zanna Chase as part of c-side PAGES working group on past changes and the role of sea ice in the earth system. 🌊🧊
cp.copernicus.org/articles/22/...

@evangowan.bsky.socialOct 8, 2026, 5:03 AM

Thank you. Alas, that website seem inaccessible (I can't even ping it). The main NASA website works, so I don't know why I can't access. Surely someone has already created an image showing the contrast between winter and summer of the Northern Hemisphere, though? This would be a textbook image.

@evangowan.bsky.socialOct 8, 2026, 2:50 AM

Thanks for the link, but that isn't really what I am looking for. I want a continental scale image. It would take a considerable amount of time to create my own image using that site for something that I just want to put in a single slide of a presentation.

@evangowan.bsky.socialOct 8, 2026, 2:39 AM

I really want to show that in the summer, everything is green, while in the winter everything is covered in snow or dead vegetation. I thought for sure Wikipedia or NOAA would have something like this, but I guess not!

@evangowan.bsky.socialOct 8, 2026, 2:38 AM

Maybe the Bluesky crowd can help me out with this. I want to get some cloudless satellite imagery to highlight the changes in the Northern Hemisphere (or even just Asia/North America) between winter and summer. Somehow, this is very difficult to track down. Any hints?

@evangowan.bsky.socialOct 7, 2026, 12:05 PM

Our paper, led by Karla Rubio-Sandoval, came out 2 years ago. In the village of Camarones, Argentina, we used the amino acid racemization to deduce sea level highstands for the Holocene, MIS 5e, and MIS 9/11! doi.org/10.1016/j.qu...

@evangowan.bsky.socialOct 7, 2026, 11:57 AM

Today's Nobel Prize in Chemistry celebrates the explanation for spontaneous homochirality (where a molecule will convert to its mirror image). This is the process that is behind amino acid racemization dating, which we have used for dating shells in beach deposits. www.nobelprize.org/prizes/chemi...

@evangowan.bsky.socialOct 7, 2026, 10:03 AM

Thanks Nina!

@evangowan.bsky.socialOct 7, 2026, 1:18 AM

Don't get me wrong, I like what they tried to do here with their sea level reconstruction. But it is clear that some major uncertainty factor is not being accounted for here.

@evangowan.bsky.socialOct 7, 2026, 1:18 AM

My reconstruction currently puts 31 m of sea level equivalent ice volume in the Laurentide at 40 ka, and I can't envision that number going up by more than 10 m from this configuration even with the assumption of a more hard bedded ice sheet. Where would you get 60 more meters of ice volume?

@evangowan.bsky.socialOct 7, 2026, 1:17 AM

The Eurasian Ice Sheet just had mountain-centered ice caps, as did the Cordillera Ice Sheet. The Laurentide Ice Sheet was restricted to the extent of the Canadian Shield in most places. The Antarctic Ice Sheets were not a major component of the global sea level fall, even at the LGM.

@evangowan.bsky.socialOct 7, 2026, 1:17 AM

Obviously figuring out past sea level is a big part of my research, through my ice sheet reconstructions. I think it is implausible to have global sea level at -101 m at 39 ka, because the ice sheets were far short of of their LGM limits at that point.

@evangowan.bsky.socialOct 7, 2026, 1:17 AM

Fujita et al estimate past "global" sea level (39-17 ka) from benthic large foraminifera assemblages from the Great Barrier Reef. Their estimates of past sea level are much lower than previous estimates, with MIS 3 sea level at 39 ka at -101 m, and an LGM lowstand of -137 m. doi.org/10.1016/j.ep...

@nature.comOct 6, 2026, 10:00 AMReposted by @evangowan.bsky.social

Francis Halzen wins the 2026 Nobel Prize in Physics for his work on a high-energy neutrino observatory at the South Pole

go.nature.com/4dYcCn5

@evangowan.bsky.socialOct 5, 2026, 12:27 AM

I currently live in a very rural part of Japan with the exact same problems of declining population and economic stagnation that were present where I grew up. The people are not resentful, but instead choose to try their best to preserve their culture with openness. It is amazing here.

@evangowan.bsky.socialOct 5, 2026, 12:24 AM

I grew up in a very conservative rural part of Manitoba. I was reading the local newspaper last week and they had an entire page dedicated to the town's first Pride parade, and it sounded like it was well received. The grievances expressed in rural America are a political choice.

@evangowan.bsky.socialOct 3, 2026, 9:12 AM

Definitely not the same scale, but there were still cracks in the ground when I visited my wife's property in Uki City last week.

@fikgm.bsky.socialOct 3, 2026, 7:24 AMReposted by @evangowan.bsky.social

Rice crops are harvested at the rice field where the recent Kumamoto Earthquake caused a surface rupture... Geologists are on site. More free photos in the newspaper "Mainichi" website: mainichi.jp/graphs/20261...

@evangowan.bsky.socialOct 1, 2026, 1:53 PM

The story about his bad day has everything I love. Raised beaches, proglacial lakes, and glaciation.

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