Jacob Wenegrat
@roguewave.bsky.social
Physical oceanographer, Assistant Professor at University of Maryland College Park.
Geophysical fluid dynamics, submesoscales, sailing, and…
wenegrat.github.io
Geophysical fluid dynamics, submesoscales, sailing, and…
wenegrat.github.io
Proud new owner of a bathythermograph!
October 7, 2025 at 11:53 PM
Proud new owner of a bathythermograph!
Ok, so hear me out...
August 15, 2025 at 2:49 PM
Ok, so hear me out...
Sign by our 3rd grader, who couldn’t be more excited about having scored a signature from Bill Nye!
March 7, 2025 at 9:36 PM
Sign by our 3rd grader, who couldn’t be more excited about having scored a signature from Bill Nye!
March 7, 2025 at 6:50 PM
Tis' the season for making paper oceanography globes!
🌊
via Barry Klinger mason.gmu.edu/~bklinger/Se...
🌊
via Barry Klinger mason.gmu.edu/~bklinger/Se...
December 6, 2024 at 3:11 PM
Tis' the season for making paper oceanography globes!
🌊
via Barry Klinger mason.gmu.edu/~bklinger/Se...
🌊
via Barry Klinger mason.gmu.edu/~bklinger/Se...
In the manuscript we also show that this change is consistent with a combination of surface warming, and a southward shift of the gyres by about 1°.
Further, most of these changes happened in the last half of the 20th century, with little subsurface change before ~1950.
10/12
Further, most of these changes happened in the last half of the 20th century, with little subsurface change before ~1950.
10/12
November 13, 2024 at 3:59 PM
In the manuscript we also show that this change is consistent with a combination of surface warming, and a southward shift of the gyres by about 1°.
Further, most of these changes happened in the last half of the 20th century, with little subsurface change before ~1950.
10/12
Further, most of these changes happened in the last half of the 20th century, with little subsurface change before ~1950.
10/12
We compare these historical observations to modern data to estimate the change in ocean temperature over the 20th century in the subsurface Indian Ocean, which reveals warming down to 750 m depth.
9/12
9/12
November 13, 2024 at 3:59 PM
We compare these historical observations to modern data to estimate the change in ocean temperature over the 20th century in the subsurface Indian Ocean, which reveals warming down to 750 m depth.
9/12
9/12
For me, as an (completely amateur) historian of ocean sciences, it was really fun to consider these observations in light of the many sources of error associated with them. These range from errors in celestial navigation to stretching of the hemp line, and more.
8/12
8/12
November 13, 2024 at 3:59 PM
For me, as an (completely amateur) historian of ocean sciences, it was really fun to consider these observations in light of the many sources of error associated with them. These range from errors in celestial navigation to stretching of the hemp line, and more.
8/12
8/12
The original records are all in German, so we enlisted the help of Ursula Rack, an historian at the U. of Canterbury, who gave us more context and translations.
Here's an example of the Valdivia observations.
7/12
Here's an example of the Valdivia observations.
7/12
November 13, 2024 at 3:59 PM
The original records are all in German, so we enlisted the help of Ursula Rack, an historian at the U. of Canterbury, who gave us more context and translations.
Here's an example of the Valdivia observations.
7/12
Here's an example of the Valdivia observations.
7/12
Here's an example of observations from the SMS Gazelle, taken on Christmas day 1874 in the Southern Ocean!
6/12
6/12
November 13, 2024 at 3:59 PM
Here's an example of observations from the SMS Gazelle, taken on Christmas day 1874 in the Southern Ocean!
6/12
6/12
Emma Bonanno, UMD undergrad, and I identified 3 German Oceanographic expeditions of the late 19th and early 20th century, and digitized their records from the original cruise reports.
The SMS Gazelle (1874-1876), Valdivia (1898-1899), and SMS Planet (1906-1907).
4/12
The SMS Gazelle (1874-1876), Valdivia (1898-1899), and SMS Planet (1906-1907).
4/12
November 13, 2024 at 3:59 PM
Emma Bonanno, UMD undergrad, and I identified 3 German Oceanographic expeditions of the late 19th and early 20th century, and digitized their records from the original cruise reports.
The SMS Gazelle (1874-1876), Valdivia (1898-1899), and SMS Planet (1906-1907).
4/12
The SMS Gazelle (1874-1876), Valdivia (1898-1899), and SMS Planet (1906-1907).
4/12
A little thread* about a fun paper that came out of an undergrad senior capstone here at UMD. With Emma Bonnano, Ursula Rack, and Jake Gebbie.
'A century of observed temperature change in the Indian Ocean'
agupubs.onlinelibrary.wiley.com/doi/full/10....
1/12 🌊
*moved from the bad place
'A century of observed temperature change in the Indian Ocean'
agupubs.onlinelibrary.wiley.com/doi/full/10....
1/12 🌊
*moved from the bad place
November 13, 2024 at 3:59 PM
A little thread* about a fun paper that came out of an undergrad senior capstone here at UMD. With Emma Bonnano, Ursula Rack, and Jake Gebbie.
'A century of observed temperature change in the Indian Ocean'
agupubs.onlinelibrary.wiley.com/doi/full/10....
1/12 🌊
*moved from the bad place
'A century of observed temperature change in the Indian Ocean'
agupubs.onlinelibrary.wiley.com/doi/full/10....
1/12 🌊
*moved from the bad place
An important limitation of this work is that we estimate using theory (not directly), which exposes some of the limitations in our current understanding of how these processes work. That is the subject of ongoing work!
Happy to chat more with anyone who is interested!
Thanks for reading!
5/5 🌊
Happy to chat more with anyone who is interested!
Thanks for reading!
5/5 🌊
November 7, 2024 at 3:50 PM
An important limitation of this work is that we estimate using theory (not directly), which exposes some of the limitations in our current understanding of how these processes work. That is the subject of ongoing work!
Happy to chat more with anyone who is interested!
Thanks for reading!
5/5 🌊
Happy to chat more with anyone who is interested!
Thanks for reading!
5/5 🌊
Here we tried to use theory, along with the best existing global high-res ocean simulation to estimate how much energy would be transferred from fronts to turbulence if we could run a global turbulence resolving simulation.
Our answer? A lot!
Where? All over!
3/n
Our answer? A lot!
Where? All over!
3/n
November 7, 2024 at 3:47 PM
Here we tried to use theory, along with the best existing global high-res ocean simulation to estimate how much energy would be transferred from fronts to turbulence if we could run a global turbulence resolving simulation.
Our answer? A lot!
Where? All over!
3/n
Our answer? A lot!
Where? All over!
3/n
Here’s a satellite image of eddies in a phytoplankton bloom that looks like a face.
October 2, 2024 at 11:11 PM
Here’s a satellite image of eddies in a phytoplankton bloom that looks like a face.
Made some eddies in class yesterday.
Lab demos are always a fair amount of work to set up, but so worth it. 🌊
Lab demos are always a fair amount of work to set up, but so worth it. 🌊
October 2, 2024 at 10:30 AM
Made some eddies in class yesterday.
Lab demos are always a fair amount of work to set up, but so worth it. 🌊
Lab demos are always a fair amount of work to set up, but so worth it. 🌊
This led to what might be the first published mention of 'geostrophic' balance in 1917 (typo above)...in a paper titled 'Gradient Wind'.
4/🌊
4/🌊
September 26, 2024 at 2:27 PM
This led to what might be the first published mention of 'geostrophic' balance in 1917 (typo above)...in a paper titled 'Gradient Wind'.
4/🌊
4/🌊
Shaw wanted to indicate that Earth's rotation 'bends' the wind, hence the choice between Geostrophic or Geostrepsic.
3/🌊
3/🌊
September 26, 2024 at 2:25 PM
Shaw wanted to indicate that Earth's rotation 'bends' the wind, hence the choice between Geostrophic or Geostrepsic.
3/🌊
3/🌊
One of the awesome things about teaching is getting asked obvious questions that I've never thought about. Like why is it called 'geostrophic' balance?
Turns out, we might have ended up calling it 'geostrepsic' balance were it not for Sir Napier Shaw F.R.S.
1/🌊
Turns out, we might have ended up calling it 'geostrepsic' balance were it not for Sir Napier Shaw F.R.S.
1/🌊
September 26, 2024 at 2:19 PM
One of the awesome things about teaching is getting asked obvious questions that I've never thought about. Like why is it called 'geostrophic' balance?
Turns out, we might have ended up calling it 'geostrepsic' balance were it not for Sir Napier Shaw F.R.S.
1/🌊
Turns out, we might have ended up calling it 'geostrepsic' balance were it not for Sir Napier Shaw F.R.S.
1/🌊
You should join our group. It’s fun! 😂
March 6, 2024 at 12:14 AM
You should join our group. It’s fun! 😂
This is pretty fun!
Enter your google scholar id to generate your own.
shiny.rcg.sfu.ca/u/rdmorin/sc...
Enter your google scholar id to generate your own.
shiny.rcg.sfu.ca/u/rdmorin/sc...
February 4, 2024 at 2:53 PM
This is pretty fun!
Enter your google scholar id to generate your own.
shiny.rcg.sfu.ca/u/rdmorin/sc...
Enter your google scholar id to generate your own.
shiny.rcg.sfu.ca/u/rdmorin/sc...
Applications open for a 2024 Summer School on 'Topics in Turbulence' here at UMD, aimed at the advanced graduate student level.
December 6, 2023 at 9:30 PM
Applications open for a 2024 Summer School on 'Topics in Turbulence' here at UMD, aimed at the advanced graduate student level.