Our recent paper on using thermal imagery from geostationary satellites to infer surface currents was published! We call the method GOFLOW 🧪🌊 www.nature.com/articles/s41...

Nearing the end of semester two at Georgia Tech, and I am so grateful this team who does awesome science. As our group keeps growing, I will always value the work each of them - one amazing postdoc (@yangx309.bsky.social) and the spectacular GATO “undergrad army” - did to help get us off the ground.

doi.org/10.1021/acse... Thorough retrospective and touching tribute by John's long time collaborator, Rick Flagan (H/T @ryanward.bsky.social)

Since 2016, Antarctic sea ice extent has been declining sharply – now scientists are piecing together how strong winds and warm deep water have played a part in this abrupt transition

Fantastic morning at the Atlanta Science Festival, featuring the President of Georgia Tech stopping by the @gtsciences.bsky.social Earth & Atmospheric Sciences booth to learn about earthquakes and water filtration! 🧪🔬

30+ years ago, I learned an analytical technique as a summer intern that set the course of my career. Now, I'm the only scientist in the world still using it. The scientists we don't train today because of funding and program cuts from the Trump regime are the scientists we won't have in the future.

This should be the biggest weather and climate news on your radar today. You can send an email today to say why dismantling NCAR is a bad idea for everyone: [email protected]

One reason I love going to my grad school friends' weddings is because they inevitably play "We Found Love In A Hopeless Place" and the whole group on the dance floor is just like "yeah that's Caltech."

This is the second time Ito has had to step down over his ties to Epstein (first was from leading the MIT Media Lab in 2019). It’s notable he was able to get another leadership position. Really tells you something about how we as a society treat those who align themselves with sexual harassers.

My latest: www.science.org/doi/10.1126/... Next column will address needed guardrails for private funding of science, esp. in light of #Epstein/ #Summers etc.

Reconciliation begins with recognition of truths. Well done to the Kelvingrove Museum in Glasgow. 🏴󠁧󠁢󠁳󠁣󠁴󠁿

Thursday at #OSM26, I’ll be sharing our (with my team at @imas-utas.bsky.social ) work on a new approach for describing how sea ice retreat timing impact the spring bloom phenology and thus carbon cycle in the Weddell Sea by using data from @bgc-argo.bsky.social . See you at poster OB44K-0568!

Fresh off the preprint server! @maratimes.bsky.social and I show how data from the overlapping SWOT and PACE satellite missions present a step forward in our ability to observe linked biogeochemical-physical processes in the ocean. We look forward to chatting about this with folks at #OSM2026! 🌊

US CLIVAR is looking for new panel members! If you're interested in an opportunity to contribute your expertise, expand your network, and shape the future of climate science, we encourage you to apply! 📄 Learn more and apply: usclivar.org/2026-call-us... 🗓 Application deadline: March 23, 2026

Rejecting science, Trump reverses conclusion that climate change is harming Americans

As I say here, there is no scientific justification to revoke the engagement finding. In fact, over the last 15+ yrs, the evidence of how climate change affects our health has only grown. Higher risk of allergies, dementia, fertility, heart disease, and death: that’s what’s on the line. @nature.org

Surface ocean processes impact structure deep into the ocean interior. In our perspective paper, @maratimes.bsky.social, grad student Katarina Merk, and I discuss using physical perspectives to interpret subsurface biogeochemical distributions and why we as a community should care! 🌊

Italy did a nice job hosting the Olympics opening ceremony in four cities. 🔥 I propose the LA Olympics 2028 do the same: SoFi Stadium (Inglewood), Rose Bowl (Pasadena), somewhere in the Valley, and somewhere in Orange County.

After yrs of planning & preparing, things didn't work @ the last minute. I deeply feel for these scientists. Our Antarctic project is smaller scale—but we faced continuous setbacks, from govt, Mother Nature, tech. We get so little time to do our work here; setbacks are heartbreaking #oceanography 🇦🇶🌊

🌊

To study the distribution of phytoplankton🦠 and marine snow❄️, we are sending a holographic camera down on the CTD rosette to a take a 3D image every second. Then we can reconstruct bio volume and export! The most common phytoplankton on this cruise has been Chaetoceros socialis (⬇️) #oceanography 🇦🇶🐧🌊

Know an awesome undergraduate student who would benefit from the opportunity to do research in the geosciences this summer? Applications are open for the Georgia Tech Broadening Participation REU (due February 15). 🌊 ☁️ 🌍 🧪

Science research vessel traffic jam in Punta Arenas! 🌊⛴️Currently around port are the RV Roger Revelle (USA), RSS Sir David Attenborough (UK), Icebreaker Noosfera (Ukraine), and Xue Long 2 (China). Soon we on the RV Sikuliaq (USA) will join the party!

A lullaby from the skies in the Magellan Straits last night. 🌊 ☁️

We’ve entered the Straits of Magellan, at the southern end of Chile. It’s absolutely beautiful!

51S, 94W: we have a new guest on board - a Nazca booby! Usually found near the Galapagos, this guy is far out of his typical range. Aptly, our stowaway is hanging out on the crow’s nest. Photo by Pablo Cohn.

2025 goes down as the ~3rd-warmest year on record (based on ERA5). Like in 2024, every single day this past year was warmer than the average of even the most recent reference period (1991-2020).

Know an undergraduate looking for an opportunity to get paid to do cryospheric or other geoscience research this summer? Let them know about the GT EAS Broadening Participation REU here in Atlanta. Now accepting applications through ETAP! easreu.eas.gatech.edu

It’s very biologically quiet out here on the South Pacific, but we got the company and blessing of a beautiful albatross earlier. 🌊 39S, 122W

Today's satellite shoutout 🛰️ is to NASA PACE, which gives us data of ocean color, biogeochemistry, and ecology! 🌊 🧪 Here is chlorophyll-a (signature of photosynthesizing plankton) along with ocean current magnitude and direction (arrows). The red dot is where I currently am on the RV Sikuliaq! ⛴️

Living a dream come true and chasing ocean eddies in real time thanks to the NASA SWOT satellite. 🌊 🛰️ ⛴️ 🧪 SWOT provides us "swaths" of data about water elevation for both the ocean and large freshwater reservoirs. I use this data to track small-scale ocean currents and watch how they evolve.

A Christmas gift to the ocean from the team aboard the RV Sikuliaq: one specially wrapped biogeochemical-Argo float from @bgc-argo.bsky.social! 🌊 Profiling floats allow us to get real-time ocean data, helping us be in tune with ocean health and changes.

Home for the next few weeks. Gotta say, Tahiti is a funny place to board an icebreaker! 🌊⛴️

Everyone always asked why I moved to landlocked Colorado to do oceanography. Because it was the world's largest concentration of climate scientists. Because of NCAR and NOAA. In Boulder, fewer are alarmists; they are overwhelmingly problem solvers. NCAR's science is patriotic. Vought is not. 🌊

AGU has a Congressional email and call script up on NCAR:

Friends at NCAR, we're with you. @ncar-ucar.bsky.social is a trailblazer in community modelling driven not by idealogy, but by open science. We share all our code, thoughts, ideas. These can't be shut down. We'll fight and find every mechanism to support the ongoing CESM community.

For a few weeks, I will be sailing on the RV Sikuliaq from Papeete, Tahiti to Punta Arenas, Chile. ⛴️ Stay tuned for some fun science in the South Pacific! In an especially fun fact, we will be sailing close (in an ocean sense) to Point Nemo, the place in the ocean that is farthest from land. 🌊

I regret to inform everybody that I failed and now have to settle for my backup: being a professor.

⚒️ Article: Earthquakes influence the amount of hydrothermal iron entering the ocean over the Australian Antarctic Ridge, which can support phytoplankton blooms by relieving surface iron limitation www.nature.com/articles/s41...

Delighted that one of my Antarctic winter photos has won the 2025 Royal Society Photography Competition, Earth Science & Climatology category. Captured during polar-night surveys of ocean conditions near Antarctic Peninsula glaciers. royalsociety.org/journals/pub...

The National Oceanic and Atmospheric Administration’s data has been crucial in predicting and guiding preparation efforts for severe weather events across the country, especially throughout hurricane season.

“I have found that the longer I exist as an expert in my own field of science, the less I like to assert a piece of knowledge with great certainty.” Beautiful writing that is helping me reflect on my assumptions in oceanography (and all the other amazing things I have the honor of learning!). 🌊

Things that will get you kicked out of academia forever: - taking maternity leave at the wrong time - spending too much time with your kids - reporting harassment - not moving every 2-3 years - taking a partner's job/preferences into account - mouthing off before tenure

The notion that someone who is in their 20's can't have experienced climate change (supposedly due to an IPCC definition) is utter crap. It's embarrassing for a supposedly serious academic to be so disingenuous.

Taking solace in the great Isabel Allende's words today: "The patriarchy is stony. Feminism, like the ocean, is fluid, powerful, deep and encompasses the infinite complexity of life; it moves in waves, currents, tides and sometimes in storms. Like the ocean, feminism never stays quiet."

I feel like "the ocean makes half the O2 we breathe" is the chemical oceanographers version of the "gulf stream = AMOC" misunderstanding physical oceanographers deal with... 🌊

“Dr. Marks is one of a handful of NOAA retirees who have been working on a volunteer basis this hurricane season to make sure that the significant improvements in forecasting capabilities over recent decades can continue despite large staff losses orchestrated by the Trump administration”

Just re-read Ancillary Justice after a decade, for the upcoming Reading Circle meeting. Here is a book that has aged spectacularly well. Twelve years after publication, still feels every bit the genre-defining novel that it was when it was written.

Deciding that someone is unable to perform a physical job due to a disability, without ever once including that person in the conversation or hearing their expertise on their own body, directly violates their civil rights. Science does this regularly, has for generations, and it’s never been okay.