Understanding Greenland's response to climate change is critical, and depends on Greenland's sovereignty and inclusion in NATO
21.01.2026 12:49
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Understanding Greenland's response to climate change is critical, and depends on Greenland's sovereignty and inclusion in NATO
Lewright et al provide a prediction of relative sea level change by the end of the 21st century for Greenland. Due to glacial isostatic adjustment effects, most of Greenland will experience a sea level fall of over 1 m by the end of the century. www.nature.com/articles/s41...
Multiscale characterization of Mn-templated protodolomite formed under electrochemical and carboxyl modulation
We have a new preprint, led by @petrash.bsky.social, using wicked electrochemistry and really nifty microscopy to look at how manganese redox cycling and carboxyl groups play into the formation of protodolomite. π§ͺβοΈ
eartharxiv.org/repository/v...
Neodymium is one of those elements who's budget in the ocean is off (unbalanced), also, we don't know where all the Nd is coming from. This study shows that the dissolution of iron-manganese (Fe-Mn) oxyhydroxides in resuspended sediments and dissoltuion in pore water are an important source. π§ͺπ
Interesting! I wonder if this has implications for the thallium isotope proxy for whole-ocean oxygenation
I bet we have enough happily pedantic scientists in this chat to solve this problem...semi-monthly?
Thanks to all our co-authors Yair Rosenthal, Daniel Sigman, and @amglab.bsky.social, host institutes @rutgersupress.bsky.social @marine.rutgers.edu @unisouthampton.bsky.social @mpic.de @whoi.edu @princeton.edu, and funders @snsf.ch @maxplanck.de NSF, IODP, and Rutgers
Our results show that global warming can increase oxygen levels, but the effects of regional processes (like monsoon strength, surface stratification, and marginal-sea outflows) may be substantial, an important consideration for predicting
the future of ocean oxygenation in the Arabian Sea.
Progression of deoxygenation also differed. After the warm period, the Arabian Sea lost oxygen over 2.5 Myr, with delayed onset of denitrification compared to the Pacific.β¨ The lag points to regional drivers in the Arabian Sea, like (proto)monsoonal activity and Tethys outflow.
Our earlier work in the Pacific showed that it too was better oxygenated during the warm Miocene, but comparison of these datasets reveals the amount of dissolved oxygen was different.β¨ The Pacific was fully oxic (>90 umol/kg) while the Arabian Sea was hypoxic (5-90 umol/kg).
Using planktic foraminiferal Mn/Ca, I/Ca, and foraminiferaβbound Ξ΄15N, we tracked oxygen levels across the Arabian Sea to distinguish between hypoxia and true oxygen deficiency with denitrification. This is the first quantitative study of Miocene oxygenation in the Arabian Sea.
π¨New paper out with @alexauderset.bsky.social! We show that the Arabian Sea oxygen minimum zone (OMZ) was better oxygenated during the warm Miocene Climate Optimum than today, but its path to full deoxygenation was slow and complex.
Link to paper: www.nature.com/articles/s43...
Read this from Ben Santer (very famous climate scientist for those who donβt know) about what NCAR means and what dismantling it will do.
It was a pleasure to dive into this excellent paper by Rafter et al. @oceanandclimate.bsky.social (www.science.org/doi/10.1126/...) and help with writing this perspective piece
Thanks Patrick! They re-drafted the figure for us, but I did make the original with similar colors. I'm a big fan of your color palettes and have used then in ODV.
Today, we published a study long in the making on how upper and subsurface tropical Pacific waters responded (and maybe will adjust) to warmer global climate. Hereβs the story of how we got here after 15 years. many authors but shout out @jfarmersalmanac.bsky.social
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www.science.org/doi/10.1126/...
π’The Past Ocean Oxygenation @pages-ipo.bsky.social Working Group is here! π€ We provide insights into the natural variability of seawater oxygen in key periods of the geological record & communicate the science behind oxygen reconstructions π³ PO2 is here! pastglobalchanges.org/science/wg/p...
Can we have a tldr for those who prefer written over oral communication?
A schematic showing carbon isotope values for different benthic foraminiferal species living in sedimentary habitats reflecting different methane and dissolved inorganic carbon (DIC) values. IFA = individual foraminiferal analyses. SMTZ = sulfate-methane transition zone.
A scanning electron microscope image of an intact versus a broken benthic foraminiferal test belonging to the genus Pyrgo.
Led by U. LA Lafayette Ph.D. student Gracie Babineaux, we have a new paper out in #EPSL showing how individual foraminiferal δ¹³C analyses of benthic Pyrgo spp. can record short-lived #methane seepage events from the seafloor. π
www.sciencedirect.com/science/arti...
The first planned migration of an entire country due to climate change is happening! Tuvalu, a Pacific island nation, is at risk of being submerged under rising sea level, so it has signed an agreement with Australia to allow 280 Tuvaluans to settle in Australia as permanent residents each year.
Yes. Air conditioners are all powered by electricity, so will get cleaner as we clean up the grid. Heat, by contrast, is mostly fossil-fueled. The real goals, IMO, are ensuring that a) everyone who will need AC in outr heated world, gets it; b) all those ACs are heat pumps (ACs that can also heat).
It's going to be a grand old (like 5-23 My old) time!
Journal title in Nature Communications
π¨New paper just out on environmental upset at the Triassic-Jurassic boundaryπ¨
Using boron isotopes in fossil oysters, we find a major pulse of ocean acidification and CO2 rise, driving global warming and delaying ecosystem recovery following the end-Triassic mass extinction
rdcu.be/ev6XV
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After a quiet period, we are very happy to finally join Bluesky!π¦. This is the official account of the #Climate Division of the @egu.eu
Follow us to stay up to date with Division news, blog posts, Campfires, ways to get involved, and more!π
We are also on LinkedInπ Come say hello!
#EGU
The N-S equatorial Pacific cross section in this post is Fig. 1C. I created it during my PhD when I was trying to understand this OMZ and couldn't find any similar figures out there, so I made my own. I'm so happy to have found a good home for it!
South-North cross section through the eastern tropical Pacific oxygen minimum zone. It shows the north and south lobe of the oxygen minimum zone, separated by the equatorial undercurrent. The Peru-Chile current and California Current ventilate the near-surface waters, North Pacific Intermediate waters bring low-oxygen waters to the northern lobe at ~550m, and Antarctic Intermediate Waters ventilate the southern lobe at the same depth. The oxygen minimum zone is fueled by Ekman upwelling and remineralization of sinking organic material.
In this paper, we present new global calibrations for the I/Ca proxy for ocean oxygenation, with the first Pacific transect. By comparing data from planktonic foram species that live at different water depths, we gain a better understanding of the proxy and its relationship to O2
#paleoceanography
On my last exam for Marine Geology one of the questions was "what was the most important thing you learned in this class?" and by far the most common answer was some version of "how the record of past climate change can help us understand what's happening now". The people hunger for Paleoceanography
So happy to have been a part of this π
A new study has calculated that increasing vegetation in urban areas by 30 per cent could have prevented more than one third of all global heat-related deaths between 2000 to 2019. In total, 1.16 million lives may have been saved with more greenery during this 20-year period. π