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Anya Hess

@anya-hess.bsky.social

Paleoceanographer and geochemist interested in ocean redox | Postdoc at WHOI | foraminifera | she/they 🏳️‍🌈

29 Posts322 Follower376 Folgt
Anya Hess@anya-hess.bsky.social · last mo.

Very excited to announce our paper is out in Science Advances @science.org! Our reconstructions show Pacific Walker Circulation was stronger during the Little Ice Age, consistent with projections of weakening with future warming www.science.org/doi/10.1126/... @whoi.edu @rutgersupress.bsky.social

A strong Pacific Walker Circulation during the Little Ice Age

Reconstructions of climate over the past millennium provide context for disentangling anthropogenic forcing from natural multidecadal variability. However, the strength of the east-west tropical Pacif...

science.org

Dr. Evan J. Gowan@evangowan.bsky.social · 10mo ago

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...

Projections of 21st-century sea-level fall along coastal Greenland - Nature Communications

Melting from the Greenland Ice Sheet triggers land uplift beneath the ice sheet and changes to Earth’s gravitational field and rotation axis, a process called Glacial Isostatic Adjustment. Lewright et...

nature.com

Dr. Or M. Bialik |📚|🔬|🌊|⚒️@obialik.bsky.social · 10mo ago

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. 🧪🌊

Ed Hathorne@edhathorne.bsky.social · 10mo ago

New paper shows: Sediment resuspension and reductive dissolution of terrigenous Fe-Mn oxides control dissolved neodymium and hafnium inputs from the Amazon shelf doi.org/10.1016/j.gc...

Anya Hess@anya-hess.bsky.social · 10mo ago

🚨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...

Contrasting evolution of the Arabian Sea and Pacific Ocean oxygen minimum zones during the Miocene - Communications Earth & Environment

The Arabian Sea and eastern tropical Pacific oxygen minimum zones were better oxygenated during the warm Miocene, but with regional complexities, according to analysis of trace elements and nitro...

nature.com

Patrick Rafter@oceanandclimate.bsky.social · last yr.

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. Here’s the story of how we got here after 15 years. many authors but shout out @jfarmersalmanac.bsky.social 🌊 www.science.org/doi/10.1126/...

Persistent eastern equatorial Pacific Ocean upwelling since the warm Pliocene

Upwelling generates a nutrient-rich “cold tongue” in the eastern equatorial Pacific Ocean (EEP), with impacts on global climate, oceanic biological productivity, and the carbon cycle. The cold tongue ...

science.org

David Ho@davidho.bsky.social · last yr.

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.

The First Planned Migration of an Entire Country Is Underway

The Pacific island nation of Tuvalu could be submerged in 25 years due to rising sea levels, so a plan is being implemented to relocate its population to Australia.

wired.com

Kevin J. Kircher@kevinjkircher.com · last yr.

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).

Richard Waite@waiterich.bsky.social · last yr.

Global emissions from heating are about 4x those from cooling. Air conditioning is an important and lifesaving adaptation to climate change. Decarbonize the grid.

James Rae@mudwaterclimate.bsky.social · last yr.

🚨New paper just out on environmental upset at the Triassic-Jurassic boundary🚨 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 🧪🌊⚒️🐚🧵

Journal title in Nature Communications
EGU Climate Division@egu-cl.bsky.social · last yr.

After a quiet period, we are very happy to finally join Bluesky!🦋. 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!😊 We are also on LinkedIn🎉 Come say hello! #EGU

EGU Climate Division | LinkedIn

EGU Climate Division | 5 followers on LinkedIn. Official account of EGU Division on Climate: Past, Present & Future (CL) | Official account of EGU Division on Climate: Past, Present & Future 🌤...

linkedin.com

Anya Hess@anya-hess.bsky.social · last yr.

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

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.
Chris Lowery@chrislowery.bsky.social · 2y ago

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

Nicolas Mainville@carbonick.bsky.social · 2y ago

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. 🌎

How more trees in cities could have saved 400,000 lives in Europe

‘Expanding greenness’ could save millions of lives, a comprehensive new study finds.

euronews.com

Jenn Fehrenbacher@jennfehrenbacher.bsky.social · 2y ago

These are some very unhappy Globigerina bulloides #Forams. I have no idea what is going on here. Are they decalcifying? What are the vacuoles around the specimen? Until this field season, I had never observed this. These were also in the high CO2 "bad water". Has anyone observed this before?

A Globigerina bulloides with a brand new chamber and a shell surrounded by or covered in small round vacuoles.A Globigerina bulloides with a brand new chamber and a shell surrounded by or covered in small round vacuoles.A Globigerina bulloides with a brand new chamber and a shell surrounded by or covered in small round vacuoles. There is debris in the spines here, typically a sign the forams is not doing well. They usually clear debris quickly. There was cytoplasm streaming on the spines, so it was definitely still alive. The shell is very thin.
Helen Czerski@helenczerski.bsky.social · 2y ago

These "Happy Raindrops" are very cute, but this shape is a very persistent myth - no raindrop has ever been that shape. Even at the moment a drop breaks away (see 2nd pic for reality). The boundary between air and water has surface tension & acts like an elastic sheet. Pointy regions don't form.

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