Dr. Thomas Felis
@thomasfelis.bsky.social
Coral archives | Past, present & future climate & environmental change | Paleoclimatologist/paleoceanographer at MARUM/University of Bremen | Coordinator DFG SPP 2299 www.marum.de/en/Coral-Paleoclimatology www.spp2299.tropicalclimatecorals.de
New puplication by @climatereefs.bsky.social 🪸 Corals are climate archives. Their skeletons show how El Niño and La Niña changed in the Pacific over 1,500 years ➡️ www.marum.de/en/Changing-... #MARUM #MarineResearch #ClimateResearch
🪸 Life is better in color! September is Coral Bleaching Awareness Month. We’re joining the Coral Reef Alliance and organizations worldwide in bleaching our logo to raise awareness of coral bleaching, one of the most visible signs of reef stress. 🔗 go.coral.org/coral-bleach...
So happy that this paper is finally out!
Tropical Climate Variability & Coral Reefs (SPP 2299)@climatereefs.bsky.social · 2w ago🌊 The past tells a more complex ENSO story. Corals from the Marshall Islands suggest changing ENSO diversity over the Common Era, including volcanic cooling—and that coral responses to thermal stress today are unlike those in the past. New paper out @commsearth.nature.com: doi.org/10.1038/s432...
🌊Central Pacific El Niño activity increased between the first and second millennia CE, while volcanic eruptions likely drove cooling episodes. @climatereefs.bsky.social @marumunibremen.bsky.social @thomasfelis.bsky.social @andydolman.bsky.social 👉Read more here: www.nature.com/articles/s43...
Western Pacific corals reveal Common Era changes in ENSO-diversity, thermal stress, and volcanic cooling - Communications Earth & Environment
Central Pacific El Niño activity increased between the first and second millennia of the Common Era, while volcanic eruptions likely drove cooling episodes and thermal stress impacted calcification on...
nature.com
📢 New paper out! 🌊 Why do some coral reefs survive marine heatwaves better than others? The answer lies far beyond the reef itself. Natural coral reef refuges are dynamic. Their cooling depends on tropical climate modes (ENSO,IOD), shaping coral resilience in a warming ocean Read more: rdcu.be/fq0ml
Tropical climate modes control strength and distribution of thermal stress mitigation in a coral reef refugia
Scientific Reports - Tropical climate modes control strength and distribution of thermal stress mitigation in a coral reef refugia
rdcu.be
#SPP2299 phase 1 coordinator @thomasfelis.bsky.social presenting the @dfg.de priority programme at the 3rd Taiwan International Symposium on Coral Reefs (TISCR 2026) in Kaohsiung today @marumunibremen.bsky.social
World’s Fourth Mass Coral Bleaching Event Likely Ended in 2025 www.nesdis.noaa.gov/news/worlds-...
World’s Fourth Mass Coral Bleaching Event Likely Ended in 2025
NOAA experts have determined that the fourth global coral bleaching event likely concluded in mid-2025 following unprecedented heat stress across the world’s coral reefs.
nesdis.noaa.gov
The 3rd Taiwan International Symposium on Coral Reefs (TISCR 2026) has just begun. SPP 2299 will be giving a presentation this afternoon in sunny Kaohsiung
New study by #SPP2299 researcher Takaaki Watanabe published in open-access Geophysical Research Letters: agupubs.onlinelibrary.wiley.com/doi/10.1029/... "Coral Reefs in the Indonesian Seas Threatened by Heat and Cold Stress" @agu.org @uni-kiel.de #AGUPubs #CAU #UniKiel
Coral Reefs in the Indonesian Seas Threatened by Heat and Cold Stress
In the Indonesian Seas, cold stress events caused by positive Indian Ocean Dipole are stronger and longer-lasting than heat stress events Heat stress events in the Indonesian Seas, triggered by E...
agupubs.onlinelibrary.wiley.com
New blog about #SPP2299 early career researcher Diana Diers from @goetheuni.bsky.social: "What can coral geochemistry reveal about past climate variability?" Check it out on our website: www.spp2299.tropicalclimatecorals.de/2026/05/06/w... www.spp2299.tropicalclimatecorals.de
#SPP2299 early career researcher @hcamelia.bsky.social is presenting the currently longest monthly coral proxy time series of temperature and hydrology for the northeastern Indian Ocean, back to the late 18th century, at #EGU26 www.spp2299.tropicalclimatecorals.de @marumunibremen.bsky.social
New blog post on our website highlighting the #SPP2299 EOCENE project at Leipzig University: From Fossil Corals to Climate Data: Methods and Insights share.google/0jb2vokX5qTv...
Check out our new #SPP2299 paper in @commsearth.nature.com on signal and noise in coral records, by Andrew Dolman Strontium to calcium ratio and oxygen isotopic coral records can exaggerate past decadal tropical climate variability | Communications Earth & Environment share.google/yj9l8tZ5wE2X...
New blog on our website about the @pages-ipo.bsky.social CoralHydro2k Seawater δ¹⁸O Database, an initative lead by Alyssa Atwood, with contribution by #SPP2299. Check it out! Unlocking Hidden Stories of the Ocean: A New Global Database of Seawater Oxygen Isotopes share.google/gCoxSflxgdMV...
Unlocking Hidden Stories of the Ocean: A New Global Database of Seawater Oxygen Isotopes
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Unlocking Hidden Stories of the Ocean: A new study introduces a global database of oxygen isotopes in seawater. The researchers have compiled measurement data into a unified, freely accessible, and standardized resource ➡️ www.marum.de/en/Unlocking...
The #SPP2299 team @marumunibremen.bsky.social has contributed to an international initiative, a database of oxygen and hydrogen isotope measurements in seawater for research into the global water cycle and climate change @jannhargreaves.bsky.social @thomasfelis.bsky.social @pages-ipo.bsky.social
The PAGES CoralHydro2k Seawater δ18O Database: a FAIR-aligned compilation of seawater δ18O data to uncover “hidden” insights from the global ocean
Abstract. The stable isotope values of seawater (δ18O and δ2H) provide valuable information on the exchange of water between the ocean, atmosphere, and cryosphere and on ocean mixing processes. As suc...
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Our @pages-ipo.bsky.social Seawater δ18O database paper has been published! essd.copernicus.org/articles/18/... 🧪🌊🪨🐚 (Alyssa Atwood, @jannhargreaves.bsky.social, @thomasfelis.bsky.social, and many others!)
The PAGES CoralHydro2k Seawater δ18O Database: a FAIR-aligned compilation of seawater δ18O data to uncover “hidden” insights from the global ocean
Abstract. The stable isotope values of seawater (δ18O and δ2H) provide valuable information on the exchange of water between the ocean, atmosphere, and cryosphere and on ocean mixing processes. As suc...
essd.copernicus.org
Andrea@oceandrea.bsky.social · last yr.Need to calibrate your δ18Osw-based proxies, but can't find the right data? We've got you, FAIR! Check out our new @pages-ipo.bsky.social seawater δ18O database preprint at ESSD! (With Alyssa Atwood, @thomasfelis.bsky.social, @kimcobb.bsky.social, and more!) 🌊🧪 essd.copernicus.org/preprints/es...
Well done, Hana! A happy Hana Camelia and her examination committee after successfully defending her doctoral thesis yesterday at the University of Bremen. It was great to have you as a doctoral student @climatereefs.bsky.social @marumunibremen.bsky.social
New blog on our website! Check it out! How Life at Sea Prepared Luisa Meiritz for Studying Coral Bleaching share.google/pMh2OSHXN5r7... @geomarkiel.bsky.social
How Life at Sea Prepared Luisa Meiritz for Studying Coral Bleaching
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The DFG Priority Programme “Tropical Climate Variability & Coral Reefs” (SPP 2299) has released a new video highlighting the programme’s current research activities and outlining upcoming scientific priorities. Check out the new video on our YouTube channel: youtu.be/PUQUnIhgVEk?...
SPP 2299 Research & Future Directions
YouTube video by Tropical Climate Variability & Coral Reefs
youtu.be
[ENSO Webinar Series] We are pleased to invite you to join us for the first webinar of the CLIVAR Pacific Region Panel’s newly launched ENSO webinar series: January 22, 2026 | 07:00 UTC GoTo Meeting – meet.goto.com/198838725 Scan the QR code to sign up Check more: www.clivar.org/events/enso-...
See our new paper lead by Ryuji Asami on fossil corals drilled at Tahiti by @ecord.bsky.social IODP Exp. 310 CP - Penultimate glacial sea surface temperature and hydrologic variability in the tropical South Pacific from 150 ka Tahiti corals share.google/2WMYl0YClhX9... @marumunibremen.bsky.social
Penultimate glacial sea surface temperature and hydrologic variability in the tropical South Pacific from 150 ka Tahiti corals
Abstract. Constraining climate models under extreme boundary conditions of the past on societally-relevant timescales is complicated by a common lack of high-resolution reconstructions of sea surface ...
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Some AI suggested that I shouldn't always post about corals and climate. So I'll give this a try: Christmas market in Bremen 2025
Check out our latest work, led by Jon Jung, Ph.D. student in the @amglab.bsky.social at @mpic.de: www.nature.com/articles/s41... Here we show that the supply of excess phosphorous from accounts for the majority of observed Sargassum variability since 2011. 🌊 🧪 #Paleosky #CoralReefs
Equatorial upwelling of phosphorus drives Atlantic N2 fixation and Sargassum blooms - Nature Geoscience
High near-surface nitrogen-fixation rates that promoted the recent growth of the Great Atlantic Sargassum Belt were tied to greater upwelling of phosphorus from the equatorial Atlantic, according to c...
nature.com