willerstorfi - Network

finally, hats off to Nele Meckler for her extremely candid and fair reviews of this work!

finally, hats off to Nele Meckler for her extremely candid and fair reviews of this work!

Benthics are more ambiguous; modern measurements appear offset from planktics, however applying an planktic/equilibrium calibration to the...

Benthics are more ambiguous; modern measurements appear offset from planktics, however applying an planktic/equilibrium calibration to the Cenozoic D47 record of Meckler largely reconciles it with the benthic 18-O temperature record

Using the same framework we revisit the three most recent D47 calibration papers in foraminifera. We find excellent agreement between 18-O...

Using the same framework we revisit the three most recent D47 calibration papers in foraminifera. We find excellent agreement between 18-O and D47 temperatures for planktics, which appear to follow modern largely inorganic D47 calibrations

Based on a large compilation of (existing) core top data, we show most planktic samples record 18-O temperatures consistent with...

Based on a large compilation of (existing) core top data, we show most planktic samples record 18-O temperatures consistent with climatological temperature/d18Osw at their expected living depth, but a sizeable minority have heavier-than-expected d18O, best explained by calcification in deeper waters.

We find that although 18-O fractionation differs between species, its temperature sensitivity remains indistinguishable from inorganic...

We find that although 18-O fractionation differs between species, its temperature sensitivity remains indistinguishable from inorganic calcite, and we provide an updated reference table with species specific alpha-18 - T relationships.

We provide an open source framework bringing together data on species specific 18O-fractionation laws, planktic living depths, and seawater...

We provide an open source framework bringing together data on species specific 18O-fractionation laws, planktic living depths, and seawater temperature/d18Osw/chemistry. All code is available at https://zenodo.org/records/10013595

Excited to share a new paper by Mathieu Daeron and myself ‘Revisiting Oxygen-18 and Clumped Isotopes in Planktic and Benthic...

Excited to share a new paper by Mathieu Daeron and myself ‘Revisiting Oxygen-18 and Clumped Isotopes in Planktic and Benthic Foraminifera’

https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2023PA004660

using d18Ocalcite as a paleo conservative tracer we show increased layering of the the deep Pacific at the LGM which would weaken this...

using d18Ocalcite as a paleo conservative tracer we show increased layering of the the deep Pacific at the LGM which would weaken this return pathway from the abyss, as well as an expansion of NPIW in the upper 1.5 km - these changes would likely increase oceanic carbon storage

we identify diapycnal mixing in the subarctic Pacific as an important pathway for the return of tracer from the abyssal ocean to the surface...

we identify diapycnal mixing in the subarctic Pacific as an important pathway for the return of tracer from the abyssal ocean to the surface in the modern ocean

using conservative tracers we show that the ventilation of mid-depths of the Pacific is dominated by isopycnal diffusion, such that the...

using conservative tracers we show that the ventilation of mid-depths of the Pacific is dominated by isopycnal diffusion, such that the mid-depths of the Pacific are largely excluded from the global overturning circulation

Changes in the reservoirs and transports of carbon in the Pacific are thought to be crucial to regulating CO2 on millennial timescales,...

Changes in the reservoirs and transports of carbon in the Pacific are thought to be crucial to regulating CO2 on millennial timescales, however the mechanisms by which the Pacific is ventilated are poorly understood, both in the modern, and under different climatic states

Excited to share a new paper led by PhD student Bruno Millet looking at the ventilation of the Pacific in both the modern and LGM using...

Excited to share a new paper led by PhD student Bruno Millet looking at the ventilation of the Pacific in both the modern and LGM using oxygen isotopes

https://link.springer.com/article/10.1007/s00382-023-06910-8

Deglaciation of northwestern Greenland during Marine Isotope Stage 11https://www.science.org/doi/10.1126/science.ade4248

Deglaciation of northwestern Greenland during Marine Isotope Stage 11

https://www.science.org/doi/10.1126/science.ade4248

60,000 people died of heat in europe last summer https://www.nature.com/articles/s41591-023-02419-z

60,000 people died of heat in europe last summer

https://www.nature.com/articles/s41591-023-02419-z

finally, we think this highlights the potential of planktic foraminiferal d18O to trace changes in broad-scale SST patterns, and the...

finally, we think this highlights the potential of planktic foraminiferal d18O to trace changes in broad-scale SST patterns, and the dynamics that underly these patterns - and can provide a way to test the dynamic response of climate models to different forcings

the compilation of Southern Ocean planktic d18O data is available on PANGAEA (https://doi.pangaea.de/10.1594/PANGAEA.932846) and the R code to perform the analysis is available on Github (https://github.com/willyrgray/SOd18O)

to investigate the mechanisms under pinning this coupling we performed wind shift experiments with a 1/4 degree global ocean-carbon model,...

to investigate the mechanisms under pinning this coupling we performed wind shift experiments with a 1/4 degree global ocean-carbon model, and find the deep ocean sequesters more carbon with equatorward shifted westerlies

overall our results support a link between the westerlies and atmospheric CO2. somewhat worryingly, it follows we could expect natural CO2 outgassing from the Southern Ocean to increase as the westerlies shift poleward under future global warming

we find the westerlies were displaced about 5 degrees equatorward during the LGM, and were about 25% weaker. None of the models in the...

we find the westerlies were displaced about 5 degrees equatorward during the LGM, and were about 25% weaker. None of the models in the PMIP3/4 ensemble simulate this magnitude of shift under LGM forcings.

we find a striking correspondence between the poleward shift in the westerlies over deglaciation and the rise in CO2 (see fig in first tweet). This tight correlation (R2=0.98!) affirms a coupling between the westerlies and atmospheric CO2 via Southern Ocean circulation/biogeochem

the SH westerlies are thought to play a key role in driving deep ocean circulation and carbon storage, but our understanding of their past...

the SH westerlies are thought to play a key role in driving deep ocean circulation and carbon storage, but our understanding of their past variability is limited as we have few methods to directly track the winds.

here, we use a basin-wide compilation of planktic foraminiferal d18O to track changes in the latitude of the steepest meridional gradient in SST in the Southern Ocean, and quantitively relate these changes back to shifts in the westerlies using an ensemble of climate models

hello! our paper reconstructing shifts in the Southern Hemisphere westerly winds over the last deglaciation is out!...

hello! our paper reconstructing shifts in the Southern Hemisphere westerly winds over the last deglaciation is out!

https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2023PA004666

https://beta.briefideas.org/The Journal of Brief ideas is my new favourite thing on the internet

https://beta.briefideas.org/

The Journal of Brief ideas is my new favourite thing on the internet