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Welcome to my website! I am a Research Group Leader studying the impact of changing sea ice, freshwater fluxes, and ocean stratification on the ability of the Southern Ocean to take up and release carbon-dioxide and heat. Gaining a robust understanding of these processes and the related uncertainties is directly relevant to constraining future global climate change, allowable carbon-dioxide emissions for a given temperature target, and related sea level rise.
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News
January 2023: Opportunity to join our newly established research group: PostDoc position in Oceanography.
January 2023: Thrilled to start my new position as Research Group Leader at AWI.
January 2023: Launching the new ERC project VERTical EXchange in the Southern Ocean | VERTEXSO.
November 2022: Presenting at the Seminar Ocean, Ice and Atmosphere at the University of Bremen on Changes in the coupled Southern Ocean ice-ocean system.
September 2022: Very excited and honored that my ERC Starting Grant project was funded: VERTical EXchange in the Southern Ocean | VERTEXSO (starting January 2023).
September 2022: Keynote speaker on "Sources & Sinks" of freshwater in the Southern Ocean at the NORP-SORP workshop on polar freshwater: "Sources, Pathways and ImpaCts of frEsh water in northern and soUthern Polar oceans and seas (SPICE UP)".
July 2022: What happens if climate change alters the ocean circulation? Our new paper in Global Biogeochemical Cycles: "The Deep Ocean's Carbon Exhaust", implies that a change in ocean circulation could critically change the release of CO2 that has been locked up in the deep ocean for thousands of years. It shows how ocean circulation brings this carbon that naturally accumulates in the deep ocean back to the surface in the Southern Ocean from where it leaks to the atmosphere.
⤷ In the news: Research spotlight in Eos by AGU
⤷ In the news: Research spotlight in Eos by AGU
June 2022: New publication by Prend et al. in Global Biogeochemical Cycles: "Indo-Pacific Sector Dominates Southern Ocean Carbon Outgassing".
June 2022: New publication by Reverdin et al. in Earth System Science Data on the "The CISE-LOCEAN seawater isotopic database (1998–2021)".
May 2022:
Convening and chairing the hybrid
Southern Ocean session at EGU 2022.
May 2022:
Presenting our work on "Decadal Oscillations in Southern Ocean Air-Sea Exchange Arises from Zonal Asymmetries in the Atmospheric Circulation
at the Royal Society Meeting and the EGU General Assembly 2022.
March 2022: Very excited to join the Southern Ocean Region Panel (SORP), which jointly organized through the World Climate Research Programme's Climate and Ocean: Variability, Predictability and Change (CLIVAR) and Climate and Cryosphere (CliC) projects, as well as the Scientific Committee on Antarctic Research (SCAR) program. I am looking forward to serving our community as part of this panel in the coming years.
March 2022:
Joining the "Southern Ocean Freshwater release model experiments Initiative (SOFIA)" that aims to improve our understanding of the simulated response to Antarctic freshwater input.
February 2022:
Presenting at the
virtual Ocean Sciences Meeting 2022 on "Decadal Oscillations in Southern Ocean Air-Sea Exchange Arising from Zonal Asymmetries in the Atmospheric Circulation".
February 2022:
New project launched on
Drivers and Effects of Fluctuations in sea Ice in the ANTarctic (DEFIANT) in which I am an international collaborator.
November 2021: New publication by Landwehr et al. in Earth System Dynamics on the "Exploring the coupled ocean and atmosphere system with a data science approach applied to observations from the Antarctic Circumnavigation Expedition".
July 2021: Excited to be an invited keynote speaker at the ORCHESTRA annual meeting to talk about the "Southern Ocean freshwater flux balance and its isotopic constraints".
July 2021: Interview with the Science Media Center Germany on "Die Antarktis im Klimawandel" / The Antarctic in times of climate change (German only).
July 2021: New publication by Bushuk et al. in Journal of Climate on the "Seasonal Prediction and Predictability of Regional Antarctic Sea Ice".
April 2021:
Presenting at the
virtual EGU21 General Assembly on "Supercooled Southern Ocean Waters".
March 2021: New publication by Akhoudas et al. in Scientific Reports on the "Ventilation of the abyss in the Atlantic sector of the Southern Ocean".
epdf.
December 2020:
Presenting at the
virtual AGU Fall Meeting 2020 on "Supercool Southern Ocean Waters from Sinking Plumes and Ice-Shelf Melting".
December 2020:
Presenting at TUM and GEOMAR in seminars on
"Changing sea ice in the Southern Ocean and its importance for the global climate system".
November 2020: New publication by Silvano et al. in Nature Geoscience on the "Recent recovery of Antarctic Bottom Water formation in the Ross Sea driven by climate anomalies".
Full-access (read only).
October 2020:
Presenting at the
virtual European Polar Science Week on the "Climatic importance of Southern Ocean salinity: Changes, challenges, and opportunities".
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October 2020: New publication in GRL on "Supercooled Southern Ocean Waters".
⤷ Research highlight by Nature ⤷ Podcast by Nature (minute 24:00) |
Credit: Haumann et al. (2020), GRL, doi:10.1029/2020GL090242.
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July 2020: Presenting in the NASA GISS Sea Level Rise Seminar Series on "Recent changes in the southern high-latitude freshwater flux balance and their impact on Southern Ocean hydrography". Link
May 2020: New publication by Bracegirdle et al. in Atmospheric Science Letters on the "Twenty first century changes in Antarctic and Southern Ocean surface climate in CMIP6".
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May 2020: New publication in AGU Advances on the "Sea-ice induced Southern Ocean subsurface warming and surface cooling in a warming climate".
⤷ EOS Editors’ Highlights ⤷ ETH News: English, Deutsch ⤷ EGU2020 presentaion: Abstract, presentation |
Credit: Haumann et al. (2020), AGU Advances, doi:10.1029/2019AV000132.
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May 2020:
Join our first ever online EGU2020 Southern Ocean session:
Program.
February 2020:
Presenting at the
"2020 Ocean Sciences Meeting".
February 2020:
Attending the
UN Decade of Ocean Science
1st Southern Ocean Regional Workshop.
December 2019:
Giving an invited talk at the AGU Fall Meeting on
"A Major Shift in the Southern Ocean Climate System and the Role of Sea Ice".
November 2019:
Excited to join the
IAPSO ECS committee to help represent early career scientists' interests in the community.
November 2019:
Attending the
ACE DATA/ASAID workshop.
July 2019:
Start of second phase of SNSF funded Postdoc fellowship on
"The role of Southern Ocean stratification in future ocean CO2 and heat uptake".
July 2019: Presenting at the 27th IUGG General Assembly 2019 on
A major shift in the Southern Ocean surface climate.
July 2019: Presenting at the
ORCHESTRA annual meeting at PML in Plymouth.
June 2019: Invited talk at the
SCAR AntClim21 workshop on 21st century projections and predictions for Antarctica and the Southern Ocean at British Antarctic Survey in Cambridge.
May 2019: Meeting of the
ISSI Team on Antarctic sea ice at the International Space Science Institute in Bern.
May 2019: Presenting at the
SOCCOM annual meeting at Princeton University.
March 2019: New publication by Hasenfratz et al. in Science on the "The residence time of Southern Ocean surface waters and the 100,000-year ice age cycle".
⤷ Perspective: The southern amplifier
⤷ Press release:
Deutsch,
English
March 2019: I am excited to join the
BAS Honorary Researcher scheme.
Dec. 2018: Presenting at the AGU Fall Meeting 2018 on
A Previously Unrecorded Anomaly in the Southern Ocean Climate System.
Dec. 2018: Visiting McGill and presenting at the departemental seminar on
Sea-ice induced Southern Ocean surface cooling in a warming climate.
Nov. 2018: New publication by Nissen et al. in Biogeosciences on the "Factors controlling coccolithophore biogeography in the Southern Ocean".
Nov. 2018: Presenting at the ESA Ocean Salinity Science Conference on
Southern Ocean freshwater sources inferred from oxygen isotope data.
June 2018:
Awarded the
Prix de Quervain for my doctoral thesis
(link to
thesis). Thank you Nicolas Gruber, Matthias Münnich, ETH Zurich, and the Swiss Committee on Polar
and High Altitude Research!
June 2018: Meeting of the
ISSI Team on Antarctic sea ice at the International Space Science Institute in Bern.
June 2018: Presenting at POLAR2018 on
Southern Ocean freshwater sources inferred from oxygen isotope data. Thanks to NSF for the travel support.
April 2018: Talking about the role of the Southern Ocean in the climate system at the
Carbon Mitigation Initiative’s 17th Annual Meeting.
April 2018: Check-out our
Southern Ocean session at EGU 2018.
March 2018: New publication by Schlosser et al. in The Cryosphere on the "Atmospheric influences on the anomalous 2016 Antarctic sea ice decay".
Feb. 2018: Presenting at OSM 2018 on
Sea-ice induced changes in Southern Ocean hydrography.
Nov. 2017:
Awarded
ETH Medal for Outstanding Doctoral theses
(link to
thesis).
Oct. 2017:
Start of new SNSF funded Postdoc fellowship on
"The role of Southern Ocean stratification in future ocean CO2 and heat uptake".
Sept. 2017:
Visiting Bern University (CEP). Seminar on
"Southern Ocean response to recent changes in surface freshwater fluxes".
May 2017:
Visiting Princeton University and GFDL/NOAA. Seminar on
"Southern Ocean response to recent changes in surface freshwater fluxes".
Apr. 2017:
Presenting at EGU 2017 on
why the Southern Ocean has been cooling over recent decades.
Feb.-Mar. 2017: Participating in ACE expedition.
⤷ ETH Zukunftsblog
(Deutsch,
English)
⤷ SRF Interview (german only)
⤷ Video Leg 3
Nov. 2016:
PhD defense on the "Southern Ocean response to recent changes in surface freshwater fluxes".
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Sept. 2016: New publication in Nature on the "Sea-ice transport driving Southern Ocean salinity and its recent trends".
⤷ Full-access (read only) ⤷ Nature News & Views by T. Maksym ⤷ ETH News: English, Deutsch ⤷ C2SM News |
Credit: Haumann et al., Nature, doi:10.1038/nature19101.
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Feb. 2016: Presenting at OSM 2016 on "Strengthening of the Southern Ocean Carbon Sink through Recent Changes in Freshwater Forcing".
Jan. 2016: Seminar at Alfred Wegener Institute on "Causes and effects of recent changes in Southern Ocean ice-ocean freshwater fluxes".
Jan. 2016: Presenting at the workshop on "Antarctic Sea Ice Variability in the Southern Climate-Ocean System".
Sept. 2015: New publication in Science on the "The reinvigoration of the Southern Ocean carbon sink".
June 2015: Presentation at IUGG 2015 on "Cryospheric drivers of changes in Southern Ocean stratification and carbon uptake".
April 2015: Seminar at British Antarctic Survey on "Causes and effects of recent changes in Antarctic sea-ice transport".
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Dec. 2014: New publication in GRL on the "Anthropogenic influence on recent circulation-driven Antarctic sea-ice changes".
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Credit: Jacques Descloitres, MODIS Land Rapid Response Team, NASA/GSFC.
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Animations
Setting the Southern Ocean in motion: An illustration of the surface currents in the Southern Ocean with the high-resolution ocean model ROMS at 1/8° horizontal resolution. Credit: F. Alexander Haumann, ETH Zurich.
Air-sea difference in pCO2 over the Southern Ocean: A strong oversaturation is visible in winter along the sea-ice edge (grey) when deep carbon-rich waters mix into the surface layer. Blue: undersaturation of the surface ocean with respect to the atmosphere; red: oversaturation. Data stems from the regional ocean model ROMS-BEC that is forced with a climatological surface forcing between 1979 and 2013. Credit: F. Alexander Haumann, ETH Zurich.
Seasonal cycle of the Southern Ocean sea surface salinity: Along the sea-ice edge (grey) a strong decrease in salinity occurs seasonally when the ice melts. Blue: salinity below 34.5 g/kg; red: above 34.5 g/kg. Data stems from the regional ocean model ROMS that is forced with a climatological surface forcing between 1979 and 2013. Credit: F. Alexander Haumann, ETH Zurich.