F. Alexander Haumann
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View article: Southern Ocean freshening stalls deep ocean CO2 release in a changing climate
Southern Ocean freshening stalls deep ocean CO2 release in a changing climate Open
The Southern Ocean mitigates global surface warming by taking up a large portion of the carbon released by human activities. While models suggest this carbon sink should weaken as climate change increases upwelling of carbon-rich deep wate…
View article: Large Regional Differences in Antarctic Ice Shelf Mass Loss from Southern Ocean Warming and Meltwater Feedbacks
Large Regional Differences in Antarctic Ice Shelf Mass Loss from Southern Ocean Warming and Meltwater Feedbacks Open
The increasing release of Antarctic meltwater represents one of the most profound, yet uncertain, consequences of global climate change. The absence of interactive ice sheets in state-of-the-art climate models prevents the direct calculati…
View article: Wind‐Driven Iron Supply by Ekman Buoyancy Flux Enhances Phytoplankton Bloom in the Antarctic Circumpolar Current
Wind‐Driven Iron Supply by Ekman Buoyancy Flux Enhances Phytoplankton Bloom in the Antarctic Circumpolar Current Open
The Southern Ocean today is a globally relevant sink for atmospheric carbon dioxide (), where the biological uptake of carbon through primary productivity is largely controlled by widespread iron (Fe) limitation. We analyze observations fr…
View article: Rising surface salinity and declining sea ice: A new Southern Ocean state revealed by satellites
Rising surface salinity and declining sea ice: A new Southern Ocean state revealed by satellites Open
For decades, the surface of the polar Southern Ocean (south of 50°S) has been freshening—an expected response to a warming climate. This freshening enhanced upper-ocean stratification, reducing the upward transport of subsurface heat and p…
View article: Impact of glacial meltwater on phytoplankton biomass along the Western Antarctic Peninsula
Impact of glacial meltwater on phytoplankton biomass along the Western Antarctic Peninsula Open
The Western Antarctic Peninsula is undergoing rapid environmental change. Regional warming is causing increased glacial meltwater discharge, but the ecological impact of this meltwater over large spatiotemporal scales is not well understoo…
View article: Southern Ocean freshening stalls deep ocean CO2 release in a changing climate
Southern Ocean freshening stalls deep ocean CO2 release in a changing climate Open
The Southern Ocean critically mitigates global surface warming by taking up a large portion of the carbon released to the climate system by human activities. While models suggest this carbon sink should weaken with human-induced climate ch…
View article: Navigating the ocean carbon sink: insights from The Ocean Race
Navigating the ocean carbon sink: insights from The Ocean Race Open
The ocean critically mitigated global surface warming by taking up a large portion of the additional carbon released to the climate system by human activities. The strength of this carbon sink depends on ocean dynamics and its interaction …
View article: Leveraging robotics, sensor innovation and data strategies to address the triple planetary ocean crisis: A framework of essential ocean variables
Leveraging robotics, sensor innovation and data strategies to address the triple planetary ocean crisis: A framework of essential ocean variables Open
The United Nations Framework Convention on Climate Change (UNFCCC) has identified climate change, pollution, and biodiversity loss as the most critical and interconnected challenges facing humanity today, collectively known as the "triple …
View article: Wind-triggered Antarctic sea ice decline preconditioned by thinning Winter Water
Wind-triggered Antarctic sea ice decline preconditioned by thinning Winter Water Open
Between 2015 and 2017, Antarctic sea ice underwent a drastic change, transitioning from a period of record high sea ice area to a period of record low sea ice area. While both an intensified atmospheric circulation and warmer ocean tempera…
View article: Antarctica InSync: internationally coordinated, circumpolar, and year-round research in the Southern Ocean
Antarctica InSync: internationally coordinated, circumpolar, and year-round research in the Southern Ocean Open
Antarctica and the Southern Ocean play a crucial role in the Earth’s climate system and for all life on our planet, and are rapidly changing due to human activities. International research in this part of the world is particularly challeng…
View article: The influence of freshwater input in the SOFIA simulations on the upper cell of the global MOC
The influence of freshwater input in the SOFIA simulations on the upper cell of the global MOC Open
Due to rising global air and sea temperatures, the Antarctic ice shelves and sheet is expected to melt more rapidly in the future, resulting in an increasing freshwater input into the Southern Ocean. The additional freshwater input could a…
View article: Thinning of Antarctic Winter Water preconditions recent storm-triggered Antarctic sea ice decline
Thinning of Antarctic Winter Water preconditions recent storm-triggered Antarctic sea ice decline Open
In winter 2015, Antarctic sea ice underwent a drastic change, transitioning from a period of record high sea ice coverage to a period of record low sea ice coverage. While both an intensified atmospheric circulation and warmer ocean temper…
View article: Carbon Exchange and Ocean Ventilation along the East Antarctic Margin
Carbon Exchange and Ocean Ventilation along the East Antarctic Margin Open
The Southern Ocean (SO) plays a crucial role in regulating the Earth’s climate by absorbing atmospheric carbon and storing it in the deep ocean. (Brovkin et al., 2012). Past studies reported a reduction in this uptake capacity over t…
View article: Southern Ocean Sea Ice-Ocean Interactions in a Simple Box Model
Southern Ocean Sea Ice-Ocean Interactions in a Simple Box Model Open
Subsurface warming has been identified as a likely causal factor for the sustained low Southern Ocean sea ice extent in recent years. Subsurface-to-surface heat transport is impacted by the water mass structure of the water column and the …
View article: Shallow open-ocean convection in the Weddell Sea: A case study using observations and modelling techniques
Shallow open-ocean convection in the Weddell Sea: A case study using observations and modelling techniques Open
Water mass transformations in the Southern Ocean serve as a lynchpin in the global overturning circulation. Among them, the transformation of Circumpolar Deep Water into Antarctic Winter and Surface Water is uniquely critical for the expor…
View article: Identifying Changes in Ice-Ocean-Atmosphere Fluxes in Antarctic Bottom Water
Identifying Changes in Ice-Ocean-Atmosphere Fluxes in Antarctic Bottom Water Open
The Southern Ocean plays a crucial role in global climate regulation through its influence on the oceanic and atmospheric circulation. Due to the very cold temperatures in the polar Southern Ocean, salinity exerts a fundamental control on …
View article: Impact of additional freshwater around Antarctica on the Southern Ocean carbon cycle : an inter-model comparison
Impact of additional freshwater around Antarctica on the Southern Ocean carbon cycle : an inter-model comparison Open
The ongoing increase of global mean temperature, caused by anthropogenic CO2 emissions, will most likely lead to enhanced melting and calving of Antarctic ice shelves in the coming decades. As a consequence, the freshwater input into the S…
View article: Changes in salinity driven stratification and impacts on the deep-water CO2 ventilation in the Southern Ocean
Changes in salinity driven stratification and impacts on the deep-water CO2 ventilation in the Southern Ocean Open
The Southern Ocean considerably influences the global climate by exchanging heat and carbon between the deep ocean and the surface. Historically, it mitigated surface warming by absorbing 70% of excess heat and over 10% of human-…
View article: Investigating upper ocean salinity changes over the past three decades in the Indian sector of the Southern Ocean
Investigating upper ocean salinity changes over the past three decades in the Indian sector of the Southern Ocean Open
The Southern Ocean is undergoing rapid transformations, marked by significant regional shifts in salinity that carry widespread and irreversible consequences. While the most noticeable changes are observed in the upper ocean, changes in de…
View article: Sea ice and climate impacts from Antarctic ice-mass loss in the SOFIA multi-model ensemble
Sea ice and climate impacts from Antarctic ice-mass loss in the SOFIA multi-model ensemble Open
We assess the response of Antarctic sea ice, the Southern Ocean, and global climate to mass loss from the Antarctic continent in a new multi-model ensemble. Antarctic ice-mass loss from ice sheets and ice shelves is increasing and is proje…
View article: Unprecedented changes in the Southern Ocean detected by satellites
Unprecedented changes in the Southern Ocean detected by satellites Open
The Southern Ocean has experienced unprecedented changes since 2016. Most notably are 1) a reduction in sea ice cover and 2) the appearance of offshore polynyas not seen since the 1970s. Several hypotheses have been put forward to explain …
View article: The Southern Ocean Freshwater Input from Antarctica (SOFIA) Initiative: scientific objectives and experimental design
The Southern Ocean Freshwater Input from Antarctica (SOFIA) Initiative: scientific objectives and experimental design Open
As the climate warms, the grounded ice sheet and floating ice shelves surrounding Antarctica are melting and releasing additional freshwater into the Southern Ocean. Nonetheless, almost all existing coupled climate models have fixed ice sh…
View article: Observing Antarctic Bottom Water in the Southern Ocean
Observing Antarctic Bottom Water in the Southern Ocean Open
Dense, cold waters formed on Antarctic continental shelves descend along the Antarctic continental margin, where they mix with other Southern Ocean waters to form Antarctic Bottom Water (AABW). AABW then spreads into the deepest parts of a…
View article: Potential Predictability of the Spring Bloom in the Southern Ocean Sea Ice Zone
Potential Predictability of the Spring Bloom in the Southern Ocean Sea Ice Zone Open
Every austral spring when Antarctic sea ice melts, favorable growing conditions lead to an intense phytoplankton bloom, which supports much of the local marine ecosystem. Recent studies have found that Antarctic sea ice is predictable seve…
View article: Decadal Reorganization of Subantarctic Mode Water
Decadal Reorganization of Subantarctic Mode Water Open
Subantarctic Mode Water (SAMW) is one of the most important water masses globally in taking up anthropogenic heat and carbon dioxide. However, its long‐term changes in response to varying climatic conditions are not well understood. We use…
View article: Potential Predictability of the Spring Bloom in the Southern Ocean Sea Ice Zone
Potential Predictability of the Spring Bloom in the Southern Ocean Sea Ice Zone Open
Every austral spring when Antarctic sea ice melts, favorable growing conditions lead to an intense phytoplankton bloom, which supports much of the local marine ecosystem. Recent studies have found that Antarctic sea ice is predictable seve…
View article: Isotopic evidence for an intensified hydrological cycle in the Indian sector of the Southern Ocean
Isotopic evidence for an intensified hydrological cycle in the Indian sector of the Southern Ocean Open
The hydrological cycle is expected to intensify in a warming climate. However, observational evidence of such changes in the Southern Ocean is difficult to obtain due to sparse measurements and a complex superposition of changes in precipi…
View article: Tracing the impacts of recent rapid sea ice changes and the A68 megaberg on the surface freshwater balance of the Weddell and Scotia Seas
Tracing the impacts of recent rapid sea ice changes and the A68 megaberg on the surface freshwater balance of the Weddell and Scotia Seas Open
The Southern Ocean upper-layer freshwater balance exerts a global climatic influence by modulating density stratification and biological productivity, and hence the exchange of heat and carbon between the atmosphere and the ocean interior.…