Orbital forcing of ice sheets during snowball Earth [PDF]
Nature Communications, 2021 Reconciling the Snowball Earth hypothesis with sedimentological cyclicity has been a persistent challenge. A new cyclostratigraphic climate record for a Cryogenian banded iron formation in Australia provides evidence for orbital forcing of ice sheet ...
Ross N. Mitchell +8 more
doaj +2 more sources
Active methanogenesis during the melting of Marinoan snowball Earth [PDF]
Nature Communications, 2021 The deglaciation of Marinoan snowball Earth (~635 Myr ago) has been associated with potentially extensive CH4 emissions in relation to transient marine euxinia. Here, the authors find that active methanogenesis occurred during the termination of Marinoan
Zhouqiao Zhao +9 more
doaj +2 more sources
Extremely cold ocean temperatures in iron formation brine pools of snowball Earth [PDF]
Nature CommunicationsFor the severe low-latitude “snowball Earth” glaciations, glacial deposits occurring on all continents is well-established. However, cold, salty, ice-covered oceans—a salient prediction of snowball Earth—is difficult to establish geologically.
Kai Lu +4 more
doaj +2 more sources
Moderate greenhouse climate and rapid carbonate formation after Marinoan snowball Earth [PDF]
Nature CommunicationsWhen the Marinoan snowball Earth deglaciated in response to high atmospheric carbon dioxide (CO2) concentrations, the planet warmed rapidly. It is commonly hypothesized that the ensuing supergreenhouse climate then declined slowly over hundreds of ...
Lennart Ramme +2 more
doaj +2 more sources
Marine oxygen production and open water supported an active nitrogen cycle during the Marinoan Snowball Earth [PDF]
Nature Communications, 2017 Snowball Earth glaciations were some of the most extreme climate events in Earth history, and are temporally linked to major biogeochemical changes. Here, using geochemical proxies, the authors show that during the Marinoan glaciation, there was likely ...
Benjamin W. Johnson +2 more
doaj +2 more sources
The radiative feedback continuum from Snowball Earth to an ice-free hothouse [PDF]
Nature CommunicationsPaleoclimate records have been used to estimate the modern equilibrium climate sensitivity. However, this requires understanding how the feedbacks governing the climate response vary with the climate itself.
Ian Eisenman, Kyle C. Armour
doaj +2 more sources
Biosignatures of diverse eukaryotic life from a Snowball Earth analogue environment in Antarctica [PDF]
Nature CommunicationsThe ephemeral, supraglacial meltwater ponds of the McMurdo Ice Shelf’s undulating ice serve as analogues for refugia where eukaryotic organisms could have thrived during the Cryogenian period.
Fatima Husain +5 more
doaj +2 more sources
Elevated CO2 degassing rates prevented the return of Snowball Earth during the Phanerozoic [PDF]
Nature Communications, 2017 Despite dramatic changes in carbon sinks, severe Snowball Earth glaciations have not occurred since the Cryogenian. Here, via the measurement of global subduction zone lengths and carbon cycle modelling, the authors show that a two fold increase in ...
Benjamin J. W. Mills +4 more
doaj +2 more sources
Bisnorgammacerane traces predatory pressure and the persistent rise of algal ecosystems after Snowball Earth [PDF]
Nature Communications, 2019 It remains unclear when and why the world’s oceans, once largely occupied by bacteria, became dominated by photosynthetic algae. Here, using fossil lipids in million year old rocks, the authors show that predation after the Snowball Earth glaciations ...
Lennart M. van Maldegem +18 more
doaj +2 more sources
Multiple sulfur isotope evidence for massive oceanic sulfate depletion in the aftermath of Snowball Earth [PDF]
Nature Communications, 2016 Large positive sulphur isotope excursions, recorded in the wake of the Marinoan glaciation have previously been interpreted assuming stable ocean sulphate concentrations.
Pierre Sansjofre +5 more
doaj +2 more sources