This study focuses on geochemical research into humic acids and humification processes in lakes of West Antarctica, specifically King George Island and Marie Byrd Land. Humic acids were extracted from recent sediments of Antarctic lakes and analysed using high-precision laboratory methods. The experiments included examining the elemental composition and molecular structure of the humic acids. The results show that the organic matter in sediments of the studied lakes has undergone complete humification processes. However, the molecular structure of humic acids is characterized by a predominance of aliphatic fragments and a significant amount of polysaccharides, which is typical of humic substances in the cold climates of Arctic and Antarctic regions. Thus, the humic substances of Antarctic lakes were found to have a very low degree of maturity and were non-resistant to mineralization. These findings are valuable for understanding the full chain of organic matter transformation processes in Antarctic ecosystems and the global carbon cycle on Earth.

“Antarctic Ambassadorship” has emerged as an important concept in tourism, conservationist, and polar research communities. This article investigates tourists’ perceptions of “Antarctic Ambassadorship” through surveys and interviews conducted during and shortly after their travel to Antarctica, from 2015 to 2018. Interpretations of the term “Antarctic ambassador” varied widely but most hesitated to identify themselves this way. Tourists were not sure how to enact “Ambassadorship” or whether the actions they did take would “count.” Our findings suggest that the industry has great potential to promote Antarctic Ambassadorship by providing concrete ideas about what Ambassadorship might entail and offering tools for tourists to take concrete actions. We suggest a shift towards a focus on “Antarctic Civics” that would educate travellers about how Antarctica is governed and which institutions are responsible for its conservation, in order to empower tourists to engage in political advocacy in addition to personal lifestyle changes.

Antarctica is often cast as a last wilderness, untouched by humans and set aside for peace and science. Yet it also has a nuclear past that foreshadowed a shift in human interactions with the continent, away from development and towards protection. This paper examines the discourse around the installation and the dismantlement of PM-3A, the first and only large-scale nuclear reactor to have been used on the Antarctic continent. Affectionately known as “Nukey Poo,” the reactor was greeted with optimism by the USA and was seen as a catalyst for a more comfortable and technologically advanced future for the humans at McMurdo Station. This techno-optimism spurred visions of a resource-rich Antarctic future. When it became apparent a decade on that the reactor was too costly and had been leaking, the narration shifted to centre on environmental protection, resulting in the removal of a mountainside of gravel in the name of ecological restoration. The reactor is gone, but not forgotten – the site is designated as a Historic Site and Monument under the Antarctic Treaty System. Spanning from the Cold War to the Madrid Protocol era, the story of Nukey Poo provides a useful lens through which to track the evolution of attitudes towards Antarctica and to reflect on imagined Antarctic futures.

This spatial-scientometric study addresses research on Antarctic soils from 1958 to 2021. Through the review of 553 publications in the Web of Science and Scopus databases, geographical distribution, productivity, coauthorship and research topics were analysed. The results highlight the high productivity and interaction between researchers and institutions around the world, with a focus on microbiology, pollution, bioremediation, biogeochemistry and thermal and water monitoring of the soil and permafrost. This study provides insights into the importance of polar soils as global environmental indicators. The scientometric and spatial approach contributes to understanding the social and conceptual structure in this research area in addition to the development of the subject in time and space.

Cation ordering in amesite-2H2 from Antarctica has reduced the true symmetry from the ideal hexagonal space group P63 to triclinic P1. All crystals show 6-fold biaxial twin sectors on (001), and the twinned crystals produce an average diffraction symmetry that is hexagonal. Individual twin sectors cut from the larger aggregate have 2 V optic angles near 18°, slightly monoclinic unit-cell geometry, and triclinic diffraction symmetry. Structural refinement of an untwinned sector in subgroup symmetry shows nearly complete ordering of Si,Al in tetrahedral sites and of Mg, Al in octahedral sites.

In triclinic symmetry the two layers in the unit cell are no longer equivalent. Tetrahedra lying on the pseudo-63 screw axis are alternately Si-rich and Al-rich in adjacent layers. Of the three octahedral sites in each layer, one is smaller than the other two and is interpreted as Al-rich. The distribution of Al-rich and Mg-rich octahedra violates both the pseudo-3-fold rotation axis within each layer and the pseudo-63 screw axis that relates one layer to the next in the ideal space group. Local charge balance is achieved in adjacent layers by location of all tetrahedral and octahedral Al in lines parallel to X1 and spaced at intervals of b1/2. Similar charge balance patterns parallel to X2 and X3 are postulated to account for the sector twinning, which has been observed also in amesites from Chester, Massachusetts, USA, Saranovskoye, USSR, and Postmasburg, South Africa.

Secondary carbonate precipitates on the surface of clasts have rarely been reported from Antarctica. Here, we infer the origin, age and palaeo-environmental significance of the calcite crusts in the Untersee Oasis, East Antarctica. The distribution of calcite crusts, which are up to 1 mm thick, is limited to locations with residual snow patches, and they have some of the highest δ18O (up to +17.4‰ Vienna Standard Mean Ocean Water (VSMOW)) and δ13C (up to +14.6‰ Vienna Pee Dee Belemnite (VPDB)) compositions of any carbonate deposits in terrestrial polar environments. Their δ18O and δ13C values are substantially enriched with respect to the isotopic values expected from equilibrium precipitation from the δ18O and δ13CDIC (DIC = dissolved inorganic carbon) of snow meltwater. The formation of the calcite crusts is ascribed to the evaporation of residual snow meltwater and the low relative humidity and strong winds, favouring a kinetic isotope effect. The 14C age distribution of the calcite crusts (1550 cal yr bp to modern) provides a minimum age for ice retreat and drainage of the palaeo-lake in Aurkjosen Cirque. However, in this polar desert environment in which surface melting is limited, the calcite crusts require sufficient snow accumulation and air temperatures warm enough to generate meltwater, and their age distribution corresponds to the late Holocene warm-wet climate period.

In March 1912, Captain Robert Falcon Scott and his companions perished on their return journey from the South Pole. The Final Blizzard delivered a terminal blow. However, it was only a part of this story of endurance and tragedy. In December 1911, en route to the South Pole, the men had been tent-bound for 4 days due to an exceptionally warm, wet blizzard. This article compares the meteorological situation that the polar party encountered in December 1911 to a similar situation in the modern time and suggests a possible climatology behind the 1911 event.

Radiocarbon (14C) dating of sediment deposition around Antarctica is often challenging due to heterogeneity in sources and ages of organic carbon in the sediment. Chemical and thermochemical techniques have been used to separate organic carbon when microfossils are not present. These techniques generally improve on bulk sediment dates, but they necessitate assumptions about the age spectra of specific molecules or compound classes and about the chemical heterogeneity of thermochemical separations. To address this, the Rafter Radiocarbon Laboratory has established parallel ramped pyrolysis oxidation (RPO) and ramped pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS) systems to thermochemically separate distinct carbon fractions, diagnose the chemical composition of each fraction, and target suitable RPO fractions for radiocarbon dating. Three case studies of sediment taken from locations around Antarctica are presented to demonstrate the implementation of combined RPO-AMS and Py-GC-MS to provide more robust age determination in detrital sediment stratigraphy. These three depositional environments are good examples of analytical and interpretive challenges related to oceanographic conditions, carbon sources, and other factors. Using parallel RPO-AMS and Py-GC-MS analyses, we reduce the number of radiocarbon measurements required, minimize run times, provide context for unexpected 14C ages, and better support interpretations of radiocarbon measurements in the context of environmental reconstruction.

Advice from avian influenza experts suggests that there is a high risk that highly pathogenic avian influenza will arrive in the Southern Ocean during the austral summers.

The new terricolous lichen species Thamnolecania yunusii Halıcı, Güllü, Bölükbaşı & Kahraman, which is characterised by its cream to greyish brown granulose-crustose thallus without vegetative propagules, is described from Horseshoe Island in the South-West Antarctic Peninsula region. All Thamnolecania species are known only from the Antarctic. The only species of the genus with a crustose thallus is T. racovitzae, but it differs from T. yunusii by growing on rocks, having an effuse to subeffigurate thallus that is sometimes isidiate and with shorter and narrower ascospores (c. 15 × 3.5 µm vs. 15.5–19.5 × 3.5–5.5 µm). The nrITS, mtSSU and RPB1 gene regions of the new species were studied and the phylogenetic position of the species was shown to be in the same clade as Thamnolecania gerlachei, T. brialmontii and T. racovitzae, but occurs on a different branch from these species. As T. yunusii is an Antarctic endemic, like the other Thamnolecania species, and most of the morphological characters fit well with this genus, we describe this new species under the genus Thamnolecania.

We present the surface mass balance (SMB) dataset from Vostok Station's accumulation stake farms which provide the longest instrumental record of its kind obtained with a uniform technique in central Antarctica over the last 53 years. The snow build-up values at individual stakes demonstrate a strong random scatter related to the interaction of wind-driven snow with snow micro-relief. Because of this depositional noise, the signal-to-noise ratio (SNR) in individual SMB time series derived at single points (from stakes, snow pits or firn cores) is as low as 0.045. Averaging the data over the whole stake farm increases the SNR to 2.3 and thus allows us to investigate reliably the climatic variability of the SMB. Since 1970, the average snow accumulation rate at Vostok has been 22.5 ± 1.3 kg m−2 yr−1. Our data suggest an overall increase of the SMB during the observation period accompanied by a significant decadal variability. The main driver of this variability is local air temperature with an SMB temperature sensitivity of 2.4 ± 0.2 kg m−2 yr−1 K−1 (11 ± 2% K−1). A covariation between the Vostok SMB and the Southern Oscillation Index is also observed.