Assembling the Puzzle of Coparsite Polymorphism: Synthesis, Thermal Expansion, and Quantum Magnetism of α- and β-CuO(VO)Cl.

Two new dimorphic spin-1/2 quantum magnets, α- and β-CuO(VO)Cl, were synthesized via a chemical vapor transport method that emulates mineral formation in volcanic fumaroles. α-CuO(VO)Cl () is a pure vanadate analogue of the coparsite mineral characterized by [OCu] 1 single rods, whereas β-CuO(VO)Cl () adopts a new structure type with the [OCu] 2 layered topology. The thermal expansions of both and studied by high-temperature single-crystal X-ray diffraction are reported.

On the potential of glaciochemical analysis of Joinville Island firn core for the sea ice reconstruction around the northern Antarctic Peninsula.

The Antarctic Peninsula is undergoing rapid climate changes, impacting its surrounding marine ecosystem. At that site, sea ice plays a crucial role in this ecosystem by serving as a habitat for organisms and influencing primary productivity. Studying sea ice variability and primary productivity is essential for understanding environmental changes in Antarctica.

(CNH)[FeFe(SO)(HO)]: A Framework Iron Sulfate with a Mixed = 2 and = 5/2 Honeycomb Lattice.

A new guanidinium-templated hydrated iron sulfate, [CNH][FeFe(SO)(HO)] (), was prepared from strongly acidic aqueous solutions. Its crystal structure is comprised from FeO and FeO(HO) octahedra linked by sulfate bridges forming a [FeFe(SO)(HO)] 3 framework with a layer-by-layer ordering of ferric and ferrous cations. The structural topology of the framework is related to the anhydrous rhombohedral mikasaite Fe(SO).

Increased Amazon carbon emissions mainly from decline in law enforcement.

The Amazon forest carbon sink is declining, mainly as a result of land-use and climate change. Here we investigate how changes in law enforcement of environmental protection policies may have affected the Amazonian carbon balance between 2010 and 2018 compared with 2019 and 2020, based on atmospheric CO vertical profiles, deforestation and fire data, as well as infraction notices related to illegal deforestation. We estimate that Amazonia carbon emissions increased from a mean of 0.

Increase in the number of explosive low‒level cyclones around King George Island in the last three decades.

This paper documents an increase in the number of observed explosive cyclones (EC) at King George Island, South Shetland Islands, Antarctica, over the 1989‒2020 period. In ECs at 60o latitudes the surface atmospheric pressure drops ≥24 hPA in 24 hours. The annual EC frequency time series shows a significant positive trend of ~2.