Major excursions in sulfur isotopes linked to permafrost change in Eurasia during the last 50,000 years [0.03%]
过去五万年欧亚大陆硫同位素变化与永久冻土带变动的关系
Rhiannon E Stevens,Hazel Reade,Kerry L Sayle et al.
Rhiannon E Stevens et al.
We identify a major sulfur isotope excursion in Eurasian faunal bone collagen from the last 50,000 years, here termed the Late Pleniglacial Sulfur Excursion. Our analysis suggests this is linked to changing permafrost conditions, presenting...
Widespread underestimation of rain-induced soil carbon emissions from global drylands [0.03%]
全球干地区土壤碳排放量或被普遍低估
Ngoc B Nguyen,Mirco Migliavacca,Maoya Bassiouni et al.
Ngoc B Nguyen et al.
Dryland carbon fluxes, particularly those driven by ecosystem respiration, are highly sensitive to water availability and rain pulses. However, the magnitude of rain-induced carbon emissions remains unclear globally. Here we quantify the im...
T J Zega,T J McCoy,S S Russell et al.
T J Zega et al.
Samples of asteroid (101955) Bennu delivered by the OSIRIS-REx mission offer the opportunity to study pristine planetary materials unchanged by exposure to the terrestrial environment. Here we use a combination of X-ray diffraction and vari...
Coastal methane emissions driven by aerotolerant methanogens using seaweed and seagrass metabolites [0.03%]
海岸甲烷排放受利用海藻和海草代谢物的耐气态甲烷原菌驱动
N Hall,W W Wong,R Lappan et al.
N Hall et al.
Methanogenesis is thought to be limited to strictly anoxic environments. While oxygenated oceans are a known methane source, it is argued that methane production is driven by methylphosphonate-degrading bacteria and potentially other source...
L P Keller,M S Thompson,L B Seifert et al.
L P Keller et al.
The OSIRIS-REx mission deployed contact pad samplers to collect regolith from the uppermost surface of the asteroid Bennu that was exposed to the space environment. Space weathering processes, dominated by micrometeoroid impacts and solar i...
Outburst of a subglacial flood from the surface of the Greenland Ice Sheet [0.03%]
冰川下的洪水从格林兰冰盖表面喷发而出
Jade S Bowling,Malcolm McMillan,Amber A Leeson et al.
Jade S Bowling et al.
As Earth's climate warms, surface melting of the Greenland Ice Sheet has intensified, increasing rates of sea-level rise. Observations and theory indicate that meltwater generated at the ice sheet surface can drain to its bed, where it flow...
Extensive fluvial surfaces at the East Antarctic margin have modulated ice-sheet evolution [0.03%]
东 Antar 托冰盖演化中的大型河流表面的调控作用
Guy J G Paxman,Stewart S R Jamieson,Neil Ross et al.
Guy J G Paxman et al.
Antarctic bed topography influences how the overlying ice sheet responds to climate change and provides a record of long-term glacial history. However, knowledge of the processes that governed the development of the landscape before glacial...
Daniel J Ford,Jamie D Shutler,Javier Blanco-Sacristán et al.
Daniel J Ford et al.
The ocean annually absorbs about a quarter of all anthropogenic carbon dioxide (CO2) emissions. Global estimates of air-sea CO2 fluxes are typically based on bulk measurements of CO2 in air and seawater and neglect the effects of vertical t...
Mantle upwelling at Afar triple junction shaped by overriding plate dynamics [0.03%]
阿拉伯厄立特里亚阿法尔三联点地幔柱受板块俯冲影响发生上涌杂乱分布
Emma J Watts,Rhiannon Rees,Philip Jonathan et al.
Emma J Watts et al.
Mantle upwellings drive large-scale surface volcanism and facilitate continental breakup and ocean basin formation. However, the spatial characteristics and internal composition of these upwellings alongside how they are modified by plate t...
Bridgmanite's ferric iron content determined Earth's oxidation state [0.03%]
桥玄武岩中铁(III)含量决定了地球的状态氧化反应
Fei Wang,Lin Wang,Hongzhan Fei et al.
Fei Wang et al.
Bridgmanite, a magnesium-rich silicate perovskite, is the most prevalent mineral in Earth's lower mantle and contains substantial quantities of ferric (oxidized) iron, even in equilibrium with iron metal. Mixing of oxygen-rich material from...