Source: AGU Advances Ocean tides push upstream along coastal rivers, in some cases reaching hundreds of kilometers...
Science
Source: Earth’s Future This is an authorized translation of an Eos article. 本文是Eos文章的授权翻译。 航天产业正在迅猛发展。未来几年，预计将有近 10,000 颗航天器被发射至近地轨道，用于全球监测、太空旅游以及提供互联网服务的卫星“巨型星座”等多种用途。 火箭发动机的尾气，以及失效卫星和火箭部件重返地球大气层时燃烧产生的物质，都会释放出一系列污染物。鉴于航天产业以往规模较小，这些化学物质长期以来被认为对气候影响不大。如今，该行业的快速增长将导致排放量激增，但科学家目前尚未完全掌握其对环境的具体影响。 Vliex 等人对 2022...
Want updates from a trusted source about how changes in science policy are impacting research and researchers?...
While New York pushed back a near-term climate goal, the Democratic governor touted the state’s solar deployment,...
A group of insurgent Democrats have won House primaries in recent weeks. They could have a major...
Trump unveiled the “Freedom Fuel Network” ahead of Independence Day, offering gasoline at up to 50 cents...
From geomorphology and marine ecosystems to satellite orbits and planetary motion, the subjects that Earth and space...
Source: Journal of Geophysical Research: Oceans Typhoons are becoming more frequent and more intense as a result...
A major landslide triggered by monsoon rainfall killed eight people this week. The failure occurred at the...
Research & Developments is a blog for brief updates that provide context for the flurry of news regarding...
Research & Developments is a blog for brief updates that provide context for the flurry of news regarding...
Source: AGU Advances Hillslopes in Arctic regions with frozen soils can host a suite of geometric patterns,...
A supermoon is reflected in the Fred C. Babcock/Cecil M. Webb Wildlife Management Area’s marsh, near Punta...
Resumed hostilities reversed a monthlong drop in fuel prices.
The move deepens what Democrats say is the president’s politicization of federal emergency management decisions.
Source: AGU Advances This is an authorized translation of an Eos article. 本文是Eos文章的授权翻译。 在大约46亿至35亿年前的冥古宙(Hadean eon)和太古宙(Archean eon)期间，小行星和微行星频繁轰击地球。由于如今保存下来的岩石中，年代超过40亿年的寥寥无几，我们对当时地球环境的了解十分有限。然而，来自月球的样本及其布满陨石坑的表面，为我们了解该时期的宇宙撞击频率提供了线索。 早期的小行星撞击导致了地球地壳的显著变化，而当时的地壳主要由玄武岩质岩石构成。撞击产生的冲击波使地壳破裂并增加了孔隙率，从而使流体和气体能够在岩石中穿行。既往研究表明，由此产生的热液系统——例如黄石国家公园周边的间歇泉群——为地球早期生命的起源与演化提供了适宜的环境。 Alexander等人研究了冥古宙和太古宙时期的地表撞击如何促使流体和气体在地壳环境中流动。研究人员利用iSALE冲击物理模拟程序构建了一系列撞击模拟，并调整了诸如玄武岩地壳厚度、地温梯度以及是否存在深达5公里海洋等参数。这些模拟详细展示了地表撞击如何影响地壳的渗透性。随后，他们结合关于古代撞击数据的模型，分析随着时间推移，反复撞击所产生的累积效应。 结果显示，在43亿年前，撞击可能极大地提高了地壳的渗透性，尤其是在地表以下8公里的范围内。通过模拟，研究人员推断，高渗透性区域的规模取决于撞击能量，而地温梯度和地壳岩石成分则影响了撞击后的破碎程度。这些多孔区域为早期地壳内的前生物化学反应提供了潜在的场所。 这项研究是对早期地球最外层因撞击而产生的渗透性的首次全面研究。其结果为评估撞击如何影响冥古宙和太古宙时期的热液循环及地球化学变化提供了新的框架，对理解地球早期生命起源与演化具有重要意义。...
Dozens of data centers are going up around the country without water permits or any way for...
Source: Journal of Geophysical Research: Machine Learning and Computation Raindrops form inside clouds when tiny particles of...
Editors’ Highlights are summaries of recent papers by AGU’s journal editors. Source: Journal of Geophysical Research: Biogeosciences...
A major landslide in China yesterday killed 21 forestry workers. Satellite imagery suggests that the slope showed...
