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We analyse seismic time series collected during experimental campaigns in the area of the David Glacier, Victoria Land, Antarctica, between 2003 and 2016. We observe hundreds of repeating seismic events, characterized by highly correlated waveforms (cross-correlation > 0.95), which mainly occur in the grounding zone, i.e. the region where the ice transitions from grounded ice sheet to freely floating ice shelf. The joint analysis of seismic events and observed local tidal measurements suggests that seismicity is not only triggered by a regular, periodic driver such as the ocean tides but also more likely by transient pulses. We consider potential environmental processes and their impact on the coupling between the glacier flow and the bedrock brittle failure. Among the environmental variables examined, our findings suggest that clustered and repeated seismic events may be related to transient episodes of ice-mass discharge correlated to a change in the subglacial hydrographic system that originates upstream of the glacier, lubricating the interface with the bedrock. This hypothesis is supported by the gravity variation observations provided by the GRACE satellite mission, which observed mass variations during periods characterized by seismic clustering.

A translation is presented of an early formulation by Louis Rendu of the ideas later expanded in his 1841 Théorie des glaciers de Savoie, which described the movement of glaciers in terms of flowing ice. The reputation of James Forbes suffered, at least temporarily, from the accusation that he had deprived Rendu of due credit for this discovery. Although Rendu played no part in the disagreement, subsequent discussion of his scientific work has continued to view it in the context of this dispute, and concentrated on a single monograph. Rendu's earlier discussion of glaciers in his monograph about the geology of Savoy, in which he summarised his argument, but without the supporting evidence included in the latter work, was apparently overlooked even by his supporters.

Nutt led the team that made the first measurements of the composition of ancient air in Greenland ice in the 1950s, thus triggering the modern study of climate change in the polar regions. His team also measured the age of the Greenland ice, moved their sampling base from icebergs to ice tunnels at Thule, Greenland, and began the ice drilling methods that eventually led to retrieving complete ice cores to bedrock in Greenland and Antarctica. By now, these cores have reached back 110 000 years in Greenland and 740 000 years in Antarctica. Analysis of trapped air in ice began in 1954 with the Norwegian physiologist Per F. Scholander, who worked with Greenland icebergs off the Labrador coast on board the oceanographic research schooner Blue Dolphin, of which Nutt was master, expedition leader, and chief scientist. One day while looking over the rail, Scholander asked why the glacial ice was fizzing. From his wide Arctic experience, Nutt told him that it was air that had been locked in under high pressure during the transition from glacial snow to ice and was now being released. \"Put it in your Scotch, and you'll have instant iced Scotch and soda,\" he said. A contemporary photo shows him collecting a sample of fresh glacier ice by breaking off a piece of a handsome iceberg with a rifle shot fired from the deck. In 1946 Nutt was released from active duty to the Naval Reserve with the rank of Commander and became attached to the Geography Department at Dartmouth College. In 1948, he acquired the schooner Blue Dolphin, refitted it for Arctic oceanographic research, and from 1949 to 1952 and again in 1954, surveyed the fjords and estuaries of Labrador. Dartmouth professor Elmer Harp Jr. joined the 1949 expedition as archaeologist and discovered evidence of the 4500-3300-year-old Maritime Archaic culture in Port au Choix, Newfoundland. With colleagues Nutt and Trevor Lloyd, Harp helped attract the Arctic explorer Vilhjalmur Stefansson, with his library of Arctic writings, to Dartmouth.

I analyze, through the work of the Irish physicist John Tyndall (1820–1893), the close relationship formed in the mid-nineteenth century between advances in the physical sciences and the rise of mountaineering as a sport. Along with groundbreaking experimental research in the physical sciences, Tyndall worked throughout his career to define and popularize the study of physics. He also was a pioneering mountaineer during the golden age of mountaineering. As he practiced his science, from rock quarries to the study of the blue sky, Tyndall’s interests in the fundamental forces of Nature brought him to the summits of mountains. His sojourns to the mountains, in turn, affected the manner in which he approached his researches. His science and mountaineering were tellingly mixed, and worked in unison to shape public perceptions of what physicists did during a period of increasing specialization and popularization of the field.

These United States: America`s first cash crop. Becoming a TV commercial icon. Adam Scott on \"Severance\": \"I knew that I would have to give all of myself to it in order to pull it off.\" Laufey on creating her own sound. Capturing the melting of glaciers, with data and art. Rashid Johnson on art as a source of potential joy. A pilgrimage to the desk with the greatest view. A robotics activist`s remarkable crusade. The Summit: Trump`s diplomatic gambit, and Putin`s prize.

This article takes a look at the multiple purposes science informational books can serve in the classroom. The books featured are well written with creative visuals that engage readers in a variety of topics. Although any of these books can enhance the science topics it addresses in the book, they can also be great teaching tools for metacognitive reading strategies. Based on the metacognitive strategies found in Keene and Zimmerman's Mosaic of Thought, this article focuses on three of them—activating schema, asking questions, and determining importance. Other book recommendations for these strategies are also suggested. تنظر هذه المقالة إلى الوظائف المتعددة التي قد تؤديها كتب معلوماتية علمية في غرف الصف. والكتب المعروضة ها هنا عالية المستوى من الكتابة وتأتي معها المرئيات الخلاقة التي تشغل القراء في مواضيع متنوعة. ومع أن أي كتاب من هذه الكتب قد يعزز المواضيع العلمية التي يتناولها فيه فإنها قد تكون أدوات التعليم العظيمة لإستراتيجيات القراءة ما وراء المعرفة. ومبني على الإستراتيجيات ما وراء المعرفة الموجودة في فسيفساء التفكير بقلم كين وزممرمن فإن هذه المقالة تركز على ثلاثة منها وهي تنشيط البنى الذهنية وطرح الأسئلة وتحديد الأهمية. ويتم تقديم اقتراحات للكتب الأخرى التي توجد فيها هذه الإستراتيجيات. 本文考查科学信息书籍可供教室使用的多种用途。这些科学信息书籍的主题多样化，编写得很好，其创新的视觉效果能够引起读者的阅读兴趣。其中任何一本，都可加强读者对书中所针对的科学主题的认识，也可用作元认知阅读策略的极好教学工具。本文根据Keene和Zimmerman 所著的《思想集锦》书中的元认知策略，聚焦讨论其中的三个策略：激活用以吸收知识的基模、提问、确定重要性。本文也推荐其它有关这些元认知策略的书籍给读者。 Cet article jette un regard sur les finalités multiples auxquelles les livres d'information scientifique peuvent être utiles dans une classe. Les livres en question sont bien écrits, avec des visuels créatifs qui orientent les lecteurs vers des thèmes variés. Quoique chacun de ces livres permette une amélioration dans le thème scientifique traité dans le livre, ils peuvent aussi être de bons outils pédagogiques concernant les stratégies métacognitives de lecture. En se basant sur les stratégies métacognitives que l'on trouve dans Mosaïque de pensée de Keene and Zimmerman, cet article se centre sur trois d'entre elles — l'activation de schémas, le fait de poser des questions, et l'évaluation de l'importance. On recommande également d'autres livres qui se rapportent à ces stratégies. В статье обсуждаются разнообразные задачи, которые можно решать в классе с помощью научно‐популярных книг. В качестве примера приводятся хорошо написанные и творчески проиллюстрированные книги, посвященные множеству интересных для учащихся тем. Помимо того, что любая из этих книг способна значительно расширить научные представления детей, все они представляют собой замечательный материал для обучения школьников необходимым при чтении метакогнитивным стратегиям. Данная статья основана на стратегиях из книги “Мозаика мысли” (Keene and Zimmerman). В качестве примера приводятся “активационная схема”, “постановка вопросов” и “определение важности прочитанного”. Читатель получит целый список книг, при чтении которых можно использовать предложенные стратегии. Este artículo investiga los múltiples usos que se les pueden dar a los libros sobre las ciencias en el aula. Los libros presentados están bien escritos y tienen imágenes creativas que atraen a los lectores a los varios temas que presentan. Aunque cualquiera de estos libros puede enriquecer el tema presentado en él, se pueden usar también como herramientas en el aprendizaje de estrategias metacognoscitivas de lectura. Basado en las estrategias metacognoscitivas encontradas en Mosaic of Thought de Keene y Zimmerman, este artículo se ocupa de tres de ellas—activar diagramas, hacer preguntas, y determinar la importancia. También se recomiendan otros libros para estas estrategias.

Much early discussion on the glaciations now dated as late Neoproterozoic (Cryogenian) emanated from the small geological community working in South Australia in the early twentieth century, when their age was regarded as Lower Cambrian. An initial glacial interpretation of long known 'conglomerates' by H. P. Woodward was made as early as 1884. Papers by Adelaide-based W. Howchin, were published in British, US and German Journals in 1908, 1911 and 1912 respectively, advocating floating sea ice as a major depositional mechanism. Sydney-based T. W. E. David was also significantly involved via the longstanding Glacial Research Committee of the Australasian Association for Advancement of Science. David publicised recognition of the glaciation at the International Geological Congress in Mexico (1906) where he also suggested that the entire earth might have been glaciated, hence foreshadowing the modern 'snowball earth' hypothesis. Objections to the hypothesis of a 'Lower Cambrian' glaciation were also raised at an early stage by Howchin's Adelaide-based colleagues. Howchin and his adversaries defended their opposing views in voluminous and fiery articles in the South Australian press in the period 1905—1912 during which both sides endeavoured to undermine their opponent's credibility. By 1907, David had also appreciated the importance of carbonate beds that succeed glacial deposition. R. Lockhart Jack recognised two major glacial episodes within the modern late Neoproterozoic as early as 1913.

South Koreans are voting for a new president in a snap electiontriggered by a brief period of martial law imposed by the now-impeached former leader Yoon Suk Yeol. But there was no breakthroughon a proposed ceasefire that Ukraine, its European allies andWashington have all urged Russia to accept. Ukrainian drones hitRussian airbases in largest single-day attack since war began,targeting strategic bombers. U.S. President Donald Trump and China'sPresident Xi Jinping will likely hold a long-awaited call later thisweek. New details about the attack on a Jewish gathering in Boulder,Colorado and the suspect accused of carrying it out. Polish PrimeMinister Donald Tusk says he will soon call for a parliamentaryconfidence vote after opposition candidate Karol Nawrocki won thecountry's presidential runoff on Sunday. GUESTS: Justin Wolfers

While climate change has been most frequently measured and symbolized through increases in atmospheric carbon dioxide and rising sea levels, this dissertation investigates how global warming is also perceived through shifting environmental temporalities. As the timing of migrations, monsoons, ice melt, and blooming periods shift, climate change alters the annual rhythms characterizing environments across the globe. As environmental time becomes disordered—as seasons creep forward and glacial ablation accelerates—climate change produces what I term climatic arrhythmias: environmental pulses experienced as disturbingly premature or delayed, perhaps even absent. If—as literary critics from Northrop Frye to Lawrence Buell have argued—literary forms are bound to seasonal cycles and rhythms, then climate change will have aesthetic as well as ecological repercussions. Climatic rhythms structure seasonally-organized environmental prose, literary almanacs, travel narratives, and landscape documentaries: the climate undergirds a wide range of literary and artistic forms. Drawing on literary and environmental projects—including phenological writing at Walden Pond, a novella depicting extended drought in Chennai, time-lapse photography of Arctic glaciers, and an Australian novel featuring a magical realist migration of climate change refugees and birds—I examine how literature documents and responds to the disrupted temporal ecologies of the Anthropocene. By analyzing contemporary climate science and literary form in tandem, my research catalogues how climatic arrhythmias register phenomenologically and affectively as well as statistically, producing an embodied, connotative account of the globe’s shifting rhythms.