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  • 1
    Keywords: Cold air pools ; Downslope winds ; Horizontal inhomogeneity ; Hydraulic jumps ; Large eddy simulation ; mountain waves ; orographic precipitation ; Sub-mesoscale circulations ; Thermally-driven flows ; Turbulent fluxes
    Description / Table of Contents: 05 Editorial: The Atmosphere over Mountainous Regions / Miguel A. C. Teixeira, Daniel J. Kirshbaum, Haraldur Ólafsson, Peter F. Sheridan and Ivana Stiperski --- 07 Possible observation of horizontal roll vortices over the Adriatic Sea during bora / Danijel Belušić, Željko Večenaj and Margaret A. LeMone --- 14 Lee Waves on the Boundary-Layer Inversion and Their Dependence on Free-Atmospheric Stability / Johannes Sachsperger, Stefano Serafin and Vanda Grubišic’ --- 25 Non-linear Topographic Effects in Two-Layer Flows / Peter G. Baines and Edward R. Johnson --- 35 The Quasi-Steady State of the Valley Wind System / Juerg Schmidli and Richard Rotunno --- 46 Convective Boundary Layer Heights Over Mountainous Terrain—A Review of Concepts / Stephan F. J. De Wekker and Meinolf Kossmann --- 68 On the Vertical Exchange of Heat, Mass, and Momentum Over Complex, Mountainous Terrain / Mathias W. Rotach, Alexander Gohm, Moritz N. Lang, Daniel Leukauf, Ivana Stiperski and Johannes S. Wagner --- 82 Identification and Climatology of Alpine Pumping from a Regional Climate Simulation / Maximilian Graf, Meinolf Kossmann, Kristina Trusilova and Gudrun Mühlbacher --- 93 The Atmospheric Boundary Layer during Wintertime Persistent Inversions in the Grenoble Valleys / Yann Largeron and Chantal Staquet --- 112 Energetics of Slope Flows: Linear and Weakly Nonlinear Solutions of the Extended Prandtl Model / Ivan Güttler , Ivana Marinović, Željko Večenaj and Branko Grisogono --- 125 When Can a High-Resolution Simulation Over Complex Terrain be Called LES? / Joan Cuxart --- 131 Influence of the Details of Topography on Weather Forecast – Evaluation of HARMONIE Experiments in the Sochi Olympics Domain over the Caucasian Mountains / Laura Rontu, Clemens Wastl and Sami Niemelä --- 147 Effects of Landfall Location and Approach Angle of an Idealized Tropical Cyclone over a Long Mountain Range / Liping Liu, Yuh-Lang Lin and Shu-Hua Chen
    Pages: Online-Ressource (160 Seiten)
    ISBN: 9782889450169
    Language: English
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  • 2
    Keywords: microbial ecology ; biogeochemistry ; stoichiometry ; Climate Change ; soil microbiology ; elemental fluxes ; Respiration ; aquatic microbiology ; microbiology
    Description / Table of Contents: Advances in next generation sequencing technologies, omics, and bioinformatics are revealing a tremendous and unsuspected diversity of microbes, both at a compositional and functional level. Moreover, the expansion of ecological concepts into microbial ecology has greatly advanced our comprehension of the role microbes play in the functioning of ecosystems across a wide range of biomes. Super-imposed on this new information about microbes, their functions and how they are organized, environmental gradients are changing rapidly, largely driven by direct and indirect human activities. In the context of global change, understanding the mechanisms that shape microbial communities is pivotal to predict microbial responses to novel selective forces and their implications at the local as well as global scale. One of the main features of microbial communities is their ability to react to changes in the environment. Thus, many studies have reported changes in the performance and composition of communities along environmental gradients. However, the mechanisms underlying these responses remain unclear. It is assumed that the response of microbes to changes in the environment is mediated by a complex combination of shifts in the physiological properties, single-cell activities, or composition of communities: it may occur by means of physiological adjustments of the taxa present in a community or selecting towards more tolerant/better adapted phylotypes. Knowing whether certain factors trigger one, many, or all mechanisms would greatly increase confidence in predictions of future microbial composition and processes. This Research Topic brings together studies that applied the latest molecular techniques for studying microbial composition and functioning and integrated ecological, biogeochemical and/or modeling approaches to provide a comprehensive and mechanistic perspective of the responses of micro-organisms to environmental changes. This Research Topic presents new findings on environmental parameters influencing microbial communities, the type and magnitude of response and differences in the response among microbial groups, and which collectively deepen our current understanding and knowledge of the underlying mechanisms of microbial structural and functional responses to environmental changes and gradients in both aquatic and terrestrial ecosystems. The body of work has, furthermore, identified many challenges and questions that yet remain to be addressed and new perspectives to follow up on.
    Pages: Online-Ressource (263 Seiten)
    ISBN: 9782889197231
    Language: English
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  • 3
    Unknown
    Lausanne : Frontiers
    Keywords: climate ; Climate Change ; marine mammals ; predators ; seabirds ; trophic interactions
    Description / Table of Contents: Climate change affects all components of marine ecosystems. For endothermic top predators, i.e. seabirds and marine mammals, these impacts are often complex and mediated through trophic relationships. In this Research Topic, leading researchers attempt to identify patterns of change among seabirds and marine mammals, and the mechanisms through which climate change drives these changes.
    Pages: Online-Ressource (180 Seiten)
    ISBN: 9782889197361
    Language: English
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  • 4
    Keywords: meteorology ; weather ; atmosphere ; atmospheric sciences ; climate research ; environmental research
    Description / Table of Contents: Classifications of circulation weather systems have a long history in meteorology and climatology. Starting with manual classifications over specific regions of the globe, these tools (generally called “catalogs of synoptic types”) were restricted mainly to weather forecasting and historical climate variability studies. In the last decades, the advance of computing resources and the availability of datasets have fostered the development of fast and objective methods that process large amount of data. In recent years numerous methods of circulation type classification have been designed, showing their usefulness on a wide range of applications in scientific domains related to weather, climate, and environment. This Research Topic highlights methodological advances in circulation weather types and also their applications to different research areas. The articles included in this research topic show that circulation weather types can be used not only in Europe, where they have been always more frequent, but also applied to other regions of the world.
    Pages: Online-Ressource (153 Seiten)
    ISBN: 9782889196418
    Language: English
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  • 5
    Keywords: deep subsurface ; marine sediment ; deep biosphere ; ocean crust ; subseafloor sediment ; Methane ; Peru margin ; Hydrogen ; acetogenesis ; sulfate reduction ; microbiology
    Description / Table of Contents: Deep subsurface microbiology is a highly active and rapidly advancing research field at the interface of microbiology and the geosciences; it focuses on the detection, identification, quantification, cultivation and activity measurements of bacteria, archaea and eukaryotes that permeate the subsurface biosphere of deep marine sediments and the basaltic ocean and continental crust. The deep subsurface biosphere abounds with uncultured, only recently discovered and – at best - incompletely understood microbial populations. In spatial extent and volume, Earth’s subsurface biosphere is only rivaled by the deep sea water column. So far, no deep subsurface sediment has been found that is entirely devoid of microbial life; microbial cells and DNA remain detectable at sediment depths of more than 1 km; microbial life permeates deeply buried hydrocarbon reservoirs, and is also found several kilometers down in continental crust aquifers. Severe energy limitation, either as electron acceptor or donor shortage, and scarcity of microbially degradable organic carbon sources are among the evolutionary pressures that have shaped the genomic and physiological repertoire of the deep subsurface biosphere. Its biogeochemical role as long-term organic carbon repository, inorganic electron and energy source, and subduction recycling engine continues to be explored by current research at the interface of microbiology, geochemistry and biosphere/geosphere evolution. This Research Topic addresses some of the central research questions about deep subsurface microbiology and biogeochemistry: phylogenetic and physiological microbial diversity in the deep subsurface; microbial activity and survival strategies in severely energy-limited subsurface habitats; microbial activity as reflected in process rates and gene expression patterns; biogeographic isolation and connectivity in deep subsurface microbial communities; the ecological standing of subsurface biospheres in comparison to the surface biosphere – an independently flourishing biosphere, or mere survivors that tolerate burial (along with organic carbon compounds), or a combination of both? Advancing these questions on Earth’s deep subsurface biosphere redefines the habitat range, environmental tolerance, activity and diversity of microbial life.
    Pages: Online-Ressource (303 Seiten)
    ISBN: 9782889195367
    Language: English
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  • 6
    Keywords: microbiology ; carbon cycle ; B vitamins ; cobalamin ; thiamin ; Pyridoxin ; Trace metals ; Molybdenum ; Vanadium ; Nickel ; Copper ; Coenzymes
    Description / Table of Contents: In the last three decades, research has extensively focused on the role of Fe and other mineral nutrients in regulating biological processes, ranging from the surface to the deep ocean. This has produced major breakthroughs in our understanding of the fundamental role of those bioactive elements on the carbon, nitrogen and sulfur cycles and ecosystem function. However, biological processes cannot be entirely sustained by that small set of chemical elements, and new scientific evidence suggests that trace metals other than Fe (e.g., Co, Mo and Ni) as well as essential organic growth factors (e.g., vitamins) may also be crucial in most aquatic systems.
    Pages: Online-Ressource (109 Seiten)
    ISBN: 9782889195466
    Language: English
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  • 7
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    Lausanne : Frontiers
    Keywords: hydrothermal vents ; extremophiles ; marine sediments ; Guaymas basin ; microbial biogeography ; microbiology
    Description / Table of Contents: Hydrothermally influenced microbial habitats and communities represent a much wider spectrum of geological setting, chemical in-situ regimes, and biotic community than the classical examples from basalt-hosted black smoker chimneys at active mid-ocean spreading centers. Hydrothermal vent ecosystems now include hydrothermally heated and chemically altered sediments, microbiota fueled by serpentinization reactions, and low-temperature vents with unusual menus of electron donors. Novel marine provinces and hydrothermal areas are being charted and explored, such as new hydrothermal vent systems in the Arctic, around Antarctica, in the Western Pacific and in the Indian Ocean. Novel environmental gradients and niches provide habitats for unusual or unprecedented microorganisms and microbial ecosystems. The discovery of novel extremophiles such as Aciduliprofundum and the Nanoarchaeota underscores that hydrothermal vent microbial communities can no longer be characterized as assemblages of only “typical” sulfur oxidizers, methanogens and heterotrophs. Different stages of hydrothermal activity, from early onset to peak activity, gradual decline, and persistence of cold and fossil vent sites, correspond to different colonization waves by microorganisms as well as megafauna. This research topic will continue to stretch the limits of hydrothermal vent microbiology, and also provide a forum for the chemical and microbial linkages of hydrothermal vents to the ocean water column and the ocean crust or sedimentary subsurface.
    Pages: Online-Ressource (286 Seiten)
    ISBN: 9782889196821
    Language: English
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  • 8
    Unknown
    Lausanne : Frontiers
    Keywords: nitrogen cycle ; microbial ecology ; nitrogen fixation ; denitrification ; Anammox ; nitrification ; microbiology
    Description / Table of Contents: Nitrogen is an essential element in biological systems, and one that often limits production in both aquatic and terrestrial systems. Due to its requirement in biological macromolecules, its acquisition and cycling have the potential to structure microbial communities, as well as to control productivity on the ecosystem scale. In addition, its versatile redox chemistry is the basis of complex biogeochemical transformations that control the inventory of fixed nitrogen, both in local environments and over geological time. Although many of the pathways in the microbial nitrogen cycle were described more than a century ago, additional fundamental pathways have been discovered only recently. These findings imply that we still have much to learn about the microbial nitrogen cycle, the organisms responsible for it, and their interactions in natural and human environments. Progress in nitrogen cycle research has been facilitated by recent rapid technological advances, especially in genomics and isotopic approaches. In this Research Topic, we reviewed the leading edge of nitrogen cycle research based on these approaches, as well as by exploring microbial processes in modern ecosystems.
    Pages: Online-Ressource (175 Seiten)
    ISBN: 9782889194124
    Language: English
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  • 9
    Keywords: bacteriophages ; environmental disturbance ; phage ecology ; aquatic microbiology ; phage therapy ; metaviromes ; evolution ; microarrays ; microbiology
    Description / Table of Contents: Viruses infect numerous microorganisms including, predominantly, Bacteria (bacteriophages or phages) but also Archaea, Protists, and Fungi. They are the most abundant and ubiquitous biological entities on Earth and are important drivers of ecosystem functioning. Little is known, however, about the vast majority of these viruses of microorganisms, or VoMs. Modern techniques such as metagenomics have enabled the discovery and description of more presumptive VoMs than ever before, but also have exposed gaps in our understanding of VoM ecology. Exploring the ecology of these viruses – which is how they interact with host organisms, the abiotic environment, larger organisms, and even other viruses across a variety of environments and conditions – is the next frontier. Integration of a growing molecular understanding of VoMs with ecological studies will expand our knowledge of ecosystem dynamics. Ecology can be studied at multiple levels including individual organisms, populations, communities, whole ecosystems, and the entire biosphere. Ecology additionally can consider normal, equilibrium conditions or instead perturbations. Perturbations are of particular interest because measuring the effect of disturbances on VoM-associated communities provides important windows into how VoMs contribute to ecosystem dynamics. These disturbances in turn can be studied through in vitro, in vivo, and in situ experimentation, measuring responses by VoM-associated communities to changes in nutrient availability, stress, physical disruption, seasonality, etc., and could apply to studies at all ecological levels. These are considered here across diverse systems and environments.
    Pages: Online-Ressource (95 Seiten)
    ISBN: 9782889194483
    Language: English
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