bluuebunny/crossref_metadata_2025_split huggingface dataset:
Authentische Führung
Authors: Franke-Bartholdt Luise , Frömmer Dirk , Wegge Jürgen , Strobel Anja 
Published: June 2018

Zusammenfassung. Zur Erfassung authentischer Führung fehlt im deutschen Sprachraum ein transparent validiertes Messverfahren. Der vorliegende Beitrag soll mit einer deutschen Adaption des Authentic Leadership Inventory von Neider und Schriesheim (2011) diese Lücke schließen. Nach der Übersetzung des Originals wurde das Deutsche Inventar Authentischer Führung (DIAF) in drei Stichproben (Ngesamt = 705) geprüft und modifiziert. In konfirmatorischen Faktorenanalysen konnte die theoretisch postulierte Binnenstruktur mit vier Komponenten bestätigt werden: Selbstbewusstheit, Transparenz in Beziehung zu anderen, verinnerlichte moralische Perspektive und ausgewogene Informationsverarbeitung. Die internen Konsistenzen der Gesamtskala (16 Items) und Einzelkomponenten lagen im guten bis sehr guten Bereich. Es wurden erwartungskonforme Zusammenhänge zu anderen Führungsskalen gefunden (positive Korrelationen zu ethischer Führung und Leader Member Exchange, negative Korrelationen zu destruktiver Führung). Das Instrument zeigte bedeutsame Zusammenhänge zu zentralen organisationalen Ergebniskriterien (Wohlbefinden, Arbeitsengagement, individuelle Leistung) und inkrementelle Validität über andere Führungsskalen hinaus. Insgesamt kann das DIAF als ökonomisches und valides Verfahren zur Erfassung authentischer Führung eingesetzt werden.
A New Framework to Enable Equitable Outcomes: Resilience and Nexus Approaches Combined
Authors: Stringer L. C. , Quinn C. H. , Le H. T. V. , Msuya F. , Pezzuti J. , Dallimer M. , Afionis S. , Berman R. , Orchard S. E. , Rijal M. L. 
Published: June 2018

AbstractManaging integrated social‐ecological systems to reduce risks to human and environmental well‐being remains challenging in light of the rate and extent of undesirable changes that are occurring. Developing frameworks that are sufficiently integrative to guide research to deliver the necessary insights into all key system aspects is an important outstanding task. Among existing approaches, resilience and nexus framings both allow focus on unpacking relationships across scales and levels in a system and emphasize the involvement of different groups in decision making to different extents. They also suffer weaknesses and neither approach puts social justice considerations explicitly at its core. This has important implications for understanding who wins and loses out from different decisions and how social and ecological risks and trade‐offs are shared and distributed, temporally and spatially. This paper conceptually integrates resilience and nexus approaches, developing a combined framework and indicating how it could effectively be operationalized in cases from mountain and mangrove social‐ecological systems. In doing so, it advances understanding of complex social‐ecological systems framings for risk‐based decision making beyond that which could be achieved through use of either resilience or nexus approaches alone. Important next steps in testing the framework involve empirical and field operationalization, requiring interdisciplinary, mixed method approaches.
A Numerical Study of the Thermospheric Overcooling During the Recovery Phases of the October 2003 Storms
Authors: Chen Xuetao , Lei Jiuhou 
Published: June 2018

AbstractPrevious studies showed that the density overcooling in the thermosphere during the recovery phases of the October 2003 storms was not reproduced by the National Center for Atmospheric Research Thermosphere‐Ionosphere Electrodynamics General Circulation Model. In this study, a series of controlled numerical experiments were carried out to explore the processes responsible for the neutral density overcooling. It was found that the simulation with the temperature‐dependent reaction rate of N(2D) + O2 from Duff et al. (2003, https://doi.org/10.1029/2002GL016720) can better capture the overcooling during the recovery phases of the October 2003 storms. Our study also demonstrated that the thermosphere recovery strongly depends on the altitudinal distribution of NO emission per mass rather than the NO cooling flux alone. During the storm recovery phases, the temperature starts to show overcooling in 110–180 km where the NO increases primarily, which has great contribution to the density overcooling.
A Horizontal Ice Core From Taylor Glacier, Its Implications for Antarctic Climate History, and an Improved Taylor Dome Ice Core Time Scale
Authors: Baggenstos Daniel , Severinghaus Jeffrey P. , Mulvaney Robert , McConnell Joseph Robert , Sigl Michael , Maselli Olivia , Petit Jean‐Robert , Grente Benjamin , Steig Eric J. 
Published: June 2018

AbstractIce core records from Antarctica show mostly synchronous temperature variations during the last deglacial transition, an indication that the climate of the entire continent reacted as one unit to the global changes. However, a record from the Taylor Dome ice core in the Ross Sea sector of East Antarctica has been suggested to show a rapid warming, similar in style and synchronous with the Oldest Dryas—Bølling warming in Greenland. Since publication of the Taylor Dome record, a number of lines of evidence have suggested that this interpretation is incorrect and reflects errors in the underlying time scale. The issues raised regarding the dating of Taylor Dome currently linger unresolved, and the original time scale remains the de facto chronology. We present new water isotope and chemistry data from nearby Taylor Glacier to resolve the confusion surrounding the Taylor Dome time scale. We find that the Taylor Glacier record is incompatible with the original interpretation of the Taylor Dome ice core, showing that the warming in the area was gradual and started at ∼18 ka BP (before 1950) as seen in other East Antarctic ice cores. We build a consistent, up‐to‐date Taylor Dome chronology from 0 to 60 ka BP by combining new and old age markers based on synchronization to other ice core records. The most notable feature of the new TD2015 time scale is a gas age—ice age difference of up to 12,000 years during the Last Glacial Maximum, by far the largest ever observed.
Sustained Groundwater Loss in California's Central Valley Exacerbated by Intense Drought Periods
Authors: Ojha Chandrakanta , Shirzaei Manoochehr , Werth Susanna , Argus Donald F. , Farr Tom G. 
Published: June 2018

AbstractThe accelerated rate of decline in groundwater levels across California's Central Valley results from overdrafting and low rates of natural recharge and is exacerbated by droughts. The lack of observations with an adequate spatiotemporal resolution to constrain the evolution of groundwater resources poses severe challenges to water management efforts. Here we present SAR interferometric measurements of high‐resolution vertical land motion across the valley, revealing multiscale patterns of aquifer hydrogeological properties and groundwater storage change. Investigating the depletion and degradation of the aquifer‐system during 2007–2010, when the entire valley experienced a severe drought, we find that ~2% of total aquifer‐system storage was permanently lost, owing to irreversible compaction of the system. Over this period, the seasonal groundwater storage change amplitude of 10.11 ± 2.5 km3 modulates a long‐term groundwater storage decline of 21.32 ± 7.2 km3. Estimates for subbasins show more complex patterns, most likely associated with local hydrogeology, recharge, demand, and underground flow. Presented measurements of aquifer‐system compaction provide a more complete understanding of groundwater dynamics and can potentially be used to improve water security.
A Small Temperate Lake in the 21st Century: Dynamics of Water Temperature, Ice Phenology, Dissolved Oxygen, and Chlorophyll a
Authors: Tan Zeli , Yao Huaxia , Zhuang Qianlai 
Published: June 2018

AbstractIt is unclear how small temperate lakes will evolve physically and biologically in the whole water column under future climate because previous modeling studies usually focused on only one or two physical or biological state variables in the surface waters. Here we used a well‐validated lake biogeochemistry model driven by different climate scenarios of the 21st century to predict the dynamics of ice phenology, water temperature, dissolved oxygen (DO), and chlorophyll a in a small Canadian temperate lake (0.714 km2) that is oligotrophic and strongly stratified in summer, considering the influence of catchment hydrology. The ice season and thickness of the lake are projected to shrink substantially under warming, resulting in a positive energy feedback between climate and the lake. Due to the reduced heat diffusion and water mixing, the dynamics of water temperature in surface and deep waters of the lake are considerably different, with surface waters warmed dramatically but deep waters muted to warming. DO depletion is predicted to occur in the whole water column of the lake under warming, but the controlling processes are depth dependent. Unexpectedly, the predicted growth of the lake's chlorophyll a is small under warming, due to the weakened convection and the mismatch of the timings of favorable solar radiation, thermal, and nutrient conditions. For the examined state variables, our prediction shows that only the dynamics of DO is significantly impacted by the changing catchment hydrology. This study suggests that similar temperate lakes will have diverse physical and biological responses to climate change.
Effects of a Solar Flare on the Martian Hot O Corona and Photochemical Escape
Authors: Lee Yuni , Dong Chuanfei , Pawlowski Dave , Thiemann Edward , Tenishev Valeriy , Mahaffy Paul , Benna Mehdi , Combi Michael , Bougher Stephen , Eparvier Frank 
Published: June 2018

AbstractWe examine for the first time the flare‐induced effects on the Martian hot O corona. The rapid ionospheric response to the increase in the soft X‐ray flux (~800%) facilitates more hot O production at altitudes below the main ionospheric peak, but almost all of these atoms are thermalized before escape. In response to the increase in the extreme ultraviolet (EUV) flux (~170%), the overall upper ionospheric and thermospheric densities are enhanced, and the peak thermospheric responses are found ~1.5 hr later. The photochemical escape rate is predicted to increase by ~20% with the increases in the soft X‐ray and EUV fluxes but decrease rapidly by ~13% about 2.5 hr later before recovering the preflare level. Since escaping hot O atoms are mostly produced at high altitudes where ionization by the EUV flux is the greatest, the main contributor to the 20% increase in escape rate is the enhancement in the EUV flux.
The Eye of Saturn's North Polar Vortex: Unexpected Cloud Structures Observed at High Spatial Resolution by Cassini/VIMS
Authors: Baines K. H. , Sromovsky L. A. , Fry P. M. , Momary T. W. , Brown R. H. , Buratti B. J. , Clark R. N. , Nicholson P. D. , Sotin C. 
Published: June 2018

AbstractNear‐infrared spectral maps of Saturn's north polar vortex obtained at high spatial resolution provided by Cassini/Visual Infrared Mapping Spectrometer (VIMS) reveal localized ammonia clouds composed of unusually large particles exceeding 13 μm in radius, the largest cloud particles documented during the Cassini mission. Taken under near‐optimum direct polar lighting and viewing conditions within a month of the summer solstice, these small (~200 km in breadth) discrete clouds are located within the eye of the polar vortex, which otherwise is unusually clear of observable aerosols in reflected sunlight, with total 2‐μm opacity <0.04 versus >1.0 elsewhere on Saturn. The dichotomy of large‐particle condensate cloud features—indicative of convective upwelling—within a large (~ 2000‐km diameter) nearly aerosol‐free region of downwelling characteristic of the core of a polar vortex reveals surprising polar dynamics on Saturn.
Automatic Correction of Contaminated Images for Assessment of Reservoir Surface Area Dynamics
Authors: Zhao Gang , Gao Huilin 
Published: June 2018

AbstractThe potential of using Landsat for assessing long‐term water surface dynamics of individual reservoirs at a global scale has been significantly hindered by contaminations from clouds, cloud shadows, and terrain shadows. A novel algorithm was developed toward the automatic correction of these contaminated image classifications. By applying this algorithm to the data set by Pekel et al. (2016, https://doi.org/10.1038/nature20584), time series of area values for 6,817 global reservoirs (with an integrated capacity of 6,099 km3) were generated from 1984 to 2015. The number of effective images that can be used in each time series has been improved by 81% on average. The long‐term average area for these global reservoirs was corrected from 1.73 × 105 km2 to 3.94 × 105 km2. The results were proven to be robust through validation using observations, synthetic data, and visual inspection. This continuous reservoir surface area data set can provide benefit to various applications (both at continental and local scales).
The Acceleration of Ultrarelativistic Electrons During a Small to Moderate Storm of 21 April 2017
Authors: Zhao H. , Baker D. N. , Li X. , Jaynes A. N. , Kanekal S. G. 
Published: June 2018

AbstractThe ultrarelativistic electrons (E > ~3 MeV) in the outer radiation belt received limited attention in the past due to sparse measurements. Nowadays, the Van Allen Probes measurements of ultrarelativistic electrons with high energy resolution provide an unprecedented opportunity to study the dynamics of this population. In this study, using data from the Van Allen Probes, we report significant flux enhancements of ultrarelativistic electrons with energies up to 7.7 MeV during a small to moderate geomagnetic storm. The underlying physical mechanisms are investigated by analyzing and simulating the evolution of electron phase space density. The results suggest that during this storm, the acceleration mechanism for ultrarelativistic electrons in the outer belt is energy‐dependent: local acceleration plays the most important role in the flux enhancements of ~3–5 MeV electrons, while inward radial diffusion is the main acceleration mechanism for ~7 MeV electrons at the center of the outer radiation belt.
Properties of Intense Field‐Aligned Lower‐Band Chorus Waves: Implications for Nonlinear Wave‐Particle Interactions
Authors: Zhang X.‐J. , Thorne R. , Artemyev A. , Mourenas D. , Angelopoulos V. , Bortnik J. , Kletzing C. A. , Kurth W. S. , Hospodarsky G. B. 
Published: June 2018

AbstractResonant interactions between electrons and chorus waves are responsible for a wide range of phenomena in near‐Earth space (e.g., diffuse aurora and acceleration of > 1 MeV electrons). Although quasi‐linear diffusion is believed to be the primary paradigm for describing such interactions, an increasing number of investigations suggest that nonlinear effects are also important in controlling the rapid dynamics of electrons. However, present models of nonlinear wave‐particle interactions, which have been successfully used to describe individual short‐term events, are not directly applicable for a statistical evaluation of nonlinear effects and the long‐term dynamics of the outer radiation belt, because they lack information on the properties of intense (nonlinearly resonating with electrons) chorus waves. In this paper, we use the Time History of Events and Macroscale Interactions during Substorms and Van Allen Probes data sets of field‐aligned chorus waveforms to study two key characteristics of these waves: effective amplitude
(nonlinear interaction can occur when
) and wave packet length β (the number of wave periods within it). While as many as 10–15% of chorus wave packets are sufficiently intense (
–3) to interact nonlinearly with relativistic electrons, most of them are short (β < 10) reducing the efficacy of such interactions. Revised models of nonlinear interactions are thus needed to account for the long‐term effects of these common, intense but short chorus wave packets. We also discuss the dependence of
, β on location (MLT and L‐shell) and on the properties of the suprathermal electron population.
Shipboard Observations of the Meteorology and Near‐Surface Environment During Autumn Freezeup in the Beaufort/Chukchi Seas
Authors: Persson P. Ola G. , Blomquist Byron , Guest Peter , Stammerjohn Sharon , Fairall Christopher , Rainville Luc , Lund Björn , Ackley Stephen , Thomson Jim 
Published: June 2018

AbstractThe collection and processing of shipboard air, ice, and ocean measurements from the Sea State field campaign in the Beaufort/Chukchi Seas in autumn 2015 are described and the data used to characterize the near‐surface freezeup environment. The number of parameters measured or derived is large and the location and time of year are unique. Analysis was done of transits through the new, growing ice and of ice edge periods. Through differential surface energy fluxes, the presence of new, thin sea ice (<50 cm) produces lower tropospheric air temperatures in the ice interior that average ~4°C colder than those over open water near the ice edge, resulting in an ice edge baroclinic zone. This temperature difference doubles by late October and produces thermodynamic and dynamic feedbacks. These include off‐ice, cold‐air advection leading to enhanced surface heat loss averaging ~200 W/m2 over the open water, formation of low‐level jets, suppression of the ice edge baroclinic zone, and enhanced ice drift. The interior ice growth rate is thermodynamically consistent with a surface heat loss of ~65 W/m2 to the atmosphere and a heat flux of several tens of W/m2 from the ocean below. Ice drift at times contributes to the southward advance of the autumn ice edge through off‐ice winds. The ocean thermohaline structure is highly variable and appears associated with bathymetric features, small‐scale upper‐ocean eddies, and the growing ice cover. Lower salinity under the ice interior compared to the nearby ice edge is an upper‐ocean impact of this thin ice cover.
Observations of Shelf Exchange and High‐Frequency Variability in an Alaskan Fjord
Authors: Merrifield Sophia , Otero Mark , Terrill Eric 
Published: June 2018

AbstractHigh‐frequency observations collected over 3 years are used to describe upper‐ocean variability in Behm Canal, a nonglacial fjord in Southeast Alaska. The fjord is sheltered by surrounding topography and connected to the outer continental shelf by a 400‐m‐deep strait. Summer conditions are characterized by strong near‐surface stratification, a sea breeze wind regime, and tidally dominated flows. In nonsummer months, baroclinic subinertial flows exceeding 0.5 m/s dominate the velocity record. The flow events represent a wind‐driven response to low‐pressure systems that impact the coast as they propagate across the Gulf of Alaska. The observations suggest that the storm systems generate downwelling events that propagate into the fjord with a mode‐one‐like vertical structure in the upper 60 m. Following the initial up‐fjord current pulse lasting approximately a day, a down‐fjord flow occurs lasting several days, the duration of the downwelling anomaly. These subinertial downwelling events likely are the dominant mechanism of shelf‐fjord exchange, with estimated fjord‐flushing times of 50 days. The downwelling events are accompanied by enhanced near‐inertial shear, which exhibits downward energy propagation. Evidence for enhanced energy near the maximum buoyancy frequency in the thermocline suggests high‐frequency internal wave trapping, with the primary energy source in the semidiurnal band associated with tidal and wind forcing. The observations highlight the importance of shelf‐fjord coupling through meteorological forcing and the existence of internal wave energy at a range of frequencies, which have implications for mixing and transport within the fjord.
Interannual Modulations of the 50‐Day Oscillations in the Celebes Sea: Dynamics and Impact
Authors: Chen Xiao , Qiu Bo , Chen Shuiming , Cheng Xuhua , Qi Yiquan 
Published: June 2018

AbstractIntense 50‐day oscillations have been previously observed at the entrance of Celebes Sea, and their formation has been suggested to be a result of Rossby wave resonance where the frequency of cyclonic eddy shedding by the intruding Mindanao Current matches that of the gravest Rossby mode of the semienclosed Celebes Sea basin. Using the ocean state estimate of 1993–2016 from the Estimating the Circulation and Climate of the Ocean, Phase II, we detected strong interannual modulations in the shedding of cyclonic eddies at the Celebes Sea entrance. Active eddy sheddings occurred during 1993, 2002–2003, 2006–2010, and 2013–2015. Southward shifting of the wind‐driven North Pacific tropical gyre and the concurrent strengthening of the Mindanao Current southeast of the Mindanao Island in these years are found to be inducive for the generation of cyclonic eddies intruding into the Celebes Sea. Modulated by the activity of eddy sheddings, the upper ocean water mass properties in both the Celebes Sea and Makassar Strait exhibit noticeable interannual changes with less saline waters appearing in the 75‐ to 175‐m layer during the active eddy shedding years.
Three‐Dimensional Turbulence‐Resolving Simulations of the Plunge Phenomenon in a Tilted Channel
Authors: Schuch F. N. , Pinto L. C. , Silvestrini J. H. , Laizet S. 
Published: June 2018

AbstractHyperpycnal flows are produced when the density of a fluid flowing in a relatively quiescent basin is greater than the density of the fluid in the basin. The density differences can be due to the difference in temperatures, salinity, turbidity, concentration, or a combination of them. When the inflow momentum diminishes, the inflowing fluid eventually plunges under the basin fluid and flows along the bottom floor as an underflow density current. In the present work, 3‐D turbulence‐resolving simulations are performed for an hyperpycnal flow evolving at the bottom floor of a tilted channel. Using advanced numerical techniques designed for supercomputers, the incompressible Navier‐Stokes and transport equations are solved to reproduce numerically the experiments of Lamb et al. (2010, https://doi.org/10.1130/B30125.1) obtained inside a flume with a long tilted ramp. This study focuses on presenting and validating a new numerical framework for the correct reproduction and analysis of the plunge phenomenon and its associated flow features. A very good agreement is found between the experimental data of Lamb et al. (2010), the analytical models of Parker and Toniolo (2007, https://doi.org/10.1061/(ASCE)0733-9429(2007)133:6(690)), and the present turbulence‐resolving simulations. The mixing process between the ambient fluid and the underflow density current is also analyzed thanks to visualizations of vortical structures at the interface.
The Relationship of Near‐Surface Flow, Stokes Drift and the Wind Stress
Authors: Clarke Allan J. , Van Gorder Stephen 
Published: June 2018

AbstractMany years of simultaneous hourly buoy wind and directional wave spectra data in the Gulf of Mexico and the Pacific were used to estimate Stokes drift and u* ew where u* = (magnitude of the local windstress/water density)1/2 and ew is a unit vector in the direction of the local wind. Stokes drift and u* ew were strongly vectorally correlated, the two vectors on average being within a few degrees of one another. This result remained valid even when there was evidence of remotely forced swell. Extension of the observed wave spectra above 0.35 Hz to the u*‐dependent wave breaking frequency shows that typically the e‐folding scale of the Stokes drift with depth is less than 1.8 m, much smaller than the Ekman layer e‐folding scale. Therefore, there is negligible induced Eulerian cancellation of the Stokes drift, and the surface particle movement is governed by the Eulerian velocity + |uStokes|ew. Taking into account wave spreading, |uStokes| typically ranges from about 3 to 13 cm/s. Thus, the Stokes drift, which can be estimated directly from the wind stress, is an order one contributor to the surface transport of particles.