How does the local wind field control the aerosol distribution in coastal Dronning Maud Land?

Atmospheric circulation patterns and chemical concentrations in firn cores are highly related to each other. Atmospheric winds transport aerosols like sea salt and mineral dust over the globe and redistribute them. Because of this, it is possible to reconstruct atmospheric circulation bringing aerosol to Antarctica by analyzing chemical impurities in firn and ice. With these analyses, the gap caused by sparse atmospheric measurements can be filled and this knowledge can then be used to improve the understanding of local and global circulation patterns.Due to a very high accumulation rate (~600 kg/m²*a), coastal Dronning Maud Land (CDML) is a perfect site to conduct these studies.Here, the upper 6m of two firn cores drilled on Halvfaryggen and Sörasen (covering the time interval from 2002- 2007) were analyzed on ionic concentrations. This data was then contrasted to measurements from the air chemistry laboratories at Neumayer (NM) and Kohnenstation (KS), and synoptic measurements from automatic weather stations (distributed in CDML and at NM).The analyses show very different results: Sea salt ions (e.g. Na+) are higher correlated to ions measured in aerosol samples at the air chemistry laboratory at KS than to the one located at NM. In contrast, ions representing mineral dust (e.g. nss-Ca2+) only have a weak correlation over the whole area and time period. Accordingly, the deposition of aerosol is highly dependent on its origin and the topography in coastal Antarctica suggesting different transport pathways for sea level and higher altitude sites

Fragmented perspectives: creating empathy through experiments in form and perspective in short fiction

This thesis addresses a creative writing approach to exploring reader empathy through the critical analysis of writing devices implemented by contemporary American short fiction writers and through creative experimentation through a written collection of short stories. It explores the ways in which writers can implement specific literary devices to potentially affect a reader's emotional reaction to a character or situation. The specified devices in this research have been utilised by contemporary American authors in their short fiction collections, namely Lydia Davis (The Collected Stories of Lydia Davis), George Saunders (Tenth of December), and David Foster Wallace (Brief Interviews with Hideous Men), who have influenced reader empathy in their short stories. Two categories of devices are in focus: narrative perspective and story format. These categories are signified due to contemporary American authors' experimentation with these devices and due to their inclusion in literary theory on reader empathy and fiction, namely Suzanne Keen's theory of narrative empathy. She focuses on the importance of reader empathy (namely, the effects that fiction can have on a reader in reality) and discusses devices that writers have used to possibly evoke these emotions. Keen explores the relationship between a reader and character identification, with a further emphasis on reader empathy and reader altruism in an inter-disciplinary setting, stating that reader empathy may lead to reader altruism; however, little to no research has been conducted on the creative implementation of writing techniques in regards to reader empathy from the perspective of a creative writer. Through creative application, this thesis aims to show the ways in which devices explored by narrative theorists can create the possibility for reader empathy. Therefore, the thesis takes into account first-, second-, and third-person narrative perspectives and question and answer (Q&A), short-short (a.k.a. flash fiction), and segmented formats through literary analysis of contemporary short fiction and through writing experimentation in the form of a short story collection. The thesis aims to explore the creative use of these devices and their linkage to reader reaction by the production of a short fiction collection entitled Fragmented Perceptions: A Collection of Characters. This creative work intends to implement the specified devices researched in order to experiment with perspective and format in relation to a possible empathetic connection of the reader to a character. Finally, by analysing possible effects on reader empathy through devices employed in the creative work, the thesis explores ways in which authors can use narrative perspective and format to discover various ways in which a writer can implement devices to affect reader empathy through short fiction

The Carrington event not observed in most ice core nitrate records

The Carrington Event of 1859 is considered to be among the largest space weather events of the last 150 years. We show that only one out of 14 well-resolved ice core records from Greenland and Antarctica has a nitrate spike dated to 1859. No sharp spikes are observed in the Antarctic cores studied here. In Greenland numerous spikes are observed in the 40 years surrounding 1859, but where other chemistry was measured, all large spikes have the unequivocal signal, including co-located spikes in ammonium, formate, black carbon and vanillic acid, of biomass burning plumes. It seems certain that most spikes in an earlier core, including that claimed for 1859, are also due to biomass burning plumes, and not to solar energetic particle (SEP) events. We conclude that an event as large as the Carrington Event did not leave an observable, widespread imprint in nitrate in polar ice. Nitrate spikes cannot be used to derive the statistics of SEPs

Comment on “Low time resolution analysis of ice cores cannot detect impulsive nitrate events” by D. F. Smart et al.

Smart et al. (2014) suggested that the detection of nitrate spikes in polar ice cores from solar energetic particle (SEP) events could be achieved if an analytical system with sufficiently high resolution was used. Here we show that the spikes they associate with SEP events are not reliably recorded in cores from the same location, even when the resolution is clearly adequate. We explain the processes that limit the effective resolution of ice cores. Liquid conductivity data suggest that the observed spikes are associated with sodium or another nonacidic cation, making it likely that they result from deposition of sea salt or similar aerosol that has scavenged nitrate, rather than from a primary input of nitrate in the troposphere. We consider that there is no evidence at present to support the identification of any spikes in nitrate as representing SEP events. Although such events undoubtedly create nitrate in the atmosphere, we see no plausible route to using nitrate spikes to document the statistics of such events

Preschool Children's Attention to Environmental Messages about Groups: Social Categorization and the Origins of Intergroup Bias

This is the authors' accepted manuscript, post peer-review. The publisher's official version is available electronically from: http://dx.doi.org/10.1111/j.1467-8624.2006.00906.x .The present study was designed to examine the effects of adults’ labeling and use of social groups on preschool children’s intergroup attitudes. Children (N = 87, aged 3 to 5) attending daycare were given measures of classification skill and self-esteem and assigned to membership in a novel (“red” or “blue”) social group. In experimental classrooms, teachers used the color groups to label children and organize the classroom. In control classrooms, teachers ignored the color groups. After three weeks, children completed multiple measures of intergroup attitudes. Results indicated that children in both types of classrooms developed ingroup-biased attitudes. As expected, children in experimental classrooms showed greater ingroup bias on some measures than children in control classrooms

A matheuristic for a customer assignment problem in direct marketing

In direct marketing, companies use sales campaigns to target their customers with personalized product offers. The effectiveness of direct marketing greatly depends on the assignment of customers to campaigns. In this paper, we consider a real-world planning problem of a major telecommunications company that assigns its customers to individual activities of its direct marketing campaigns. Various side constraints, such as budgets and sales targets, must be met. Conflict constraints ensure that individual customers are not assigned too frequently to similar activities. Related problems have been addressed in the literature; however, none of the existing approaches cover all the side constraints considered here. To close this gap, we develop a matheuristic that employs a new decomposition strategy to cope with the large number of conflict constraints in typical problem instances. In a computational experiment, we compare the performance of the proposed matheuristic to the performance of two mixed-binary linear programs on a test set that includes large-scale real-world instances. The matheuristic derives near-optimal solutions in short running times for small- to medium-sized instances and scales to instances of practical size comprising millions of customers and hundreds of activities. The deployment of the matheuristic at the company has considerably increased the overall effectiveness of its direct marketing campaigns

Effects of Physical Atypicality on Children's Social Issues and Intergroup Attitudes

This is the authors' accepted manuscript, post-peer review. The publisher's official version is available electronically from: http://dx.doi.org/10.1177/0165025407081472.Individuals vary in the degree to which they are representative, or typical, of their social groups. To investigate the effects of atypicality on intergroup attitudes, elementary-school-age children (N = 97) attending a summer school program were assigned to novel color groups that included typical (blue or green) and atypical (light blue or light green) members. Children’s state self-esteem, ingroup identification, and intergroup attitudes (e.g., trait ratings, evaluations, peer preferences) were assessed following several weeks in the classroom. Results indicated that atypicality primarily affected children’s views of their ingroup. Among younger (but not older) children, atypical group members viewed themselves as more similar to—but less happy being a member of—their ingroup than typical group members

Effect of past century mining activities on sediment properties and toxicity to freshwater organisms in northern Sweden

The release of toxic metals from local mining activities often represents a severe environmental hazard for nearby lake ecosystems. Previous studies on the impact of mining have primarily focused on single lakes, with less emphasis on spatial and temporal recovery patterns of multiple lakes within the same catchment, but with different hydrological connection and distance to the pollutant source. This knowledge gap prevents us from assessing the real environmental risk of abandoned mines and understanding ecosystem recovery. This study explores the intensity and spatial patterns of sediment contamination and the potential for ecosystem recovery in three lakes in close vicinity of a lead (Pb) and zinc (Zn) mine in Sweden that has been inoperative for >20 years. Dated (210Pb and 137Cs) sediment cores from each lake were used to reconstruct temporal patterns in trace element deposition and relate those with past mining activities. Results show that all lakes were affected by mining, indicated by increasing Pb and Zn concentrations and decreasing organic matter content, at the onset of mining. However, the extent and timing of mining impact differed between lakes, which was partly ascribed to differences in the historical use of tailings and settling ponds. Assessment of toxicity levels in sediments, based on normalized Probable Effect Concentration Quotient (PEC-Q) to organic matter content, provided more consistent results with the historical mining than conventional methods, showing a decreasing impact in lakes once the operations ceased. Still, sediment Pb concentrations were > 10 times higher than pre-mining values, evidencing the urgent need for remediation actions in the study lakes. This study highlights the importance of considering spatial heterogeneity in metal deposition, sediment organic matter content, and hydrological connectivity with tailings when risk assessments are performed in mining-impacted lakes. The use of normalized PEC-Q in toxic assessments is also recommended

Acute transverse myelitis in Lyme neuroborreliosis

Introduction: Acute transverse myelitis (ATM) is a rare disorder (1-8 new cases per million of population per year), with 20% of all cases occurring in patients younger than 18years of age. Diagnosis requires clinical symptoms and evidence of inflammation within the spinal cord (cerebrospinal fluid and/or magnetic resonance imaging). ATM due to neuroborreliosis typically presents with impressive clinical manifestations. Case presentation: Here we present a case of Lyme neuroborreliosis-associated ATM with severe MRI and CSF findings, but surprisingly few clinical manifestations and late conversion of the immunoglobulin G CSF/blood index of Borrelia burgdorferi sensu lato. Conclusion: Clinical symptoms and signs of neuroborrelial ATM may be minimal, even in cases with severe involvement of the spine, as shown by imaging studies. The CSF/blood index can be negative in the early stages and does not exclude Lyme neuroborreliosis; if there is strong clinical suspicion of Lyme neuroborreliosis, appropriate treatment should be started and the CSF/blood index repeated to confirm the diagnosi