The public sphere in the twilight zone of publicness

The article discusses the reasons and conditions for the rise and fall of the popularity of the public sphere concept in scholarly discourse in four parts. The first part examines the peculiar circumstances of the emergence of the concept of the public sphere, and its rapid and widespread adoption in the social sciences. The second part discusses the complexity of the concept “Öffentlichkeit” and its English proxy “the public sphere,” and the contemporary critique of its ideological predispositions. The third part focuses on the liberalization and (operational) banalization of the concept. The final part suggests ways in which social scientists could respond critically to the challenges outlined earlier and reintegrate publicness, the public, and the public sphere into the analysis.

Utilization of Soot and 210 Po-210 Pb Disequilibria to Constrain Particulate Organic Carbon Fluxes in the Northeastern South China Sea

Black carbon (BC) is believed to be refractory and thus affects the timescale of organic carbon conversion into CO2 and the magnitude of the sink of CO2. However, the fate of BC in the oceans remains poorly understood. Here, 210Po and 210Pb were measured to examine the export of soot in the northeastern South China Sea (SCS). Concentrations of soot decreased from 0.141 ± 0.021 μmol-C L–1 (mean ± SD) in the mixed layer (0–30 m) to 0.087 μmol-C L–1 at the euphotic base (150 m) due to potential photodegradation within the euphotic zone. In the twilight zone, however, the soot showed an increasing pattern along with the total particulate matter and total particulate organic carbon (POC) contents, corresponding to additions from the shelf/slope sediment resuspension through lateral transport. Using the deficits of 210Po, the export flux of soot from the euphotic zone was calculated to be 0.172 ± 0.016 mmol-C m–2 d–1 and increased with depth. Assuming that the soot is entirely refractory below the euphotic zone, the sediment-derived soot fluxes were estimated based on the increase in soot fluxes relative to the base of the euphotic zone, with values varying from 0.149 ± 0.030 to 0.96 ± 0.10 μmol-C L–1. This indicates that sediment resuspension is an important source of soot to the ocean interior in the SCS. Coupling the sediment-derived soot and 210Po-derived POC fluxes gave rise to a Martin Curve-like flux attenuation of local euphotic zone-derived POC in the twilight zone with b value of 0.70 ± 0.01. These results suggest that soot could be useful for constraining in situ POC fluxes and their transport.

Impact of intensifying nitrogen limitation on ocean net primary production is fingerprinted by nitrogen isotopes

The open ocean nitrogen cycle is being altered by increases in anthropogenic atmospheric nitrogen deposition and climate change. How the nitrogen cycle responds will determine long-term trends in net primary production (NPP) in the nitrogen-limited low latitude ocean, but is poorly constrained by uncertainty in how the source-sink balance will evolve. Here we show that intensifying nitrogen limitation of phytoplankton, associated with near-term reductions in NPP, causes detectable declines in nitrogen isotopes (δ15N) and constitutes the primary perturbation of the 21st century nitrogen cycle. Model experiments show that ~75% of the low latitude twilight zone develops anomalously low δ15N by 2060, predominantly due to the effects of climate change that alter ocean circulation, with implications for the nitrogen source-sink balance. Our results highlight that δ15N changes in the low latitude twilight zone may provide a useful constraint on emerging changes to nitrogen limitation and NPP over the 21st century.

Loop Structures in Film (and Literature): Experiments with Time Between the Poles of Classical and Complex Narration

Among the many innovations complex or “puzzle” films have brought about in the last three decades, experiments with narrative time feature prominently. And within the category of nonlinear plots, the loop structure – exemplified by films such as Repeaters (Canada 2010), Source Code (USA/France 2011), Looper (USA/China 2012) or the TV-Series Day Break (USA 2006) – has established itself as an interesting variant defying certain norms of storytelling while at the same time conforming in most cases to the needs of genre and mass audience comprehension. In the first part of my paper, I will map out different kinds of repeated action plots, paying special attention to constraints and potentialities pertaining to this particular form. In the second part, I will address the issue of narrative complexity, showing that loop films cover a wide range from “excessively obvious” mainstream (e.g. Groundhog Day, USA 1992; 12:01, USA 1993; Edge of Tomorrow, USA/Canada 2014) to disturbing narrative experiments such as Los Cronocrimenes (Spain 2007) or Triangle (Great Britain/Australia 2009). Finally, a look at two early examples (Repeat Performance, USA 1947 and Twilight Zone: Judgement Day, USA 1959) will raise the question how singular the recent wave of loop films are from a historical perspective.

Yagder serratus, a new eyeless weevil from Mexico and the non-monophyly of Brachycerinae, the evolutionary twilight zone of true weevils (Coleoptera: Curculionidae)

We describe and illustrate a new eyeless weevil, Yagder serratus gen. & sp. nov., based on a single adult female collected by sifting forest leaf litter in Mexico. A phylogenetic analysis of 39 terminals and 2679 aligned positions from three DNA fragments places the new species into the subfamily Brachycerinae (as incertae sedis) and outside the highly diversified clade of ‘higher’ true weevils. Neither Brachycerinae, nor its tribe Raymondionymini traditionally uniting most eyeless weevils, are monophyletic unless the latter is limited to a Mediterranean core group. Both these taxa are taxonomic dumping-grounds likely containing species-poor sisters of species-rich clades. When resolved, the subfamily Brachycerinae will be likely split into two or more species-poor deeply-divergent subfamilies.