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Dezember 1925, Staatsoper Unter den Linden Berlin: Zwei Tage vor Weihnachten besuchen Theodor W. Adorno und Walter Benjamin die erste auf die aufsehenerregende Uraufführung folgende Vorstellung von Alban Bergs Oper Wozzeck: Es dirigiert Erich Kleiber, die Hauptpartien singen Leo Schützendorf, Fritz Soot und Sigrid Johanson. Nicht nur auf den 'Expertenhörer' Adorno - der in einem an seinen Kompositionslehrer übermittelten Bericht sowohl Benjamins Bestimmung des "Ausdruckslosen" aufgreift, als auch dessen physische Präsenz erwähnt - hinterlässt die Musik einen bleibenden Eindruck. Benjamin erinnert sich dieser Aufführung noch zehn Jahre später in einem seiner Briefe an Adorno und bekennt nach der Lektüre von dessen Berg-Analysen, "dass der überwältigende Eindruck, kraft dessen mich der Wozzeck an jenem Abend gefangen nahm, das Signal eines mir unbewussten aber bis ins einzelne nennbaren Betroffenseins gewesen ist". Von der geschichtsphilosophischen Einordnung der Berg'schen Musik, welche "wie die gleichsam namenlose technische Arbeit des Schülers Schönbergs die Tradition des 19ten Jahrhunderts im Namen des Musikers zur Ruhe geleitet und ihren eigenen Klagegesang anstimmen lässt", führt Benjamin sich dann sogar versucht, den "Begriff des 'kleinen Übergangs' [...] der Kompositionslehre abzuborgen (GB V, 565). Im Gegensatz zu Adorno wird Walter Benjamins Theorie jedoch kaum mit Musik in Verbindung gebracht, sondern vor allem für ihr Bilddenken geschätzt. Auch wenn im 'Ursprung des Deutschen Trauerspiels', in den Erinnerungsszenen der 'Berliner Kindheit', den Häuser- und Gedankenschluchten der 'Passagenarbeit' und nicht zuletzt in seinem Briefwechsel durchaus von Musik die Rede ist, rücken Klänge seltener in den Mittelpunkt seiner Schriften und sind in der Rezeption bisher auch weniger beachtet worden. Ohnedies wird derjenige enttäuscht, der gerade von Benjamin - so reizvoll es sein mag, sich solchen Gegenständen widmende Essays zu imaginieren - die Exegese des gängigen musikalischen Kanons erwartet: Keine Abhandlung zu Schuberts Streichquintett schließt an die Interpretation der 'Wahlverwandschaften' an und ebenso vergeblich sucht man nach die Erwägungen zum Trauerspiel auf die Affektkontrolle der 'opera seria' oder die des Kraus-Essays auf die Musik des 'Fackel'-Habitués Arnold Schönberg übertragenden Arbeiten. Dennoch kommt Musik, Klage und Tönen in Benjamins Reflexionen eine nicht unerhebliche Bedeutung zu. Selten drängen sie sich lautstark in den Vordergrund, erlauben aber - zumal in einer Zeit, in der auch die professionelle Auseinandersetzung mit Musik die ideale Beständigkeit musikalischer Werke und ihrer Texte zunehmend in Zweifel zieht - theoretische Einsichten, über die das auf andere Dinge gerichtete Ohr des Experten achtlos hinweggeht. In Ergänzung zur wohlbekannten epistemischen und poetischen Rolle seiner Sprach- und Denkbilder unternimmt dieser Band den ersten systematisch angelegten Versuch, sowohl den kultur- und medienhistorischen Zusammenhängen von Benjamins akustischen Motiven nachzugehen als auch ihre ästhetische Relevanz für die gegenwärtige Produktion und Reproduktion von Klängen zu reflektieren.
'The Making of Americans' wurde 1903 begonnen, 1905/6 zugunsten des Erzählbands 'Three Lives' unterbrochen, 1906 und 1908 komplett umgeschrieben und 1911 schließlich abgeschlossen (also viel früher als 'Ulysses' und 'À la recherche du temps perdu'). Zur Veröffentlichung des Romans kam es allerdings erst 1925, was die öffentliche Wahrnehmung des Textes als einer Urszene der Moderne stark beeinträchtigt hat. Aber es gibt auch noch andere Gründe, weshalb 'The Making of Americans' rasch in Vergessenheit geriet: der riesige Umfang des Romans (fast 1000 Seiten) und seine serielle Wiederholungsstruktur sorgten dafür, dass er einer größeren Leseöffentlichkeit bis heute weitgehend unbekannt blieb. Steins Aufkündigung der Erzähltradition des 19. Jahrhunderts fiel noch radikaler aus als Prousts und Joyces Romanexperimente. Es gibt aber durchaus Gemeinsamkeiten: alle drei Autoren machen die Prozesse des Erinnerns, Denkens und Fühlens zur Grundlage der Darstellung im Roman und verzichten auf die teleologische Konsequenz kausaler Verknüpfungen zugunsten des verdichteten Augenblicks. Schon im ursprünglichen Entwurf von 'The Making of Americans', der auf den ersten Seiten des Romans noch erkennbar ist, sind erste Anzeichen für den Bruch mit der Erzählform erkennbar. Stein wollte Amerika als neue Nation schildern, "whose tradition it had taken scarcely sixty years to create". Im Mittelpunkt sollten drei Generationen zweier Immigrantenfamilien stehen, die Dehnings und die Herslands. "The old people in a new world, the new people made out of old, that is the story that I mean to tell, for that is what really is and what I really know." Obwohl sie den Roman als Gesellschaftspanorama anlegte, konzentrierte sich Stein von Anfang an auf das Privatleben ihrer Protagonisten. Im Gegensatz zu den Realisten des 19. Jahrhunderts, die den Konflikt von Neigung und Pflicht, von sozialen Normen und subjektiver Moral in den Mittelpunkt der Handlung stellten, folgte Stein dem Programm des Naturalismus und richtete ihr Interesse nicht auf die Handlungen und Handlungsspielräume der Subjekte, sondern auf die gesellschaftlichen Kräfte, die Subjektivität formen und prägen. Der Titel 'The Making of Americans' fasst die Ausbildung amerikanischer Identität als einen beinah industriellen Herstellungsprozess sozialer Identität und deutet darin ein erstes Motiv für eine serielle Schreibweise an.
Desert dust is one of the most abundant ice nucleating particle types in the atmosphere. Traditionally, clay minerals were assumed to determine the ice nucleation ability of desert dust and constituted the focus of ice nucleation studies over several decades. Recently some feldspar species were identified to be ice active at much higher temperatures than clay minerals, redirecting studies to investigate the contribution of feldspar to ice nucleation on desert dust. However, so far no study has shown the atmospheric relevance of this mineral phase.
For this study four dust samples were collected after airborne transport in the troposphere from the Sahara to different locations (Crete, the Peloponnese, Canary Islands, and the Sinai Peninsula). Additionally, 11 dust samples were collected from the surface from nine of the biggest deserts worldwide. The samples were used to study the ice nucleation behavior specific to different desert dusts. Furthermore, we investigated how representative surface-collected dust is for the atmosphere by comparing to the ice nucleation activity of the airborne samples. We used the IMCA-ZINC setup to form droplets on single aerosol particles which were subsequently exposed to temperatures between 233 and 250 K. Dust particles were collected in parallel on filters for offline cold-stage ice nucleation experiments at 253–263 K. To help the interpretation of the ice nucleation experiments the mineralogical composition of the dusts was investigated. We find that a higher ice nucleation activity in a given sample at 253 K can be attributed to the K-feldspar content present in this sample, whereas at temperatures between 238 and 245 K it is attributed to the sum of feldspar and quartz content present. A high clay content, in contrast, is associated with lower ice nucleation activity. This confirms the importance of feldspar above 250 K and the role of quartz and feldspars determining the ice nucleation activities at lower temperatures as found by earlier studies for monomineral dusts. The airborne samples show on average a lower ice nucleation activity than the surface-collected ones. Furthermore, we find that under certain conditions milling can lead to a decrease in the ice nucleation ability of polymineral samples due to the different hardness and cleavage of individual mineral phases causing an increase of minerals with low ice nucleation ability in the atmospherically relevant size fraction. Comparison of our data set to an existing desert dust parameterization confirms its applicability for climate models. Our results suggest that for an improved prediction of the ice nucleation ability of desert dust in the atmosphere, the modeling of emission and atmospheric transport of the feldspar and quartz mineral phases would be key, while other minerals are only of minor importance.
Desert dust is one of the most abundant ice nucleating particle types in the atmosphere. Tra ditionally, clay minerals were assumed to determine the ice nucleation ability of desert dust and constituted the focus of ice nucleation studies. Only recently some feldspar species were identified to be ice-active at much higher temperatures than clay minerals, redirecting studies to investigate the contribution of feldspar to ice nucleation on desert dust. However, so far no study has shown the atmospheric relevance of this mineral phase.
For this study four dust samples were collected after airborne transport in the troposphere from the Sahara to different locations (Crete, the Peloponnese, Canary Islands and the Sinai Peninsula). Additionally, eleven dust samples were collected from the surface from nine of the biggest deserts worldwide. The samples were used to study the ice nucleation behavior specific to different desert dusts. Furthermore we investigated how representative ice nucleation on surface-collected dust is for that in the atmosphere by comparing to the ice nucleation activity of the airborne samples. We used the IMCA-ZINC set-up to form droplets on single aerosol particles which were subsequently exposed to temperatures between 233 - 250 K. Dust particles were collected in parallel on filters for offline cold stage ice nucleation experiments at 253 - 263 K. To help the interpretation of the results from the ice nucleation experiments the mineralogical composition of the dusts was investigated.We found that a higher ice nucleation activity in a given sample can be attributed at 253 K to the K-feldspar content present in this sample whereas at temperatures between 238 - 245 K it is attributed to the sum of feldspar and quartz content present. A high clay content on the other hand is associated with a lower ice nucleation activity of a sample. This confirms the importance of feldspar at T > 250 K and the role of quartz and feldspars determining the ice nucleation activities at lower T as found by earlier studies for monomineral dust surrogates. Furthermore, we find that milling may lead to a decrease in the ice nucleation ability of polymineral samples due to a change in mineralogical composition in the atmospherically relevant size fraction arising from the different hardness and cleavage of individual mineral phases. Comparison of our comprehensive data set to an existing desert dust parameterization confirms its applicability for climate models. Our results suggest that for an improved prediction of the ice nucleation ability of desert dust in the atmosphere, the modelling of emission and atmospheric transport of the feldspar and quartz mineral phases would be key while other minerals are only of minor importance.
In situ single particle analysis of ice particle residuals (IPRs) and out-of-cloud aerosol particles was conducted by means of laser ablation mass spectrometry during the intensive INUIT-JFJ/CLACE campaign at the high alpine research station Jungfraujoch (3580 m a.s.l.) in January–February 2013. During the 4-week campaign more than 70 000 out-of-cloud aerosol particles and 595 IPRs were analyzed covering a particle size diameter range from 100 nm to 3 µm. The IPRs were sampled during 273 h while the station was covered by mixed-phase clouds at ambient temperatures between −27 and −6 °C. The identification of particle types is based on laboratory studies of different types of biological, mineral and anthropogenic aerosol particles. The outcome of these laboratory studies was characteristic marker peaks for each investigated particle type. These marker peaks were applied to the field data. In the sampled IPRs we identified a larger number fraction of primary aerosol particles, like soil dust (13 ± 5 %) and minerals (11 ± 5 %), in comparison to out-of-cloud aerosol particles (2.4 ± 0.4 and 0.4 ± 0.1 %, respectively). Additionally, anthropogenic aerosol particles, such as particles from industrial emissions and lead-containing particles, were found to be more abundant in the IPRs than in the out-of-cloud aerosol. In the out-of-cloud aerosol we identified a large fraction of aged particles (31 ± 5 %), including organic material and secondary inorganics, whereas this particle type was much less abundant (2.7 ± 1.3 %) in the IPRs. In a selected subset of the data where a direct comparison between out-of-cloud aerosol particles and IPRs in air masses with similar origin was possible, a pronounced enhancement of biological particles was found in the IPRs.
In-situ single particle analysis of ice particle residuals (IPR) and out-of-cloud aerosol particles was conducted by means of laser ablation mass spectrometry during the intensive INUIT-JFJ/CLACE campaign at the high alpine research station Jungfraujoch (3580 m a.s.l.) in January/February 2013. During the four week campaign more than 70000 out-of-cloud aerosol particles and 595 IPR were analyzed covering a particle size diameter range from 100 nm to 3 μm. The IPR were sampled during 273 hours while the station was covered by mixed-phase clouds at ambient temperatures between -27 °C and -6 °C. The identification of particle types is based on laboratory studies of different types of biological, mineral and anthropogenic aerosol particles. As outcome instrument specific marker peaks for the different investigated particle types were obtained and applied to the field data. The results show that the sampled IPR contain a larger relative amount of natural, primary aerosol, like soil dust (13 %) and minerals (11 %), in comparison to out-of-cloud aerosol particles (2 % and <1 %, respectively). Additionally, anthropogenic aerosol particles, like particles from industrial emissions and lead-containing particles, were found to be more abundant in the IPR than in the out-of-cloud aerosol. The out of-cloud aerosol contained a large fraction of aged particles (30 %, including organic material and secondary inorganics), whereas this particle type was much less abundant (3 %) in the IPR. In a selected subset of the data where a direct comparison between out-of-cloud aerosol particles and IPR in air masses with similar origin was possible, a pronounced enhancement of biological particles was found in the IPR.
Size-resolved long-term measurements of atmospheric aerosol and cloud condensation nuclei (CCN) concentrations and hygroscopicity were conducted at the remote Amazon Tall Tower Observatory (ATTO) in the central Amazon Basin over a 1-year period and full seasonal cycle (March 2014–February 2015). The measurements provide a climatology of CCN properties characteristic of a remote central Amazonian rain forest site.
The CCN measurements were continuously cycled through 10 levels of supersaturation (S = 0.11 to 1.10 %) and span the aerosol particle size range from 20 to 245 nm. The mean critical diameters of CCN activation range from 43 nm at S = 1.10 % to 172 nm at S = 0.11 %. The particle hygroscopicity exhibits a pronounced size dependence with lower values for the Aitken mode (κAit = 0.14 ± 0.03), higher values for the accumulation mode (κAcc = 0.22 ± 0.05), and an overall mean value of κmean = 0.17 ± 0.06, consistent with high fractions of organic aerosol.
The hygroscopicity parameter, κ, exhibits remarkably little temporal variability: no pronounced diurnal cycles, only weak seasonal trends, and few short-term variations during long-range transport events. In contrast, the CCN number concentrations exhibit a pronounced seasonal cycle, tracking the pollution-related seasonality in total aerosol concentration. We find that the variability in the CCN concentrations in the central Amazon is mostly driven by aerosol particle number concentration and size distribution, while variations in aerosol hygroscopicity and chemical composition matter only during a few episodes.
For modeling purposes, we compare different approaches of predicting CCN number concentration and present a novel parametrization, which allows accurate CCN predictions based on a small set of input data.