Impact of volcanic stratospheric aerosols on diurnal temperature range in Europe over the past 200 years: Observations versus model simulations

We analyze the impact of stratospheric volcanic aerosols on the diurnal temperature range (DTR) over Europe using long-term subdaily station records. We compare the results with a 28-member ensemble of European Centre/Hamburg version 5.4 (ECHAM5.4) general circulation model simulations. Eight stratospheric volcanic eruptions during the instrumental period are investigated. Seasonal all- and clear-sky DTR anomalies are compared with contemporary (approximately 20 year) reference periods. Clear sky is used to eliminate cloud effects and better estimate the signal from the direct radiative forcing of the volcanic aerosols. We do not find a consistent effect of stratospheric aerosols on all-sky DTR. For clear skies, we find average DTR anomalies of −0.08°C (−0.13°C) in the observations (in the model), with the largest effect in the second winter after the eruption. Although the clear-sky DTR anomalies from different stations, volcanic eruptions, and seasons show heterogeneous signals in terms of order of magnitude and sign, the significantly negative DTR anomalies (e.g., after the Tambora eruption) are qualitatively consistent with other studies. Referencing with clear-sky DTR anomalies to the radiative forcing from stratospheric volcanic eruptions, we find the resulting sensitivity to be of the same order of magnitude as previously published estimates for tropospheric aerosols during the so-called “global dimming” period (i.e., 1950s to 1980s). Analyzing cloud cover changes after volcanic eruptions reveals an increase in clear-sky days in both data sets. Quantifying the impact of stratospheric volcanic eruptions on clear-sky DTR over Europe provides valuable information for the study of the radiative effect of stratospheric aerosols and for geo-engineering purposes.

The Incidence of AIDS-Defining Illnesses at a Current CD4 Count >=200 Cells/ L in the Post-Combination Antiretroviral Therapy Era

Background. Few studies consider the incidence of individual AIDS-defining illnesses (ADIs) at higher CD4 counts, relevant on a population level for monitoring and resource allocation. Methods. Individuals from the Collaboration of Observational HIV Epidemiological Research Europe (COHERE) aged ≥14 years with ≥1 CD4 count of ≥200 µL between 1998 and 2010 were included. Incidence rates (per 1000 person-years of follow-up [PYFU]) were calculated for each ADI within different CD4 strata; Poisson regression, using generalized estimating equations and robust standard errors, was used to model rates of ADIs with current CD4 ≥500/µL. Results. A total of 12 135 ADIs occurred at a CD4 count of ≥200 cells/µL among 207 539 persons with 1 154 803 PYFU. Incidence rates declined from 20.5 per 1000 PYFU (95% confidence interval [CI], 20.0–21.1 per 1000 PYFU) with current CD4 200–349 cells/µL to 4.1 per 1000 PYFU (95% CI, 3.6–4.6 per 1000 PYFU) with current CD4 ≥ 1000 cells/µL. Persons with a current CD4 of 500–749 cells/µL had a significantly higher rate of ADIs (adjusted incidence rate ratio [aIRR], 1.20; 95% CI, 1.10–1.32), whereas those with a current CD4 of ≥1000 cells/µL had a similar rate (aIRR, 0.92; 95% CI, .79–1.07), compared to a current CD4 of 750–999 cells/µL. Results were consistent in persons with high or low viral load. Findings were stronger for malignant ADIs (aIRR, 1.52; 95% CI, 1.25–1.86) than for nonmalignant ADIs (aIRR, 1.12; 95% CI, 1.01–1.25), comparing persons with a current CD4 of 500–749 cells/µL to 750–999 cells/µL. Discussion. The incidence of ADIs was higher in individuals with a current CD4 count of 500–749 cells/µL compared to those with a CD4 count of 750–999 cells/µL, but did not decrease further at higher CD4 counts. Results were similar in patients virologically suppressed on combination antiretroviral therapy, suggesting that immune reconstitution is not complete until the CD4 increases to >750 cells/µL.

Iron fluxes to Talos Dome, Antarctica, over the past 200 kyr

Atmospheric fluxes of iron (Fe) over the past 200 kyr are reported for the coastal Antarctic Talos Dome ice core, based on acid leachable Fe concentrations. Fluxes of Fe to Talos Dome were consistently greater than those at Dome C, with the greatest difference observed during interglacial climates. We observe different Fe flux trends at Dome C and Talos Dome during the deglaciation and early Holocene, attributed to a combination of deglacial activation of dust sources local to Talos Dome and the reorganisation of atmospheric transport pathways with the retreat of the Ross Sea ice shelf. This supports similar findings based on dust particle sizes and fluxes and Rare Earth Element fluxes. We show that Ca and Fe should not be used as quantitative proxies for mineral dust, as they all demonstrate different deglacial trends at Talos Dome and Dome C. Considering that a 20 ppmv decrease in atmospheric CO2 at the coldest part of the last glacial maximum occurs contemporaneously with the period of greatest Fe and dust flux to Antarctica, we confirm that the maximum contribution of aeolian dust deposition to Southern Ocean sequestration of atmospheric CO2 is approximately 20 ppmv.�

Die Entwicklung des Religionsunterrichts in der Schweiz im Spannungsfeld von Kirche, Staat und Schule im 19. und 20. Jahrhundert. Eine Übersicht am Beispiel ausgewählter Kantone. Teil 1: Kanton Waadt

Dieser Beitrag widmet sich der Geschichte des Religionsunterrichts im Kanton Waadt und stellt gleichzeitig den Auftakt zu einer Artikelserie dar, mit deren Hilfe die Entwicklung dieses Fachs in der Schweiz während des 19. und 20. Jahrhunderts genauer untersucht werden soll. Mittels einer diachro- nen Perspektive wird so die Situierung sowohl jüngster Reformen des Religionsunterrichts als auch der sie begleitenden Debatten in einem breiteren historischen Kontext angestrebt. Somit wird die Identifizierung von Brüchen und Kontinuitäten in diesem Unterrichtsbereich möglich.

Warum sind die 200 ungarischen Reichstagsdeputirten in Wien? Wer die Geschichte der österreichischen Völker eine Strecke weit zurückverfolgt ...

Welsch (Projektbearbeiter): Aufruf zur Versöhnung zwischen Kroaten und Ungarn anläßlich des bevorstehenden Zusammentreffens einer ungarischen Reichstagsdeputation mit ihrem König Ferdinand V. in Wien

200 Jahre Stadtmusik Bern. Vereinsgeschichte 1816-2016

Nicht jeder Musikverein darf auf 200 Jahre Bestand zurückblicken. Die Stadtmusik Bern ist stolz, eine der ältesten und noch bestehenden Blasmusikformationen der Schweiz zu sein – und dazu noch mit einer so vielgestaltigen und aussergewöhnlichen Geschichte! Gestartet als Garnisonsmusik unter militärischer Prägung wandelte sie sich unter so grossen Namen wie Carl Friedemann und Stephan Jaeggi im 20. und 21. Jahrhundert zu einem modernen Blasorchester. Neben Einblicken in die 200 Jahre der Vereinsgeschichte werden drei aktuelle Herausforderungen besprochen, mit denen heute viele Musikvereine zu tun haben: die Probendisziplin, die ausreichende Versorgung mit finanziellen Mitteln und die beständige Sorge um den musikalischen Nachwuchs. An illustrativen Episoden aus der Geschichte der Stadtmusik kann gezeigt werden, dass diese drei Problemkreise so alt sind wie der Verein selber. Schliesslich kommen auch Vorstands- und Aktivmitglieder zu Wort. In Form von Interviews geben sie Auskunft über ihren musikalischen Werdegang, über ihr Mitwirken im Verein und darüber, wie sie die Zukunft der Stadtmusik sehen. Damit ist die Stadtmusik Bern gerüstet für die nächsten 200 Jahre.