In eigener Sache: Ab sofort ist der Newsletter-Service zum Blog wieder nutzbar. Am rechten Rand der Eingangsseite des Blogs finden Sie die Möglichkeit sich ein- und auszutragen. Sie erhalten dann eine automatische Email, die Sie noch einmal bestätigen müssen. Dies verhindert einen Mißbrauch der Ein- und Austragfunktion. Bei Problemen bitte umgehend bei der Kalte-Sonne-Redaktion melden. Alle die bereits in der Newsletterliste eingetragen waren, brauchen nichts zu tun. Wir hoffen, dass jetzt wieder alles reibungslos klappt. Danke auch allen Spendern, deren Unterstützung uns den entsprechenden Websupport ermöglicht.
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Bei politisch sensiblen Themen versagt die ansonsten so beliebte Online-Enzyklopädie Wikipedia. Aktivisten haben sich mit viel Aufwand an entscheidenden Stellen postiert und stellen sicher, dass allein ihre Sichtweise in den Wikipedia-Sachartikeln erscheint. Rubikon brachte am 10. Oktober 2018 einen guten Beitrag zum Problem:
Das Lexikon der Lügen
Stellen wir die Deutungshoheit der Wikipedia infrage!
Ältere hatten ihren Brockhaus, Jüngere konsultieren für alle Informationen automatisch Wikipedia. So verschieden diese Lexika sind, gemeinsam ist ihnen ein ehrfürchtig bestaunter Ruf absoluter Sachlichkeit und Neutralität. Im Schatten dieses lupenreinen Images gedeihen Manipulation und Desinformation umso besser. Es gibt mittlerweile unzählige Belege dafür, dass Wikipedia einseitig informiert, diffamiert und hetzt, z.B. gegen Kriegsgegner, gegen alternative Medizin und Wissenschaft. Wir sollten das Online-Lexikon vor diesem Hintergrund nur noch mit Vorsicht genießen. Langfristig hilft aber nur eines: Wir müssen selbst handeln und ein besseres Lexikon auf die Beine stellen.
Weiterlesen auf Rubikon.
Ein solcher Versuch ist z.B. FreeWiki.
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Die Klimavariabilität ist zu warmen Zeiten generell größer als zu kälteren. Zu diesem Ergebnis kamen Forscher des University College London (UCL). Pressemitteilung vom 12. Oktober 2018:
Does climate vary more from century to century when it is warmer?
Century-scale climate variability was enhanced when the Earth was warmer during the Last Interglacial period (129-116 thousand years ago) compared to the current interglacial (the last 11,700 years), according to a new UCL-led study.
The findings, published today in Nature Communications and funded by the Natural Environment Research Council (NERC) and the Australian Research Council (ARC), reveal that the Last Interglacial period was punctuated by a series of century-scale arid events in southern Europe and cold water-mass expansions in the North Atlantic. Assessing natural climate variability under relatively warm conditions is crucial to inform projections under future carbon emission scenarios. Professor Chronis Tzedakis (UCL Geography), study lead author, said: „The Last Interglacial is particularly relevant because it provides insights into climate processes during a period of excess warmth.“
The Last Interglacial period contained an interval of intense Arctic warming, with surface air temperatures estimated at 3-11°C above pre-industrial, comparable to high-latitude warming scenarios for the end of this century. Global sea-level during the Last Interglacial is estimated to have been ~6-9 m above present, with 0.6-3.5 m derived from melting of the Greenland Ice Sheet.
Previously, several North Atlantic and European records have detected century-scale changes in temperature and precipitation within the Last Interglacial, but there has been considerable uncertainty over the timing, extent and origin of these climate oscillations. This new study by international researchers from twelve institutions used marine and terrestrial geological archives, coupled with climate model experiments, to create the most detailed timeline of ocean and atmosphere changes in the North Atlantic and southern Europe during the Last Interglacial.
To address the uncertainties in comparing records from different environments, researchers produced a „stratigraphic ‚rosetta stone‘ by analysing different fossils from the same sediment samples in a marine core off Lisbon,“ said Dr Luke Skinner (Cambridge University) who led the palaeoceanographic analyses. „The marine core also contained pollen transported from the Tagus river into the deep sea, thus enabling a direct comparison of vegetation and North Atlantic ocean changes,“ said Dr Vasiliki Margari (UCL Geography), who undertook the pollen analysis.
Changes in vegetation, primarily caused by variations in the amount of rainfall, were then linked to changes in the chemical signature of rainfall recorded in stalagmites from Corchia Cave in northern Italy. „The Corchia record is particularly important because it is supported by very detailed radiometric dating using the decay of uranium isotopes, producing one of the best chronologies for this period available,“ said Dr Russell Drysdale (University of Melbourne), who led the team studying the Italian cave.
Climate model experiments, undertaken by Dr Laurie Menviel and Dr Andrea Taschetto of the University of New South Wales Sydney, revealed that the spatial fingerprint of these changes was consistent with disruptions of the Atlantic meridional overturning circulation. Greenland ice-melt and runoff as a result of strong high-latitude warming during the Last Interglacial may have contributed to the weakening of the Atlantic meridional overturning circulation and to the observed climate changes. „Although not a strict analogue for future anthropogenically-driven changes, the profile of the Last Interglacial that emerges is one of enhanced century-scale climate instability, with implications for ice-sheet and ocean dynamics,“ said Professor Tzedakis. „Future research efforts should focus on constraining further the extent of melting and runoff from the Greenland ice-sheet and its effects on ocean circulation during the Last Interglacial.“
