• Energy Research

Publiziert als Diskussionsbeiträge der Scientists for Future 5 (43 pp). Die Erstveröffentlichung (nur in Deutsch) erfolgte am 16. Dez. 2020, diese geringfügige Revision 1.1 (Deutsch und Englisch) am 16. Jan. 2021. GERMAN SUMMARY (English Summary further below): Die Zeit drängt. Ohne schnell wirksame Gegenmaßnahmen werden Erderhitzung und Biodiversitätsverlust Ausmaße annehmen, welche die Lebensweise von Menschen nicht abschätzbaren Risiken aussetzen. Obwohl die Herausforderungen weiten Teilen der Bevölkerung bewusst sind, werden dringend nötige Entscheidungen aufgeschoben oder nur teilweise umgesetzt. Eine Ursache hierfür sind fehlende Foren, in denen sich Bürger:innen mit Expert:innen austauschen und gemeinsam mögliche Szenarien und Lösungen erörtern können. Scientists for Future empfiehlt deshalb, mit geeigneten Formen von Bürger:innenversammlungen eine breite und demokratisch partizipative Beteiligung an Zukunftsgestaltung und -sicherung zu ermöglichen. Diese sollten auch unabhängig von einem Auftrag von Regierung oder Parlament initiiert werden. Wir rufen daher zu einem Gründungstreffen auf, um Planung und Durchführung einer Bürger:innenversammlung zum Thema Klima im Jahr 2021 zu ermöglichen. Eine sorgfältige Planung ist nötig, damit die Durchführung neutral und offen geschieht. Hierfür werden einige zentrale Kriterien beschrieben. ENGLISH SUMMARY: Time is pressing. Without quick and effective countermeasures, global warming and loss of biodiversity will assume proportions that expose people’s way of life to incalculable risks. Although large parts of the population are aware of the challenges, urgently needed decisions are postponed or only partially implemented. One reason for this is the lack of forums where citizens can discuss possible scenarios and solutions with experts. Therefore, Scientists for Future recommends enabling a broad and democratic participatory involvement in shaping and securing the future by appropriate forms of citizens’ assemblies. These should also be initiated independently of a mandate from government or parliament. We therefore call for a founding meeting to enable the planning and implementation of a citizens’ assembly on the topic of climate in 2021. A careful planning is necessary, so that the execution happens neutrally and openly. For this purpose, some central criteria are described. ___ Suggested citation: Hagedorn, G.; Baasch, S., Blöbaum, A., Brendel, H., Hardt, J.N., Heiland, S. Klins­mann, M., Matthies, E., Pfennig, A., West, C., Wipfler, B., et al., (2021). Scientists for Future empfiehlt eine reprä­sen­ta­tive Klima-Bürger:innen­ver­sammlung im Jahr 2021 / Scientists for Future recommends a representative Climate Citizens’ Assem­bly in 2021 (Version 1.1, in Deutsch/German & Englisch/English). Diskussionsbeiträge der Scientists for Future, 5, 23 pp. doi:10.5281/zenodo.4417265. Volume 5 of "Diskussionsbeiträge der Scientists for Future". This publication contains both the German original text and an English translation.

Dust deposition in the Southern Ocean constitutes a critical modulator of past global climate variability, but how it has varied temporally and geographically is underdetermined. Here, we present data sets of glacial-interglacial dust-supply cycles from the largest Southern Ocean sector, the polar South Pacific, indicating three times higher dust deposition during glacial periods than during interglacials for the past million years. Although the most likely dust source for the South Pacific is Australia and New Zealand, the glacial-interglacial pattern and timing of lithogenic sediment deposition is similar to dust records from Antarctica and the South Atlantic dominated by Patagonian sources. These similarities imply large-scale common climate forcings, such as latitudinal shifts of the southern westerlies and regionally enhanced glaciogenic dust mobilization in New Zealand and Patagonia.

The dataset comprises the main geochemical characteristics of purified lake sediment samples from Lake Bolshoye Shchuchye, in the Polar Ural based on EDS and stable isotope data. Moreover, core segment (column A), composite depth (in cm; column B); calibrated age (in cal ka BP; column C) are given. Details on coring and age model are given in Lenz et al. (2021) Energy-Dispersive X-ray Spectroscopy (EDS) was carried out with a scanning electron microscope (SEM) at the German Research Centre for Geosciences (GFZ Potsdam, Germany) to assess contamination of all diatom samples (following Chapligin et al., 2012). Three replicate analyses were carried out with an excited-area size with a radius of ~200 μm at an acceleration voltage of 20.0 kV. All detectable elements were normalized to 100% weight. The results were expressed as weight percentages (in %) and displayed as oxides: SiO2 content (%); Al2O3 content (%); Na2O content (%); MgO content (%); K2O content (%); CaO content (%); MnO content (%); FeO content (%): Total sum (%) of the purified sediment sample (columns D to L). Details are given in Meyer et al. (2022) The diatom oxygen isotope composition (δ18Odiatom) from lacustrine sediments helps tracing the hydrological and climate dynamics in individual lake catchments. The oxygen isotope data has been generated in the ISOLAB Facility Potsdam including all d18Odiatom values (all in ‰ vs. VSMOW). The measured δ18O values (δ18Omeas), the standard deviation (SD) and number of replicates (N) are given (columns M to O), as well as the calculated contamination (ccont; in %) and δ18O values corrected for contamination (δ18Ocorr) (columns P to Q). The details of the contamination correction and isotope analytics are given in Meyer et al. (2022)

Dust deposition in the Southern Ocean constitutes a critical modulator of past global climate variability, but how it has varied temporally and geographically is underdetermined. Here, we present data sets of glacial-interglacial dust-supply cycles from the largest Southern Ocean sector, the polar South Pacific, indicating three times higher dust deposition during glacial periods than during interglacials for the past million years. Although the most likely dust source for the South Pacific is Australia and New Zealand, the glacial-interglacial pattern and timing of lithogenic sediment deposition is similar to dust records from Antarctica and the South Atlantic dominated by Patagonian sources. These similarities imply large-scale common climate forcings such as latitudinal shifts of the southern westerlies and regionally enhanced glaciogenic dust mobilization in New Zealand and Patagonia.