GLORIA — GEOMAR Library Ocean Research Information Access

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BMBF Förderinitiative Paläo Modellierung (PalMod) : Vorhaben (Verbund) PalMod-1-3: Lange transiente Simulationen : Abschlussbericht : Laufzeit: 01.08.2015-30.04.2021 (2021)

Knorr, Gregor [VerfasserIn]

Bremerhaven : Alfred-Wegener-Institut (AWI) Helmholtz-Zentrum für Polar- und Meeresforschung

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Schlagwort(e): Forschungsbericht ; Pleistozän ; Paläoklima ; Modell ; Simulation ; Meer ; Kohlenstoffkreislauf

Materialart: Online-Ressource

Seiten: 1 Online-Ressource (15 Seiten, 223,21 KB)

URL: https://doi.org/10.2314/KXP:1828248134

DOI: 10.2314/KXP:1828248134

Sprache: Deutsch , Englisch

Anmerkung: Förderkennzeichen BMBF 01LP1504A-D , Verbundnummer 01162215 , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden , Literaturangaben , Sprache der Kurzfassungen: Deutsch, Englisch

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GEOMAR KATALOG

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Teilvorhaben "Entwicklung von Vernetzungskonzepten, Verfahrensoptimierungen und Schulungsmaterialien" im Verbundprojekt "Pflege als Risiko - Wege zur Prävention und Verfolgung von Gewaltstraftaten gegenüber Pflegebedürftigen" (PaRis) : Schlussbericht : Laufzeit: 01.08.2019-31.12.2021 (2022)

Ackermann, Clara [VerfasserIn]

[Berlin] : Polizei Berlin

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Schlagwort(e): Forschungsbericht ; Pflegebedürftiger ; Misshandlung ; Vernachlässigung

Materialart: Online-Ressource

Seiten: 1 Online-Ressource (61 Seiten, 1,82 MB) , Diagramme

URL: https://doi.org/10.2314/KXP:1853914126

URL: https://edocs.tib.eu/files/e01fb23/1853914126.pdf

DOI: 10.2314/KXP:1853914126

Sprache: Deutsch

Anmerkung: Förderkennzeichen BMBF 13N15160 , Verbundnummer 01195291 , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden

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The other side of sea level change (2020)

Prange, Matthias ; Wilke, Thomas ; Wesselingh, Frank P. ; [weitere]

Nature Publishing Group UK

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Publikationsdatum: 2023-06-05

Beschreibung: Water levels in inland seas and lakes globally will drop, often dramatically, over the 21st century in response to climate change. Based on the case of the Caspian Sea, we argue for a concerted campaign to raise awareness of threats to people, biodiversity and geopolitical stability.

Beschreibung: EU Horizon 2020 Grant Ref Number 642973

Schlagwort(e): ddc:551.48 ; Climate-change impacts ; Ecosystem services ; Environmental impact ; Hydrology

Sprache: Englisch

Materialart: doc-type:article

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CITATION GEO-LEO

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Hypersensitivity of glacial summer temperatures in Siberia (2020)

Bakker, Pepijn ; Rogozhina, Irina ; Merkel, Ute ; [weitere]

Copernicus Publications (EGU)

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Publikationsdatum: 2023-02-08

Beschreibung: Climate change in Siberia is currently receiving a lot of attention because large permafrost-covered areas could provide a strong positive feedback to global warming through the release of carbon that has been sequestered there on glacial–interglacial timescales. Geological evidence and climate model experiments show that the Siberian region also played an exceptional role during glacial periods. The region that is currently known for its harsh cold climate did not experience major glaciations during the last ice age, including its severest stages around the Last Glacial Maximum (LGM). On the contrary, it is thought that glacial summer temperatures were comparable to the present day. However, evidence of glaciation has been found for several older glacial periods. We combine LGM experiments from the second and third phases of the Paleoclimate Modelling Intercomparison Project (PMIP2 and PMIP3) with sensitivity experiments using the Community Earth System Model (CESM). Together, these climate model experiments reveal that the intermodel spread in LGM summer temperatures in Siberia is much larger than in any other region of the globe and suggest that temperatures in Siberia are highly susceptible to changes in the imposed glacial boundary conditions, the included feedbacks and processes, and to the model physics of the different components of the climate model. We find that changes in the circumpolar atmospheric stationary wave pattern and associated northward heat transport drive strong local snow and vegetation feedbacks and that this combination explains the susceptibility of LGM summer temperatures in Siberia. This suggests that a small difference between two glacial periods in terms of climate, ice buildup or their respective evolution towards maximum glacial conditions can lead to strongly divergent summer temperatures in Siberia, allowing for the buildup of an ice sheet during some glacial periods, while during others, above-freezing summer temperatures preclude a multi-year snowpack from forming.

Materialart: Article , PeerReviewed

Format: text

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Radiocarbon Evidence for the Contribution of the Southern Indian Ocean to the Evolution of Atmospheric CO 2 Over the Last 32,000 Years (2020)

Ronge, Thomas A. ; Prange, Matthias ; Mollenhauer, Gesine ; [weitere]

AGU (American Geophysical Union)

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Publikationsdatum: 2023-02-08

Beschreibung: It is widely assumed that the ventilation of the Southern Ocean played a crucial role in driving glacial‐interglacial atmospheric CO2 levels. So far, however, ventilation records from the Indian sector of the Southern Ocean are widely missing. Here we present reconstructions of water residence times (depicted as ΔΔ14C and Δδ13C) for the last 32,000 years on sediment records from the Kerguelen Plateau and the Conrad Rise (~570‐ to 2,500‐m water depth), along with simulated changes in ocean stratification from a transient climate model experiment. Our data indicate that Circumpolar Deep Waters in the Indian Ocean were part of the glacial carbon pool. At our sites, close to or bathed by upwelling deep waters, we find two pulses of decreasing ΔΔ14C and δ13C values (~21–17 ka; ~15–12 ka). Both transient pulses precede a similar pattern in downstream intermediate waters in the tropical Indian Ocean as well as rising atmospheric CO2 values. These findings suggest that 14C‐depleted, CO2‐rich Circumpolar Deep Water from the Indian Ocean contributed to the rise in atmospheric CO2 during Heinrich Stadial 1 and also the Younger Dryas and that the southern Indian Ocean acted as a gateway for sequestered carbon to the atmosphere and tropical intermediate waters.

Materialart: Article , PeerReviewed

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Stability of the Atlantic overturning circulation under intermediate (MIS3) and full glacial (LGM) conditions and its relationship with Dansgaard-Oeschger climate variability (2020)

Zhang, Xiao ; Prange, Matthias

Elsevier

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Publikationsdatum: 2023-02-08

Beschreibung: Highlights: • Threshold behavior in AMOC stability as response to freshwater perturbations in different background climate conditions. • The AMOC was more stable to freshwater forcing under glacial conditions, e.g. LGM. • Millennial-scale Dansgaard–Oeschger-type climate variability suppressed due to more stable ocean circulation. Abstract: Paleoclimatic records reveal that millennial-scale climate variability during the Pleistocene was most pronounced during intermediate glacial conditions, like Marine Isotope Stage 3 (MIS3), rather than during interglacial and fully glaciated climates, like the Last Glacial Maximum (LGM). The rapid transitions between cold stadials and warm interstadials recorded in Greenland ice cores during MIS3, referred to as Dansgaard–Oeschger (D-O) events, have been correlated with millennial-scale climate variations worldwide. Although the origin of D-O events is a matter of controversy, striking evidence shows that variations in the strength of the Atlantic meridional overturning circulation (AMOC) were involved. Therefore, understanding the stability properties of the ocean circulation under different background climate conditions is key to understanding D-O millennial-scale climate variability. In the present study, the stability of the AMOC to northern high-latitude freshwater perturbations under MIS3 and LGM boundary conditions is investigated by using the coupled climate model CCSM3. Stability diagrams constructed from a large set of equilibrium experiments reveal a nonlinear dependence of AMOC strength on freshwater forcing under both MIS3 and LGM conditions. The MIS3 baseline state is close to an AMOC stability threshold, which makes the MIS3 climate unstable with respect to minor perturbations. A similar threshold behavior in AMOC stability is observed under LGM conditions; however, larger freshwater perturbations are necessary to pass the threshold and weaken the AMOC. The threshold’s displacement relative to the MIS3 background climate is attributable to differences in the atmospheric hydrologic cycle and North Atlantic sea ice transport. Different atmospheric moisture transports are attributable to thermodynamic and dynamic processes related to differences in greenhouse gas forcing and ice-sheet height between MIS3 and the LGM. We conclude that the higher stability of the AMOC during the LGM is a physically plausible explanation for millennial-scale D-O-type climate variability being suppressed under full glacial conditions, whereas minor perturbations in freshwater fluxes could have triggered D-O climate shifts during MIS3.

Materialart: Article , PeerReviewed

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Influence of the Atlantic Multidecadal Oscillation on South American Atmosphere Dynamics and Precipitation (2022)

Maksic, Jelena ; Shimizu, Marília H. ; Kayano, Mary T. ; [weitere]

MDPI

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Publikationsdatum: 2024-01-08

Beschreibung: The Atlantic Multidecadal Oscillation (AMO) is coherently linked to climate variations over many parts of the globe. Despite recent achievements, the mechanism by which the AMO influences regional precipitation over South America is not well understood. In this study, we isolate the atmospheric response to the AMO using a water isotope-enabled version of the Community Earth System Model version 1.2 (iCESM1.2) and determine its influence on (sub)tropical South American regional precipitation and atmospheric circulation. The results suggest an interhemispheric seesaw in Hadley circulation strength and that the section of the Atlantic Hadley cell is marked by a stronger upward air component south of the equator during the cold AMO phase. We also find that the precipitation anomalies over (sub)tropical South America during AMO phases are mainly related to changes in the Atlantic Intertropical Convergence Zone (ITCZ) core strength, where in the cold (warm) AMO phase the core region strengthens (weakens) from February to July, while from July to November the core region weakens (strengthens). Our results stress the importance of acknowledging the dynamics of season- and regional-dependent ITCZ responses, as they are sufficient to produce observed AMO-related signals even in the absence of marked changes in the ITCZ position.

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A multicentennial mode of North Atlantic climate variability throughout the Last Glacial Maximum (2023)

Prange, Matthias ; Jonkers, Lukas ; Merkel, Ute ; [weitere]

AAAS (American Association for the Advancement of Science)

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Publikationsdatum: 2024-02-07

Beschreibung: Paleoclimate proxy records from the North Atlantic region reveal substantially greater multicentennial temperature variability during the Last Glacial Maximum (LGM) compared to the current interglacial. As there was no obvious change in external forcing, causes for the increased variability remain unknown. Exploiting LGM simulations with a comprehensive coupled climate model along with high-resolution proxy records, we introduce an oscillatory mode of multicentennial variability, which is associated with moderate variations in the Atlantic meridional overturning circulation and depends on the large-scale salinity distribution. This self-sustained mode is amplified by sea-ice feedbacks and induces maximum surface temperature variability in the subpolar North Atlantic region. Characterized by a distinct climatic imprint and different dynamics, the multicentennial oscillation has to be distinguished from Dansgaard-Oeschger variability and emerges only under full LGM climate forcing. The potential of multicentennial modes of variability to emerge or disappear in response to changing climate forcing may have implications for future climate change.

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Last Interglacial decadal sea surface temperature variability in the eastern Mediterranean (2022)

Obreht, Igor ; De Vleeschouwer, David ; Wörmer, Lars ; [weitere]

Nature Research

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Publikationsdatum: 2024-02-07

Beschreibung: The Last Interglacial (~129,000–116,000 years ago) is the most recent geologic period with a warmer-than-present climate. Proxy-based temperature reconstructions from this interval can help contextualize natural climate variability in our currently warming world, especially if they can define changes on decadal timescales. Here, we established a ~4.800-year-long record of sea surface temperature (SST) variability from the eastern Mediterranean Sea at 1–4-year resolution by applying mass spectrometry imaging of long-chain alkenones to a finely laminated organic-matter-rich sapropel deposited during the Last Interglacial. We observe the highest amplitude of decadal variability in the early stage of sapropel deposition, plausibly due to reduced vertical mixing of the highly stratified water column. With the subsequent reorganization of oceanographic conditions in the later stage of sapropel deposition, when SST forcing resembled the modern situation, we observe that the maximum amplitude of reconstructed decadal variability did not exceed the range of the recent period of warming climate. The more gradual, centennial SST trends reveal that the maximal centennial scale SST increase in our Last Interglacial record is below the projected temperature warming in the twenty-first century.

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Changes in obliquity drive tree cover shifts in eastern tropical South America (2022)

Ferreira, Jaqueline Q. ; Chiessi, Cristiano M. ; Hirota, Marina ; [weitere]

Elsevier

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Publikationsdatum: 2024-02-07

Beschreibung: Despite its great ecological importance, the main factors governing tree cover in tropical savannas as well as savanna-forest boundaries are still largely unknown. Here we address this issue by investigating marine sediment records of long-chain n-alkane stable carbon (δ13Cwax) and hydrogen (δDwax) isotopes from a core collected off eastern tropical South America spanning the last ca. 45 thousand years. While δ13Cwax is a proxy for the main photosynthetic pathway of terrestrial vegetation, tracking the relative proportion of C3 (mainly trees) versus C4 (mainly grasses) plants, δDwax is a proxy for continental precipitation, tracking the intensity of rainfall. The investigated core was collected off the mouth of the São Francisco River drainage basin, a tropical savanna-dominated region with dry austral autumn, winter and spring. On top of millennial-scale changes, driven by anomalies in the amount of precipitation associated with Heinrich Stadials, we identify a marked obliquity control over the expansion and contraction of tree and grass cover. During periods of maximum (minimum) obliquity, trees (grasses) reached maximum coverage. We suggest that maximum (minimum) obliquity decreased (increased) the length of the dry season allowing (hampering) the expansion of tree-dominated vegetation. Periods of maximum obliquity induced an anomalous heating (cooling) of the summer (winter) hemisphere that in combination with a delayed response of the climate system slightly increased autumn precipitation over the São Francisco River drainage basin, through a shift of the Intertropical Convergence Zone towards or further into the anomalously heated hemisphere. We found that atmospheric CO2 concentration has only a secondary effect on tree cover. Our results underline the importance of the dry season length as a governing factor in the long-term control of tree cover in tropical landscapes.

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