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  • 1
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    Multi-Sensor Analysis of the Spatial and Temporal Variability of Snow-Free Land Surface Albedo on Disko Island, Greenland
    In:  EPIC3
    Details
    Publication Date: 2024-04-26
    Description: Albedo – the reflectivity of a surface - is an important component in the energy budget, impacting the local to global climate. Data from nadir-viewing satellites can be combined with bidirectional reflectance distribution function (BRDF) data from multi-angular observation platforms to achieve realistic albedo values that acknowledge anisotropy. In my thesis, I evaluated how the land surface albedo varied on spatial and temporal scales during the snow-free period on Disko Island, Greenland. I examined how the albedo differed among the vegetation classes. Concerning the methodology, I assessed how the combination of MODIS BRDF data with Landsat 8 (L8) or Sentinel-2 (S2) influenced the albedo. The study area was located at the southern tip of Disko Island (69.27 °N, -53.47 °E) in West Greenland and covered a wetland and a range of tundra vegetation. I analysed automatic weather station (AWS) data from 2013 to 2022 and conducted mobile albedo measurements in August and September 2022 to examine the temporal and spatial variability. For the period from June to September 2022, I derived the L8 and S2 based albedo with inclusion of MODIS BRDF and narrow to broadband conversion and analysed their variability with regard to vegetation classes. In the snow-free period, the albedo increased from a monthly mean of 0.16 in June to 0.19 in September in the AWS data. The mobile measurements ranged from 〈 0.10 above bare soil and water to 〉 0.23 above areas dominated by lichen, Salix glauca or Equisetum arvense. The satellite-based albedo revealed temporally variable, significant correlations to normalised difference vegetation and moisture indices that reached values 〉 0.5 in the fen and wet heath class on several days. The albedo of shrubs was not notably smaller than other vegetation types but partly 0.01-0.05 above them in both the mobile measurements and the satellite-derived albedo. This finding challenges the assumption that shrubification causes climate forcing in all circumstances. The albedo of L8 and S2 differed to each other and the local data (root-mean-square error 0.04-0.14). The BRDF correction increased the albedo by 0.01 on average compared to nadir reflectance. L8 was better in reproducing the expected temporal and spatial variability of albedo than S2, which displayed less variability. S2 seemed to be more sensitive to atmospheric effects of haze and clouds influencing albedo. Thus, L8 seemed more suitable to calculate albedo in the study area. Though there were some methodological limitations, this thesis highlights aspects that should be considered when analysing albedo or jointly using L8 and S2 in high latitude regions.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Thesis , notRev
    Format: application/pdf
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  • 2
    Series available for loan
    Series available for loan
    Geologie von Jordanien (1968)
    Berlin [u.a.] : Borntraeger
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    Details Availability
    Call number: 9/SR 90.0077(7)
    In: Beiträge zur regionalen Geologie der Erde
    Type of Medium: Series available for loan
    Pages: XI, 230 S. + 4 Kt.-Beil., 2 Beil.
    Series Statement: Beiträge zur regionalen Geologie der Erde 7
    Language: German
    Location: Reading room
    Branch Library: GFZ Library
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  • 3
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    Moderne Methoden zur Bestimmung von Fischlarven (1990)
    Details
    Publication Date: 2024-04-25
    Description: Es wurden moderne Methoden auf ihre Eignung zur Bestimmung von Fischlarven untersucht. Als Vorbereitung auf die Bestimmung wurden Formen und proportionales Wachstum von Fischlarven der Nordsee und angrenzender Gebiete untersucht. Dazu wurden an 831 Fischlarven aus 33 Arten und 18 Familien die folgenden Messungen durchgeführt: Standardlänge, Präanallänge, Präorbitallänge, Präpektorallänge, Augendurchmesser, Orbitalhöhe, Pektoralhöhe, Analhöhe, Pektoralbreite und Analbreite. Aus den Messungen wurde das Volumen der Larven errechnet. Die Formen von Larven mit einem Volumen zwischen 3 und 5 μl wurden verglichen. Es ergaben sich vier deutlich getrennte Formgruppen: "eel-like", "fusiform", "deep + compressed" und "tadpole-like". Bis auf die Gruppe "fusiform" zeigten alle Gruppen allometrisches Wachstum bei bestimmten Körperproportionen. Die mögliche ökologische Bedeutung dieser Gruppen wird diskutiert. Es wurden drei computergestützte Bestimmungssysteme entwickelt und getestet: Ein numerisches System, ein Expertensystem und eine moderne Datenbank. Als Beispiel einer Methode der numerischen Taxonomie wurde die Quadratische Diskriminanzanalyse untersucht. Dazu wurden aus den durchgeführten Messungen die Diskriminanzfunktionen errechnet und unbekannte Larven zunächst einer Formgruppe und dann einer Art innerhalb der Formgruppe zugeordnet. Die richtige Zuordnung bei dieser Methode betrug 82 % . Die numerische Taxonomie scheint damit zur Bestimmung von Fischlarven grundsätzlich geeignet zu sein. Allerdings ist zweifelhaft, ob genügend Fischlarven (30 - 100 pro Art) zum Aufbau des Systems erhältlich sind. Aufbauend auf dem HALBEISEN-Schlüssel zur Bestimmung von Fischlarven der Nordsee und angrenzender Gebiete wurde das Expertensystem IDEXSYS entwickelt. Es kann als moderne Form traditioneller Bestimmungsschlüssel betrachtet werden. Expertensysteme erweisen sich damit als gut geeignet zur Bestimmung von Fischlarven. Mit einem modernen Datenbankprogramm wurde ein Such- und Eingabeformular mit etwa 80 Merkmalen entwickelt. Alle in der Nordsee und den angrenzenden Gebieten vorkommenden 126 Fischlarvenarten wurden auf diese Merkmale überprüft und in die Datenbank eingegeben. Der Test des Systems ergab, daß durchschnittlich nur drei Merkmale zur Bestimmung einer Fischlarve erforderlich waren. Bei einem Vergleich der Methoden wird für die Bestimmung von Fischlarven dem Datenbanksystem der Vorzug gegeben.
    Type: Thesis , NonPeerReviewed
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    Format: text
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  • 4
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    Development of an autonomous on-site dissolved inorganic carbon analyzer using conductometric detection (2024)
    Elsevier
    Details
    Publication Date: 2024-04-25
    Description: Highlights • Development of an autonomous DIC analyzer based on Conductometric technique using a cell with 4 hollow brass electrodes. • CO2 extraction from seawater using a gas diffusion cell with a “Tube In A Tube” configuration and a gas permeable membrane. • Formulation of mathematical temperature and salinity correction to determine accurate DIC concentration. • Demonstration of the analyzer performance in the southwest Baltic Sea. Abstract Background The increase in anthropogenic CO2 concentrations in the Earth's atmosphere since the industrial revolution has resulted in an increased uptake of CO2 by the oceans, leading to ocean acidification. Dissolved Inorganic Carbon (DIC) is one of the key variables to characterize the seawater carbonate system. High quality DIC observations at a high spatial-temporal resolution is required to improve our understanding of the marine carbonate system. To meet the requirements, autonomous DIC analyzers are needed which offer a high sampling frequency, are cost-effective and have a low reagent and power consumption. Results We present the development and validation of a novel analyzer for autonomous measurements of DIC in seawater using conductometric detection. The analyzer employs a gas diffusion sequential injection approach in a “Tube In A Tube” configuration that facilitates diffusion of gaseous CO2 from an acidified sample through a gas permeable membrane into a stream of an alkaline solution. The change in conductivity in the alkaline medium is proportional to the DIC concentration of the sample and is measured using a detection cell constructed of 4 hollow brass electrodes. Physical and chemical optimizations of the analyzer yielded a sampling frequency of 4 samples h−1 using sub mL reagent volumes for each measurement. Temperature and salinity effects on DIC measurements were mathematically corrected to increase accuracy. Analytical precision of ±4.9 μmol kg−1 and ±9.7 μmol kg−1 were achieved from measurements of a DIC reference material in the laboratory and during a field deployment in the southwest Baltic Sea, respectively. Significance This study describes a simple, cost-effective, autonomous, on-site benchtop DIC analyzer capable of measuring DIC in seawater at a high temporal resolution as a step towards an underwater DIC sensor. The analyzer is able to measure a wide range of DIC concentrations in both fresh and marine waters. The achieved accuracy and precision offer an excellent opportunity to employ the analyzer for ocean acidification studies and CO2 leakage detection in the context of Carbon Capture and Storage operations.
    Type: Article , PeerReviewed
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  • 5
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    Blue-Carbon-Potenziale der deutschen Nord- und Ostsee (2024)
    In:  Natur und Landschaft : Zeitschrift für Naturschutz und Landschaftspflege
    Details
    Publication Date: 2024-04-25
    Language: German
    Type: info:eu-repo/semantics/article
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  • 6
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    Bursting the Bubble? New Insights on Arctic Oil and Gas Resource Expectations in the Context of Global Change (2023)
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    Publication Date: 2024-04-25
    Language: English
    Type: info:eu-repo/semantics/other
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  • 7
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    Unsere Energiewende? Wie Beteiligung vor Ort die Transformation gestaltbar macht (2024)
    Das Progressive Zentrum e. V.
    Details
    Publication Date: 2024-04-25
    Description: Zentrale Aushandlungs- und Gestaltungsprozesse in der Energiewende finden vor Ort in den Regionen und Kommunen statt. Wie gelingt es hier, die Transformation demokratisch zu gestalten und das politische Versprechen von Teilhabe und Mitgestaltung einzulösen? Dieser Frage widmet sich die vorliegende Studie. Um herauszufinden, welche Erfolgsfaktoren und Herausforderungen in Ansätzen der finanziellen Beteiligung sowie in dialogischen und konfliktsensiblen Formaten liegen, haben wir drei unterschiedliche Fallbeispiele zu materieller und immaterieller Beteiligung in der Energiewende analysiert. Auf dieser Grundlage benennt die Studie fünf konkrete Handlungsempfehlungen zur Stärkung von kommunalen Transformationskapazitäten für Bund und Länder.
    Language: German
    Type: info:eu-repo/semantics/report
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  • 8
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    Geothermische Modelle für ein Profil zwischen Südadria und Tyrrhenis (1978)
    Reimer
    In:  Herausgeberexemplar
    Details
    Publication Date: 2024-04-25
    Description: Die Bestimmung der Temperaturverteilung in der Erdkruste und im oberen Erdmantel ist von großer Bedeutung für die Behandlung geotektonischer Probleme. In dieser Arbeit wird die Temperaturverteilung längs eines Profils in Süditalien untersucht, das vom Südadriatischen Meer durch Kalabrien zum Tyrrhenischen Meer verläuft. Grundlage für diese Untersuchung bilden eine Anzahl publizierter Wärmeflußwerte und ein refraktionsseismisches Profil. Längs des ausgewählten geothermischen Profils sind die Temperatur-Tiefen-Funktionen für zwei Modelle der Wärmeproduktionsverteilung, Schichten- und Exponential-Modell , für den stationären Zustand berechnet worden.
    Description: The determination of temperature distribution in the earth's crust and upper mantle is of great importance for geotectonic problems. The temperature distribution is discussed along a profile in southern Italy, which runs from the Adriatic to the Tyrrhenian Seas. This study is based on published heat flow values and seismic refraction data. The temperature-depth-functions are calculated for layer and exponential models for the heat production assuming a stationary state.
    Description: thesis
    Description: DFG, SUB Göttingen
    Keywords: ddc:550 ; Geophysik ; Geothermie
    Language: German
    Type: doc-type:book
    Format: 56
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  • 9
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    Improved understanding of vegetation dynamics and wetland ecohydrology via monthly UAV‐based classification (2023)
    John Wiley & Sons, Inc. | Hoboken, USA
    Details
    Publication Date: 2024-04-25
    Description: 〈title xmlns:mml="http://www.w3.org/1998/Math/MathML"〉Abstract〈/title〉〈p xmlns:mml="http://www.w3.org/1998/Math/MathML" xml:lang="en"〉Vegetation classification is an essential prerequisite for understanding vegetation‐water relations at a range of spatial scales. However, in site‐specific applications, such classifications were mostly based on a single Unmanned Aerial Vehicle (UAV) flight, which can be challenging in grasslands and/or herbaceous‐dominated systems, as those communities are small in size and highly mixed. Here, we conducted monthly UAV flights for two years in a riparian wetland in Germany, with acquired imagery used for vegetation classification on a monthly basis under different strategies (with or without auxiliary information from other flights) to increase understanding in ecohydrology. The results show that multi‐flight‐based classification outperformed single‐flight‐based classification due to the higher classification accuracy. Moreover, improved sensitivity of temporal changes in community distribution highlights the benefits of multi‐flight‐based classification ‐ providing a more comprehensive picture of community evolution. From reference to the monthly community distribution, we argue that a combination of two or three flights in early‐ and late‐summer is enough to achieve comparable results to monthly flights, while mid‐summer would be a better timing in case only one flight is scheduled. With such detailed vegetation mapping, we further interpreted the complex spatio‐temporal heterogeneity in NDVI and explored the dominant areas and developmental progress of each community. Impacts from management (mowing events) were also evaluated based on the different responses between communities in two years. Finally, we explored how such vegetation mapping could help understand landscape ecohydrology, and found that the spatio‐temporal distribution of minimal soil moisture was related to NDVI peaks of local community, while grass distribution was explained by both topography and low moisture conditions. Such bi‐directional relationships proved that apart from contributing to an evidence base for wetland management, multi‐flight UAV vegetation mapping could also provide fundamental insights into the ecohydrology of wetlands.〈/p〉
    Description: Chinese Scholarship Council (CSC)
    Description: Einstein Foundation Berlin and Berlin University Alliance
    Description: Leverhulme Trust http://dx.doi.org/10.13039/501100000275
    Keywords: ddc:551.48 ; ecohydrology ; remote sensed vegetation dynamics ; soil moisture ; UAV ; unmanned aerial vehicles ; wetlands
    Language: English
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  • 10
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    Rheology Dependent on the Distance to the Propagating Thrust Tip—(Ultra‐)Mylonites and Pseudotachylytes of the Silvretta Basal Thrust (2023)
    Details
    Publication Date: 2024-04-25
    Description: 〈title xmlns:mml="http://www.w3.org/1998/Math/MathML"〉Abstract〈/title〉〈p xmlns:mml="http://www.w3.org/1998/Math/MathML" xml:lang="en"〉To evaluate how the presence of pseudotachylytes affects the strength of crustal rocks, deformed pseudotachylytes and their relationship with pristine pseudotachylytes at the base of the Silvretta nappe are analyzed. Pseudotachylytes formed associated with high‐stress crystal plasticity (〈italic〉σ〈/italic〉〈sub〉〈italic〉d〈/italic〉〈/sub〉 > 400 MPa), as indicated by twinned amphiboles in gneisses. Mylonitic quartz clasts enclosed within deformed pseudotachylytes and mylonitic vein‐quartz, hosting folded pseudotachylyte injection veins, reflect creep at lower stresses (ca. 100 MPa) after seismic rupturing. Deformed pseudotachylytes can be crosscut by pristine pseudotachylytes, indicating a second, independent stage of coseismic rupturing after creep. The evidence of dynamic dislocation creep of quartz and the presence of stilpnomelane and epidote associated with all fault rocks indicate similar ambient greenschist facies conditions during all deformation stages. Whereas the intermediate stage of creep is interpreted to represent deformation at large distance to the propagating thrust tip, the pristine pseudotachylytes represent the last stage of rupturing eventually leading to nappe decoupling from its basement. Gneiss clasts in an ultramylonitic matrix (i.e., deformed pseudotachylyte) reveal that pseudotachylytes have a lower strength during creep in relation to the hosting gneisses. In contrast, during coseismic high‐stress crystal plasticity, the coarse gneisses accumulate a higher amount of strain. This strength‐relationship explains that only those rocks rupture, which have not been previously deformed before. The study demonstrates the importance of different strengths of crustal rocks at specific stress‐ and strain‐rate conditions in dependence on the distance to the propagating fault tip.〈/p〉
    Description: Key Points: 〈list list-type="bullet"〉 〈list-item〉 〈p xml:lang="en"〉Ultramylonites (deformed pseudotachylytes) and mylonites represent creep at large distance to the propagating thrust tip〈/p〉〈/list-item〉 〈list-item〉 〈p xml:lang="en"〉Pristine pseudotachylytes represent final deformation at the tip of the propagating thrust fault associated with nappe decoupling〈/p〉〈/list-item〉 〈list-item〉 〈p xml:lang="en"〉Pseudotachylytes are weak during aseismic creep and strong during coseismic high‐stress plasticity〈/p〉〈/list-item〉 〈/list〉 〈/p〉
    Description: Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659
    Description: https://doi.org/10.17632/xhh2ktks9g.4
    Description: https://nano.oxinst.com/products/aztec/
    Description: https://www.horiba.com/aut/scientific/products/detail/action/show/Product/labspec-6-spectroscopy-suite-software-1843/
    Keywords: ddc:551.8 ; (deformed) pseudotachylytes ; (ultra‐)mylonites ; creep ; multiple high‐stress events ; seismic cycle ; nappe decoupling
    Language: English
    Type: doc-type:article
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