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Observations on Astraeospongium meniscum (Roemer, 1948) from the Silurian of western Tennessee; constructional morphology and palaeobiology of the Astraeospongiidae (Calcarea, Heteractinellidae)
Mehl, Dorte;
(Berliner geowissenschaftliche Abhandlungen : Reihe E, 1996)
Astraeospongium is found to form secondary calcareous basal skeletons and thus may be attributed to the morphological grouping "coralline sponges". In A. meniscum, a bowl-shaped sponge with a massive skeleton of octactins, ... -
Observed and Simulated Variability of Droplet Spectral Dispersion in Convective Clouds Over the Amazon
; ; ; ; ; ; ; ; ; ; ; (Journal of Geophysical Research: Atmospheres, 2021-10-15)
In this study, the variability of the spectral dispersion of droplet size distributions (DSDs) in convective clouds is investigated. Analyses are based on aircraft measurements of growing cumuli near the Amazon basin, and ... -
Observed Subdecadal Variations of European Summer Temperatures
Müller, W.A.;; Ghosh, R. (Geophysical Research Letters, 2020)
We identify subdecadal variations in European summer temperatures in coupled and uncoupled century-long reanalyses. Spectral analyses reveal significant peaks at 5–10 years in the midtwentieth century. The subdecadal ... -
Observing Earth’s magnetic environment with the GRACE-FO mission
; ; ; ; ; ; ; (Earth, Planets and Space, 2021-02-15)
The Gravity Recovery and Climate Experiment Follow-On (GRACE-FO) mission carries magnetometers that are dedicated to enhance the satellite’s navigation. After appropriate calibration and characterisation of artificial ... -
Observing noctilucent clouds
(Internat. Assoc. of Geomagnetism & Aeronomy, 2006)This manual and instruction book was written by a group of active researchers, both professional and amateur. There are chapters giving practical advice for taking visual observations, photographing the clouds with film ... -
Ocean Bottom Pressure Variability: Can It Be Reliably Modeled?
Androsov, Alexey; Boebel, Olaf;; ; Macrander, Andreas; (Journal of Geophysical Research: Oceans, 2020)
Ocean bottom pressure (OBP) variability serves as a proxy of ocean mass variability, the knowledge of which is needed in geophysical applications. The question of how well it can be modeled by the present general ocean ... -
Ocean Heat Transport Into the Barents Sea: Distinct Controls on the Upward Trend and Interannual Variability
; ; ; ; ; ; ; ; ; (Geophysical Research Letters, 2019)
Ocean heat transport through the Barents Sea Opening (BSO) has strong impacts on the Barents Sea ice extent and the climate. In this paper we quantified the contributions from different atmospheric forcing components to ... -
Ocean Kinetic Energy Backscatter Parametrization on Unstructured Grids: Impact on Global Eddy-Permitting Simulations
;; ; ; (Journal of Advances in Modeling Earth Systems, 2020)
In this study we demonstrate the potential of a kinetic energy backscatter scheme for use in global ocean simulations. Ocean models commonly employ (bi)harmonic eddy viscosities causing excessive dissipation of kinetic ... -
Ocean Model Formulation Influences Transient Climate Response
; ; ; ; ; ; (Journal of Geophysical Research: Oceans, 2021-12-05)
The transient climate response (TCR) is 20% higher in the Alfred Wegener Institute Climate Model (AWI‐CM) compared to the Max Planck Institute Earth System Model (MPI‐ESM) whereas the equilibrium climate sensitivity (ECS) ... -
Ocean resurge-induced impact melt dynamics on the peak-ring of the Chicxulub impact structure, Mexico
; ; ;; ; ; ; ; (International Journal of Earth Sciences, 2021-03-18)
Core from Hole M0077 from IODP/ICDP Expedition 364 provides unprecedented evidence for the physical processes in effect during the interaction of impact melt with rock-debris-laden seawater, following a large meteorite ... -
Oceanic anoxic event (OAE) 1b - high resolution geochemical studies, Mazagan Plateau and the Vocontian Basin
(Univ. Köln, 2009)Während der Kreide wurden zahlreiche Störungen des globalen Kohlenstoffkreislaufes aufgezeichnet. Diese Störungen führten zu organisch reichen Ablagerungen, den sogenannten ozeanischen anoxischen Ereignissen (OAEs). Der ... -
Offshore Freshened Groundwater in Continental Margins
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; Martin‐Nagle, Renée; ; ; ; ; Trembath‐Reichert, Elizabeth; ; ; (Reviews of Geophysics, 2021-01-04)
First reported in the 1960s, offshore freshened groundwater (OFG) has now been documented in most continental margins around the world. In this review we compile a database documenting OFG occurrences and analyze it to ... -
ogs5py: A Python‐API for the OpenGeoSys 5 Scientific Modeling Package
Müller, Sebastian; Zech, Alraune; (Groundwater, 2020-06-16)
High‐performance numerical codes are an indispensable tool for hydrogeologists when modeling subsurface flow and transport systems. But as they are written in compiled languages, like C/C++ or Fortran, established software ... -
Oldest entirely preserved sponges and other fossils from the Lowermost Cambrian and a new facies reconstruction of the Yangtze platform (China)
Steiner, M.; Mehl, D.;; Erdtmann, B.-D. (1993)
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Oldest entirely preserved sponges and other fossils from the Lowermost Cambrian and a new facies reconstruction of the Yangtze platform (China)
Steiner, M.; Mehl, D.;; Erdtmann, B.-D. (Berliner geowissenschaftliche Abhandlungen, 1993)
Eine Faziesrekonstruktion W1d Korrelation obersinischer-unterkambrischer Schichten der Yangtze-Plattform (Südchina) wird vorgestellt. Dabei wird zwischen geschütztem Becken, Schwelle W1d tiefem Becken unterschieden. Die ... -
Oligocene emplacement of the Eclogite Zone of the central Tauern Window, Eastern Alps, Austria
Kühn, Alexander;; Ring, Uwe (11. Symposium "Tektonik, Struktur- und Kristallingeologie", 2006-03)
The EZ is an approximately 20km long and 2–3km wide coherent unit of the Tauern Window in the Eastern Alps. It is sandwiched between the Venedigerand the Glockner Nappe. While rocks in the EZ experienced HP metamorphic conditions ... -
Oligocene vegetation of Europe and western Asia—Diversity change and continental patterns reflected by plant functional types
; Erdei, Boglárka; François, Louis; Henrot, Alexandra-Jane; Mosbrugger, Volker; Popova, Svetlana (Geological Journal, 2020)
Spatial vegetation patterns potentially reflect coeval continental climate variations which are also impacted by palaeogeographical settings. Plant functional types (PFTs) and their distribution, frequently applied in ... -
Olivine aggregates reveal a complex collisional history of the main group pallasite parent body
; (Meteoritics & Planetary Science, 2022-04-08)
Olivine aggregates, bodies found in pallasites that consist of olivines with coherent grain boundaries and minor amounts of Fe‐Ni and troilite, likely represent well‐preserved samples of different mantle regions of pallasite ... -
On classification of logging data
(Univ. Clausthal, 2006)Die Erkennung stratigraphischer Einheiten innerhalb von marinen Sedimentablagerungen wird üblicherweise durch eine kombinierte Interpretation von Seismik-, Bohrlochsonden- und Kern-Daten vorgenommen. Im Falle von mehrdeutigen ... -
On gravity wave parameterisation in vicinity of low‐level blocking
(Atmospheric Science Letters, 2022-03-07)
This note is framed as an open question to the community regarding parameterisation schemes using the blocking layer depth to reduce the orographic gravity wave drag. It is the purpose of this note to argue that the current ...
