Michael Schulz

University of Bremen

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Co-Authors

Matthias Prange

University of Bremen

145

Stefan Mulitza

University of Bremen

André Paul

University of Bremen

Michal Kučera

University of Bremen

Ute Merkel

University of Bremen

Enno Schefuß

University of Bremen

David Heslop

Australian National University

Ralf Tiedemann

Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung

Matthias Zabel

University of Bremen

Henning Kuhnert

University of Bremen

Cooperative Institutions

University of Bremen

130

Centre National de la Recherche Scientifique

Kiel University

Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung

Universität Hamburg

Max Planck Institute for Meteorology

Laboratoire des Sciences du Climat et de l'Environnement

GEOMAR Helmholtz Centre for Ocean Research Kiel

University of Bern

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

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Holocene Climate Variability on Centennial-to-Millennial Time Scales: 1. Climate Records from the North-Atlantic Realm

Springer eBooks (2002)

Michael Schulz André Paul

Ice core

Climate state

Paleoclimatology

Climate system

Temperature record

Abrupt climate change

10.1007/978-3-662-04965-5_4

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Citations (114)

Holocene evolution of the Southern Hemisphere westerly winds in transient simulations with global climate models

Climate of the past (2012)

Vidya Varma Matthias Prange Ute Merkel Thomas Kleinen Gerrit Lohmann

Abstract. The Southern Hemisphere Westerly Winds (SWW) have been suggested to exert a critical influence on global climate through the wind-driven upwelling of deep water in the Southern Ocean and the potentially resulting atmospheric CO2 variations. The investigation of the temporal and spatial evolution of the SWW along with forcings and feedbacks remains a significant challenge in climate research. In this study, the evolution of the SWW under orbital forcing from the mid-Holocene (7 kyr BP) to pre-industrial modern times (250 yr BP) is examined with transient experiments using the comprehensive coupled global climate model CCSM3. In addition, a model inter-comparison is carried out using orbitally forced Holocene transient simulations from four other coupled global climate models. Analyses and comparison of the model results suggest that the annual and seasonal mean SWW were subject to an overall strengthening and poleward shifting trend during the course of the mid-to-late Holocene under the influence of orbital forcing, except for the austral spring season, where the SWW exhibited an opposite trend of shifting towards the equator.

Westerlies

Forcing (mathematics)

Orbital forcing

Climate state

10.5194/cp-8-391-2012

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Citations (71)

On the Creep Rupture Prediction of Composite Pressure Vessels

Michael Schulz

This article illustrates a concept of predicting the time dependent deformation and creep rupture strength of carbon fibre reinforced plastics (CFRP). In the presented concept the viscoelastic behaviour of the resin is determined by creep rupture tests at different temperature and load levels. Out of the experiments the relaxation spectrum of the resin is modelled including the spread. With the help of the classical rule of mixture and a modified classical laminate theory the minimum strain rate for the composite will be determined. The results will be compared to experimental data. Furthermore the Monkman-Grant approach is used to determine the time-to-failure strain-rate relation. Therefore an elastic solution of the classical laminate theory is used including Puck’s failure criteria to compute the Monkman-Grant relation. A Monte Carlo Simulation will be done to include the spread of the Monkman-Grant relation. The results will be compared to experimental results of unidirectional specimens. Finally it will be explained how the lifetime of a pressure vessel can be computed using the explained concept.

Stress relaxation

10.1115/pvp2010-26034

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Citations (0)

Raw data and interpolated raw data from proxy records of sediment core GeoB6007-1

Audrey Morley Michael Schulz Yair Rosenthal Stefan Mulitza André Paul

Sediment core

Proxy (statistics)

10.1594/pangaea.770708

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Citations (0)

A forward and inverse transformation program for the “Atlas of Lithological-Paleogeographical Maps of the World”

Computers & Geosciences (1995)

Michael Schulz Christopher N. Wold A. B. Ronov William W. Hay

Map projection

ASCII

Longitude

Geographic coordinate system

10.1016/0098-3004(95)00024-3

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Citations (3)

Major element data for tropical western Africa for samples from the Last Glacial Maximum, Heinrich Stadial 1, the mid-Holocene and the late Holocene

James A Collins Enno Schefuß David Heslop Stefan Mulitza Matthias Prange

Stadial

10.1594/pangaea.757398

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Citations (0)

Fundamental Modes and Abrupt Changes in North Atlantic Circulation and Climate over the last 60 ky — Concepts, Reconstruction and Numerical Modeling

Springer eBooks (2001)

Michael Sarnthein Karl Stattegger Derek Dreger Helmut Erlenkeuser Pieter Meiert Grootes

Meltwater

Gulf Stream

paleoceanography

10.1007/978-3-642-56876-3_21

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Citations (218)

Synchronous and proportional deglacial changes in Atlantic meridional overturning and northeast Brazilian precipitation

Paleoceanography (2017)

Stefan Mulitza Cristiano Mazur Chiessi Enno Schefuß Jörg Lippold David Wichmann

Abstract Changes in heat transport associated with fluctuations in the strength of the Atlantic meridional overturning circulation (AMOC) are widely considered to affect the position of the Intertropical Convergence Zone (ITCZ), but the temporal immediacy of this teleconnection has to date not been resolved. Based on a high‐resolution marine sediment sequence over the last deglaciation, we provide evidence for a synchronous and near‐linear link between changes in the Atlantic interhemispheric sea surface temperature difference and continental precipitation over northeast Brazil. The tight coupling between AMOC strength, sea surface temperature difference, and precipitation changes over northeast Brazil unambiguously points to a rapid and proportional adjustment of the ITCZ location to past changes in the Atlantic meridional heat transport.

Intertropical Convergence Zone

Deglaciation

Teleconnection

Tropical Atlantic

10.1002/2017pa003084

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Citations (133)

Effect of preservation state of planktonic foraminifera tests on the decrease in Mg/Ca due to reductive cleaning and on sample loss during cleaning

Chemical Geology (2015)

Heather Johnstone William T. Lee Michael Schulz

Globigerinoides

10.1016/j.chemgeo.2015.10.045

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Citations (19)

A purpose-built simulator for percutaneous ultrasound-guided renal biopsy

Clinical Nephrology (2012)

Alexander Woywodt Thien How Michael Schulz

To construct a simple and affordable simulator for ultrasoundguided percutaneous renal biopsy.The kidney biopsy phantom was constructed by embedding a porcine kidney in gelatine. Silicon carbide and aluminium oxide were used as scattering particles in order to mimic the ultrasound appearance of human tissues. Two porcine ribs were also embedded. A latex sheet was placed over the top of the gel layer to resemble skin. The simulator was used and feedback from participants obtained during a renal ultrasound course with an international audience of middle-grade trainees from adult and pediatric nephrology, many of whom had never done a renal biopsy. Biopsy was carried out a single-use biopsy gun.All participants were able to perform a biopsy and obtain a satisfactory sample. All trainees felt that our simulator was very realistic. 94% of participants agreed that the simulator would help to allay their fears in relation to renal biopsy The total cost of the simulator was around £ 50,- for consumables per simulator.We describe a purpose-built and affordable simulator for percutaneous ultrasound-guided renal biopsy. We suggest that others evaluate our simulator used as part of a structured approach to teach this important procedure.

Nephrology

10.5414/cn107236

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Citations (8)