Marlene Klockmann
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View article: Evaluating Dansgaard–Oeschger-like Oscillations in Climate Models: A Model-Data Comparison of MIS3 Variability
Evaluating Dansgaard–Oeschger-like Oscillations in Climate Models: A Model-Data Comparison of MIS3 Variability Open
A model-data comparison is an effective method for evaluating both proxy-based climate reconstructions and simulated model outputs. The MIS3 period is marked by a wide range of proxy records that indicate millennial-scale climate variabili…
Towards improved forecast initialisations with an observation-informed ocean grid Open
For climate forecasts it is crucial to initialise the ocean state from observations because they rely on the memory of the ocean. If, however, the initialised ocean state is far away from the model’s own preferred mean state, predictive sk…
The Impact of <i>CO</i> <sub>2</sub> and Climate State on Whether Dansgaard–Oeschger Type Oscillations Occur in Climate Models Open
Greenland ice core records feature Dansgaard–Oeschger (D‐O) events, which are abrupt warming episodes followed by gradual cooling during ice age climate. The three climate models used in this study (CCSM4, MPI‐ESM, and HadCM3) show spontan…
View article: A multi-model analysis of the PMIP LGM AMOC
A multi-model analysis of the PMIP LGM AMOC Open
Simulating and reproducing the past Atlantic meridional overturning circulation (AMOC) with comprehensive climate models are essential to test the ability of models to simulate different climates. At the Last Glacial Maximum (LGM), reconst…
Spontaneous Dansgaard–Oeschger type oscillations in three models: the impact of CO2 Open
Greenland ice core records feature Dansgaard–Oeschger (D-O) events, which are abrupt warming episodes followed by gradual cooling during ice age climate. The three climate models used in this study (CCSM4, MPI-ESM, and HadCM3) show spontan…
View article: Towards variance-conserving reconstructions of climate indices with Gaussian process regression in an embedding space
Towards variance-conserving reconstructions of climate indices with Gaussian process regression in an embedding space Open
We present a new framework for the reconstruction of climate indices based on proxy data such as tree rings. The framework is based on the supervised learning method Gaussian Process Regression (GPR) and aims at preserving the amplitude of…
Comment on cp-2023-82 Open
Abstract. Variations of the Atlantic Meridional Overturning Circulation (AMOC) are associated with Northern Hemispheric and global climate shifts. Thermal thresholds of the AMOC have been found in a hierarchy of numerical circulation model…
View article: ABRUPT Arctic Climate Change
ABRUPT Arctic Climate Change Open
At unprecedented resolution we investigate the nature of Dansgaard-Oeschger events in the Fram Strait, the gateway between the Nordic Seas and the Arctic Ocean. The new reconstructions of biomarkers and sea ice variability, stable isotopes…
Mechanisms behind ocean variability in transient simulations of the early deglaciation Open
The last deglaciation was accompanied by a gradual warming with superimposed abrupt climate changes. In transient simulations of the last deglaciation with the comprehensive Max Planck Institute Earth System Model (MPI-ESM) we show that th…
Evaluation of statistical climate reconstruction methods based on pseudoproxy experiments using linear and machine-learning methods Open
Three different climate field reconstruction (CFR) methods are employed to reconstruct spatially resolved North Atlantic–European (NAE) and Northern Hemisphere (NH) summer temperatures over the past millennium from proxy records. These are…
Comment on gmd-2022-32 Open
We present a new framework for the reconstruction of climate indices based on proxy data such as tree rings. The framework is based on the supervised learning method Gaussian Process Regression (GPR) and designed to preserve the amplitude …
Comment on gmd-2022-32 Open
We present a new framework for the reconstruction of climate indices based on proxy data such as tree rings. The framework is based on the supervised learning method Gaussian Process Regression (GPR) and designed to preserve the amplitude …
Towards variance-conserving reconstructions of climate indices with Gaussian Process Regression in an embedding space Open
We present a new framework for the reconstruction of climate indices based on proxy data such as tree rings. The framework is based on the supervised learning method Gaussian Process Regression (GPR) and designed to preserve the amplitude …
Comment on cp-2022-5 Open
Three different climate field reconstruction (CFR) methods employed to reconstruct North Atlantic-European (NAE) and Northern Hemisphere (NH) summer season temperature over the past millennium from proxy records are tested in the framework…
Drivers of LGM AMOC change from PMIP2 to PMIP4 Open
Understanding the response of the Atlantic Meridional Overturning Circulation (AMOC) to different climate conditions is a crucial part of understanding the climate system. Proxy-based reconstructions suggested that the AMOC during the Last…
Evaluation of statistical climate reconstruction methods based on pseudoproxy experiments using linear and machine learning methods Open
Three different climate field reconstruction (CFR) methods employed to reconstruct North Atlantic-European (NAE) and Northern Hemisphere (NH) summer season temperature over the past millennium from proxy records are tested in the framework…
Different ice sheets – different AMOC? Revisiting the ice-sheet effect on the LGM AMOC Open
Coupled climate models have produced very different states of the Atlantic Meridional Overturning Circulation (AMOC) in simulations of the Last Glacial Maximum (LGM). In particular, many of them failed to capture the shoaling of the upper …
Gaussian Process Regression – A tool for improved climate index reconstructions Open
We present a flexible non-linear framework of Gaussian Process Regression (GPR) for the reconstruction of past climate indexes such as the Atlantic Multidecadal Variability (AMV). These reconstructions are needed because the historical obs…
Coupling of the Subpolar Gyre and the Overturning Circulation During Abrupt Glacial Climate Transitions Open
We present a mechanism for self‐sustained ocean circulation changes that cause abrupt temperature changes over Greenland in a multimillennial climate model simulation with glacial CO 2 concentrations representative of Marine Isotope Stage …
Satellite-Driven Estimates of Water Mass Formation and Their Spatio-Temporal Evolution Open
We derive water mass transformation and formation rates using satellite-derived datasets of salinity, temperature and fluxes of heat and freshwater over the North Atlantic, North Pacific and Southern Ocean. The formation rates are expresse…
Heinrich events show two-stage climate response in transient glacial simulations Open
Heinrich events are among the dominant modes of glacial climate variability. During these events, massive iceberg armadas were released by the Laurentide Ice Sheet and sailed across the Atlantic where they melted and released freshwater, a…
View article: Second Data Science Symposium at AWI
Second Data Science Symposium at AWI Open
The second Data Science Symposium at AWI gathered several data science related talks from AWI, GEOMAR and HZG.
Diving into the Past: A Paleo Data–Model Comparison Workshop on the Late Glacial and Holocene Open
© 2019 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).CORRESPONDING AUTHOR: Oliver Bothe, oliver.both…
Two AMOC States in Response to Decreasing Greenhouse Gas Concentrations in the Coupled Climate Model MPI-ESM Open
This study analyzes the response of the Atlantic meridional overturning circulation (AMOC) to different CO 2 concentrations and two ice sheet configurations in simulations with the coupled climate model MPI-ESM. With preindustrial (PI) ice…
Heinrich events show two-stage climate response in transient glacial simulations Open
Heinrich events are among the dominant modes of glacial climate variability. During these events, massive iceberg armadas were released by the Laurentide Ice Sheet, sailed across the Atlantic, and caused large-scale climate changes. We stu…
The AMOC and its sensitivity to different climate forcings in the range of glacial to modern conditions Open
State-of-the-art coupled climate models produce very different states of the Atlantic Meridional Overturning Circulation (AMOC) in simulations of the Last Glacial Maximum (LGM). In particular, many of them fail to capture the shoaling of t…
The effect of greenhouse gas concentrations and ice sheets on the glacial AMOC in a coupled climate model Open
Simulations with the Max Planck Institute Earth System Model (MPI-ESM) are used to study the sensitivity of the AMOC and the deep-ocean water masses during the Last Glacial Maximum to different sets of forcings. Analysing the individual co…
Comments on &#8220;The effect of greenhouse gas concentrations and ice sheets on the glacial AMOC in a coupled climate model&#8221; by Marlene Klockmann, Uwe Mikolajewicz, and Jochem Marotzke. Open
By using the coarse resolution version of the Max Plank Institute Earth System Model (MPI-ESM), the authors investigated the response of the AMOC and deep ocean water masses to glacial forcing.The authors' sensitivity simulations clearly d…