13 documents found

Dissertation

On the variability of turbulent mixing within the upper layers of the Atlantic...

Sea surface temperature (SST) variability within the equatorial Atlantic is of climatic relevance for the surrounding continents. A striking feature of this SST variability is the annual appearance of the Atlantic cold tongue (ACT). The respective contributions to the ML heat budget forming the seasonal...
Dissertation

Advanced Understanding of the Tropopause Inversion Layer: High-Resolution...

The upper troposphere and lower stratosphere (UTLS) is a region of the atmosphere that acts as a 'transition' between the two layers and consequently has properties from both. Within this region, a fine-scale feature is located: the Tropopause Inversion Layer (TIL), which consists of a sharp temperature...
Dissertation

Diapycnal and along isopycnal mixing, estimated from the tracer release...

A deliberate Guinea Upwelling Tracer Release Experiment (GUTRE) in 2008 - 2010 was used to study diapycnal mixing and lateral stirring in the thermocline of tropical northeastern Atlantic. The ultimate goal of this work was to investigate oxygen supply pathways at the upper boundary of North Atlantic...
Dissertation

North Atlantic multidecadal to centennial variability in a model and a...

Variability on decadal and longer timescales is of great interest in climate research due to it’s socio-economic impacts, potential for predictability and masking of anthroprogenic global warming. Observational evidence of multidecadal variability in the North Atlantic exists in the sea surface temperature...
Dissertation

Extratropical Sea Surface Temperature Impacts on Large-Scale Atmospheric...

Studying atmospheric response to extratropical North Pacific SST anomalies using observational and modelling analyses.
Dissertation

On the Dynamics and Predictability of the Atlantic Niño

This thesis seeks to broaden our understanding of the Atlantic Niño. The Atlantic Niño is the dominant mode of coupled interannual climate variability in the equatorial Atlantic. Its sea surface temperature (SST) signature is similar to the Pacific Niño, peaking in boreal summer, with a secondary Niño-like...
Dissertation

The importance of the representation of stratospheric dynamics and chemistry...

The stratosphere is attracting more and more attention for its potential to improve northern hemisphere (NH) seasonal weather forecasts, by modulating the North Atlantic Oscillation, or for its importance to reproduce observed southern hemisphere (SH) tropospheric jet trends, shaped by stratospheric...
Dissertation

The Influence of Ocean-Surface-Velocity-Dependent Wind Stress on the Dynamics...

This thesis examines the consequences of the ocean-surface-velocity dependence of the wind stress (SVD) for the dynamics of the Southern Ocean. It does so by comparing the output from eddying ocean-model experiments that only differ in the way the wind stress is parameterized. The thesis consists...
Dissertation

Oxygen Variability and Eddy-driven Meridional Oxygen Supply in the Tropical North...

The distribution of the mean oceanic oxygen concentration results from a balance between ventilation and consumption and, in particular, reveals extended oxygen minimum zones (OMZ) in the eastern tropical Pacific and Atlantic at intermediate depth (300m - 700m). It has been recently shown that OMZs...
Dissertation

Meso- and submesoscale variability within the Peruvian upwelling regime...

The role of meso- and submesoscale processes for the near-coastal circulation, physical and biogeochemical tracer distributions and oxygen minimum zone ventilation in the Peruvian upwelling regime is investigated in this thesis. A multi-platform four-dimensional observational experiment was carried out...
Dissertation

The Angola Current in a Tropical Seasonal Upwelling System : Seasonal Variability...

In this thesis, the flow and hydrographic characteristics of the boundary circulation off Angola are investigated, with particular emphasis on the mean properties and the seasonal cycle of the Angola Current. Moored velocity observations acquired at the Angolan shelf at 11°S between 2013 and 2016 reveal...
Dissertation

Simulation of Sea Level Variations in The Tropical Pacific Using A Linear...

The interannual sea level variability in the tropical Pacific is dominated by El Niño-Southern Oscillation (ENSO). In recent two decades, the increasing occurrence of Central Pacific ENSO (CP ENSO) contrasting with the classical Eastern Pacific ENSO (EP ENSO), termed with respect to the locations of...
Dissertation

The Role of Ocean-Atmosphere Interaction over the Gulf Stream SST-front...

This work deals with various aspects of the atmospheric response to mid-latitude SST fronts, in particular in the Gulf Stream region. It consists of three parts: In the first part the effect of enhanced model resolution on the correct representation of the processes in the frontal region is discussed,...