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Gronholz, Alexandra

Archived Page

This web page has not been updated since the former colleague left MARUM.

Project

My PhD project 'Investigating ocean processes by the use of a regional coupled ocean-atmosphere and a trajectory model' is integrated into the International Research Training Group INTERCOAST - ‘Integrated Coastal Zone and Shelf-Sea Research’, which is a collaboration between the Universities of Bremen (Germany) and Waikato (New Zealand).

In the framework of this project I set up a new regional coupled ocean-atmosphere system for the North Sea region by the use of the Coupled Ocean-Atmosphere-Wave-Sediment Transport system (COAWST, Warner et al., 2008). This system includes the Regional Ocean Modeling System (ROMS) as ocean component and the Weather Research and Forecasting (WRF) model to represent the atmosphere. The coupled ocean-atmosphere system is applied to investigate strong extreme storm events, as possibly increasing in future due to anticipated climate changes, and their impacts on ocean stratification. This is done by calculating and analysing in detail the impact of single physical processes leading to ocean (de-)stratification, such as vertical mixing, advection, straining and heat fluxes.
For the New Zealand region, I use the trajectory model TracPy, driven by ROMS velocity fields, as tool to investigate distribution pattern in the ocean as well as the formation of the so-called Southland Current.

Education

2009 - 2011	Master study program 'Physical Oceanography' at the University of Hamburg, Germany
2005 - 2009	Bachelor study program 'Environmental Science' at the University of Oldenburg, Germany

Publications

Gronholz, A., Gräwe, U., Paul, A. and Schulz, M., 2016. Investigating the effects of a summer storm on the North Sea stratification using a regional coupled ocean - atmosphere model. Ocean Dynamics (submitted)
Gronholz, A., Hadfield, M., Paul, A. and Schulz, M., 2016. Formation of the Southland Current, New Zealand – a trajectory analysis. Deep-Sea Research Part I (submitted)

Workshop proceedings

Gronholz, A., Paul, A. and Schulz, M., 2014. Assessing environmental changes and risks using a regional coupled ocean – atmosphere – sediment model. International Baltic Earth Secretariat Publication No. 3, 21st Century Challenges in Regional Climate Modelling (pp. 24-25), Geesthacht, Germany, ISSN:2198-4247

Conference and workshop presentations

Gronholz, A., Paul, A. and Schulz, M., August 2014. Application of the COAWST - system for the North Sea (Europe). COWAST Users Workshop, Massachusetts, USA (oral presentation)

Gronholz, A., Paul, A. and Schulz, M., June 2014. Wind-induced coastal changes - An application of a Coupled Ocean – Atmosphere – Wave – Sediment Transport (COAWST) system. 21St Century Challenges in Regional Climate Modelling, Lund, Sweden (poster presentation)

Gronholz, A., Paul and Schulz, M., May 2014. Application of a Coupled Ocean – atmosphere – Wave – Sediment Transport (COAWST) system to assess wind-induced coastal changes. ROMS/TOMS Users Workshop, Rovinj, Croatia (poster presentation)

Gronholz, A., Paul, A. and Schulz, M., December 2013. Assessing environmental changes and risks using a regional coupled ocean – atmosphere – sediment model. KLIWAS Meeting, Hamburg, Germany (oral presentation)

Gronholz, A., Paul, A. and Schulz, M., November 2013. Assessing environmental changes and risks using a regional coupled ocean – atmosphere – sediment model. CEN/CLISAP/ECRA Workshop/WCRP High-end scenarios of regional sea level changes and their uncertainties, Hamburg, Germany (poster presentation)

Further experiences

Research stay at the National Institute of Water and Atmosphere (NIWA, Wellington, New Zealand), March 2014 - October 2014

Weddell Sea expedition, ANT-XXIV/3, R.V. Polarstern, 6 Februar 2008 - 16 April 2008, Cape Town (South Africa) - Punta Arenas (Chile)