You are here: Home page » Team

Hannah Nowitzki

Tel: +49 (0) 421 218 - 62156
Fax: +49 (0) 421 218 - 62165
Email: h.nowitzki [at] uni-bremen.de

Research Interests

Circulation variability in the subpolar North Atlantic

PhD project
The PhD project is part of the project HB-05 “Transport variability of volume, heat, and salinity from the subtropics and its impact on basal glacial melt” within the framework of the International Research Training Group ArcTrain “Processes and impacts of climate change in the North Atlantic Ocean and the Canadian Arctic”. The North Atlantic is one of the major climate relevant regions and of special interest in the context of climate change. The North Atlantic Current (NAC) transports warm and saline water from the subtropics into the subpolar North Atlantic and partly provides thus the energy for the recent melt of the Greenland Ice sheets. Within the subpolar North Atlantic, deep water formation takes place leading to a southward flow of cold and dense water. As a part of the meridional overturning circulation, the NAC and its pathways within the North Atlantic as well as the southward flow of the deep water masses are closely linked to the global climate. The PhD project aims at quantifying the transport of water masses throughout the 47°N transect within the North Atlantic with a focus on the eastern basin. Time series from PIES (pressure sensor equipped inverted echo sounders) are be combined with satellite altimetry data in order to study the pathways of the circulation as well as transports and sea surface height variability. The results of the analysis will be combined with a high resolution numerical ocean model to further study the involved processes and mechanisms leading to changes in the warm water circulation and the oceanic heat transport.

PhD project

The PhD project is part of the project HB-05 “Transport variability of volume, heat, and salinity from the subtropics and its impact on basal glacial melt” within the framework of the International Research Training Group ArcTrain “Processes and impacts of climate change in the North Atlantic Ocean and the Canadian Arctic”.

The North Atlantic is one of the major climate relevant regions and of special interest in the context of climate change. The North Atlantic Current (NAC) transports warm and saline water from the subtropics into the subpolar North Atlantic and partly provides thus the energy for the recent melt of the Greenland Ice sheets. Within the subpolar North Atlantic, deep water formation takes place leading to a southward flow of cold and dense water. As a part of the meridional overturning circulation, the NAC and its pathways within the North Atlantic as well as the southward flow of the deep water masses are closely linked to the global climate.

The PhD project aims at quantifying the transport of water masses throughout the 47°N transect within the North Atlantic with a focus on the eastern basin. Time series from PIES (pressure sensor equipped inverted echo sounders) are be combined with satellite altimetry data in order to study the pathways of the circulation as well as transports and sea surface height variability. The results of the analysis will be combined with a high resolution numerical ocean model to further study the involved processes and mechanisms leading to changes in the warm water circulation and the oceanic heat transport.

Curriculum Vitae
since 10/2016	PhD student Institute of Environmental Physics and MARUM – Center for Marine Environmental Sciences, University of Bremen, Germany
10/2015 - 09/2016	Radiation protection services, Ev. Krankenhaus Bielefeld
04/2013 - 07/2015	Studies in Physics, University of Heidelberg, Degree: M.Sc.
09/2012 - 03/2013	Studies in Physics, University of Gothenburg, Sweden
10/2009 - 08/2012	Studies in Physics, University of Marburg, Degree: B.Sc.

Poster
Nowitzki, H., M. Rhein, D. Kieke, A. Roessler (2019), "Transport and sea surface height variability of the North Atlantic Current studied with observational data from pressure sensor equipped inverted echo sounders", EGU General Assembly 2019, Vienna, Austria
Nowitzki, H., M. Rhein, A. Roessler, D. Kieke (2017), "Variability of the North Atlantic Current: A comparison of satellite altimetry and observational data from PIES", EGU General Assembly 2017, Vienna, Austria
Nowitzki, H., M. Rhein, A. Roessler, D. Kieke (2017), "Variability of transport and pathways of the North Atlantic Current: A comparison of satellite altimetry and observational data from pressure inverted echo sounders", DPG Spring Meeting 2017, Bremen, Germany
Nowitzki, H., N. Frank, J. Fohlmeister (2015), "Conceptual model: possible changes of the seawater uranium isotopic composition through time", DPG Spring Meeting 2015, Heidelberg, Germany
Nowitzki, H., N. Frank (2014), "Possible changes of the seawater uranium isotopic composition through time", DPG Summer School "Physics of the Ocean", Bad Honnef, Germany

Presentations
Nowitzki, H., M. Rhein, A. Roessler, D. Kieke (2018), “Using Argo data for PIES data analysis”, Argo User Meeting, Hamburg, Germany
Nowitzki, H., M. Rhein, A. Roessler, D. Kieke (2018), "An estimate of AMOC related transports at 47°N in the eastern North Atlantic inferred from PIES data", Ocean Sciences Meeting 2018, Portland, U.S.

Projects
since 10/2016	Member of the international Research Training Group ArcTrain
since 10/2016	Member of the Bremen International Graduate School for Marine Sciences GLOMAR

Scientific Cruises
April - May 2018, FS Maria S. Merian, MSM-73, Subpolar North Atlantic (Cádiz, Spain – St. John’s, Canada), PI: Dagmar Kieke
May - June 2017, FS Maria S. Merian, MSM-64, Subpolar North Atlantic (Southhampton/UK - St. John's/Canada), PI: Dagmar Kieke

Publications
Nowitzki, H., M. Rhein, A. Roessler, D. Kieke, and C. Mertens (2021), Trends and transport variability of the circulation in the subpolar eastern North Atlantic. J. Geophys. Res.: Oceans, 126, e2020JC016693, doi:10.1029/2020JC016693.
Kieke, D, K. Altona, A. Buinyi, C. dos Santos Ferreira, L. Frahm, Y. Garcia Quintana, J. Gerken, A. Gerriets, A. Herland, S. Kinne, M. Köllner, S. Küper, G. Martinez-Mendez, B. Mirau, H. Nowitzki, C. Pennelly, M. Retsch, A. Roessler, A. Schneehorst, R. Steinfeldt, G. Stokland, P. Sültenfuß, H.-H. Uhde, and F. Wischnewski (2019), Transport Measurements across 47°N in the North Atlantic, Cruise No. MSM64, May 27 - June 23, 2017, Southampton (Germany) - Galway (Ireland) - St. John's (Canada). MARIA S. MERIAN-Berichte, doi:10.2312/cr_msm64.
Kieke, D, R. Arruda Monteiro da Silva, K. Bulsiewicz, K. Azetsu-Scott, N. Binnemann, A. Buinyi, C. Feucher, O. Huhn, M. Köllner, H. Nowitzki, J. Oelsmann, A. Röhler, N. Rohlfs, A. Schneehorst, R. Steinfeldt, H.-H. Uhde, K. Wiegand, and F. Wischnewski (2019), Subpolar Gyre Variability, Cruise No. MSM73, April 06 - May 22, 2018, Cadiz (Spain) - St. John's (Canada). MARIA S. MERIAN-Berichte, doi:10.2312/cr_msm73.
Nowitzki, H. (2015), "Evolution of the Seawater Uranium Isotopic Composition through Time", Universität Heidelberg, Master-Thesis

printer friendly page