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Prof. Dr. Stefan Emeis

Prof. Dr. Stefan Emeis

Senior scientist (meteorologist)
group: Regional Coupling of Ecosystem-Atmosphere Processes
room: 265
phone: +49 8821 183 240
fax: +49 8821 73 5 73
stefan emeisSPAM∂kit edu
More than 50 % of mankind is living in cities. Urban research has high societal relevance. Therefore, my research puts a major emphasis on studies of the urban atmospheric boundary layer. A second subject is boundary layer research for wind energy.
New York (c) Stefan Emeis
reactor vessel city (c) Stefan Emeis
reaction vessel city

Research subjects:


 

Living conditions in cities are determined - from an atmospheric point of view - by the urban heat island and urban-rural interactions. Urban areas can be seen as a sort of 'reaction vessel' within which atmospheric compounds from biogenic and anthropogenic emissions are mixed, processed under the specific conditions of urban areas, and then exported to the surroundings. Ingestion of substances from the rural environment and export into the surrounding atmosphere is supported by a thermally driven secondary circulation system which is due to the urban heat island. Atmospheric boundary layer research based on measurements and numerical simulations is necessary to understand the processes happening in this 'reaction vessel'. This understanding is the prerequisite for adaptation and mitigation measures in order to safeguard meaningful and sustainable living conditions in cities in the coming years.

 

Topics in detail:

 

Influence of atmospheric boundary layer (ABL) wind, turbulence, and stratification on urban living conditions, air quality, and wind energy


Remote sensing of the structure of the ABL with surface-based acoustic and optical instruments (Sodar, Ceilometer, RASS, windlidar), see Open Access paper Emeis et al. (2009)


Vertical structure of the urban boundary layer and turbulent fluxes in urban heat islands


Determination of the mixing layer height (e.g. for the determination of regional and diffuse emission strengths), see Open Access paper Emeis et al. (2008)

 

Low-level jets, see Emeis (2014)


Vertical structure of the marine boundary layer (meteorological basics for wind energy), see, e.g., Emeis and Türk (2009), Türk and Emeis (2010), Foreman and Emeis (2010), Emeis (2010), Emeis (2014)


 

Current and recent projects:

 

WINSENT funded by the German Ministry for Economic Affairs (ongoing, December 2016 to May 2020): Realisation of a wind energy test site in  complex terrain, numerical simulation of flow conditions at the test site.

 

Urban Climate Under Change, Module B Three-dimensional Observation of Atmospheric Processes in Cities (3DO) funded by the German Ministry for Education and Research (ongoing, June 2016 to May 2019): ground-based remote sensing by wind lidars and ceilometers in Stuttgart in order to capture data for urban climate model evaluation.

 

WIPAFF (WIndPArk Far Field) funded by the German Ministry for Economic Affairs (ongoing, November 2015 to October 2018): Numerical modelling of long wakes behind entire offshore wind parks in the North Sea (together with partners from the University of Braunschweig (Do 128 aircraft operations to measure long wakes), Helmholtz Centre Geesthacht (SAR satellite imagery of wakes), UL DEWI (modelling and in situ observations) and University of Tübingen (analysis of turbulence)).

 

KonTest funded by the German Ministry for Economic Affairs (completed, November 2013 to October 2015): Preparation of a concept for a wind energy test site in complex terrain.

 

UHI (Urban Heat Island) funded by Central Europe Adaptation and mitigation strategies for urban heat islands, in cooperation with the township of Stuttgart (completed, May 2011 to July 2014)

 

TERENO: (Terrestrial Environmental Observatories), long-term investigation of consequences of Global Change for terrestrial ecosystems and the socioeconomic implications, member of Coordination team "Atmosphere" (CT Atmosphere), special interests: influence of mixing-layer height on turbulent flux measurements, ground-based remote sensing of mixing-layer height (ongoing)

 

TUFFO: Erfassung und Bewertung des Einflusses turbulenter Feuchteflüsse auf die Turbulenz in Offshore Windparks (Assessment and evaluation of the impact of turbulent humidity fluxes on turbulence in offshore wind farms) (completed, August 2011 to January 2015), financed by the German Ministry for the Environment (BMU).

 

VERITAS:  Verifikation der Turbulenzparametrisierung und der Beschreibung der vertikalen Struktur der maritimen atmosphärischen Grenzschicht in numerischen Simulationsmodellen zur Windanalyse und -vorhersage (Verification of turbulence parameterization and description of the vertical structure of the marine atmospheric boundary layer in numerical simulation models for wind analysis and forecast, July 1, 2008 to November 30, 2011). This project has become working package 5 of OWEA. Search for "Förderkennzeichen 0325060" on http://www.forschungsjahrbuch.de/ for an extended project description in German. Financed by the German Ministry for the Environment (BMU).

 

TALL WIND: Large wind turbines - the wind profile up to 400 metres (funded by the Danish Council for Strategic Research (DSF)) (completed, 2008-2013) Project leader: Sven-Erk Gryning, Risoe DTU, description of wind profiles throughout the atmospheric boundary layer. Here, the focus will be on the influence of the mixing layer height on the shape of the vertical wind profile above the Prandtl (constant flux) layer.

 

OWID: (Offshore Wind Design Parameter): Analysis of wind and turbulence in the marine ABL from FINO1 data (research platform in the German Bight) (completed, April 1, 2005 to June 30, 2008). The complete PhD thesis of Matthias Türk may be found here or here as "Book on Demand"

 

ALPNAP: Surveillance and minimization of noise and air pollution due to transalpine traffic - INTERREG IIIB project (completed, final reports freely available).


Investigations of air quality and its impact on health by aerosol particles in Augsburg (west of Munich) in collaboration with the Centre for Environmental research of the University of Augsburg and Munich Helmholtz Centre (Institute of Epidemiology) in Neuherberg (ongoing).


 

Teaching:


Supernumerary Professor for Meteorology (apl Professur) at the University of Cologne.

 

Classes on energy meteorology


Classes on meteorological measurement techniques (for diploma students).


Classes on meteorological measurement techniques (for students heading for the International Master of Environmental Sciences (IMES)) (in English)


Supervision of bachelor, master, and PhD studies


 

Boards and committees:


Editor in Chief of Meteorologische Zeitschrift


Review Editor der of Climate Research


Chairman of the VDI working group „surface-based remote sensing of meteorological parameters“


President of the Energy Advisory Board of the county Weilheim-Schongau

 

Complete (clickable) list of publications