Dr. rer. nat. Alexander Geiß

Internal Research Fellow

European Space Agency, European Space Research and Technology Centre, Noordwijk, The Netherlands

• Supporting the satellite mission Aeolus with respect to aerosol measurements by the atmospheric laser Doppler instrument (ALADIN)
• Developing an aerosol retrieval for the ALADIN airborne demonstrator A2D in order to optimize the satellite L2A data processor by using real atmospheric signals
• Assisting in the improvement of the L2A data processor by cooperation and exchange with developers

Research Assistant

Meteorological Institute of the Ludwig-Maximilians-Universität Munich, Germany

• Conducted and evaluated measurements with a research lidar of the European lidar network EARLINET in the project ACTRIS
• Investigated the potential of eye-safe simple one wavelength backscatter lidars (ceilometers) for aerosol monitoring

Student Research Assistant

Meteorological Institute of the Ludwig-Maximilians-Universität Munich, Germany

Conducted and evaluated lidar measurements for the European project ACTRIS

Working Student

Technische Universität Munich, Executive office of the University library, Germany

Duties of the treasurer of IATUL (International Association of University Libraries)

PhD in Meteorology

Meteorological Institute of the Ludwig-Maximilians-Universität Munich, Germany

Thesis title: Automated calibration of ceilometer data and its applicability for quantitative aerosol monitoring (Link)

• Developed a ceilometer calibration applicable to different types of ceilometers in order to harmonize networks of weather services
• Developed an algorithm for detecting atmospheric mixing layer heights with high temporal and spatial resolution by means of ceilometer measurements
• Applied the ceilometer calibration to long-term measurements from instruments of the German weather service
• Created statistics of the aerosol distribution and compared them with model data
• Investigated the influence of the mixing layer height on urban air quality

Diplom-Meteorologe (appproximately equivalent to a Master of Science in Meteorology)

Meteorological Institute of the Ludwig-Maximilians-Universität Munich, Germany

Thesis title: Calibration of the Jenoptik Ceilometer CHM15kx to retrieve aerosol-backscatter profiles

Military service

Mountain Infantry, Bischofswiesen - Strub, Germany

Abitur (equivalent to A-Levels)

Max-Planck-Gymnasium, Munich, Germany

Mixing layer height as an indicator for urban air quality?

A. Geiß, M. Wiegner, B. Bonn, K. Schäfer, R. Forkel, E. von Schneidemesser, C. Münkel, K. L. Chan and R. Nothard.
In Atmospheric Measurement Techniques, Volume 10, Number 8, 2969-2988.

doi: 10.5194/amt-10-2969-2017

What is the benefit of ceilometers for aerosol remote sensing? An answer from EARLINET.

M. Wiegner, F. Madonna, I. Binietoglou, R. Forkel, J. Gasteiger, A. Geiß, G. Pappalardo, K. Schäfer and W. Thomas.
In Atmospheric Measurement Techniques, Volume 7, Number 7, 1979-1997.

doi: 10.5194/amt-7-1979-2014

Aerosol profiling with the JenOptik ceilometer CHM15kx.

M. Wiegner, A. Geiß.
In Atmospheric Measurement Techniques, Volume 5, Number 8, 1953-1964.

doi: 10.5194/amt-5-1953-2012

Dual-wavelength linear depolarization ratio of volcanic aerosols: lidar measurements of the Eyjafjallajökull plume over Maisach, Germany.

S. Groß, V. Freudenthaler, M. Wiegner, J. Gasteiger, A. Geiß, and F. Schnell.
In Atmospheric Environment, Volume 48, 85-96.

doi: 10.1016/j.atmosenv.2011.06.017

Characterization of the planetary boundary layer during SAMUM-2 by means of lidar measurements.

S. Groß, J. Gasteiger, V. Freudenthaler, M. Wiegner, A. Geiß, A. Schladitz, C. Toledano, K. Kandler, M. Tesche, A. Ansmann, and A. Wiedensohler.
In Tellus, B, Volume 63, Issue 4, 695-705.

doi: 10.1111/j.1600-0889.2011.00557.x

A.Geiß, U. Marksteiner, O. Lux, C. Lemmerz, O. Reitebuch, T. Kanitz and A. G. Straume-Lindner. Retrieval of atmospheric backscatter end extinction profiles with the ALADIN airborne demonstrator. Poster at 28th ILRC, Bucharest.

A.Geiß and M. Wiegner. Aerosol profiling by calibrated ceilometer data. Talk at EGU 2015, Vienna.

A.Geiß and M. Wiegner. Absolute calibration of the Jenoptik CHM15k-x ceilometer and its applicability for quantitative aerosol monitoring. Poster at EGU 2015, Vienna.

A.Geiß and M. Wiegner. On the usefulness of ceilometers for aerosol monitoring. Poster at 4th ACTRIS meeting, Clermont-Ferrand.

A.Geiß and M. Wiegner. Absolute calibration of an Jenoptik ceilometer CHM15k-x and its applications. Talk at DACH Meteorologentagung, Innsbruck.

A.Geiß and M. Wiegner. On the benefit of ceilometers for aerosol remote sensing: absolute calibration of the Jenoptik CHM15kx. Talk at ACTRIS 2nd WP2-WP20 Workshop, Lecce.