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Dr.
University of Cologne Institute for Geophysics and Meteorology Pohligstr. 3 50969 Köln Germany
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+49 (0)221-470 6276
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Research Project
Synergy of raman lidar and microwave radiometry for high vertically resolved temperature and water vapor profilesHumidity and temperature are key meteorological variables and accurate, continuous and highly resolved measurements are required for a better understanding of many atmospheric phenomena. In particular their strong relation to land surface processes leads to high variability in the atmospheric boundary layer, which is difficult to capture from satellite measurements. Unfortunately, instruments available so far do not provide sufficient resolution to describe short time scale processes such as convection, cloud formation or boundary layer turbulence. In the last years, in order to overcome the specific limitation of a given instrument, scientific community started merging different data from several ground-based instruments. In this work, the synergy of a Microwave Radiometer (MWR) and a Raman Lidar (RL) system is presented. On the one hand, RL provides high vertically resolved measurements of temperature and humidity profiles, but it presents important weaknesses (i.e. “blindness” in and above clouds, noisy daytime operation) and therefore cannot be considered operational. On the other hand, MWR offers a much more limited vertical resolution on the retrieval of atmospheric profiles. But it is able to provide accurate integrated quantities such as Integrated Water Vapor (IWV) or Liquid Water Path (LWP). This instrument also allows continuous data acquisition in all weather conditions but rain. The retrieval method that brings together these two instruments is built up in an Optimal Estimation Scheme (OES) that allows a comprehensive uncertainty assessment. The method is applied to field campaigns in different climate regions where auxiliary measurements, e.g. radiosondes, allow evaluation of its performance. Up: Hamburg Raman Lidar (left) and MWR (right) at Barbados Clouds Observatory, in Barbados. Down: Examples of the kind of data the two instruments can provide. On the left hand side, Basil raman lidar and MWR operating at Juelich during the HOPE campaign, the 17th of April 2013. RL provides mixing ratio and MWR measures brightness temperatures.
Result of the joint retrieval between MWR and RL. Integrated water vapor comparison (up) and absolute humidity time series during the 17th of April 2013, a case study in the HOPE campaign (Juelich, Germany). |
Curr. Vitae
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Publications
Löhnert, U., J. H. Schween, C. Acquistapace, K. Ebell, M. Maahn, M. Barrera-Verdejo, A. Hirsikko, B. Bohn, A. Knaps, E. O'Connor, C. Simmer, A. Wahner, S. Crewell, 2015: JOYCE: Jülich Observatory for Cloud Evolution, Bulletin of the American Meteorological Society
Poster: Water Vapor and Temperature Measurements, Euclipse Summer School on Clouds and Climate, Les Houches, France, June24-July 5 2013
Poster: Water Vapor and Temperature Measurements, Summer School on Remote Sensing of Clouds and Precipitation, Hans Ertel Centre, Bonn, July 2013
Poster: Water Vapor and Temperature Measurements , First ITaRS Summer School on Aerosol Remote Sensing, Processes and Applications, Sept 23 - Oct 4, 2013, Bucharest, Romania.
Poster: Determination of atmospheric water vapor and termperature via inverse modeling using Raman lidar and microwave radiometry, Second ITaRS Summer School on Clouds and Precipitation: Observations and Processes, Sept 9-17, 2014, Juelich, Germany
Poster: Determination of atmospheric water vapor and termperature via inverse modeling using Raman lidar and microwave radiometry, Second GSGS conference, January 2015, Cologne
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Community Services
ITaRS Fellows representative, from February 2013 to nowadays Part of Young Earth System Scientist community (YESS) international council Marie Curie Alumni Association member (MCAA) Summer SchoolsEuclipse Summer School on Clouds and Climate, Les Houches, France, June24-July 5 2013 Summer School on Remote Sensing of Clouds and Precipitation, Hans Ertel Centre, Bonn, July 2013 First ITaRS Summer School on Aerosol Remote Sensing, Processes and Applications, Sept 23 - Oct 4, 2013, Bucharest, Romania. Second ITaRS Summer School on Clouds and Precipitation: Observations and Processes, Sept 9-17, 2014, Juelich, Germany Additional CoursesCourse on English presentations, University of Cologne Course on PhD coaching, University of Cologne Course on English writing skills, University of Cologne Course on Peer reviewed publications, University of Cologne ITaRS course on English scientific writing, Universidad Politécnica de Cataluña Computer skills and competencesProgramming languages: IDL, Matlab, Java, Mathematica, VHDL, LabView, web development based on HTML, Javascript, PHP and basic MySQL.
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