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April 2019
Message 95

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[Met-jobs] PhD position on airborne in-situ measurements (SOUTHTRAC) at IPA, JGU Mainz, Germany

From Daniel Kunkel <dkunkel@uni-mainz.de>
To <met-jobs@lists.reading.ac.uk>
Date Wed, 24 Apr 2019 11:34:32 +0200

The atmospheric circulation differs substantially in the troposphere and stratosphere between the  northern and the southern hemisphere. The age structure and the stratospheric downwelling are different in the corresponding seasons in each hemisphere. Further, in the northern hemisphere the Asian summer monsoon anticyclone affects the circulation and composition particularly of the lowermost stratosphere during summer and autumn. The southern hemispheric lower stratosphere during this time is influenced by the Antarctic polar vortex. In addition jet location, tropopause structure and cyclone tracks are different in both hemispheres, mostly due to differences in the land sea distribution and orography. In total these factors lead to hemispherical differences of transport and mixing processes leading to differences in the lowermost stratospheric composition.

Airborne measurements in the southern hemisphere lowermost stratosphere are relatively sparse compared to the northern hemisphere. Within the SOUTHTRAC project, in which the German research aircraft HALO will be used, comprehensive measurements in the southern lowermost stratosphere will be performed. We will perform in-situ measurements of tracers (CO, CO2, CH4, N2O) using quantum cascade laser infrared absorption spectroscopy to study mixing and transport processes particular at the tropopause and in the lowermost stratosphere.

The successful applicant will

  1. be responsible for the instrument and will perform the measurements in South America
  2. identify interhemispheric differences of the lower stratospheric composition including previous HALO or other campaigns to quantify composition differences
  3. identify potential signatures of interhemispheric exchange
  4. identify hemispheric differences of transport mechanisms and age structure on the basis of the measurements in combination with Lagrangian tools and ECMWF reanalysis data (ERA-Interim, ERA-5). This will include case studies as well as a climatological analysis. The final goal is the quantification of transport time scales and air mass budgets for the lower stratosphere of both hemispheres.

The applicant should have a MSc/Diploma in Meteorology or related disciplines (physics, environmental sciences, atmospheric science, etc.). The applicant should have strong technical or laboratory skills and experience in spectroscopic techniques, preferably in laser spectrometers for atmospheric gases. She or he should ideally have programming skills using Python, IGOR or IDL. The willingness to participate in the campaign and to stay abroad for several weeks is a must as well as the willingness to work in a larger international team.

The PhD position will be funded for three years and can be started immediately. Applications with the usual documents, including CV, diplomas, should be sent to Prof. Peter Hoor (hoor@uni-mainz.de) via email in one pdf-file. Review of applications will begin on May 01, 2019 and will continue until the position is filled. For further questions about the position, please contact Prof. Peter Hoor.

-- 
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Dr. Daniel Kunkel                                   
                                                    
Airborne measurements and UTLS transport processes  
Institute for Atmospheric Physics                   
Johannes Gutenberg-University Mainz                 
Johann-Joachim-Becherweg 21                         
55128 Mainz, Germany                                
                                                    
phone: +49 (0)6131 39 22283                         
web: www.staff.uni-mainz.de/dkunkel/welcome.html      
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