Cluster A - Projects

A01

Structural controls of soil hydraulic properties


Dr. Sara Bauke
University of Bonn  |  +49-228-73 2965  |  [Email protection active, please enable JavaScript.]

Prof. Dr. Wulf Amelung
University of Bonn  |   +49-228-73 2780  |  [Email protection active, please enable JavaScript.]


Summary

The hydraulic conductivity function of soils is a key property, controlling the partitioning of water into soil infiltration and surface runoff as well as the flow of water within the soil profile. Structure is an important factor for hydraulic conductivity in the wet range of soil moisture. However, this is currently not well implemented into land surface models, which typically produces incorrect representations of hydraulic conductivity at and near saturation, erroneous estimates of water partitioning at the soil surface especially in extreme events and thereby a misrepresentation of soil and surface water fluxes in the global water cycle. In this project we will therefore assess the effect of soil structure on soil hydraulic conductivity for different climatic, soil and land use setting across Europe. The results will then be incorporated into continental-scale modelling of water and energy cycles.

 

A02

Estimation of root zone soil moisture from gamma radiation measurements


Prof. Dr. J.A. (Sander) Huisman
Forschungszentrum Jülich  |  +49-2461-618607  |  [Email protection active, please enable JavaScript.]


Summary

Root zone soil moisture is an essential variable in land surface models, but there is still a lack of sensing information that adequately represents this zone. In this project, we want to explore whether a root zone soil moisture product for Europe can be derived from existing gamma radiation data available from the European radiological data exchange platform (EURDEP). For this, it is important to understand how infiltration, evaporation, transpiration, and secondary cosmic radiation affect measured gamma radiation.

 

02 | PhD student
in the field of physical geography, soil science or environmental engineering

75% (E13 TV-L) | All positions are fixed-term, initially for a period of either 3 or 4 years, with the possibility of an extension

Will be published soon on the website of the university

In project A02, we are looking for a PhD student in the field of physical geography, soil science or environmental engineering with a focus on soil physics or subsurface hydrology. Skills in quantitative data analysis and experience with laboratory soil analysis as well as field work are desirable.

A03

Parameterization of evapotranspiration partitioning function in land-surface models using water stable isotopes


Prof. Dr. Youri Rothfuss
Forschungszentrum Jülich  |  +49-2461-96925  |  [Email protection active, please enable JavaScript.]

Prof. Dr. Nicolas Brüggemann
Forschungszentrum Jülich  |  +49-2461-8643  |  [Email protection active, please enable JavaScript.]


Summary

In this sub-project, we would like to answer the question whether CLM5.0 simulations for specific ecosystems (or for major ecosystem/climate combinations) can be improved by a better representation of the ration of transpiration to evapotranspiration (T/ET). We aim to combine high frequency and non-destructive measurements of the stable isotopic compositions of soil and plant water as well as of ambient air humidity exemplary at selected experimental sites, i.e., one arable land, one grassland, and one coniferous forest in the temperate climate zone (part of the TERENO Rur catchment observatory, Germany), and one Mediterranean tree-grass system (MANIP experiment, Majadas del Tietar, Spain). These sites were chosen to cover the major plant functional types (PFT) represented in CLM5.0. The isotopic data will be used to parameterize the isotope-enabled soil-vegetation-atmosphere transfer model SiSPAT-Isotope for field-scale simulations of T/ET for different PFT and climatic conditions. The project will contribute to the CRC’s key objectives in that it will provide essential information for improving the PFT-specific parametrization of T/ET ratios implemented in CLM5.0.

 

03 | PhD student
in the field of micro-meteorology and water stable isotope ecohydrology

75% (E13 TV-L) | All positions are fixed-term, initially for a period of either 3 or 4 years, with the possibility of an extension

Will be published soon on the website of the university

In project A03, we are looking for a PhD student in the field of micro-meteorology and water stable isotope ecohydrology, with a background in soil-plant-atmosphere interactions and process-based modeling. He/She will be responsible for the deployment of the mobile field laboratory to the different test sites and collect the isotope data needed for simulation.

A04

Precipitation processes


PD. Dr. Silke Trömel
University of Bonn  |  +49-228-73779  |  [Email protection active, please enable JavaScript.]


Summary

Atmospheric models still do not adequately represent precipitation generating processes, which is partly responsible for their deficiency in reproducing observed regional trends in total water storage (TWS). We will quantify these deficiencies in the Integrated Monitoring System (IMS) by exploiting especially polarimetric radar observations with inherent information on precipitation generating processes aloft. The use of polarimetric microphysical retrievals and the evaluation of climate model runs in radar observation space enable us to compare the observed and simulated impact of greenhouse gas forcing and regional anthropogenic interventions on precipitation generation.

 

04 | Postdoc researcher
in the field of radar polarimetry

100% (E13 TV-L) | All positions are fixed-term, initially for a period of either 3 or 4 years, with the possibility of an extension

Will be published soon on the website of the university

In project A04, we are looking for a Postdoc researcher in the field of radar polarimetry, with a background in processing of radar data, their microphysical information content, and optimally experience in their application for model evaluation using forward operators and/or retrievals.

A05

Representation of adaptation: the on-farm perspective


Prof. Dr. Silke Hüttel
University of Bonn  |  +49-228 73-2891  |  [Email protection active, please enable JavaScript.]

Prof. Dr. Michael Leyer
University of Rostock  |  +49-381 498-4100  |  [Email protection active, please enable JavaScript.]

Dr. Stefan Seifert
University of Bonn  |  +49-228 73-2894  |  [Email protection active, please enable JavaScript.]


Summary

In A05, we aim at an improved representation of how farmers adapt to climate change, altering weather (extremes), production risk and efficiency, and ultimately expectations on farming returns. Yet to date, farms seem reluctant to adapt their farming structure. Based on the real options approach, we hypothesize that this reluctance can be explained by farms’ investment behaviour under risk and various sources of inefficiency. We test this hypothesis using observational data. To understand underlying cognitive decision processes under extreme hydrometeorological events, we test the impact of such perceived instances on farm adaptation decisions using an experimental approach.

 

05 | PhD student
in the field of agricultural economics or related fields

75% (E13 TV-L) | All positions are fixed-term, initially for a period of either 3 or 4 years, with the possibility of an extension

Will be published soon on the website of the university

In project A05, we are looking for a PhD student with a background in agricultural economics or related fields. Our research plan requires interest and expertise in production economics and behavioral experiments as well as methodological skills in econometrics and efficiency analysis.

A06

Processes and determinants of climate-relevant landscape configurations


Prof. Dr. Jan Börner
University of Bonn  |  +49-228-733548  |  [Email protection active, please enable JavaScript.]

Prof. Dr. Thomas Heckelei
University of Bonn  |  +49-228-732331  |  [Email protection active, please enable JavaScript.]

Prof. Dr. Silke Hüttel
University of Bonn  |  +49-228-732891  |  [Email protection active, please enable JavaScript.]


Summary

This project seeks to advance the understanding of the determinants of spatiotemporal dynamics in landscape configuration and composition, including crops, forests, and grasslands. Considering the broad range of theories of land system change, we explore relevance of and interaction between economic trends, agricultural market dynamics, infrastructure investments, and related risks and policies at various administrative scales. In close collaboration with natural sciences, we generate metrics of landscape dynamics and analyze related drivers and their interaction/interrelation using multivariate econometric methods combined with machine learning techniques.

 

06 | PhD student
in the field of applied or agricultural economics and related fields

75% (E13 TV-L) | All positions are fixed-term, initially for a period of either 3 or 4 years, with the possibility of an extension

Will be published soon on the website of the university

In project A06, we are looking for a PhD student with a background in applied or agricultural economics and related fields. Our research plan requires interest and expertise in theories of land system change as well as methodological skills in econometric and spatial analysis.

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