Objective
To investigate the self-cleansing ability of the troposphere through the determination of the concentration of free hydroxyl
A measurement campaign onboard the German research vessel POLARSTERN will be performed to measure
the latitudinal distribution of the OH radical concentration in the marine boundary layer (MBL) over the
Atlantic Ocean. The comparison of measured data with the predictions of a tropospheric OH photochemistry
model provides an ultimate test of this model. The measured OH data will be used for the assessment of the
oxidation of dimethyl sulphide (DMS) which is the dominant sulphur containing gas in surface marine waters.
The proposed project will investigate the OH induced formation of the DMS oxidation products SO2,
methanesulphonic acid (MSA), and non-sea-salt sulphate (nss-SO4) and the role they play in the formation of
submicrometer aerosol particles in the MBL. These aerosol particles strongly affect the global radiation budget;
the climate forcing due to sulphate aerosols is currently estimated to be comparable to that of greenhouse gases
but opposite in sign.
The project tasks are:
-Measurement of the concentration of OH radicals and their latitudinal distribution in the MBL over
the Atlantic Ocean during a ship cruise using laser long-path absorption spectroscopy.
-Simultaneous measurements of parameters important in controlling the OH concentration, including O3,
H2O, NO, NO2, NOy, CO, CH4, PAN, H2O2, HCHO, CH3CHO, NMHC,
photolysis rates, and
meteorological parameters.
-Test and improvement of a box model used for the description of the fast OH photochemistry. Model
studies of the sensitivity of the OH concentration to anthropogenic perturbations in the remote MBL.
-Determination of the oceanic source strength and the OH controlled lifetime of DMS in the MBL.
-Assessment of the role of DMS oxidation products in the formation of sub-micrometer aerosol particles
and cloud condensation nuclei.
-Evaluation of the impact of transport on the measured distribution of trace gases, nss-S04, and MSA
concentrations using a 3-D transport chemistry model.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- natural sciences chemical sciences electrochemistry electrolysis
- natural sciences chemical sciences physical chemistry photochemistry
- natural sciences physical sciences optics spectroscopy absorption spectroscopy
- natural sciences earth and related environmental sciences atmospheric sciences meteorology troposphere
- natural sciences physical sciences optics laser physics
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Programme(s)
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Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Topic(s)
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Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
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Funding Scheme
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Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Coordinator
52425 Jülich
Germany
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.