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Stephan Mertes Leibniz-Institute for Tropospheric Research, Leipzig, Germany

Sampling of cloud drops and measurement of physico-chemical properties of their residues and of interstitial particles at East Peak A possible contribution to PRADACS. Stephan Mertes Leibniz-Institute for Tropospheric Research, Leipzig, Germany. Experimental setup during RICO-PRACS in Dec 2004.

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Stephan Mertes Leibniz-Institute for Tropospheric Research, Leipzig, Germany

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  1. Sampling of cloud drops and measurement of physico-chemical properties of their residues and of interstitial particles at East Peak A possible contribution to PRADACS Stephan Mertes Leibniz-Institute for Tropospheric Research, Leipzig, Germany

  2. Experimental setup during RICO-PRACS in Dec 2004 CVI INT PVM

  3. Measurement devices downstream the CVI

  4. Measurement devices downstream an interstitial inlet

  5. Additional information • The CVI provides a total sample flow of about 10 L/min, which is enriched of drop residues by a factor 6 to 8. Thus, eventually not all sensors can be operated at the same time. • Beside the CVI a PVM will be operated, which optically measures LWC and effective drop radius. • Persons on-site: • Stephan Mertes: setup and measurement period • electronic technician: setup phase • Close instrumental collaboration with MPI Mainz. Thus, only a participation in the fall experiment seems meaningful at the moment. • Beside myself, our chemistry department (ToF-AMS, aerosol and cloud water chemistry), and our cloud and aerosol group (CCN-counter, SMPS, MAAP) has interest to take part, but they are already involved in other projects. Their participation is still uncertain and depends on the exact determination of the measurement periods.

  6. Scientific objectives • Comprehensive physico-chemical characterization of drop residues (attributed to the original CCN) and interstitial particles in trade wind cumuli. • Better understanding of the role of different aerosol types (sea salt, nss- sulfate, organics, dust) for cloud formation in the tropics, especially with regard to drop concentration and drop effective diameter. • Differentiation of drop forming particles that have oceanic sources to those nucleated in the tropical rain forest, by means of the CSJ aerosol measurements at connected flow conditions. • Measurement of the amount of charges on cloud drops of trade wind cumuli, which might have implications on drop coalescence and aerosol scavenging.

  7. Questions, remarks, needs • A first inquiry yielded total costs of 12 k€ and 19 k€ for the participation in one or two campaigns (30 days each), when the equipment stays in PR in between. Funding to take part in two campaigns is not yet confirmed. • Location of inlet installation and measurement racks at EP ? • Power availability and power transformation possibilities at EP ? • Exact dates of setup and measurement phase of both IOPs ? • Does an interstitial or total inlet exists at EP to connect part of my sensors? • Is there an Aerosol Mass Spectrometer in CSJ for comparison with the AMS measurements of drop residues and interstitial particles?

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