Heidelberg 2015 – scientific programme

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UP: Fachverband Umweltphysik

UP 4: Postersession Atmosphäre

UP 4.22: Poster

Wednesday, March 25, 2015, 10:45–19:45, G/Foyer

Preliminary results of the SOPRAN seawater gas exchange experiment in the Heidelberg Aeolotron — •Kerstin E. Krall¹, Jakob Kunz¹, Maximilian Bopp¹, Daniel Kiefhaber¹, Mariana Ribas Ribas², Janina Rahlff², Cuici Sun³, Martin Sperling³, Anke C. Nölscher⁴, Bettina Derstroff⁴, Christof Stönner⁴, Bernd Schneider⁵, Oliver Wurl², Anja Engel³, Jonathan Williams⁴, and Bernd Jähne^1,6 — ¹IUP, Universität Heidelberg — ²ICBM, Universität Oldenburg — ³GEOMAR, Kiel — ⁴MPIC, Mainz — ⁵IOW, Warnemünde — ⁶HCI am IWR, Universität Heidelberg

In November of 2014, air-sea gas exchange measurements using natural seawater were performed at the large annular wind-wave tank, the Aeolotron, within the BMBF SOPRAN project. Gas exchange velocities of a large number of trace gases (e.g. He, Xe, Kr, SF₆, CO₂, N₂O), volatile chemical species (e.g. DMS, acetone, acetonitrile, methanol) and heat, covering the whole range of solubility and diffusivity, were measured. Measuring techniques were LI-COR, FT-IR spectroscopy, MIMS, PTR-MS, and active thermography. Temperatures, water and wind velocities and wind waves were monitored as well. Eleven wind speeds ranging from 1.4 to over 10 m/s were used. An aerator was used to simulate strong breaking waves with bubble entrainment and spray formation. One goal of the experiment was to study the effects of natural surfactants present in the sea surface micro layer, which dampen waves and reduce gas transfer. This poster presents the setup of the experiment and discusses first preliminary results.