Heidelberg 2015 – scientific programme
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UP: Fachverband Umweltphysik
UP 16: Meßtechnik
UP 16.5: Talk
Friday, March 27, 2015, 12:30–12:45, G/gHS
Active Thermography as a Tool to Investigate Heat and Gas Transfer — •Jakob Kunz1 and Bernd Jähne1,2 — 1Institute of Environmental Physics, University of Heidelberg, INF 229, D-69120 Heidelberg, Germany — 2Heidelberg Collaboratory for Image Processing, University of Heidelberg, Speyerer Straße 6, D-69115 Heidelberg, Germany
Gas exchange between the ocean and the atmosphere plays a key role for climate modelling. While direct measurements of the gas exchange are mainly suitable for laboratory measurements with well-defined air and water volumes, local measurements of heat transfer are also possible in field experiments.
The active thermography measuring technique provides a tool to estimate heat transfer velocities both in lab and field experiments on spatial scales of less than a m2 and time scales in the order of minutes. It is based on heating a well-defined area of the water surface with a laser and measuring the temperature response of the water surface with an infrared camera in the 3-5 µ m range.
To compare gas and heat exchange under the most natural conditions possible in a laboratory, measurements with sea water from the north Atlantic have been performed in November 2014 in the annular Heidelberg wind-wave facility (Aeolotron) within the framework of the BMBF SOPRAN project.
The talk will explain the measuring technique and will present first results.