37th International Liège Colloquium on Ocean Dynamics, GAS TRANSFER AT WATER SURFACES, May 2- 6 2005 Fluxes of water vapour and CO2 using the dissipation technique

• Main Authors: Sørensen L. L, S. Larsen
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Greenland; Liège; Greenland Sea
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.525.3399; http://modb.oce.ulg.ac.be/backup/colloquium/sorensen.pdf

It is difficult to obtain good data sets of fluxes using the direct covariance technique and other conventional meteorological data in the marine atmosphere since these methods are sensitive to the motion on a ship and flow distortion caused by the large structure of a ship or a marine platform. The measurements are additionally challenging due to the very small fluxes occurring over the marine surface. The inertial-dissipation method is a good alternative to the covariance technique because it relies on measurements at high frequencies, which are not affected by platform motions. Furthermore the method is believed to be less sensitive to flow distortion caused by the ship. The method is best documented for momentum, but has also recently been tested for temperature, humidity and CO2 [Fairall, et al, 1990, Edson et al, 1991, Larsen et al, 2001]. Here we present fluxes of CO2 and water vapour estimated by the dissipation technique and other micro meteorological techniques. The measurements used are obtained from a forest site in Denmark, a coastal site in Sweden, a platform in the North Sea and a ship in the Greenland Sea. The fluxes were measured by three instruments: a Licor, an Ophir and an infrared sensor developed by KNMI (the IFM sensor), using the inertial dissipation method, the covariance and the relaxed eddy accumulation technique. The inertial dissipation method was carried out using the dissipation functions (eq.1 and eq.2).