Micrometeorological measurements during the total solar eclipse of August 11, 1999

Micrometeorological measurements of radiation, atmospheric and soil paramet ers, and turbulent energy and momentum fluxes, ozone and carbon dioxide flu xes have been conducted over a maize field at Freising-Weihenstephan in Sou thern Germany during the total solar eclipse on August 11, 1999. For the pe riod 30 minutes before and after the totality the weather conditions at the location where the micrometeorological measurements were made was satisfac tory. Several connections between the irradiation and other meteorological parameters over a maize field have been found. The time response between ir radiation and the long-wave upward radiation was only a few minutes, wherea s almost all parameters caused by the turbulent transport had a time shift of up to 30 minutes. A period of nearly 30 minutes with reduced turbulence regime after the totality was found. Using a wavelet transformation for the time series, a change of time scales from longer to shorter ones was obser ved before the totality, and after the turbulence increased in the short ti me scales. The investigation of the residuum of the closure of the energy b alance showed that with a time shift for the latent heat flux (unlike the n et radiation) after the totality, a better energy budget closure was obtain ed.