National Technical Information Service, US Department of Commerce
In: Myrad 92 : Specialist Meeting on Microwave Radiometry and Remote Sensing Applications ; [held in Boulder, Colorado, January 14 - 16, 1992]. , ed. by Westwater, E. R. Proceedings of the Specialist Meeting on Microwave Radiometry and Remote Sensing Applications, 3 . National Technical Information Service, US Department of Commerce, Springfield, VA, USA, pp. 27-31.
The cloud liquid water path, LWP, over the North
Sea during the International Cirrus Experiment 1989 (ICE'89) is derived from measurements of the microwave radiometer SSM/I on board.of the polar orbiting satellite DMSP and from measurements of a ground-based 33-GHz-radiometer operating on board of the German research vessel 'Poseldon'. Comparisons of maps of LWP compiled from the SSM/I data with time series computed from the ground-based system show no significant bias and agree within the range of uncertainty caused by the different sampling characteristics of the observing systems. Using a combination of SSM/I data and almost simultaneously recorded METEOSAT-IR data offers the possibility to identify different cloud types, e.g. to seperate cirrus clouds and cirrus with underlying water clouds. Both types may have the same IR-brightness temperature but different microwave brightness temperature because ice clouds have a negligible influence on the microwave radiances.