That means that over the first 3.5 km flow reach, the characteristics of the Danube water undergo a substantial thermal change. The regions with stagnant water exhibit much larger daily and annual water temperature curves than the flow reach. 48, Heft 4. 48, Heft 5. Dr. M. VEIT, Dipl.
Ozone is produced when solar radiation divides an oxygen molecule into two oxygen atoms.
Although ozone is only a small percentage of the gaseous constituents, it is the only component that absorbs appreciably radiation below 300 nm. Any change in UV-B radiation resulting from ozone depletion will only concern a few percent of the total solar spectrum. The impact of this change is likely to be significant as these wavelengths are particularly biologically active. Therefore it can influence the competitive ecology between plant species and other organisms. Furthermore UV-B radiation has effects on photosynthesis like inhibition of chloroplast functions associated with CO 2 fixation, electron transport, photophosphorylation, changes in carbohydrate metabolism.