The two main processes that have been responsible for releasing O2 to the earth’s atmosphere are photosynthesis and photodissociation. Both involve the decomposition of water molecules and the removal of hydrogen from the atmosphere. The energy for photosynthesis in plants and bacteria is provided by visible light while UV photons of wavelength shorter than 240 nm are required for the direct, abiotic, photodissociation of atmospheric water vapour.
Weitere Kapitel dieses Buchs durch Wischen aufrufen
- Oxygen and Ozone Evolution in Palaeoatmospheres
J. H. Carver
- Springer Berlin Heidelberg