New model for measurement of photon absorption in atmosphere

17 Jun 2002

A Johns Hopkins University scientist has created a new mathematical technique that will double the accuracy of computer models used for studying global changes of Earth's environment, such as ozone depletion and global warming caused by pollution.

Such models work by using equations to study and predict atmospheric dynamics and the transfer of energy in the atmosphere, explained Xun Zhu, a research scientist in the JHU Department of Earth and Planetary Sciences. Usually, the solar energy absorbed by the Earth's atmosphere is calculated by comparing the number of photons entering one section of atmosphere with the number of photons exiting a second section. The difference is the number of photons absorbed. Because the quantities of ozone and carbon dioxide are directly related to the amount of radiation energy-- or photons -- absorbed, such models can be used to indicate and predict ozone and carbon dioxide levels.