The High Resolution Doppler Imager

The distributions of most chemical species in the stratosphere are affected by both dynamical and chemical processes. Conversely, the distribution of certain photochemical species, such as ozone, can influence the radiative budget of the stratosphere, affecting temperatures and motions. Satellite remote observations of the stratosphere to date have provided only temperature and constituent measurements. The horizontal winds on a global basis have been deduced from temperature fields by using the thermal wind relationships, which relate the vertical shear of the geostrophic wind components to horizontal temperature gradients.

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