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{{Short description|Aspect of atmospheric sciences}}
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{{Atmospheric sciences}}
Over the last two centuries many environmental '''chemical observations''' have been made from a variety of ground-based, [[aircraft|airborne]], and [[Orbital spaceflight|orbital]] platforms and deposited in [[databases]]. Many of these [[databases]] are publicly available. All of the instruments mentioned in this article give online public access to their data. These observations are critical in developing our understanding of the [[Earth's atmosphere]] and issues such as [[climate change]], [[ozone depletion]] and [[air quality]]. Some of the external links provide repositories of many of these datasets in one place. For example, the Cambridge Atmospheric Chemical Database, is a large [[database]] in a uniform [[ASCII]] format. Each observation is augmented with the meteorological conditions such as the [[temperature]], [[potential temperature]], [[geopotential height]], and equivalent [[Potential vorticity|PV]] latitude.
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