The atmosphere and ocean involve many scales — from a dust mote that acts as a condensation nucleus for a raindrop, to a global phenomena like El Niño. A variety of properties are within the atmosphere, including heat, moisture, and various chemical species. Analyzing and predicting the composition and interaction of these properties is essential to understanding atmospheric effects on our lives. Different models are used for different purposes. Some simulate the effects of weather and solar events on sophisticated sensors, while others look at the effect of chemicals in the atmosphere. AER's capabilities cover the atmosphere from surface to space, and our expertise is well honed within the following areas: