The main goal of AAOE was to perform a complex study of polar stratospheric clouds and their relation to the late winter and spring ozone loss over the Antarctic (the ozone hole).

AASE's primary goal was to study the production and loss mechanism of ozone in the north polar stratospheric environment.

ABLE-2 quantified atmospheric trace gases’ sources, sinks, and distribution and characterized atmospheric chemical processes throughout the troposphere.

ABLE-3 was designed to survey two different high-latitude ecosystems over summer months, focusing on understanding the “early warning” response of a near-surface, organic active layer to climate variability.

NASA's Arctic-Boreal Vulnerability Experiment (ABoVE) field campaign linked field-based studies with geospatial data products derived from airborne and satellite sensors, helping researchers better understand climate change in the Arctic and boreal regions.

ACCP aimed to determine whether a sound theoretical and empirical basis existed for the estimation of nitrogen and lignin concentrations in ecosystem canopies from remote sensing data.

The ALTUS Cumulus Electrification Study (ACES) studied electrical activity within storms and validated satellite observations from the Lightning Imaging Sensor (LIS).

ACT-America was a multi-year NASA Earth Venture Suborbital-2 mission that focused on studying atmospheric carbon dioxide and methane transport across the Midwest, Mid-Atlantic, and southern United States.