| Abbreviation | Definition |
|---|---|
| ATS | Adaptive Threshold Sensing |
| ATS | Application Technology Satellite |
| ATSR | Along Track Scanning Radiometer |
| ATWC | Alaska Tsunami Warning Center |
| AUV | Autonomous Underwater Vehicle |
| AVHRR | Advanced Very High Resolution Radiometer |
| AVIRIS | Airborne Visible And Infrared Imaging Spectrometer |
| AVS | Application Visualization System |
| AWARDS | Automated Weather Acquisition and Retrieval Data System |
| AWARE | Aquatic World Awareness Responsibility Education |
| AWE | Advanced Wave Effects |
| AWIPS | Advanced Weather Interactive Processing System |
| AWIPS-90 | Advanced Weather Interactive Processing System for the 1990s |
| AXBT | Airborne Expendable Bathythermograph |
| AXCP | Airborne Expendable Current Profiler |
| BA | Blue Archipelago |
| BACA | Bridgeport Aquaculture College Allianca |
| BAHC | Biospheric Aspects of the Hydrological Cycle |
| BAO | Boulder Atmospheric Observatory |
| BAP | Benzo(a)pyrene |