| Acronym | Meaning |
 | PD | Positive Definite |
| PRC | Inc. |
| ASTIA | Armed Services Technical Information Agency |
| UCAR | University Corporation For Atmospheric Research |
| PROBE | Portable Remote Observations Of The Environment |
| TSC | Technical Steering Committee |
| TGB | Trace Gas Biogeochemistry Section |
| NMC | National Meteorological Center |
| PCMDI | Program For Climate Model Diagnosis And Intercomparison |
| TCZ | Tropical Cloud Zone |
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