The Pacific Decadal Oscillation, or PDO, is a term used to describe fluctuations in the temperature of the Pacific Ocean. It is an important weather phenomenon that affects climate patterns all over the world. Other synonyms for PDO include Pacific North American Pattern, Pacific Interdecadal Oscillation, and Interdecadal Pacific Oscillation. These terms describe variations in ocean temperatures and atmospheric pressure over the Pacific Ocean that occur over a period of time. The PDO has a significant impact on fish populations, weather patterns, and global climate change. Scientists are continuously studying these oscillations to better understand their causes and effects, and to develop ways to predict their behavior in the future.