Final answer:
The Atlantic Oscillation (AO) is a climate pattern that affects weather patterns in Europe and the Eastern U.S. A positive phase of the AO is associated with mild conditions in these regions.
Step-by-step explanation:
The subject of this question is Geography and the grade level is High School.
In terms of the question itself, a "positive" phase of the Atlantic Oscillation (AO) is typically associated with mild conditions in Europe and the Eastern U.S. The AO is a climate pattern that affects weather patterns in these regions. During a positive phase, atmospheric pressure is lower over the polar regions, leading to a weaker jet stream and allowing warmer air to move towards Europe and the Eastern U.S.
For example, during a positive AO phase, temperatures may be milder in regions like England, France, Germany, and the Eastern U.S. compared to a negative AO phase.