Question

Since the late 1970's what phase of the AO/NAO has become more dominate, especially in Winter?

Answer 1

The positive phase of the Arctic Oscillation (AO) and the North Atlantic Oscillation (NAO) has been more dominant since the late 1970s, bringing warmer winter climates to northern parts of the Atlantic.

Step-by-step explanation:

Arctic Oscillation and North Atlantic Oscillation

Since the late 1970s, the positive phase of the Arctic Oscillation (AO) and North Atlantic Oscillation (NAO) has become more dominant, especially in winter. The positive phase of AO/NAO is associated with warmer temperatures in the northern parts of the Atlantic, such as Europe and North America, and colder temperatures in the Arctic region. This phase results in a stronger westerly wind flow which brings mild ocean air into Eurasia and North America. In contrast, the negative phase would lead to more Arctic air flowing into these areas, causing colder and harsher winter conditions.

The impact of AO/NAO phases is evident in various aspects of life, including geographical variation in sports participation, climate changes over millennia due to Earth's axial tilt and orbital parameters, and historical periods like the Little Ice Age. These changes in climate patterns have significant effects on agriculture, resource availability, and population distribution.