Explanation:

All three statements about the Arctic dipole are correct:

Correct: The positive phase of the Arctic dipole is characterized by high pressure over the Canadian Arctic and low pressure over the Siberian Arctic.

Correct: The Arctic dipole does indeed influence ocean currents and has significant impacts on air temperatures, heat exchanges, sea-ice drift, and ecological consequences throughout the year.

Correct: Recent studies have indeed found that the Arctic dipole has significant impacts on the Arctic Ocean climate, affecting various environmental and ecological aspects in the region.

Therefore, all the statements (1, 2, and 3) are correct.