SOES: INTERANNUAL VARIABILITY

1. During the negative phase of the NAO, pressure difference is ................. . (8)
3. The polar vortex is enhanced when the quasibiennial oscillation is in its ............. phase. (8)
4. During the warm phase of the PDO, which country's fisheries benefit from upwelling? (6)
8. During the cold phase of the PDO, what occurs along the California coast? (9)
9. The name of the weather feature created by the difference in pressure across stratospheric layers, which keeps cold Arctic air in the Arctic. (5, 6)

2. When winds are stronger during the NAO, Northern Europe is ............ . (6)
3. Weak westerly winds can be as a result of a ........... PV. (4)
6. The name of the wave type which transfers weather systems across the globe. (6)
7. The strength and direction of Westerlies are controlled by .............. differences. (8)
10. The cold phase of the PDO causes cold water to build up along the US coast. This is because of weaker ........ ............ . (5, 5)

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