n the winter time, what is the typical climatic impact of a positive phase of the Southern Annular Mode? Points are awarded for each correct answer selected. Points are deducted for each incorrect answer selected. Question 4Answera.Drier conditions in eastern Australiab.Drier conditions in southern Australiac.Westerly wind belt migrates further south than normald.Increased rainfall in eastern Australia
Question
n the winter time, what is the typical climatic impact of a positive phase of the Southern Annular Mode? Points are awarded for each correct answer selected. Points are deducted for each incorrect answer selected. Question 4Answera.Drier conditions in eastern Australiab.Drier conditions in southern Australiac.Westerly wind belt migrates further south than normald.Increased rainfall in eastern Australia
Solution
The Southern Annular Mode (SAM), also known as the Antarctic Oscillation (AAO), refers to the north–south movement of the westerly wind belt that circles Antarctica. It dominates the mid to high latitude climate variability in the Southern Hemisphere.
In its positive phase, the following climatic impacts are typically observed:
a. Drier conditions in eastern Australia - This is incorrect. The positive phase of the SAM is associated with wetter conditions in eastern Australia, not drier.
b. Drier conditions in southern Australia - This is correct. The positive phase of the SAM is associated with drier conditions in southern Australia.
c. Westerly wind belt migrates further south than normal - This is correct. During the positive phase of the SAM, the belt of strong westerly winds contracts towards Antarctica.
d. Increased rainfall in eastern Australia - This is correct. The positive phase of the SAM is associated with increased rainfall in eastern Australia.
So, the correct answers are b, c, and d.
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