Cold ocean currents returning to the  tropics, such as the Peru current result in cold air that can hold little moisture, and contribute to the driest desert on Earth.

返回热带地区的寒冷洋流，例如秘鲁洋流， 导致冷空气无法容纳太多水分，并导致地球上最干旱的沙漠的形成。