Total vs. Alveolar Ventilation and the Anatomic Dead Space

Practice: You and your significant-other go on a romantic snorkeling trip while on a vacation in Miami, FL. While snorkeling, you notice that you have to breathe more rapidly than you normally would while swimming. Which of the following variables in the alveolar ventilation equation (AV=[VT-Dead Space]×RR) has been changed by using a snorkel, and what is the effect on that change on alveolar ventilation (AV)?