Final answer:
The dewpoint off the coast of Nassau suggests that the air over the ocean has a lower water vapor concentration compared to the air on the landward side of the stationary front.
Step-by-step explanation:
The dewpoint at Nassau indicated air with relatively lower concentrations of water vapor was offshore along the stationary front as compared to the location on the landward side of the stationary front. Knowing that an increase of 18 F° in dewpoint represents about a doubling of water vapor concentration, we can deduce that a lower dewpoint corresponds to a lower concentration of water vapor present.
Dewpoint is a crucial conceptual measure in meteorology. It represents the temperature to which air must be cooled for water vapor to condense into liquid water. The process of condensation releases heat, which impedes further temperature reduction. This is why dewpoint is a critical indicator not only for predicting weather patterns, such as the likelihood of rain or frost, but also for agriculture, where it helps to assess the probability of freezing temperatures that can impact crops. Lower dewpoints also mean that humidity is lower, which explains why deserts can experience significant temperature swings.