Incorrect variant of 味わい; this form is not standard and may appear as a mistake or in older texts. The correct word is 味わい.
See also: 味わい
The form 味あい is sometimes seen as an incorrect spelling of 味わい.
Rare and non-standard; the intended word is likely 味わい in its extended sense of 'meaning' or 'significance'. This form is not used in modern Japanese.
In this text, 味あい is used to mean 'meaning', but the correct form is probably 味わい.