As an expert sommelier and brewer, I can tell you that the act of aerating wine can have a significant impact on its flavor profile. However, it is important to note that not all wines benefit from aeration, and in some cases, it can even have a negative effect on the taste of the wine.
When a wine is aerated, it allows the wine to come into contact with the air, which can help to soften harsh tannins and release aromatic compounds. This is particularly true for younger red wines, which can often be quite tannic and closed off when first opened. By allowing these wines to breathe, the tannins can mellow out, and the aromas and flavors can become more pronounced.
On the other hand, certain wines, such as older red wines or delicate white wines, may not benefit from aeration. These wines have already had time to develop and mature, and exposing them to too much air can cause them to lose their delicate nuances and flavors. In fact, over-aerating these wines can result in a flat or oxidized taste, which is far from desirable.
In my experience, it is always best to assess each wine individually before deciding whether or not to aerate it. One way to do this is by simply giving the wine a swirl in the glass and taking note of its aromas and flavors. If the wine seems tight or closed off, it may benefit from aeration. However, if it already has a pleasant and expressive nose, it may be best to enjoy it as is.
Another factor to consider is the type of glassware being used. Certain wine glasses, such as those with a larger bowl, can naturally allow for some aeration as the wine is swirled around in the glass. This can be beneficial for wines that don't necessarily need a lot of aeration but could benefit from some gentle exposure to air.
The act of aerating wine can have a significant impact on its flavor profile. While some wines benefit from aeration, others either don't require it or can even be negatively affected by it. It is important to assess each wine individually and consider factors such as age, tannin levels, and delicacy before deciding whether or not to aerate. Ultimately, the goal is to enhance the wine's characteristics and create a more enjoyable drinking experience.