Marine
Nori and sea air — the aroma that accompanies umami in shaded Japanese green tea, and a different thing from the taste it travels with.
The seaweed note in gyokuro, tencha and high-grade matcha is the aroma most often confused with the savoury taste it arrives beside. They are not the same and they do not have the same cause. The savoury taste comes from free amino acids, theanine chief among them, and is a taste. The marine smell is usually attributed to dimethyl sulfide and related sulfur volatiles — a different compound class and a different route — and it is the reason the comparison to nori is so exact, since dried laver carries the same character. Both do track shading, which is why they appear together and why the confusion is easy to make. Keeping them apart is what lets a description say that a tea is savoury without being marine, or marine without much weight, which are both real and common. Note that the clean marine note here has nothing in common with the fishy fault in badly wet-piled shou, despite the overlapping words.
Which sense this is
Aroma. Volatile compounds, smelled through the nose or retronasally while drinking. Nearly all descriptive tea vocabulary is here, including words people say they can taste.
Aroma, and specifically not the umami taste it accompanies. The two travel together in shaded Japanese green tea because both track shading, and collapsing them is the commonest error in English-language description of gyokuro.
Compound descriptor. A familiar thing used as shorthand for a mixture of sensations. Nobody detects 'chestnut' — they recognise it.
Where it comes from
- Established chemistry
Dimethyl sulfide and related sulfur volatiles are the usual attribution for the nori-like character. This is a separate compound class from the amino acids behind the savoury taste, and the two should not be collapsed into one mechanism because both track shading.
The chemical route is identified in the literature. Often a family of related compounds rather than one named molecule.
Types: type-green-tea.
- Processing step
Shading before plucking is associated with both the marine aroma and the savoury taste, which is why they arrive together and are so often described as one thing.
A named production step reliably produces it. A statement about practice, not about chemistry.
Processing: process-shading, process-steaming. Types: type-green-tea.
Not to be confused with
- Umami (Taste) — The savoury taste that Japanese green tea is built around, and that Western flavour wheels leave out.
What gets said that is not right
That marine aroma and umami taste are one property with two names. They are a smell and a taste with different chemistry; they co-occur because both follow from shading.
The phrases this covers
Editors write tasting notes in their own words. These are the exact phrases in the catalogue that this descriptor accounts for — the mapping is authored phrase by phrase, so nothing is grouped by a rule that guessed.
light seaweed · salt · sea air · seaweed · sweet seaweed
Teas whose notes resolve to this
Derived from the tasting notes on each tea, not assigned by hand.
- Asamushi sencha
- Azores tea
- Chumushi sencha
- Enshi Yu Lu
- Gyokuro
- Kabusecha
- Karigane
- Konacha
- Laoshan green tea
- Matcha
- Matcha koicha grade
- Matcha usucha grade
- Mecha
- Miang
- Mizudashi sencha
- Sencha
- Tencha
- Uji sencha
- Yame gyokuro
- Yu Lu supreme grade
Nearby
A tasting note is a comparison, not a measurement. Where the route from leaf to sensation is established it is labelled as such above; where it is not, the page says so rather than supplying a mechanism the descriptor has not earned. See the rest of the vocabulary for how the axes divide up.