adjacent to shoreline pycnocline aquatic estuarine layer estuarine coastal upper water column estuarine coastal pycnocline https://cmecscatalog.org/cmecs/classification/unit/597.html This class aligns to the Coastal and Marine Ecological Classification Standard (CMECS). In ENVO, we may adapt the definition for consistency, but the semantics (meaning) of the term should be unaffected. Please consult the CMECS catalogue (https://cmecscatalog.org/) for authoritative and semantically unconstrained definitions. CMECS:597 A pycnocline which is part of an estuarine water body, spanning from the shore to a fiat boundary where the estuary bed below the water column reaches a depth of 4 meters. envoMarine envoCmecs estuarine coastal lower water column