superambient
/ˌsuːpərˈambɪənt/ /ˌsjuːpərˈambɪənt/adjective
1Of a fluid: that circulates or is situated above; overlying.
2Of a physical quantity: greater than in the immediate surroundings; greater than the general level in the environment.
Origin
Mid 17th century. From super- + ambient, perhaps after post-classical Latin superambient-, superambiens.