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Table 1
Overview of the different mean ⟨3D⟩ models and their reference depth scale for the horizontal or spatial averaging.
| Symbol | Spatial averages over layers of constant |
|
|
|
| ⟨3D⟩z | geometrical depth |
| ⟨3D⟩up | geometrical depth for the upflows |
| ⟨3D⟩dn | geometrical depth for the downflows |
| ⟨3D⟩L | (pseudo-Lagrangian) geometrical depth |
| ⟨3D⟩m | column mass density |
| ⟨3D⟩ptot | total pressure |
| ⟨3D⟩τ | acoustic depth |
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