# ``surface_par``
## Properties
:dimensions: N_PROF, N_LEVELS
:dtype: float64
## Default Attributes
| Attribute | Value |
|-----|-----|
|``whp_name`` | ``SPAR`` |
|``whp_unit`` | ``UMOL/M^2/SEC`` |
|``units`` | ``umol m-2 s-1`` |
|``C_format`` | ``%9.1f`` |
|``C_format_source`` | ``database`` |
## Description
Surfance reference for PAR, usually mounted on the top of the ship with a shield to block upwelling light. The downwelling photon flux of photons with a wavelength between 400nm and 700nm.