# ``d13c_poc``
## Properties
:dimensions: N_PROF, N_LEVELS
:dtype: float64
## Default Attributes
| Attribute | Value |
|-----|-----|
|``whp_name`` | ``D13C_POC`` |
|``whp_unit`` | ``/MILLE`` |
|``units`` | ``1e-3`` |
|``C_format`` | ``%9.2f`` |
|``C_format_source`` | ``database`` |
## Description
Enrichment of :sup:`13`\ C vs :sup:`12`\ C in particulate organic carbon (POC) compared to a reference standard usually VPDB. This is usually written as lower case delta δ\ :sup:`13`\ C.