# ``d15n_pon``
## Properties
:dimensions: N_PROF, N_LEVELS
:dtype: float64
## Default Attributes
| Attribute | Value |
|-----|-----|
|``whp_name`` | ``D15N_PON`` |
|``whp_unit`` | ``/MILLE`` |
|``units`` | ``1e-3`` |
|``C_format`` | ``%9.1f`` |
|``C_format_source`` | ``database`` |
## Description
Enrichment of the 15N/14N isotopic ratio of particualte organic nitrogen