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1d947889e4 Oliv*0001 .. include:: ../defs.hrst
0002
0003 .. _CDOM:
0004
0005 Dynamic CDOM
0006 ^^^^^^^^^^^^
0007
0008 To enable dynamic CDOM, define :varlink:`DARWIN_ALLOW_CDOM` in DARWIN_OPTIONS.h.
faa67d1773 Oliv*0009 Part of the dissolved organic matter produced by grazing and plankton mortality
0010 and part of remineralized particulate organic matter then goes into a
0011 fixed-stoichiometry CDOM pool. The CDOM tracer is in units of mmol C m\
0012 :sup:`-3` if :varlink:`DARWIN_CDOM_UNITS_CARBON` is defined and mmol P m\
0013 :sup:`-3` otherwise.
0014
0015 If :varlink:`DARWIN_CDOM_UNITS_CARBON` is defined:
1d947889e4 Oliv*0016
0017 .. math::
0018
faa67d1773 Oliv*0019 S_{\op{CDOM}} = f_{\op{CDOM}} \left(
0020 R_{\op{POC}} + g^{\op{DOC}} + \sum_j M^{\op{DOM}}_j
0021 \right) - D_{\op{CDOM}}
1d947889e4 Oliv*0022
faa67d1773 Oliv*0023 where :math:`R_{\op{POC}}` is remineralization of POC, :math:`g^{\op{DOC}}`
0024 grazing loss to DOC, :math:`M^{\op{DOM}}_j` mortality loss to DOC and
1d947889e4 Oliv*0025
faa67d1773 Oliv*0026 .. math::
1d947889e4 Oliv*0027
faa67d1773 Oliv*0028 D_{\op{CDOM}} = \left( r^{\op{degrad}}_{\op{CDOM}}
0029 + r^{\op{bleach}}_{\op{CDOM}} \min(1, I/I_{\op{CDOM}}) \right)
0030 f^{{{\text{remin}}}}(T) \cdot \op{CDOM}
1d947889e4 Oliv*0031
faa67d1773 Oliv*0032 CDOM degradation that goes into dissolved organic matter pools.
1d947889e4 Oliv*0033
faa67d1773 Oliv*0034 If :varlink:`DARWIN_CDOM_UNITS_CARBON` is undefined:
1d947889e4 Oliv*0035
0036 .. math::
0037
faa67d1773 Oliv*0038 S_{\op{CDOM}} = f_{\op{CDOM}} \left(
0039 R_{\op{POP}} + g^{\op{DOP}} + \sum_j M^{\op{DOM}}_j Q^{\mathrm{P}}_j
0040 \right) - D_{\op{CDOM}}
0041
0042 where :math:`R_{\op{POP}}` is remineralization of POP, :math:`g^{\op{DOP}}`
0043 grazing loss to DOP, :math:`M^{\op{DOM}}_j` mortality loss to DOC and
0044 :math:`D_{\op{CDOM}}` is defined as above.
0045
0046 Note that with :varlink:`DARWIN_ALLOW_DENIT` defined, CDOM degradation stops
0047 when :math:`{\mathrm{O}}_2<{\mathrm{O}}_2^{{\text{crit}}}` and
0048 :math:`\op{NO}_3<\op{NO}_3^{{\text{crit}}}` (but bleaching continues), see
0049 :numref:`Denitrification`.
0050
1d947889e4 Oliv*0051
faa67d1773 Oliv*0052 .. csv-table:: Parameters in namelist DARWIN_CDOM_PARAMS
0053 :delim: &
0054 :widths: 20,15,15,15,35
0055 :class: longtable
0056 :header: Param, Symbol, Default, Units, Description
1d947889e4 Oliv*0057
faa67d1773 Oliv*0058 :varlink:`fracCDOM` & :math:`f_{\op{CDOM}}` & 2/100 & & fraction of remineralized POP contributing to CDOM
0059 :varlink:`CDOMdegrd` & :math:`r^{\op{degrad}}_{\op{CDOM}}` & 1/200days & 1/s & CDOM degradation rate
0060 :varlink:`CDOMbleach` & :math:`r^{\op{bleach}}_{\op{CDOM}}` & 1/15days & 1/s & CDOM bleaching rate
** Warning **
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0061 :varlink:`PARCDOM` & :math:`I_{\op{CDOM}}` & 20 & μEin/m\ :sup:`2`/s & PAR where CDOM bleaching becomes maximal
0062 :varlink:`R_NP_CDOM` & :math:`R^{\mathrm{N}:\mathrm{P}}_{\op{CDOM}}` & 16 & mmol N / mmol P & CDOM N:P ratio (with #undef DARWIN_CDOM_UNITS_CARBON)
0063 :varlink:`R_FeP_CDOM` & :math:`R^{\mathrm{Fe}:\mathrm{P}}_{\op{CDOM}}` & 1D-3 & mmol Fe / mmol P & CDOM Fe:P ratio (with #undef DARWIN_CDOM_UNITS_CARBON)
0064 :varlink:`R_CP_CDOM` & :math:`R^{\mathrm{C}:\mathrm{P}}_{\op{CDOM}}` & 120 & mmol C / mmol P & CDOM C:P ratio (with #undef DARWIN_CDOM_UNITS_CARBON)
0065 :varlink:`R_NC_CDOM` & :math:`R^{\mathrm{N}:\mathrm{C}}_{\op{CDOM}}` & 16/120 & mmol N / mmol C & CDOM N:C ratio (with #define DARWIN_CDOM_UNITS_CARBON)
0066 :varlink:`R_PC_CDOM` & :math:`R^{\mathrm{P}:\mathrm{C}}_{\op{CDOM}}` & 1/120 & mmol P / mmol C & CDOM P:C ratio (with #define DARWIN_CDOM_UNITS_CARBON)
0067 :varlink:`R_FeC_CDOM` & :math:`R^{\mathrm{Fe}:\mathrm{C}}_{\op{CDOM}}` & 1D-3/120 & mmol Fe / mmol C & CDOM Fe:C ratio (with #define DARWIN_CDOM_UNITS_CARBON)
