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0002
0003 .. _para_phys_pkg_darwin_dvm:
0004
0005 Diel Vertical Migration
0006 ^^^^^^^^^^^^^^^^^^^^^^^
0007
0008 (contributed by Darcy Taniguchi)
0009
0010 To enable diel vertical migration compile with :varlink:`DARWIN_ALLOW_DVM`
0011 defined in :filelink:`DARWIN_OPTIONS.h <pkg/darwin/DARWIN_OPTIONS.h>`.
0012 Runtime parameters are given at the bottom of this page.
0013
0014 During the day (when light is available), predators swim towards their
0015 preferred light level, :varlink:`PARpref`.
0016 At night they swim toward the level with maximum food availability (total prey
0017 for each predator type).
0018
0019 Higher trophic levels of predators beyond those in the model are represented
0020 by an additional mortality term:
0021
0022 .. math::
0023 M^{\text{DVM}}_j = m^{\text{DVM-max}}_j \frac{c_j}{k^{\text{DVM}}_j+c_j}
0024 \left( 1 - f^{\text{mort}}_{\text{PAR}\,j}
0025 + f^{\text{mort}}_{\text{PAR}\,j}
0026 \frac{I}
0027 {\frac{k^{\text{DVM}}_j}{k^{\text{DVM}}_j+c_j}
0028 k^{\text{PAR-DVM}}_j
0029 + I}
0030 \right) c_j
0031
0032 where :math:`I` is total PAR.
0033
0034 A fraction :varlink:`ExportFracDVM`\ (j) of :math:`M^{\text{DVM}}_j` goes to
0035 particulate organic matter, the rest to dissolved. Non-carbon elements are
0036 treated as for regular mortality.
0037
0038 Traits and parameters for diel vertical migration are shown in
0039 :numref:`tab_phys_pkg_darwin_dvm_traits`.
0040
0041 .. csv-table:: Traits for diel vertical migration
0042 :delim: &
0043 :widths: 20,22,14,15,28
0044 :header: trait,param,default,units,description
0045 :name: tab_phys_pkg_darwin_dvm_traits
0046
0047 :varlink:`bioswimDVM` & :varlink:`a_bioswimDVM` & 0.03 & m/s & swimming speed for diel vertically migrating plankton (pos. upwards) :cite:`bianchi:2013`
0048 & :varlink:`b_bioswimDVM` & 0 & &
** Warning **
Wide character in print at /usr/local/share/lxr/source line 1030, <$git> line 50.
0049 :varlink:`PARpref` & :varlink:`a_PARpref` & 0.0046 & μEin/m²/s & preferred PAR isolume for determining DVM; converted from W/m2 :cite:`bianchi:2013`
0050 & :varlink:`b_PARpref` & 0 & &
0051 :varlink:`mortmaxDVM` & :varlink:`a_mortmaxDVM` & 8.389E-5 & 1/s & maximum mortality rate related to PAR for DVM (ImaxHP :cite:`bianchi:2013` from :cite:`hansen:1997`)
0052 & :varlink:`b_mortmaxDVM` & --0.16 & &
0053 :varlink:`ksatDVM` & :varlink:`a_ksatDVM` & 1/:varlink:`a_R_NC` & mmol C/m³ & half saturation for DVM mortality (K_Z :cite:`bianchi:2013` from :cite:`stock:2010`)
0054 & :varlink:`b_ksatDVM` & 0 & &
** Warning **
Wide character in print at /usr/local/share/lxr/source line 1030, <$git> line 56.
0055 :varlink:`ksatPARDVM` & :varlink:`a_ksatPARDVM` & 0.46 & μEin/m²/s & half sat for light limitation for DVM (K_irr in :cite:`bianchi:2013`)
0056 & :varlink:`b_ksatPARDVM` & 0 & &
0057 :varlink:`fracPARmort` & :varlink:`a_fracPARmort` & 0.9 & & fraction of mortality from light-dependent mortality :cite:`bianchi:2013`
0058 & :varlink:`b_fracPARmort` & 0 & &
0059 :varlink:`ExportFracDVM` & :varlink:`a_ExportFracDVM` & 0.5 & & fraction of light-dependent mortality from DVM to POM
0060
