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faa67d1773 Oliv*0001 .. include:: ../defs.hrst
0002
0003 .. _para_phys_pkg_darwin_sink:
0004
0005 Sinking and Swimming
0006 ^^^^^^^^^^^^^^^^^^^^
0007
0008 Plankton and particulate organic matter sink with prescribed velocities. The
0009 downward flux from a grid cell to the cell below (in mmol m\ :sup:`--2` s\
0010 :sup:`--1`) is
0011
0012 .. math::
0013
0014 F_{k,k+1} = w_{\mathrm{sink}} p_k
0015
0016 where :math:`w_{\mathrm{sink}}` is one of the sinking velocities in
0017 :numref:`tab_phys_pkg_darwin_sink_param` and :math:`p_k` is the corresponding
0018 tracer concentration in the upper grid cell.
0019
0020 If :varlink:`DARWIN_BOTTOM_SINK` is defined, plankton and particulates can also
0021 sink into the bottom (where they are lost).
0022
0023 Plankton can also swim upwards with a fixed velocity,
0024
0025 .. math::
0026
0027 F_{k+1,k} = w_{\mathrm{swim}} p_{k+1}
0028
0029 .. csv-table:: Velocity parameters for particulate organic matter and plankton
0030 :delim: &
0031 :widths: auto
0032 :header: trait, parameter, tracer
0033 :name: tab_phys_pkg_darwin_sink_param
0034
0035 & :varlink:`wPIC_sink` & PIC
0036 & :varlink:`wC_sink` & POC
0037 & :varlink:`wN_sink` & PON
0038 & :varlink:`wP_sink` & POP
0039 & :varlink:`wSi_sink` & POSi
0040 & :varlink:`wFe_sink` & POFe
0041 :varlink:`biosink` & :varlink:`a <a_biosink>`,\ :varlink:`b_biosink` & plankon (c, n, p, fe, si and Chl quotas if present)
0042 :varlink:`bioswim` & :varlink:`a <a_bioswim>`,\ :varlink:`b_bioswim` & plankon (c, n, p, fe, si and Chl quotas if present)
0043
