analytical solution of the nitracline with the evolution of subsurface chlorophyll maximum in stratified water columns
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2017
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Abstract
In a stratified water column, the nitracline is a layer where the nitrate
concentration increases below the nutrient-depleted upper layer, exhibiting a
strong vertical gradient in the euphotic zone. The subsurface chlorophyll
maximum layer (SCML) forms near the bottom of the euphotic zone, acting as a
trap to diminish the upward nutrient supply. Depth and steepness of the
nitracline are important measurable parameters related to the vertical
transport of nitrate into the euphotic zone. The correlation between the SCML
and the nitracline has been widely reported in the literature, but the
analytic solution for the relationship between them is not well established.
By incorporating a piecewise function for the approximate Gaussian vertical
profile of chlorophyll, we derive analytical solutions of a specified
nutrient–phytoplankton model. The model is well suited to explain basic
dependencies between a nitracline and an SCML. The analytical solution shows
that the nitracline depth is deeper than the depth of the SCML, shoaling with
an increase in the light attenuation coefficient and with a decrease in
surface light intensity. The inverse proportional relationship between the
light level at the nitracline depth and the maximum rate of new primary
production is derived. Analytic solutions also show that a thinner SCML
corresponds to a steeper nitracline. The nitracline steepness is positively
related to the light attenuation coefficient but independent of surface light
intensity. The derived equations of the nitracline in relation to the SCML
provide further insight into the important role of the nitracline in marine
pelagic ecosystems.
| Reference Key |
gong2017biogeosciencesanalytical
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|---|---|
| Authors | ;X. Gong;W. Jiang;L. Wang;H. Gao;E. Boss;X. Yao;S.-J. Kao;J. Shi |
| Journal | tetrahedron letters |
| Year | 2017 |
| DOI |
10.5194/bg-14-2371-2017
|
| URL | |
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