variable reactivity of particulate organic matter in a global ocean biogeochemical model
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2017
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Abstract
The marine biological carbon pump is dominated by the vertical transfer of
particulate organic carbon (POC) from the surface ocean to its interior. The
efficiency of this transfer plays an important role in controlling the amount
of atmospheric carbon that is sequestered in the ocean. Furthermore, the
abundance and composition of POC is critical for the removal of numerous
trace elements by scavenging, a number of which, such as iron, are essential
for the growth of marine organisms, including phytoplankton. Observations and
laboratory experiments have shown that POC is composed of numerous organic
compounds that can have very different reactivities. However, this variable
reactivity of POC has never been extensively considered, especially in
modelling studies. Here, we introduced in the global ocean biogeochemical
model NEMO-PISCES a description of the variable composition of POC
based on the theoretical reactivity continuum model proposed by
Boudreau and Ruddick (1991). Our model experiments show that accounting for a
variable lability of POC increases POC concentrations in the ocean's interior
by 1 to 2 orders of magnitude. This increase is mainly the consequence of
a better preservation of small particles that sink slowly from the surface.
Comparison with observations is significantly improved both in abundance and
in size distribution. Furthermore, the amount of carbon that reaches the
sediments is increased by more than a factor of 2, which is in better
agreement with global estimates of the sediment oxygen demand. The impact on
the major macronutrients (nitrate and phosphate) remains modest. However,
iron (Fe) distribution is strongly altered, especially in the upper
mesopelagic zone as a result of more intense scavenging: vertical gradients
in Fe are milder in the upper ocean, which appears to be closer to
observations. Thus, our study shows that the variable lability of POC can
play a critical role in the marine biogeochemical cycles which advocates for
more dedicated in situ and laboratory experiments.
| Reference Key |
aumont2017biogeosciencesvariable
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|---|---|
| Authors | ;O. Aumont;M. van Hulten;M. Roy-Barman;J.-C. Dutay;C. Éthé;M. Gehlen |
| Journal | tetrahedron letters |
| Year | 2017 |
| DOI |
10.5194/bg-14-2321-2017
|
| URL | |
| Keywords |
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