a dynamic marine iron cycle module coupled to the university of victoria earth system model: the kiel marine biogeochemical model 2 for uvic 2.9
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2015
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Abstract
Marine biological production as well as the associated biotic uptake of
carbon in many ocean regions depends on the availability of nutrients
in the euphotic zone. While large areas are limited by nitrogen
and/or phosphorus, the micronutrient iron is considered the main
limiting nutrient in the North Pacific, equatorial Pacific and
Southern Ocean. Changes in iron availability via changes in
atmospheric dust input are discussed to play an important role in
glacial–interglacial cycles via climate feedbacks caused by changes
in biological ocean carbon sequestration. Although many aspects of
the iron cycle remain unknown, its incorporation into marine
biogeochemical models is needed to test our current understanding
and better constrain its role in the Earth system. In the University
of Victoria Earth System Climate Model (UVic) iron limitation in the
ocean was, until now, simulated pragmatically with an iron
concentration masking scheme that did not allow a consistent
interactive response to perturbations of ocean biogeochemistry or
iron cycling sensitivity studies. Here, we replace the iron masking
scheme with a dynamic iron cycle and compare the results to
available observations and the previous marine biogeochemical model.
Sensitivity studies are also conducted with the new model to test
the sensitivity of the model to parameterized iron ligand
concentrations, the importance of considering the variable
solubility of iron in dust deposition, the importance of considering
high-resolution bathymetry for the sediment release of iron, the
effect of scaling the sedimentary iron release with temperature and
the sensitivity of the iron cycle to a climate change scenario.
| Reference Key |
nickelsen2015geoscientifica
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|---|---|
| Authors | ;L. Nickelsen;D. P. Keller;A. Oschlies |
| Journal | international journal of quantum chemistry |
| Year | 2015 |
| DOI |
10.5194/gmd-8-1357-2015
|
| URL | |
| Keywords |
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