The effect of packaging of chlorophyll within phytoplankton and light scattering in a coupled physical-biological ocean model

Baird, ME; Timko, PG; Wu, L

The effect of packaging of chlorophyll within phytoplankton and light scattering in a coupled physical-biological ocean model

Baird, ME

Timko, PG Wu, L

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Publication Type:: Journal Article
Citation:: Marine and Freshwater Research, 2007, 58 (10), pp. 966 - 981
Issue Date:: 2007-11-07

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Field	Value	Language
dc.contributor.author	Baird, ME https://orcid.org/0000-0003-4955-2298	en_US
dc.contributor.author	Timko, PG	en_US
dc.contributor.author	Wu, L	en_US
dc.date.issued	2007-11-07	en_US
dc.identifier.citation	Marine and Freshwater Research, 2007, 58 (10), pp. 966 - 981	en_US
dc.identifier.issn	1323-1650	en_US
dc.identifier.uri	http://hdl.handle.net/10453/13192
dc.description.abstract	A coupled physical-biological model forced with spectrally resolved solar radiation is used to investigate the effect of packaging of pigment and light scattering on physical and biological properties in the open ocean. Simulations are undertaken with three alternate formulations of vertical attenuation, which consider: (1) chlorophyll as dissolved in the water column; (2) chlorophyll packaged into phytoplankton cells with no scattering; and (3) packaged chlorophyll with scattering. In the coupled model, depth-resolved solar heating depends on the vertical profile of phytoplankton concentration, creating a feedback mechanism between the physical and biological states. The particular scenario investigated is a northerly wind off the coast of south-east Australia. The packaging of chlorophyll approximately halves the attenuation rate of 340-500 nm light and a phytoplankton maximum forms ∼10 m deeper than in the dissolved chlorophyll case, with a corresponding adjustment of the dissolved inorganic nitrogen and zooplankton fields. Scattering approximately doubles the vertical attenuation of 340-600 nm light, lifting the phytoplankton maximum by ∼10 m when compared with the packaged chlorophyll case. Additionally, strong horizontal gradients in chlorophyll distribution associated with filaments of upwelled water inshore of the East Australian Current, when modelled with alternate formulations of vertical light attenuation, result in circulation changes. The explicit representation of the packaging of pigment and light scattering is worth considering in coupled physical-biological modelling studies. © CSIRO 2007.	en_US
dc.relation.ispartof	Marine and Freshwater Research	en_US
dc.relation.isbasedon	10.1071/MF07055	en_US
dc.subject.classification	Marine Biology & Hydrobiology	en_US
dc.title	The effect of packaging of chlorophyll within phytoplankton and light scattering in a coupled physical-biological ocean model	en_US
dc.type	Journal Article
utslib.citation.volume	10	en_US
utslib.citation.volume	58	en_US
utslib.for	0602 Ecology	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
utslib.copyright.status	closed_access
pubs.issue	10	en_US
pubs.publication-status	Published	en_US
pubs.volume	58	en_US

Abstract:

A coupled physical-biological model forced with spectrally resolved solar radiation is used to investigate the effect of packaging of pigment and light scattering on physical and biological properties in the open ocean. Simulations are undertaken with three alternate formulations of vertical attenuation, which consider: (1) chlorophyll as dissolved in the water column; (2) chlorophyll packaged into phytoplankton cells with no scattering; and (3) packaged chlorophyll with scattering. In the coupled model, depth-resolved solar heating depends on the vertical profile of phytoplankton concentration, creating a feedback mechanism between the physical and biological states. The particular scenario investigated is a northerly wind off the coast of south-east Australia. The packaging of chlorophyll approximately halves the attenuation rate of 340-500 nm light and a phytoplankton maximum forms ∼10 m deeper than in the dissolved chlorophyll case, with a corresponding adjustment of the dissolved inorganic nitrogen and zooplankton fields. Scattering approximately doubles the vertical attenuation of 340-600 nm light, lifting the phytoplankton maximum by ∼10 m when compared with the packaged chlorophyll case. Additionally, strong horizontal gradients in chlorophyll distribution associated with filaments of upwelled water inshore of the East Australian Current, when modelled with alternate formulations of vertical light attenuation, result in circulation changes. The explicit representation of the packaging of pigment and light scattering is worth considering in coupled physical-biological modelling studies. © CSIRO 2007.

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http://hdl.handle.net/10453/13192