Phytoplankton feedback on temperature and vertical processes in a thermal dome (guinea dome) (2006)
- Authors:
- Autor USP: WAINER, ILANA ELAZARI KLEIN COARACY - IO
- Unidade: IO
- Assunto: FITOPLÂNCTON MARINHO
- Language: Inglês
- Abstract: To survive, phytoplanktonic algaes use solar light to produce energy by photosynthesis. Their concentration depend directly on the light they receive. At the same time, phytoplankton, which can be estimated from chlorophyll concentration, has an impact on solar irradiance absorption, and thus on absorption of heat locally. Ocean temperature, mixed layer depth, advection, diffusion and turbulent processes may be influenced by chlorophyll concentration. To test this hypothesis, we have used a state-of-the-art optical model which incorporates this chlorophyll feedback on light absorption at 3 different wavelengths: red, green and blue. The model used is a 1D vertical model derived from the OPA ("Océan PArallélisé") French OGCM. This model has been forced by lateral conditions provided by climatologies of the OPA 3D version. It presents comparable results, including lateral processes, for a much lower computational cost. The region of interest in this model investigation is the Guinea Dome, around 20°W, 12°N. This zone, a thermal dome, has been chosen primary because its dynamics is mainly associated with vertical processes (vertical advection + vertical TKE diffusion). This justifies the choice of a 1D model. This region is also interesting because of the existence of a pronounced Deep Chlorophyll Maximum (DCM) which leads to a strong feedback on light absorption. Two experiments have been made; in the first one named "Constant Ocean" , the chlorophyll value has been set toa constant value of 0.06 mg m-3 in the euphotic zone, which is a typical value in open ocean, and in the second one, named"Interactive Ocean" (IO) the chlorophyll has realistic values given by the French PISCES biogeochemical model. A pronounced temperature difference can be seen between the 2 experiments, with a warming of the IO run during the whole year at sub-surface, and a cooling at depth below the DCM. Phytoplankton contributes to reinforce temperature difference can be explained by the "self shading" of the phytoplankton: at a given depth algaes absorbs light causing local heating and less available light for levels below. We have also shown that this "chlorophyll feedback" has an impact on the vertical advection, with a decrease at thermocline level of about 10%. Overall, it has been shown that the biological component can have an important role in ocean physics, especially in zones of strong chlorophyll concentration.
- Imprenta:
- Source:
- Título: resumos
- Conference titles: Simpósio Brasileiro de Oceanografia, 3
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ABNT
DUTEIL, Olaf et al. Phytoplankton feedback on temperature and vertical processes in a thermal dome (guinea dome). 2006, Anais.. São Paulo: Instituto Oceanográfico, Universidade de São Paulo, 2006. . Acesso em: 20 jan. 2026. -
APA
Duteil, O., Dandonneau, Y., Lazar, A., Menkes, C., & Wainer, I. E. K. C. (2006). Phytoplankton feedback on temperature and vertical processes in a thermal dome (guinea dome). In resumos. São Paulo: Instituto Oceanográfico, Universidade de São Paulo. -
NLM
Duteil O, Dandonneau Y, Lazar A, Menkes C, Wainer IEKC. Phytoplankton feedback on temperature and vertical processes in a thermal dome (guinea dome). resumos. 2006 ;[citado 2026 jan. 20 ] -
Vancouver
Duteil O, Dandonneau Y, Lazar A, Menkes C, Wainer IEKC. Phytoplankton feedback on temperature and vertical processes in a thermal dome (guinea dome). resumos. 2006 ;[citado 2026 jan. 20 ] - O Impacto do aumento dos gases estufa sobre o comportamento anual e sazonal do oceano Atlântico Sul
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