Atmospheric input of dissolved inorganic phosphorus and silicon to the coastal northwestern Mediterranean Sea: Fluxes,variability and possible impact on phytoplankton dynamics |
| |
| Institution: | 1. The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Study of the Earth''s Interior, Okayama University, Misasa, Tottori 682-0193, Japan;2. Department of Earth and Planetary Sciences, Tokyo Institute of Technology, Ookayama, Tokyo 152-8551, Japan;1. Department of Cardiology, University Heart Center, University Hospital Zurich, Zurich, Switzerland;2. Department of Biostatistics, Epidemiology, Biostatistics and Prevention Institute, University of Zurich, Zurich, Switzerland;3. Faculty Mechanical and Medical Engineering, Furtwangen University, Furtwangen, Germany;4. Department of Cardiology, University Hospital Basel, Basel, Switzerland;1. Cardiology Department and Acute Coronary Care Unit, Universidad Católica de Murcia-UCAM, Hospital Universitario Santa Lucía de Cartagena, Spain;2. Acute Coronary Care Unit, Hospital Universitario Virgen de la Arrixaca, Murcia, Spain;3. Cardiology Department, University Clinic Hospital, INCLIVA, Department of Medicine, University of Valencia, CIBER-CV, Valencia, Spain;1. Instituto Patagónico para el Estudio de los Ecosistemas Continentales, (IPEEC-CENPAT-CONICET), Bv. Almirante Brown 2915, 9120 Puerto Madryn, Chubut, Argentina;2. Centro de Investigaciones Geológicas (CIG-CONICET), Diagonal 113 Nro. 275, 1900 La Plata, Buenos Aires, Argentina |
| |
| Abstract: | One hundred twelve rainwater samples collected from 1986 to 2003 at the signal station of Cap Ferrat (France, NW Mediterranean coast) were analysed for phosphate and silicate contents. This sampling site is affected by a European urban-dominated background material, with episodic Saharan dust inputs. The input of dissolved inorganic phosphorus (DIP) and dissolved inorganic silicon (DISi) was calculated. The most significant loadings of DIP and DISi were selected in order to assess their potential impact on phytoplankton dynamics, particularly in oligotrophic conditions, when surface waters are nutrient-depleted. The theoretical new production triggered by DIP and DISi inputs (NPatmo) was estimated through Redfield calculations. The maximum theoretical DIP-triggered NPatmo was up to 670 mg C m?2 in October, at the end of the oligotrophic period (135 mg C m?3 in the 5 m-thick surface layer). During the same period, the daily integrated primary production measured at the DYFAMED site (NW Mediterranean Sea) was on average 219 mg C m?2 d?1 within the 0–100 m depth water column, while the mean daily primary production in the 5 m-thick surface layer was 1.6 mg C m?3 d?1. However, high NPatmo due to high DIP inputs might be episodically limited by lower DISi inputs, which may consequently lead to episodic preferential growth of non-siliceous phytoplanktonic species. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
