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Title

Nutrient deposition in coastal waters of the northwestern Mediterranean

AuthorsMarín, Isabel ; Peters, Francesc ; Gallisai, R. ; Aparicio, Francisco Luis ; Marrasé, Cèlia ; Leardi, Riccardo; Querol, Xavier
Issue Date5-Oct-2016
CitationXXXII Trobades Científiques de la Mediterrània : Planeta Oceà: 23 (2016)
AbstractThe Mediterranean Sea is a low‐nutrient, low‐chlorophyll region, characterized by a marine planktonic community limited predominantly by phosphorus (P), or P along with nitrogen (N) in the northwestern basin (NW). In this context, the deposition of nutrients from the atmosphere may play an important role, especially during the stratification period, when thermocline prevents mixing of nutrient‐rich deep waters into the photic zone. Two main sources of atmospheric particles have been identified in the NW Mediterranean: continuous antropogenically‐derived emissions from Europe and local sources, and episodic Saharan dust events. We provide data of atmospheric fluxes of inorganic nutrients and total organic carbon (TOC) in an urban coastal location of the NW Mediterranean. Bulk deposition of nitrate, nitrite, ammonium, phosphate, silicate, and TOC was measured from May, 2011 to January, 2016, using passive collectors. Nitrate and nitrite followed opposite seasonal patterns, nitrate deposition flux being higher during the spring‐summer period and nitrite during autumn. TOC deposition was also higher during spring, whereas the other nutrients did not follow any seasonal pattern but large peaks were associated to point events, as Saharan intrusions. Mean deposition fluxes were 127, 14, 175, 5, 7, and 521 µmol m-2 d-1, for nitrate, nitrite, ammonium, phosphate, silicate and TOC, respectively. Both N and P fluxes were much higher than values reported in more pristine areas of the Mediterranean (e.g., Markaki et al. 2010), but a similar N:P ratio was determined, whereas very low Si:N and Si:P ratios were determined. These results provide evidence of a higher anthropogenic footprint for N and P than for silicate. A principal component analysis revealed that silicate deposition was highly correlated with the presence of atmospheric particles from the Saharan desert and with wind speed, mainly associated to dryfall. On the other hand, nitrate, phosphate, TOC, and in a lesser extend, nitrate and ammonium, were more correlated with accumulated rainfall, suggesting that wet deposition is more common for these nutrients. Although ecological implications are difficult to estimate for larger spatial and temporal scales, these results suggest that an increasing trend in anthropogenic atmospheric inputs (rich in N, P and TOC) could drive the planktonic coastal system to an increase in primary production of non‐siliceous phytoplankton cells, concomitant with an increase in bacterial production, at certain times of the year, with the consequent risk of eutrophication
DescriptionXXXII Trobades Científiques de la Mediterrània, Planeta Oceà - Planet Ocean, celebradas del 5 al 7 de octubre de 2016 en Maó, Menorca.-- Homenatge als Drs. Marta Estrada, Jordi Font i Jordi Salat, pioners de l'oceanografia mediterrània moderna. A tribute to Drs. Marta Estrada, Jordi Font and Jordi Salat, pioneers of modern Mediterranean oceanography.-- 1 page
Publisher version (URL)http://planeta-ocea.icm.csic.es/?page_id=237&lang=es
URIhttp://hdl.handle.net/10261/170703
Appears in Collections:(ICM) Comunicaciones congresos
(IDAEA) Comunicaciones congresos
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