Possible impacts of volcanic ash emissions of Mount Etna on the primary productivity in the oligotrophic Mediterranean Sea: Results from nutrient-release experiments in seawater

Nazli Olgun*, Svend Duggen, Daniele Andronico, Steffen Kutterolf, Peter Leslie Croot, Salvatore Giammanco, Paolo Censi, Loredana Randazzo

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78 Atıf (Scopus)

Özet

Atmospheric deposition of volcanic ash has recently been recognized as an important nutrient source into the surface ocean. Mount Etna (Italy), one of the world's most active volcanoes, is located in the oligotrophic Mediterranean Sea (MedSea). Despite the active volcanism on Mount Etna, the biogeochemical impacts of volcanic ash fallouts on the marine primary productivity (MPP) remain largely unknown. Here we present the results of seawater nutrient release experiments with volcanic ash samples from Mount Etna that have been collected during different eruptive episodes between 2001 and 2007. Our results show that volcanic ash from Mount Etna releases significant amounts of fixed-N (35-855nmol/g), P (7-970nmol/g), Si (3-2060nmol/g), Fe (10-130nmol/g) and Zn (<21nmol/g). We further estimated an example representative of ash-fall from Etna based on the case-study focusing on 4-5 November 2002 activity, by using the general relation between the thicknesses of the ash deposits and the ash depositional areas. Etna explosive eruptions can transport volcanic ash as far as 800km, with ash emissions exceeding the particle flux during dust storm events (of 10g/m2 input) as far as 400km downwind from the volcano. Our results emphasize that Etna ash can provide a significant supply of nutrients, which can favor the MPP in the central MedSea.

Orijinal dilİngilizce
Sayfa (başlangıç-bitiş)32-42
Sayfa sayısı11
DergiMarine Chemistry
Hacim152
DOI'lar
Yayın durumuYayınlandı - May 2013
Harici olarak yayınlandıEvet

Finansman

This study was supported by Helmholtz-Center for Ocean Research, GEOMAR through the multidisciplinary research group NOVUM “Nutrients originating volcanoes and their effects on the euphotic zone of the marine ecosystem” and contribution number 174 of the Sonderforschungsbereich (SFB) 574 “Volatiles and Hazards in Subduction Zones”. We are grateful to Antonio Cristaldi and Simona Scollo; INGV-Sezione di Catania for their help in the ash sample collection, and Deborah Lo Castro (INGV-Sezione di Catania) for assisting in the sample selection. We thank Frank Malien for helping during the photometric measurements and M. Thoener for technical assistance with the electron microprobe analyses.

FinansörlerFinansör numarası
GEOMAR
Helmholtz-Center for Ocean Research

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