Study of the significant release of inorganic nutrients during eruptive and degasification stages by the submarine volcano Tagoro, El Hierro island S IGNIF ICANT RELEASE OF NUTR IENTS BY THE SUBMARINE VOLCANO TAGORO

_______________________________________________________________________ 4 MOTIVATION _____________________________________________________________________ 4 BACKGROUND ____________________________________________________________________ 5 INTRODUCTION ___________________________________________________________________ 7 METHODOLOGY __________________________________________________________________ 9 1. Oceanographic cruises ____________________________________________________________ 9 2. Hydrography __________________________________________________________________ 10 3. Nutrient analysis ________________________________________________________________ 11 4. Fluorescence data ______________________________________________________________ 12 5. Bathymetry ____________________________________________________________________ 12 6. Graphics and data analysis ________________________________________________________ 12 RESULTS _________________________________________________________________________ 13 1. Quantification of nutrient emissions _________________________________________________ 13 2. Spatial distribution of nutrient anomalies during eruptive stage ____________________________ 16 3. Spatial distribution of nutrient anomalies during degasification stage ________________________ 18 4. Nutrient ratios _________________________________________________________________ 20 5. Chlorophyll anomalies surrounding the main craters ____________________________________ 21 DISCUSSION _____________________________________________________________________ 23 CONCLUSIONS ___________________________________________________________________ 26 FUTURE WORKS __________________________________________________________________ 27 ACKNOWLEDGEMENTS ____________________________________________________________ 28 LIST OF FIGURES __________________________________________________________________ 29 LIST OF TABLES ___________________________________________________________________ 30 BIBLIOGRAPHY ___________________________________________________________________ 31 VALORACIÓN PERSONAL __________________________________________________________ 33 S IGNIF ICANT RELEASE OF NUTR IENTS BY THE SUBMARINE VOLCANO TAGORO