The natural ocean acidification and fertilization event caused by the submarine eruption of El Hierro

The shallow submarine eruption which took place in October 10th 2011, 1.8 km south of the island of El Hierro (Canary Islands) allowed the study of the abrupt changes in the physical-chemical properties of seawater caused by volcanic discharges. In order to monitor the evolution of these changes, seven oceanographic surveys were carried out over six months (November 2011-April 2012) from the beginning of the eruptive stage to the post-eruptive phase. Here, we present dramatic changes in the water column chemistry including large decreases in pH, striking effects on the carbonate system, decreases in the oxygen concentrations and enrichment of Fe(II) and nutrients. Our findings highlight that the same volcano which was responsible for the creation of a highly corrosive environment, affecting marine biota, has also provided the nutrients required for the rapid recuperation of the marine ecosystem.

[1]  H. Sigurdsson,et al.  Exploring Submarine Arc Volcanoes , 2007 .

[2]  E. Baker,et al.  Venting of Acid-Sulfate Fluids in a High-Sulfidation Setting at NW Rota-1 Submarine Volcano on the Mariana Arc , 2007 .

[3]  Corinne Le Quéré,et al.  Rapid growth in CO2 emissions after the 2008-2009 global financial crisis , 2011 .

[4]  J. M. Rhodes,et al.  Researchers Rapidly Respond to Submarine Activity at Loihi Volcano, Hawaii , 1997 .

[5]  Pablo Sangrà,et al.  Coupling between the open ocean and the coastal upwelling region off northwest Africa: water recirculation and offshore pumping of organic matter , 2005 .

[6]  E. Baker,et al.  Submarine hydrothermal activity along the mid-Kermadec arc, New Zealand: Large-scale effects on venting (abstract of paper presented at: 16th Annual V.M. Goldschmidt Conference 2006, Melbourne, Australia, 27 Aug-1 Sept 2006) , 2006 .

[7]  F. Millero,et al.  The solubility of iron in seawater , 2002 .

[8]  Kentaro Nakamura,et al.  Explorations of Mariana Arc volcanoes reveal new hydrothermal systems , 2004 .

[9]  Robert H. Byrne,et al.  Spectrophotometric seawater pH measurements: total hydrogen ion concentration scale calibration of m-cresol purple and at-sea results , 1993 .

[10]  P Mendes,et al.  Biochemistry by numbers: simulation of biochemical pathways with Gepasi 3. , 1997, Trends in biochemical sciences.

[11]  A. F. Hofmann,et al.  The effect of biogeochemical processes on pH , 2007 .

[12]  D. Wallace,et al.  Program developed for CO{sub 2} system calculations , 1998 .

[13]  F. Morel,et al.  A general kinetic model for iron acquisition by eukaryotic phytoplankton , 2005 .

[14]  M. Veldhuis,et al.  Co-variance of dissolved Fe-binding ligands with phytoplankton characteristics in the Canary Basin , 2006 .

[15]  J. Hunter,et al.  Rapid rates of growth and collapse of Monowai submarine volcano in the Kermadec Arc , 2012 .

[16]  M. González‐Dávila,et al.  The influence of island generated eddies on the carbon dioxide system, south of the Canary Islands , 2006 .

[17]  G. Luther,et al.  Chemistry of iron sulfides. , 2007, Chemical reviews.

[18]  C. Culberson,et al.  MEASUREMENT OF THE APPARENT DISSOCIATION CONSTANTS OF CARBONIC ACID IN SEAWATER AT ATMOSPHERIC PRESSURE1 , 1973 .

[19]  Octavio Llinás,et al.  The interannual variability of oceanic CO2 parameters in the northeast Atlantic subtropical gyre at the ESTOC site , 2007 .

[20]  E. Baker,et al.  Submarine hydrothermal activity along the mid‐Kermadec Arc, New Zealand: Large‐scale effects on venting , 2007 .

[21]  P. Sedwick,et al.  Chemistry of hydrothermal solutions from Pele's Vents, Loihi Seamount, Hawaii , 1992 .

[22]  F. Millero,et al.  The products from the oxidation of H2S in seawater , 1993 .

[23]  F. Millero,et al.  Oxidation of nanomolar levels of Fe(II) with oxygen in natural waters. , 2005, Environmental science & technology.

[24]  F. Millero,et al.  Oxidation of iron (II) nanomolar with H2O2 in seawater , 2005 .

[25]  M. Moreno,et al.  Monitoring the volcanic unrest of El Hierro (Canary Islands) before the onset of the 2011–2012 submarine eruption , 2012 .

[26]  Kenneth H. Rubin,et al.  Active submarine eruption of boninite in the northeastern Lau Basin , 2011 .

[27]  F. Millero,et al.  A comparison of the equilibrium constants for the dissociation of carbonic acid in seawater media , 1987 .

[28]  M. González‐Dávila,et al.  Seasonal and interannual variability of sea‐surface carbon dioxide species at the European Station for Time Series in the Ocean at the Canary Islands (ESTOC) between 1996 and 2000 , 2003 .

[29]  P. Sedwick,et al.  Gas-rich submarine exhalations during the 1989 eruption of Macdonald Seamount , 1991 .

[30]  Tom Simkin,et al.  Volcanoes of the World: an Illustrated Catalog of Holocene Volcanoes and their Eruptions , 2013 .

[31]  N. Mitchell.  Submarine volcanism: Hot, cracking rocks deep down , 2012 .

[32]  V. Mantas,et al.  Plumes of discolored water of volcanic origin and possible implications for algal communities. The case of the Home Reef eruption of 2006 (Tonga, Southwest Pacific Ocean) , 2011 .

[33]  Nicolas Gruber,et al.  The Oceanic Sink for Anthropogenic CO2 , 2004, Science.

[34]  E. Baker,et al.  Chemistry of hydrothermal plumes above submarine volcanoes of the Mariana Arc , 2009 .

[35]  P. Croot,et al.  Subduction zone volcanic ash can fertilize the surface ocean and stimulate phytoplankton growth: Evidence from biogeochemical experiments and satellite data , 2007 .

[36]  E. Baker,et al.  Extensive and Diverse Submarine Volcanism and Hydrothermal Activity in the NE Lau Basin , 2009 .

[37]  J. Resing,et al.  THE CHEMISTRY OF LAVA-SEAWATER INTERACTIONS : THE GENERATION OF ACIDITY , 1999 .

[38]  Hervé Guillou,et al.  K-Ar ages and magnetic stratigraphy of a hotspot-induced, fast grown oceanic island: El Hierro, Canary Islands , 1996 .

[39]  F. Millero.  The pH of estuarine waters , 1986 .

[40]  K. Nogami,et al.  Chemical Composition of Discolored Seawater around Satsuma-Iwojima, Kagoshima, Japan , 1993 .

[41]  M. E. L C H O R G O N Z A Ä L E Z-D A Ä V I L A, † A N D.  Oxidation of Nanomolar Levels of Fe ( II ) with Oxygen in Natural Waters , 2022 .

[42]  P. Vélez-Belchí,et al.  The submarine volcano eruption at the island of El Hierro: physical-chemical perturbation and biological response , 2012, Scientific Reports.

[43]  D. Wallace,et al.  MS Excel Program Developed for CO2 System Calculations , 2011 .