Melchor González‐Dávila

Universidad de Las Palmas de Gran Canaria

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J. Magdalena Santana‐Casiano

Universidad de Las Palmas de Gran Canaria

228

Aridane G. González

Universidad de Las Palmas de Gran Canaria

David González-Santana

Université de Bretagne Occidentale

E. Fraile‐Nuez

Instituto Español de Oceanografía

Mario Hoppema

Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung

Frank J. Millero

University of Miami

Fı́z F. Pérez

Instituto de Investigacións Mariñas

Are Olsen

University of Bergen

Aida F. Rı́os

Instituto de Investigacións Mariñas

Andrew Watson

University of Exeter

Cooperative Institutions

Centre National de la Recherche Scientifique

Universidad de Las Palmas de Gran Canaria

National Oceanic and Atmospheric Administration

Consejo Superior de Investigaciones Científicas

Instituto Español de Oceanografía

National Oceanography Centre

Sorbonne Université

Institut de Recherche pour le Développement

University of Southampton

GEOMAR Helmholtz Centre for Ocean Research Kiel

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Papers

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A global monthly climatology of total alkalinity: a neural network approach

Daniel Broullón Fı́z F. Pérez A. Velo Mario Hoppema Are Olsen

Abstract. Global climatologies of the seawater CO2 chemistry variables are necessary to assess the marine carbon cycle in depth. The seasonal variability should be adequately captured in them to properly address issues such as ocean acidification. Total alkalinity (AT) is one variable of the seawater CO2 chemistry system involved in ocean acidification and frequently measured during campaigns assessing the marine carbon cycle. We took advantage of the data product Global Ocean Data Analysis Project version 2 (GLODAPv2) to extract the relations between the drivers of the AT variability and this variable using a neural network to generate a monthly climatology. 99% of the GLODAPv2 dataset used was modelled by the network with a root-mean-squared error (RMSE) of 5.1 µmol kg-1. The validation carried out using independent datasets revealed the good generalization of the network. Five ocean time-series stations used as an independent test showed an acceptable RMSE in the range of 3.1-6.2 µmol kg-1. The successful modeling of the monthly variability of AT in the time-series makes our network a good candidate to generate a monthly climatology. It was obtained passing the climatologies of the World Ocean Atlas 2013 (WOA13) through the network. The spatiotemporal resolution of the climatology is determined by the one of WOA13: 1ºx1º in the horizontal, 102 depth levels (0-5500m) in the vertical, and 12 months. We offer the product as a service to the scientific community at the data repository of the Spanish National Research Council (CSIC; doi: http://dx.doi.org/10.20350/digitalCSIC/8564) with the purpose to contribute to a continuous improvement of the understanding of the global carbon cycle.

Alkalinity

10.5194/essd-2018-111

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Citations (10)

The role of phytoplankton cells on the control of heavy metal concentration in seawater

Marine Chemistry (1995)

Melchor González‐Dávila

Trace metal

Limiting

Extracellular polymeric substance

10.1016/0304-4203(94)00045-f

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Citations (134)

Surface Ocean CO<sub>2</sub> Atlas (SOCAT) gridded data products

Christopher L. Sabine S. Hankin H. Koyuk Dorothée C. E. Bakker Benjamin Pfeil

Abstract. A well documented, publicly available, global data set for surface ocean carbon dioxide (CO2) parameters has been called for by international groups for nearly two decades. The Surface Ocean CO2 Atlas (SOCAT) project was initiated by the international marine carbon science community in 2007 with the aim of providing a comprehensive, publicly available, regularly updated, global data set of marine surface CO2, which had been subject to quality control (QC). SOCAT version 1.5 was made public in September 2011 and holds 6.3 million quality controlled surface CO2 data from the global oceans and coastal seas, spanning four decades (1968–2007). The SOCAT gridded data is the second data product to come from the SOCAT project. Recognizing that some groups may have trouble working with millions of measurements, the SOCAT gridded product was generated to provide a robust regularly spaced fCO2 product with minimal spatial and temporal interpolation which should be easier to work with for many applications. Gridded SOCAT is rich with information that has not been fully explored yet, but also contains biases and limitations that the user needs to recognize and address.

Data set

Interpolation

10.5194/essdd-5-781-2012

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Citations (10)

Copper toxicity leads to accumulation of free amino acids and polyphenols in Phaeodactylum tricornutum diatoms

Environmental Science and Pollution Research (2023)

Paula Santiago‐Díaz Argimiro Rivero Milagros Rico Aridane G. González Melchor González‐Dávila

Abstract This work is focused on the effect of lethal and sub-lethal copper (Cu) concentrations on the free amino acid and polyphenol production by the marine diatom Phaeodactylum tricornutum ( P. tricornutum ) after 12, 18, and 21 days of exposure. The concentrations of 10 amino acids (arginine, aspartic acid, glutamic acid, histidine, lysine, methionine, proline, valine, isoleucine, and phenylalanine) and 10 polyphenols (gallic acid, protocatechuic acid, p -coumaric acid, ferulic acid, catechin, vanillic acid, epicatechin syringic acid, rutin, and gentisic acid) were measured by RP-HPLC. Under lethal doses of Cu, free amino acids reached levels significantly higher than those in the control cells (up to 21.9 times higher), where histidine and methionine showed the highest increases (up to 37.4 and 65.8 times higher, respectively). The total phenolic content also increased up to 11.3 and 5.59 times higher compared to the reference cells, showing gallic acid the highest increase (45.8 times greater). The antioxidant activities of cells exposed to Cu were also enhanced with increasing doses of Cu(II). They were evaluated by 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical scavenging ability (RSA), cupric ion reducing antioxidant capacity (CUPRAC), and ferric reducing antioxidant power (FRAP) assays. Malonaldehyde (MDA) exhibited the same tendency: cells grown at the highest lethal Cu concentration yielded the highest MDA level. These findings reflect the involvement of amino acids and polyphenols in protective mechanisms to overcome the toxicity of copper in marine microalgae. Graphical Abstract

Phaeodactylum tricornutum

Vanillic acid

Gentisic acid

Isoleucine

10.1007/s11356-023-25939-0

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Citations (13)

The water column distribution of carbonate system variables at the ESTOC site from 1995 to 2004

Biogeosciences (2010)

Melchor González‐Dávila J. Magdalena Santana‐Casiano María José Rueda O. Llinás

Abstract. The accelerated rate of increase in atmospheric carbon dioxide and the substantial fraction of anthropogenic CO2 emissions absorbed by the oceans are affecting the anthropocenic signatures of seawater. Long-term time series are a powerful tool for investigating any change in ocean bio-geochemistry and its effects on the carbon cycle. We have evaluated the ESTOC (European Station for Time series in the Ocean at the Canary islands) observations of measured pH (total scale at 25 °C) and total alkalinity plus computed total dissolved inorganic carbon concentration (CT) from 1995 to 2004 for surface and deep waters, by following all changes in response to increasing atmospheric carbon dioxide. The observed values for the surface partial pressure of CO2 from 1995 to 2008 were also taken into consideration. The data were treated to better understand the fundamental processes controlling vertical distributions in the Eastern North Atlantic Ocean and the accumulation of anthropogenic CO2, CANT. CT at constant salinity, NCT, increased at a rate of 0.85 μmol kg−1 yr−1 in the mixed layer, linked to an fCO2 increase of 1.7±0.7 μatm yr−1 in both the atmosphere and the ocean. Consequently, the mixed layer at ESTOC site has also become more acidic, −0.0017±0.0003 units yr−1, whereas the carbonate ion concentrations and CaCO3 saturation states have also decreased over time. NCT increases at a rate of 0.53, 0.49 and 0.40 μmol kg−1 yr−1 at 300, 600, and 1000 m, respectively. The general processes controlling the vertical variations of alkalinity and the inorganic carbon distribution were computed by considering the pre-formed values, the production/decomposition of organic matter and the formation/dissolution of carbonates. At 3000 m, 30% of the inorganic carbon production is related to the dissolution of calcium carbonate, increasing to 35% at 3685 m. The total column inventory of anthropogenic CO2 for the decade was 66±3 mol m−2. A model fitting indicated that the column inventory of CANT increased from 61.7 mol m−2 in the year 1994 to 70.2 mol m−2 in 2004. The ESTOC site is presented as a reference site to follow CANT changes in the Northeast Atlantic Sub-tropical gyre.

Alkalinity

Saturation (graph theory)

Mixed layer

Total inorganic carbon

10.5194/bg-7-3067-2010

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Citations (120)

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

EGUGA (2014)

J. Magdalena Santana‐Casiano Melchor González‐Dávila E. Fraile‐Nuez

Ocean Acidification

Vulcanian eruption

Iron fertilization

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The submarine volcano eruption at the island of El Hierro: physical-chemical perturbation and biological response

AGUFM (2013)

E. Fraile‐Nuez J. Magdalena Santana‐Casiano Melchor González‐Dávila

Submarine volcano

Vulcanian eruption

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Fe(III) reduction in the presence of catechol in natural waters

J. Magdalena Santana‐Casiano Melchor González‐Dávila Frank J. Millero

Catechol

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Citations (1)

First Macro-Colonizers and Survivors Around Tagoro Submarine Volcano, Canary Islands, Spain

Geosciences (2019)

Ana Sotomayor-García José L. Rueda Olga Sánchez-Guillamón Javier Urra J.T. Vázquez

Tagoro, the youngest submarine volcano of the Canary Islands, erupted in 2011 South of El Hierro Island. Pre-existing sea floor and inhabiting biological communities were buried by the newly erupted material, promoting the appearance of new habitats. The present study pursues to describe the first metazoans colonizing different new habitats formed during the eruption and to create precedent on this field. Through dredge and remote operated vehicle samplings, five main habitat types have been detected based on the substrate type and burial status after the eruption. Inside the Tagoro volcanic complex (TVC), two new habitats are located in and around the summit and main craters—hydrothermal vents with bacterial mats and sulfurous-like fields mainly colonized by small hydrozoan colonies. Two other habitats are located downslope the TVC; new hard substrate and new mixed substrate, holding the highest biodiversity of the TVC, especially at the mixed bottoms with annelids (Chloeia cf. venusta), arthropods (Monodaeus couchii and Alpheus sp.), cnidarians (Sertularella cf. tenella), and molluscs (Neopycnodonte cochlear) as the first colonizers. An impact evaluation was done comparing the communities of those habitats with the complex and well-established community described at the stable hard substrate outside the TVC, which is constituted of highly abundant hydrozoans (Aglaophenia sp.), antipatharians (Stichopates setacea and Antipathes furcata), and colonizing epibionts (e.g., Neopycnodonte cochlear). Three years after the eruption, species numbers at Tagoro were still low compared to those occurring at similar depths outside the TVC. The first dominant species at the TVC included a large proportion of common suspension feeders of the circalittoral and bathyal hard bottoms of the area, which could have exploited the uncolonized hard bottoms and the post eruptive fertilization of water masses.

Submarine volcano

10.3390/geosciences9010052

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Citations (16)

Effects of organic compounds in the oxidation rate of Fe(II) in natural waters

J. Magdalena Santana‐Casiano Melchor González‐Dávila MJ Rodiguez PJ Millero

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Citations (0)