Jose Martin Hernandez-Ayon

Jose Martin Hernandez-Ayon
Autonomous University of Baja California | UABC · Instituto de Investigaciones Oceanológicas

PhD

About

106
Publications
38,190
Reads
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2,822
Citations
Citations since 2016
48 Research Items
1525 Citations
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2016201720182019202020212022050100150200250
Introduction
Jose Martin Hernandez-Ayon is a fulltime researcher at the Instituto de Investigaciones Oceanologicas (OII) of the University of Baja California (UABC); he is member of Mexico’s National System of Researchers (NSI) and his is also committee member of the Mexican Carbon Program. He received his Ph.D. in Coastal Oceanography from the UABC School of Marine Sciences in 2000 and after his degree he did a post-doctoral studies at the Scripps Institute of Oceanography, University of California, San Diego, USA. His research centers around the role of coastal oceans ecosystems in the global carbon cycle, including ocean acidification (OA) in coastal ecosystems, interactions between OA and other natural or anthropogenic stressors as hypoxia, climate change, and air-sea CO2
Additional affiliations
October 1990 - present
Autonomous University of Baja California
Position
  • Researcher

Publications

Publications (106)
Article
Full-text available
Ocean acidification (OA) has resulted in global-scale changes in ocean chemistry, which can disturb marine organisms and ecosystems. Despite its extensively populated coastline, many marine-dependent communities, and valuable economies, the Gulf of Mexico (GOM) remains a relatively understudied region with respect to acidification. In general, the...
Article
The surface waters of the Ballenas Channel (BC) are characterized by thermohaline and biogeochemical conditions that depend on the water masses present. Since these surface waters are transported into Bahía de los Ángeles (BLA), it is relevant to assess their timing, intensity and biogeochemical implications on a seasonal scale. For this purpose, t...
Article
The dynamics and distribution of the carbonate system and the processes that regulate it over the Yucatan Shelf (YS), a region of karst geology and high productivity that is influenced by submarine groundwater discharges (SGDs) and upwelling, were explored with data from two oceanographic cruises. The first oceanographic cruise was conducted in Nov...
Conference Paper
Full-text available
Resumen Desde la revolución industrial el ser humano ha incrementado la concentración de CO 2 en la atmósfera. Si bien el océano tiene la capacidad de absorber grandes cantidades de CO 2 atmosférico y amortiguar el pH, su rápido crecimiento está causando una disminución del pH y el desequilibrio del sistema de carbonatos, fenómeno conocido como aci...
Article
Full-text available
Effective data management plays a key role in oceanographic research as cruise-based data, collected from different laboratories and expeditions, are commonly compiled to investigate regional to global oceanographic processes. Here we describe new and updated best practice data standards for discrete chemical oceanographic observations, specificall...
Article
Full-text available
In the Gulf of Mexico (GoM), the upper 300 m of the water column contains a mixture of water types derived from water masses from the North Atlantic and the Caribbean Sea, namely Caribbean Surface Water (CSW), Subtropical Underwater (SUW), Gulf Common Water (GCW), and Tropical Atlantic Central Water (TACW). These are mainly altered by mesoscale pro...
Article
The epoch of the Anthropocene, a period during which human activity has been the dominant influence on climate and the environment, has witnessed a decline in oxygen concentrations and an expansion of oxygen-depleted environments in both coastal and open ocean systems since the middle of the 20th century. This paper provides a review of system-spec...
Article
Ocean acidification generates a decrease in calcium carbonate availability essential for biomineralization in organisms such as mollusks. This effect was evaluated on Panopea globosa exposing for 7 days umbonate veliger larvae to two pH treatments: experimental (pH 7.5) and control (pH 8.0). Exposure to pH 7.5 affected growth, reducing larval shell...
Article
The surface of the ocean has absorbed one-third of the CO2gas that has been released by anthropogenic activities, which has resulted in a reduction in pH and the aragonite saturation state (Ωara) with potential negative impacts in calcifying organisms, such as corals. To evaluate these effects, the natural variability present must first be understo...
Technical Report
Full-text available
El presente documento técnico, es la primera edición de un Plan de Gobernanza, que busca dar lineamientos de la estructura básica, normativa, funcionamiento, y plan de acción de la Red Latinoamericana de Acidificación del Océano (LAOCA), para coordinar de manera más eficiente los esfuerzos de investigación en Acidificación del Océano (AO) en Latino...
Book
Full-text available
Se presenta síntesis del estado del ciclo del carbono en México: agenda azul y verde
Article
Full-text available
Syntheses of carbonate chemistry spatial patterns are important for predicting ocean acidification impacts, but are lacking in coastal oceans. Here, we show that along the North American Atlantic and Gulf coasts the meridional distributions of dissolved inorganic carbon (DIC) and carbonate mineral saturation state (Ω) are controlled by partial equi...
Article
Full-text available
Multidisciplinary ocean observing activities provide critical ocean information to satisfy ever-changing socioeconomic needs and require coordinated implementation. The upper oxycline (transition between high and low oxygen waters) is fundamentally important for the ecosystem structure and can be a useful proxy for multiple observing objectives con...
Article
Full-text available
The dynamics of the Loop Current (LC) and the detached Loop Current eddies (LCEs) dominate the surface circulation of the Gulf of Mexico (GoM) and transport Caribbean Water (CW) into the gulf. In this work, 25 years (1993–2017) of daily satellite data are used to investigate the variability of these physical processes and their effect on chlorophyl...
Article
Full-text available
The oxygen minimum zone (OMZ) of Peru is recognized as a source of CO2 to the atmosphere due to upwelling that brings water with high concentrations of dissolved inorganic carbon (DIC) to the surface. However, the influence of OMZ dynamics on the carbonate system remains poorly understood given a lack of direct observations. This study examines the...
Chapter
Si bien, las lagunas costeras son ambientes de alta productividad (Contreras-Espinoza, 1993; Herrera- Silveira et al., 2006), están expuestas a distintos grados de presión humana debido a los usos directos o indirectos que se hace de ellas. Para el manejo basado en información, se requieren análisis de datos robustos que permitan reconocer la funci...
Chapter
Full-text available
El territorio mexicano se caracteriza por la presencia de diversos ambientes geomorfológicos, denominados comúnmente bajo el término de lagunas costeras (LC), que exhiben diferencias regionales debido a su origen, extensión y naturaleza. De acuerdo con de la Lanza et al. (2013) el número de lagunas costeras o cuerpos de agua reconocidos como unidad...
Technical Report
This report describes the third Gulf of Mexico Ecosystems and Carbon Cycle (GOMECC-3) cruise on board the R/V Ronald H. Brown from Key West, FL into the Gulf of Mexico and then around the coastal waters of the Gulf of Mexico in a counter-clockwise direction. The cruise took place from July 18–August 21, 2017. The effort was in support of the coasta...
Article
Full-text available
As a result of anthropogenic activities, it has been predicted that the ocean will be challenged with rising temperature, increased stratification, ocean acidification, stronger more frequent tropical storms, and oxygen depletion. In the tropical Pacific off central Mexico all these phenomena are already occurring naturally, providing a laboratory...
Article
Full-text available
The dynamics of the Loop Current (LC) and the detached Loop Current eddies (LCE’s) dominate the Gulf of Mexico's (GoM) surface layers' circulation transporting Caribbean water (CW) into the GoM. In this work, 25-years (1993–2017) of daily satellite data are used to investigate the variability of these physical processes and their effect on chloroph...
Article
Full-text available
A successful integrated ocean acidification (OA) observing network must include (1) scientists and technicians from a range of disciplines from physics to chemistry to biology to technology development; (2) government, private, and intergovernmental support; (3) regional cohorts working together on regionally specific issues; (4) publicly accessibl...
Chapter
Full-text available
Se realizó un análisis de la información publicada hasta el momento y bases de datos disponibles en términos de la distribución espacial y temporal de las concentraciones del carbono inrogánico disuelto (CID) y los flujos de CO2 océano-atmósfera (FCO2) (Bakker et al. 2016; Chapa-Balcorta et al., 2018; WOCE Hydrographic Programme, 2002) con el propó...
Chapter
Full-text available
El problema de la acidificación del océano forma parte de la agenda científica nacional del país y atiende los compromisos nacionales e internacionales de México como parte de la Estrategia Nacional de Cambio Climático y los compromisos contraídos por México ante la Convención Marco de las Naciones Unidas sobre Cambio Climático (CMNUCC). Se resalta...
Chapter
Full-text available
INTRODUCCIÓN Esta síntesis forma parte de un esfuerzo en la generación de conocimiento para informar sobre la dinámica del carbono orgánico (C org) e inorgánico (C i) en biomasas terrestres y acuáticas, incluyendo lagos, costas y océanos en México, con el fin de entender los procesos dominantes y cómo éstos son modificados en el tiempo y espacio po...
Article
Full-text available
A quantification of carbon fluxes in the coastal ocean and across its boundaries with the atmosphere, land, and the open ocean is important for assessing the current state and projecting future trends in ocean carbon uptake and coastal ocean acidification, but this is currently a missing component of global carbon budgeting. This synthesis reviews...
Article
Prolonged nitrogen (N) fertilization can impact seagrass survival and productivity; however, the effects of N enrichment pulses (e.g., upwelling or sediment resuspension) remain poorly understood. This study examined the effects of short-term (1 h) pulsing of nitrate (NO3⁻) enrichment, simulating an upwelling event, on dissolved inorganic carbon (D...
Article
Full-text available
El océano absorbe aproximadamente el 30% del CO2 liberado hacia la atmósfera por actividades antropogénicas, esto lo convierte en el más importante reservorio de carbono antropogénico en el mundo. El presente trabajo tiene como objetivos generar una base de datos nacional sobre el carbono inorgánico disuelto (CID) y los flujos océano atmósfera de C...
Article
Full-text available
In the North Pacific, variations in isopycnal depth influence the biogeochemical characteristics of the water column and the aragonite saturation horizon (ZΩa) during interannual events. The objective of this study was to assess the effect of the 2011 La Niña conditions on ZΩa in Todos Santos Bay (Baja California, Mexico) and surrounding waters. Th...
Article
Full-text available
A quantification of carbon fluxes in the coastal ocean and across its boundaries, specifically the air-sea, land-to-coastal-ocean and coastal-to-open-ocean interfaces, is important for assessing the current state and projecting future trends in ocean carbon uptake and coastal ocean acidification, but is currently a missing component of global carbo...
Article
Full-text available
The fate of the organic matter (OM) produced by marine life controls the major biogeochemical cycles of the Earth's system. The OM produced through photosynthesis is either preserved, exported towards sediments or degraded through remineralisation in the water column. The productive eastern boundary upwelling systems (EBUSs) associated with oxygen...
Article
Full-text available
The fate of the Organic Matter (OM) produced by marine life controls the major biogeochemical cycles of the Earth’s system. The OM produced through photosynthesis is either preserved, exported towards sediments or degraded through remineralisation in the water column. The productive Eastern Boundary Upwelling Systems (EBUSs) associated with Oxygen...
Poster
Full-text available
En el Pacífico Tropical frente a México Central (PTMC) se encuentra próxima a la superficie una intensa zona mínima de oxígeno (ZMO), con elevadas concentraciones de carbón inorgánico disuelto, bajo pH y un horizonte de subsaturación de aragonita somero. Es una región oceanográfica heterogénea, con fuerte estratificación térmica en la porción sur,...
Article
Full-text available
The aim of this work was to identify processes that cause surface CO2 partial pressure (pCO2W) and air-water CO2 flux (FCO2) variations at a coastal location in the California Current System, from semidiurnal to interannual time scales. Such processes may include sea breeze, upwelling, El Niño/Southern Oscillation (ENSO) cycle, and “The Blob” (stro...
Article
Full-text available
Seasonal variations of the CO2 system in seawater for coral reefs are often controlled by both chemical-biological processes and by regional oceanographic features in combination with the residence time of adjacent water. This study reports the seasonal variability of the CO2 system along a year though dissolved inorganic carbon and pH measurements...
Poster
Full-text available
Se presenta una estimación del balance del carbono en cuatro masas de agua en el Pacífico mexicano. Durante la campaña oceanográfica Glider-Marías 1506 (Junio de 2015) se realizaron lances de CTD y mediciones de Carbono Inorgánico Disuelto (CID). A partir de los datos obtenidos, se realizó un análisis hidrográfico para caracterizar la distribución...
Article
Full-text available
Ocean acidification is widely accepted as a primary threat to coral reef populations. Negative physiological effects include decreased calcification rates, heightened metabolic energy expenditure, and increased dissolution of coral skeletons. However, studies on the dissolution of coral skeletons structures under ocean acidification conditions and...
Article
Full-text available
The present study examines the temporal variability of air–water CO2 fluxes (FCO2) and seawater carbonate chemistry in a Baja California coastal lagoon during an exceptionally warm anomaly that was developed in Northeast Pacific coasts during 2014. This oceanographic condition led to a summer-like season (weak upwelling condition) during the study...
Chapter
Full-text available
In the California Current System, (CCS) the omega aragonite saturation horizon (Ωarag= 1) has been shallowed as a consequence of the intake of anthropogenic CO2 by the oceans. This Ωarag= 1 shallowing combines with the system’s upwelling results in the transport of CaCO3 subsaturated water into the continental shelf. In this work, the Ωarag= 1 dept...
Chapter
Full-text available
En este capítulo se revisa el conocimiento actual de tendencias observadas y esperadas por el Cambio Climático en los mares circundantes al territorio nacional. El conjunto de temas abordados es amplio, incluyendo 1) temperatura y contenido de energía térmica, 2) oleaje, 3) hidrografía (masas de agua), y 4) acidificación. Estos temas, sin ser exhau...
Article
Full-text available
Porites panamensis is a hermatypic coral present in the eastern Pacific Ocean. Skeletal growth parameters have been reported, but studies of the relationship between annual calcification rates and environmental controls are scarce. In this study, we investigated three aspects of the annual calcification rates of P. panam-ensis: growth parameters am...
Article
This investigation reports, for the first time, results of CO2 system variables in the Gulf of Tehuantepec, located in the Mexican tropical Pacific. We quantified the post-Tehuano concentration of dissolved inorganic carbon (DIC) and pH (April 2013). These values were used to calculate pCO2, aragonite saturation (ΩAr), and air-sea CO2 fluxes (FCO2)...
Article
Full-text available
Some land and ocean processes are related through connections (and synoptic-scale teleconnections) to the atmosphere. Synoptic-scale atmospheric (El Niño/Southern Oscillation [ENSO], Pacific Decadal Oscillation [PDO], and North Atlantic Oscillation [NAO]) decadal cycles are known to influence the global terrestrial carbon cycle. Potentially, smalle...
Article
Full-text available
Oxygen Minimum Zones (OMZ's) are important sources of CO2 to the atmosphere when physical forces bring subsurface water with high dissolved inorganic carbon (DIC) to the surface. This study examines, for the first time, the influence of the OMZ of the coastal North Eastern Tropical Pacific off Mexico on surface CO2 fluxes. We use variations in the...
Data
Full-text available