Article
Environmental Sciences
J. Sanchez-Rodriguez, A. Sierra, D. Jimenez-Lopez, T. Ortega, A. Gomez-Parra, J. Forja
Summary: The study investigated the concentration of dissolved CH4 and N2O, as well as the partial pressure of CO2 in the Guadalquivir estuary. Factors such as temperature, salinity, exchange with the atmosphere, biochemical processes, and river inputs were found to influence the distribution of gases. The estuary acts as a source of these gases to the atmosphere, with positive water-atmosphere fluxes throughout the study.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Anirban Akhand, Kenta Watanabe, Abhra Chanda, Tatsuki Tokoro, Kunal Chakraborty, Hirotada Moki, Toko Tanaya, Jayashree Ghosh, Tomohiro Kuwae
Summary: Mangrove, seagrass, and coral habitats in tropical and subtropical regions are interconnected and have varying effects on CO2 dynamics and air-water fluxes. Different habitats contribute differently to atmospheric CO2, and biogeochemical processes along coastal areas play a key role in carbon cycling.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Dongseon Kim, Seon-Eun Lee, Sosul Cho, Dong-Jin Kang, Geun-Ha Park, Sok Kuh Kang
Summary: The distribution of surface fCO(2) in the northern Philippine Sea, where mesoscale eddies are common, was investigated to determine the effects of these eddies on sea-air CO2 flux. The study found that surface fCO(2) showed large spatial variations and was influenced by temperature and upwelling processes. Sea-air CO2 flux varied significantly between the different eddy types.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Biology
Suchismita Pattanaik, Pradipta Kumar Mohapatra, Debasish Mohapatra, Sanhita Swain, Chitta Ranjan Panda, Pradeep Kumar Dash
Summary: This study evaluated the air-water CO2 exchanges in two major estuaries in the northern part of the Bay of Bengal, India. The results showed that water temperature, pH, and salinity were the primary drivers of CO2 fluxes, and they correlated well with phytoplankton characteristics. Therefore, these key parameters should be taken into consideration when predicting air-water CO2 exchanges in this estuarine region.
Article
Oceanography
Neill Mackay, Andrew Watson
Summary: In the Southern Ocean south of the Polar Front, utilizing summertime observations to reconstruct wintertime pCO2surf greatly improved coverage and enhanced accuracy of flux estimates. The addition of pseudo observations initially increased outgassing, which gradually decreased over time.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Chemistry, Physical
Yuta Kaneko, Klaus S. Lackner
Summary: This paper investigates the moisture-controlled sorption of CO2 in strong-base anion exchange materials and derives an analytic form for an isotherm equation using a bottom-up approach. The isotherm theory for an alkali liquid is generalized to a strong-base anion exchange material and the final isotherm formula is validated with experimental data. The study shows that the moisture level significantly affects the K-eq(AEM)eff value of the sorbent.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Environmental Sciences
Roseli Frederigi Benassi, Tatiane Araujo de Jesus, Lucia Helena Gomes Coelho, Werner Siegfried Hanisch, Mercia Regina Domingues, Ricardo Hideo Taniwaki, Thais Araujo Goya Peduto, Danilo Oliveira da Costa, Marcelo Luiz Martins Pompeo, William J. Mitsch
Summary: The study indicates that shallow urban polluted reservoirs in tropical regions can be hotspot for CO2 and CH4 emissions, with nutrient-rich conditions leading to increased greenhouse gas emission. High concentrations of nutrients in the water column support the production of autotrophic biomass that contribute to CH4 emission. The findings highlight the importance of water quality improvement and eutrophication mitigation in highly urbanized reservoirs in tropical regions.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Geography, Physical
Jing Tian, Yongqiang Zhang, Xuanze Zhang
Summary: Using a coupled diagnostic biophysical model, this study investigated the effects of heterogeneous CO2 datasets on global gross primary production (GPP), actual evapotranspiration (ET) and water use efficiency (WUE). Results showed that CO2 heterogeneity had significant impacts on vegetation growth and water use efficiency, with CarbonTracker dataset showing the highest CO2 concentration. The effects were more pronounced in summer, with Russia being identified as a vulnerable region and areas like the Amazon rainforest experiencing an increase in GPP.
INTERNATIONAL JOURNAL OF DIGITAL EARTH
(2021)
Article
Chemistry, Physical
Stefan Zoller, Erik Koepf, Dustin Nizamian, Marco Stephan, Adriano Patane, Philipp Haueter, Manuel Romero, Jose Gonzalez-Aguilar, Dick Lieftink, Ellart de Wit, Stefan Brendelberger, Andreas Sizmann, Aldo Steinfeld
Summary: This article reports on an experimental demonstration of producing kerosene from H2O and CO2 using concentrated solar energy, with a setup relevant to industrial implementation. This is a significant milestone towards the production of sustainable aviation fuels.
Article
Environmental Sciences
D. Curbelo-Hernandez, M. Gonzalez-Davila, A. G. Gonzalez, D. Gonzalez-Santana, J. M. Santana-Casiano
Summary: The seasonal and spatial variability of CO2 system parameters and CO2 air-sea exchange were studied in the Northeast Atlantic Ocean, with temperature being the main driving factor for fCO(2,sw). The air-sea CO2 exchange was controlled by temperature, with the region acting as a CO2 sink during cold months and a source during warm months. The calculated average CO2 flux for the entire area was -2.65 +/- 0.44 TgCO(2) yr(-1) (-0.72 +/- 0.12 TgC yr(-1).
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Ecology
Jeremy Mayen, Pierre Polsenaere, Aurore Regaudie de Gioux, Christine Dupuy, Marie Vagner, Jean-Christophe Lemesle, Benoit Poitevin, Philippe Souchu
Summary: Salt marshes act as CO2 sinks and their carbon dynamics are influenced by various biogeochemical processes and factors. Ecosystem typology, tidal effects, and biological activity are major factors affecting water pCO(2) variations in salt marshes. Management practices can control the contribution of salt marshes to atmospheric CO2.
REGIONAL STUDIES IN MARINE SCIENCE
(2023)
Article
Geochemistry & Geophysics
Luke Bridgestock, Joseph Nathan, Robert Paver, Yu-Te Hsieh, Don Porcelli, Jani Tanzil, Phil Holdship, Gonzalo Carrasco, Kogila Vani Annammala, Peter W. Swarzenski, Gideon M. Henderson
Summary: Barium isotope variations can trace environmental processes, with riverine inputs being a significant source of dissolved Ba in the ocean. Estuarine processes modify the isotope composition of net riverine dissolved Ba fluxes reaching the ocean, potentially playing a key role in balancing the marine Ba isotope budget.
Article
Engineering, Chemical
Chen Zhang, Ying Ji, Chunchun Li, Yingrui Zhang, Shuzhuang Sun, Yikai Xu, Long Jiang, Chunfei Wu
Summary: This study investigates the use of three types of biochar (bamboo charcoal, wood pellet, and coconut shell) for capturing carbon dioxide after combustion. The biochar samples are modified through physical and chemical activation to enhance their carbon capture performance. Three methods are used to evaluate the CO2 adsorption capacity. The results show that activated biochar samples can achieve a CO2 capture capacity of more than 2.35 mmol•g (-1) (1 bar, 298K). The study also reveals that the performance of biochar in CO2 capture depends on various surface and textural properties, such as surface area, pore volume, O*/C ratio, and pore width.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Forestry
Aradhana J. Roberts, Liam M. Crowley, Jon P. Sadler, Tien T. T. Nguyen, Scott A. L. Hayward, Daniel B. Metcalfe
Summary: This study assesses the impact of elevated carbon dioxide on insect herbivory and the transfer of carbon and nitrogen from the canopy to the ground. The results show that leaf-level herbivory did not change significantly, but the transfer of carbon and nitrogen through herbivory increased under elevated carbon dioxide.
Article
Meteorology & Atmospheric Sciences
Leonie Esters, Anna Rutgersson, Erik Nilsson, Erik Sahlee
Summary: A study found that non-local processes in lakes contribute to errors in eddy-covariance flux estimations, depending on wind speed and direction. A correction approach was proposed to correct the flux errors caused by non-local processes and resulted in gas transfer velocities close to commonly used wind-speed based parametrizations.
BOUNDARY-LAYER METEOROLOGY
(2021)
Article
Environmental Sciences
Jesus Garcia-Lafuente, Simone Sammartino, I. Emma Huertas, Susana Flecha, Ricardo F. Sanchez-Leal, Cristina Naranjo, Irene Nadal, Maria Jesus Bellanco
Summary: The study found a decreasing trend in the velocity of Mediterranean outflow into the North Atlantic, but a shocking increase in temperature in the deepest layer in recent years, as well as gradual acidification of the outflow. Data analysis suggests that these changes may be related to the exchange of different water masses.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Multidisciplinary Sciences
Angelica Enrique-Navarro, I. Emma Huertas, Manuel Jesus Leon Cobo, Laura Prieto
Summary: This study reveals that the polyps of Cotylorhiza tuberculata could adapt to the worst-case scenario predicted for the Mediterranean Sea in the future. However, under high acidification and warming conditions, their ability to properly strobilate and produce healthy ephyrae will be more vulnerable to environmental factors induced by climate change, ultimately affecting medusae recruitment and the population dynamics of the species.
Article
Environmental Sciences
Alexandra Rosa, Claudio Cardoso, Rui Vieira, Ricardo Faria, Ana R. Oliveira, Gabriel Navarro, Rui M. A. Caldeira
Summary: The study reveals the role of land runoff in increasing nutrient concentration in waters surrounding mountainous islands. The impact of flash flood events on coastal waters is analyzed using satellite data and numerical modeling, providing insights into the spatial and temporal variability of wind, precipitation, and river discharges.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
Isabel Caballero, Alejandro Roman, Antonio Tovar-Sanchez, Gabriel Navarro
Summary: In this study, high-resolution satellite imagery was used to monitor seawater quality during the 2021 volcanic eruption on La Palma Island. The study successfully characterized the evolution of the new lava delta and its impact on the marine environment. The results showed that the deposition of volcanic ash and material resulted in increased turbidity, but there was no significant increase in chlorophyll-a concentration and no observed algal blooms.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Mar Roca, Gabriel Navarro, Javier Garcia-Sanabria, Isabel Caballero
Summary: Estuarine degradation is a global concern, and this study focuses on the highly modified Guadiaro estuary in Spain. By utilizing the Sentinel-2 satellites and the GEE platform, the study monitors the estuary for a 4-year period. The results indicate a closure trend of the estuary mouth and the absence of clear seasonal patterns. This study highlights the potential of Sentinel-2 and GEE for estuarine monitoring and its contribution to coastal and ecosystem-based management.
Article
Environmental Sciences
Angelica Enrique-Navarro, Emma Huertas, Vesna Flander-Putrle, Ana Bartual, Gabriel Navarro, Javier Ruiz, Alenka Malej, Laura Prieto
Summary: Photosymbiosis with host-specific dinoflagellates is a widespread relationship in marine organisms. This study examines the distribution, composition, and characteristics of endosymbiotic dinoflagellates in the Mediterranean jellyfish Cotylorhiza tuberculata. It finds that the jellyfish tissue protects the photosymbionts from ultraviolet radiation and provides optimal light conditions for photosynthesis, which may contribute to the success of this population.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Geography, Physical
Alejandro Roman, Gabriel Navarro, Isabel Caballero, Antonio Tovar-Sanchez
Summary: This study compares the potential of a high-spatial resolution multispectral sensor embedded in a UAV with medium resolution satellite remote sensing in monitoring the characteristics of the Antarctic penguin colony ecosystem. The use of UAV outperforms satellite imagery in characterizing the substrate due to higher spatial resolution, and the combination of both sensors can provide a broader and more precise view of the changing elements of these ecosystems over time.
GISCIENCE & REMOTE SENSING
(2022)
Article
Multidisciplinary Sciences
Susana Flecha, Alex Gimenez-Romero, Joaquin Tintore, Fiz F. Perez, Eva Alou-Font, Manuel A. Matias, Iris E. Hendriks
Summary: This study evaluated the pH variability at two sites in the coastal area of the Balearic Sea and used recurrent neural networks to predict and fill data gaps. The results show that the pH in this region decreases at a rate of approximately 0.0020 units per year.
SCIENTIFIC REPORTS
(2022)
Article
Environmental Sciences
Isabel Caballero, Mar Roca, Juan Santos-Echeandia, Patricia Bernardez, Gabriel Navarro
Summary: This study examines the evolution of water quality descriptors in Mar Menor, the largest coastal lagoon in the Western Mediterranean Sea, during the ecological crisis in 2021. The use of Landsat-8 and Sentinel-2 satellites provides precise results of water quality variables, allowing for the identification of critical areas and early warning systems. The methodology proves to be suitable for capturing the spatiotemporal distribution of water quality variables in a cost-effective way.
Article
Environmental Sciences
Alejandro Roman, Antonio Tovar-Sanchez, Adam Gauci, Alan Deidun, Isabel Caballero, Emanuele Colica, Sebastiano D'Amico, Gabriel Navarro
Summary: Remote-sensing ocean colour studies have been used to determine coastal water quality, biodiversity, and nutrient availability. Unmanned Aerial Vehicles (UAVs) with multispectral sensors have enabled water-quality studies of coastal waters. This study evaluates the use of a five-band multispectral sensor mounted on a UAV to derive scientifically valuable water parameters and presents a new Python workflow for generating orthomosaic in aquatic areas. The results show improved water-quality details at centimetre-scale and provide valid Chl-a and TSS values for the studied regions.
Article
Environmental Sciences
Susana Flecha, Diego Rueda, Mercedes de la Paz, Fiz F. Perez, Eva Alou-Font, Joaquin Tintore, Iris E. Hendriks
Summary: This study reports on methane concentrations and air-sea fluxes in the coastal area of the Balearic Islands Archipelago. The results show that methane concentrations in seawater ranged from 2.7 to 10.9 nM during the sampling period, with no significant differences between sampling sites. The estimated methane fluxes varied between 0.2 and 9.7 mu mol m-2 d-1, following a seasonal pattern, and all sites behaved as weak methane sources throughout the sampling period.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Encarni Medina-Lopez, Gabriel Navarro, Juan Santos-Echeandia, Patricia Bernardez, Isabel Caballero
Summary: This study analyzes the macroalgal bloom that occurred in Mar Menor coastal lagoon in 2022 using machine learning techniques applied to satellite imagery. The methodology successfully identifies the bloom locations with high accuracy and provides insights into key parameters contributing to the classification of algal pixels. The findings can support early warning and mitigation strategies for water quality deterioration and emphasize the usefulness of satellite observations for ecological and crisis management at local and regional scales.
Article
Geosciences, Multidisciplinary
Ismael Hernandez-Carrasco, Vincent Rossi, Gabriel Navarro, Antonio Turiel, Annalisa Bracco, Alejandro Orfila
Summary: Using Lagrangian diagnosis and satellite-derived data, we investigated the conditions that lead to episodic diatom blooms in oligotrophic open waters. Our findings show that flow structures with high Lagrangian coherence rate (LCR) and elevated eddy kinetic energy and vorticity sustain high diatom concentrations in the sunlit layers. This study reveals new dynamical aspects of geophysical turbulence and their biological impacts.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Remote Sensing
Sandra Paola Viana-Borja, Angels Fernandez-Mora, Richard P. Stumpf, Gabriel Navarro, Isabel Caballero
Summary: Nearshore bathymetry is a crucial parameter in coastal studies, but regular and continuous measurements are lacking. Satellite-derived bathymetry (SDB) provides a low-cost and efficient alternative using space mission data. This study applies a log-transformed band ratio SDB model in the Western Mediterranean Sea, achieving accurate depths with a mean bias of 0.02 m. The multi-scene approach and switching model used in this study enhance the effectiveness of SDB and contribute to a better understanding of nearshore processes in the Mediterranean Sea.
INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION
(2023)
Article
Ecology
Iris E. Hendriks, Anna Escolano-Molto, Susana Flecha, Raquel Vaquer-Sunyer, Marlene Wesselmann, Nuria Marba
Summary: The increasing rates of CO2 due to human activities are causing potential climate threats for the Mediterranean Sea, including ocean acidification and warming. Two seagrass species, Posidonia oceanica and Cymodocea nodosa, are important in mitigating climate change in this region. Seagrasses act as carbon sinks, balancing pH values during the day and storing carbon in the sediment. However, data on these processes are scattered and collected using different methodologies, making interpretation and generalization challenging. This study compares two methodologies, benthic chambers and multiparametric sensors, to analyze seagrass community metabolism and evaluate trends for these two species.