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  • 2020-2024  (9,646)
  • 1975-1979  (9)
  • 2024  (9,646)
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  • 1
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    2D multichannel seismic reflection processed data (GI Gun working area dataset) of RV SONNE during cruise SO292, Queensland Plateau, Coral Sea (2024)
    PANGAEA
    Details
    Publication Date: 2024-07-01
    Description: The seismic data were collected on the Queensland Plateau during RV SONNE expedition SO292 in spring 2022 (Betzler et al., 2022). The seismic signals were generated by two simultaneously released GI-Gun (true GI-Modus; primary volume of 45 in3) and a Mini-GI source (true GI-Modus; primary volume of 15 in3), towed 41 m behind the ship's stern and in a water depth of ca. 2.5 m. Sources were released by a GPS-controlled PC every 18.75 m at 160 bar. To synchronize seismic sources and trigger the recording system, a SureShot trigger system was used. This system allowed to display and adjust the source signatures measured by hydrophones attached to the seismic sources for each shot and therefore enabled an online quality control during the watchkeeping. The streamer was a Hydroscience Technologies SeaMUX 144-channel system with an active length of 600 m and symmetric group interval. The recording length was set to 4 s, the sample interval was 1 ms. Raw data were stored in SEG-Y format. All seismic profiles were processed on board with the 2021 VISTA® desktop seismic data processing software by Schlumberger. The main processing steps were Bandpass filtering (18/25 – 350/450 Hz), velocity analysis (every 25-500 CMP), spherical divergence correction, NMO-correction and stack, FD migration, topmute, data enhancement (white noise removal, fx deco), scaling. Processed data contained in this dataset are stored as SEG-Y. UTM coordinates (UTM zone 55) are stored at trace header position 181 (4-byte) and 185 (4-byte).
    Keywords: Binary Object; Binary Object (File Size); Binary Object (MD5 Hash); Binary Object (Media Type); Coral Sea; ICECARB; Profile ID; SEIS; Seismic; Seismic reflection profile; SEISREFL; SO292; SO292_43-1; Sonne_2; Start of data file recording, latitude; Start of data file recording, longitude; Stop of data file recording, latitude; Stop of data file recording, longitude
    Type: Dataset
    Format: text/tab-separated-values, 42 data points
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  • 2
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    Amplified seasonality in western Europe in a warmer world (2024)
    In:  Science Advances vol. 10 no. 20
    Details
    Publication Date: 2024-06-30
    Description: Documenting the seasonal temperature cycle constitutes an essential step toward mitigating risks associated with extreme weather events in a future warmer world. The mid-Piacenzian Warm Period (mPWP), 3.3 to 3.0 million years ago, featured global temperatures approximately 3°C above preindustrial levels. It represents an ideal period for directed paleoclimate reconstructions equivalent to model projections for 2100 under moderate Shared Socioeconomic Pathway SSP2- 4.5. Here, seasonal clumped isotope analyses of fossil mollusk shells from the North Sea are presented to test Pliocene Model Intercomparison Project 2 outcomes. Joint data and model evidence reveals enhanced summer warming (+4.3° ± 1.0°C) compared to winter (+2.5° ± 1.5°C) during the mPWP, equivalent to SSP2-4.5 outcomes for future climate. We show that Arctic amplification of global warming weakens mid- latitude summer circulation while intensifying seasonal contrast in temperature and precipitation, leading to an increased risk of summer heat waves and other extreme weather events in Europe’s future.
    Keywords: Aragonitic bivalve shells ; Sea-surface temperature ; North-Sea ; Atmospheric circulation ; PLIOMIP2 simulations ; Arctic amplification ; Marine heatwaves ; Summer drought ; Wadden Sea ; Pliocene
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
    Format: application/pdf
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  • 3
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    Informe : Los estudios genéticos en la merluza Merluccius hubbsi (Marini 1933) entre los 32°S y los 50°S de latitud. Análisis de la información genética generada en la DINARA. (2024)
    DINARA | Montevideo, Uruguay
    Details
    Publication Date: 2024-06-30
    Description: PNUD
    Description: Unpublished
    Description: Non Refereed
    Keywords: ASFA_2015::P::Population genetics ; ASFA_2015::H::Hake fisheries
    Repository Name: AquaDocs
    Type: Report
    Format: 21pp.
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  • 4
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    La investigación marina en Colombia una actividad de prioridad nacional (2024)
    Details
    Publication Date: 2024-06-30
    Description: Las aguas marinas cubren el 70 % de la tierra. Encierran riquezas animales, vegetales y minerales, cuyo valor real es aún incalculable. Sus aguas poseen una riqueza de compuestos orgánicos e inorgánicos, comparable o superior a la de la tierra. La riqueza pesquera, fuente de proteína animal, ha sido explotada con un fin comercial exclusivamente, sin mayores bases científicas acerca de la biología y ecología de las especies, lo que se ha constituido en una sobreexplotación, que ya ha hecho disminuir y casi desaparecer a varios de sus representantes. Los peces, lo mismo que muchos invertebrados / marinos, son explotados a menudo por monopolios nacionales e internacionales, utilizando la mayoría de las veces, técnicas muy destructivas, pues en muchas ocasiones sólo el 20 ó 30 % de los arrastres son aprovechados. Es decir, sólo los mejores ejemplares son aceptados por los mercados internacionales, y el resto, que bien pudiera ser utilizado en su alimentación por miles de personas, es arrojado de nuevo al mar, como residuo inservible.
    Description: Published
    Description: Refereed
    Keywords: Investigación Marina y Costera ; ASFA_2015::M::Marine fish
    Repository Name: AquaDocs
    Type: Journal Contribution
    Format: 1-6 pp
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  • 5
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    Análisis del desembarque de Condrictios por la flota de arrastre costero uruguaya en el Río de la Plata y Zona Común de Peca. Año 2012 (2024)
    DINARA | Montevideo, Uruguay
    Details
    Publication Date: 2024-06-30
    Description: Se analizó la información de desembarque proveniente de los partes de pesca de la flota industrial costera en el año 2012 para las principales especies de Condrictios. En dicho año la flota realizó 984 viajes de pesca y un total de 8.471 lances en el área del Río de la Plata (RP) y la Zona Común de Pesca (ZCP). Las especies de Condrictios con mayor volumen desembarcado fueron el gatuzo Mustelus schmitti (254 t), el angelito Squatina guggenheim (115 t) y la raya lisa Rioraja agassizi (53 t), totalizando las tres especies el 92% del volumen desembarcado de Condrictios. Un total de 434 t fue desembarcado dentro de la categoría “Varios”, la cual puede enmascarar capturas de cualquier especie. Las épocas del año con mayor volumen desembarcado, teniendo en cuenta el esfuerzo pesquero, fueron primavera y verano, siendo octubre y noviembre los meses de mayor rendimiento para M. schmitti y noviembre y diciembre para S. guggenheim. Los valores más altos de captura por unidad de esfuerzo de angelito ocurrieron en la zona costera frente a Rocha, mientras que los de gatuzo ocurrieron frente a la costa de Canelones y Maldonado fuera del RP. Los mayores rendimientos para la raya lisa ocurrieron en el área oceánica al este de Punta del Este. La presencia en los partes de pesca de la categoría “Varios”, el gran número de lances negativos (alta ausencia) de Condrictios, así como la cuantificación de algunas especies en “piezas” y no en peso, demostraron que la captura de las diferentes especies de Condrictios está subestimada. Es esencial una mejora en la calidad de los datos de captura retenida y también descartada de las diferentes especies del grupo Condrictios para evaluar el estado de los stocks de este grupo de peces en el área de estudio.
    Description: Published
    Description: Refereed
    Keywords: Chondrichthyans ; ASFA_2015::T::Trawling
    Repository Name: AquaDocs
    Type: Report
    Format: 24pp.
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  • 6
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    Marine habitat mapping. (2024)
    European Marine Board | Ostend, Belgium
    Details
    Publication Date: 2024-06-30
    Description: EMB Future Science Brief No. 11 ‘Marine habitat mapping’ presents science and policy needs and recommendations to advance next-generation marine habitat mapping. This document highlights current methods and future trends in the acquisition of data from the seabed and water column via remote sensing and direct, in situ techniques. It discusses combining data to produce maps using modelling approaches and presents recommendations for adopting fit-for-purpose habitat classification schemes. It also provides an overview of what has been mapped and where within the European sea-basins, highlights the need to increase the quality and resolution of marine habitat maps. It identifies critical gaps in habitat types and geographic extent, including the coastal areas, the deep sea, Natura 2000 sites and other Marine Protected Areas across all regional seas. Finally, it describes the need to improve the assessment and communication of uncertainty and confidence in maps, and to make maps more easily accessible to a variety of stakeholders to increase their value for end-users and to the public for Ocean literacy.
    Description: Published
    Description: Refereed
    Keywords: marine habitat mapping ; conservation ; restoration
    Repository Name: AquaDocs
    Type: Report
    Format: 74pp.
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  • 7
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    Características poblacionales de Diadema antillarum (Philippi, 1845) (Echinoidea: Diadematidae) en arrecifes de la región noroccidental Cuba. (2024)
    Details
    Publication Date: 2024-06-30
    Description: Diadema antillarum es considerada como el principal invertebrado herbívoro de los arre- cifes de coral del Caribe. Debido a la significación que representa esta especie, en esta investigación se evaluaron indicadores poblacionales de la misma en las crestas arrecifales de playa Baracoa y Rincón de Guanabo, costa noroccidental de Cuba. Los muestreos se realizaron en enero-marzo de 2021. Se estimó la densidad media, diámetro medio de la testa, porcentaje de juveniles y adultos, de agregaciones y albinismo de D. antillarum para cada cresta. Las variables fueron evaluadas utilizando un transecto de banda de 10 m de largo por 1 m de ancho. La densidad media de D. antillarum en playa Baracoa (19.28 ± 14.40 ind./10 m2) fue superior al valor reportado en Rincón de Guanabo (0.78 ± 0.43 ind./10 m2) y en algunos arrecifes del Caribe. En playa Baracoa el porcentaje de indivi- duos adultos representa el 95.25 % del total. El diámetro medio de D. antillarum en playa Baracoa (5.53 ± 1.76 cm) y Rincón de Guanabo (3.05 ± 1.56 cm) resultó ser inferior al reportado en algunos arrecifes del Caribe. En playa Baracoa se encontraron 148 agrega- ciones y 40 individuos albinos. El número bajo de individuos en el Rincón de Guanabo (47) ha generado varias hipótesis que necesitaran ser corroboradas en el futuro. No se en- contró evidencia de la pandemia que sufre D. antillarum en el Caribe, lo cual se considera un indicador positivo. Se recomienda evaluar el manejo (restauración) de la especie en la cresta del Rincón de Guanabo.
    Description: Diadema antillarum is considered the main herbivorous invertebrate of Caribbean co- ral reefs. Due to the significance of this specie for coral reefs, our research focused on evaluating ecological indicators of D. antillarum in the reef crests of Baracoa beach and Rincón de Guanabo on the northwestern coast of Cuba. The study was conducted between January and March of 2021. We assessed the mean density, test mean diameter, percentage of juveniles and adults, aggregations, and instances of albinism in D. anti- llarum for each crest. These variables were measured using a 10-m-long and 1-m-wide belt transect. The mean density of D. antillarum in Baracoa beach (19.28 ± 14.40 ind./10 m2) was higher than that in Rincón de Guanabo (0.78 ± 0.43 ind./10 m2) and other Caribbean reefs. In Baracoa beach, adults accounted 95.25 % of the total individuals found in this crest. The mean diameter of D. antillarum in Baracoa beach (5.53 ± 1.76 cm) and Rincón de Guanabo (3.05 ± 1.56 cm) was lower than that observed in other Caribbean reefs. In Baracoa beach, we identified 148 aggregations and 40 individuals with albinism. The low number (47) of D. antillarum individuals in Rincón de Guanabo generates new hypothesis that have to be tested in the future. No evi- dence of the pandemic affecting D. antillarum in the Ca- ribbean was found, which is considered a positive indicator. It is recommended to evaluate management (restoration) for the species in the Rincón de Guanabo crest.
    Description: Published
    Description: Refereed
    Keywords: Albinismo ; Conducta ; Crestas de arrecifes ; Erizo negro de espinas largas ; Herbivoría ; Albinism ; Behaviour ; Reef´s crests ; Black sea urchin with long spines ; Herbivory
    Repository Name: AquaDocs
    Type: Journal Contribution
    Format: pp.115-140
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  • 8
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    Modulation of Equatorial Currents and Tropical Instability Waves During the 2021 Atlantic Niño (2024)
    AGU (American Geophysical Union) | Wiley
    Details
    Publication Date: 2024-06-30
    Description: In the boreal summer of 2021, the equatorial Atlantic experienced the strongest warm event, that is, Atlantic Niño, since the beginning of satellite observations in the 1970s. Such events have far‐reaching impacts on large‐scale wind patterns and rainfall over the surrounding continents. Yet, developing a paradigm of how Atlantic Niño interacts with the upper‐ocean currents and intraseasonal waves remains elusive. Here we show that the equatorial Kelvin wave associated with the onset of the 2021 Atlantic Niño modulated both the background flow and the eddy flux of the equatorial upper‐ocean circulation, causing an extremely weak and delayed tropical instability wave (TIW) season. TIW‐induced variations of sea surface temperature (SST), sea surface salinity, sea surface height, and eddy temperature advection were exceptionally weak during May to July, the climatological peak of TIW activity, but rebounded in August when higher than normal variability was observed. Moored velocity data at 23°W show that during the peak of the 2021 Atlantic Niño from June to August, the Equatorial Undercurrent was deeper and stronger than usual. An anomalously weak eddy momentum flux strongly suppressed barotropic energy conversion north of the equator from May to July, likely contributing to low TIW activity. Reduced baroclinic energy conversion also might have played a role, as the meridional gradient of SST was sharply reduced during the Atlantic Niño. Despite extremely weak TIW velocities, modest intraseasonal variability of chlorophyll‐a (Chl‐ a ) was observed during the Atlantic Niño, due to pronounced meridional Chl‐ a gradients that partly compensated for the weak TIWs. Plain Language Summary Every few years the eastern equatorial Atlantic Ocean is significantly warmer than usual during boreal summer. Such warm events are referred to as Atlantic Niño events, and share similarities with El Niño events in the Pacific. In 2021, the strongest Atlantic Niño in at least four decades was observed in the equatorial Atlantic. This study is the first that investigates the complex interaction between Atlantic Niño, tropical Atlantic upper‐ocean currents, and equatorial waves based on various observational data sets. We show that the developing 2021 Atlantic Niño weakened both the background flow and the variability of near‐surface currents in May, which in turn largely reduced the strength of intraseasonal (20–50 days) waves that are usually generated by instability of the upper‐ocean zonal currents. As a consequence, the cooling effect that these waves usually have north of the equator and the warming effect along the equator vanished from May to July 2021. Interestingly, variability of chlorophyll concentration was enhanced, suggesting that enhanced meridional chlorophyll gradients compensated for reduced wave activity. Key Points The developing 2021 Atlantic Niño led to weaker equatorial surface currents and reduced vertical shear of upper‐ocean horizontal velocity Strong reduction of the surface flow, eddy flux, and meridional temperature gradient in May caused extremely weak and delayed tropical instability wave (TIW) season Reduced meridional TIW advection contributed to sharpen the north equatorial Chl‐ a front resulting in modest intraseasonal Chl‐ a variability
    Type: Article , PeerReviewed
    Format: text
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  • 9
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    Age model and geochemistry data of sediment core GeoTü SL167 (2024)
    PANGAEA
    Details
    Publication Date: 2024-06-29
    Description: The data sets contains the age model as well as bulk organic and n-alkane data of sediment core GeoTü SL167 to reconstruct changes of the oxygen minimum zone strength for the late Quaternary. The age model is based on 14C AMS measurements of planktonic foraminifera and is calibrated with the BACON v. 2.5.6 software for R (Blauuw & Christen, 2011) and a marine reservoir age of ΔR = 93 ± 61 years. The ΔR is based on the weighted mean of two regional marine reservoir corrections (Muscat) by Southon et al. (2002) using the marine calibration database (Reimer and Reimer, 2001, http://calib.org/marine/). Total organic carbon and nitrogen measurements were carried out with an Euro EA3000 elemental analyser and δ15N measurements with a Thermo Scientific Flash EA1112 coupled to a Finnigan MAT 252 IRMS. Total organic carbon mass accumulation rates (TOC MAR) based on calculation using the organic carbon content and total mass accumulation rates. A description of the calculation of the total mass accumulations rates is given in Burdanowitz et al 2021. The measurements of n-alkanes were carried out using Thermo Scientific Trace 1310 GC-FID and Thermo Scientific DSQ II (GC-MS). Gravity core GeoTü SL167, was retrieved at station no. 960 during R.V. METEOR cruise M74/1b in 2007 (Bohrmann et al., 2010) from the northwestern Arabian Sea off Oman, at 22°37.2'N, 59°41.5'E, 774 m water depth, core recovery 7.39 m. The sediment core was retrieved for the reconstruction of circulation and productivity changes in the eastern Mediterranean Sea during the late Quaternary with particular focus on changes in the Indian monsoon system.
    Keywords: Age model; Arabian Sea; CLICCS; Cluster of Excellence: Climate, Climatic Change, and Society; Denitrification; n-alkanes; OMZ; Quaternary
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 10
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    Measurements of the coelenteron pH in a reef coral, Stylophora pistillata, using microsensors, under light and dark conditions and in tissues with different dinoflagellate densities (2024)
    PANGAEA
    Details
    Publication Date: 2024-06-29
    Description: pH measurements in the cœlenteron (pHcoel) of a reef coral, Stylophora pistillata, were performed using the microsensor technique. Seven samples grown in long-term coral culture facilities on glass slides at the Centre Scientifique de Monaco were used for this study. Measuremetns were made using motorised micromanipulator for precise movements of the microsensor on the order of micrometres. We first performed depth profiles in the polyps and in the coenosarc in tissue with a high dinoflagellate density, under light conditions to determine the variation of pHcoel. We then measured pHcoel of polyps and coenosarc at eight light intensities, from darkness to strong illumination, which allowed us to derive a pHcoel-irradiance curve and evaluate the role of photosynthesis in influencing pH in the coelenteron. Finally, we measured pHcoel in the coenosarc under light and dark conditions in two regions of interest characterised by visually different densities of dinoflagellates residing within the coral tissue: a high dinoflagellate density (HDD) tissue at the centre of the microcolonies and a low dinoflagellate density (LDD) tissue at the edge of microcolonies. For each sample, at least three replicate measurements were performed under all conditions.
    Keywords: calcification; coenosarc; Date/time end, experiment; Date/time start, experiment; Depth in coral tissue; Dinoflagellate; Figure; Laboratory experiment; Light bulb, Nepturion, BLV HQI 150W; pH; pH, standard deviation; Photosynthesis; pH sensor, Mettler Toledo, InLab Pure Pro-ISM; mounted on Motorized micromanipulator, PyroScience, MUX2 [software Profix , PyroScience, version 4.51; Macroscope, Leica Microsystems, Z16 APO]; polyp; Portable 2-channel multimeter, Hach, HQ40D; Salinity; Stylophora pistillata, coelenteron in coenosarc, pH; Stylophora pistillata, coelenteron in coenosarc, pH, standard deviation; Stylophora pistillata, coelenteron in coenosarc in high dinoflagellate density tissues, pH; Stylophora pistillata, coelenteron in coenosarc in high dinoflagellate density tissues, pH, standard deviation; Stylophora pistillata, coelenteron in coenosarc in low dinoflagellate density tissues, pH; Stylophora pistillata, coelenteron in coenosarc in low dinoflagellate density tissues, pH, standard deviation; Stylophora pistillata, coelenteron in polyp, pH; Stylophora pistillata, coelenteron in polyp, pH, standard deviation; Stylophora pistillata, coenosarc, pH; Stylophora pistillata, coenosarc, pH, standard error; Stylophora pistillata, polyp, pH; Stylophora pistillata, polyp, pH, standard error; Temperature, water; Thermometer, Ponsel; Treatment: light intensity; Type of study
    Type: Dataset
    Format: text/tab-separated-values, 439 data points
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