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  • 1
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    Role of Poroelasticity During the Early Postseismic Deformation of the 2010 Maule Megathrust Earthquake (2022)
    Peña, Carlos ; Metzger, Sabrina ; Heidbach, Oliver ; [et al.]
    Details
    Publication Date: 2022-09-29
    Description: Megathrust earthquakes impose changes of differential stress and pore pressure in the lithosphere‐asthenosphere system that are transiently relaxed during the postseismic period primarily due to afterslip, viscoelastic and poroelastic processes. Especially during the early postseismic phase, however, the relative contribution of these processes to the observed surface deformation is unclear. To investigate this, we use geodetic data collected in the first 48 days following the 2010 Maule earthquake and a poro‐viscoelastic forward model combined with an afterslip inversion. This model approach fits the geodetic data 14% better than a pure elastic model. Particularly near the region of maximum coseismic slip, the predicted surface poroelastic uplift pattern explains well the observations. If poroelasticity is neglected, the spatial afterslip distribution is locally altered by up to ±40%. Moreover, we find that shallow crustal aftershocks mostly occur in regions of increased postseismic pore‐pressure changes, indicating that both processes might be mechanically coupled.
    Description: Plain Language Summary: Large earthquakes modify the state of stress and pore pressure in the upper crust and mantle. These changes induce stress relaxation processes and pore pressure diffusion in the postseismic phase. The two main stress relaxation processes are postseismic slip along the rupture plane of the earthquake and viscoelastic deformation in the rock volume. These processes decay with time, but can sustain over several years or decades, respectively. The other process that results in volumetric crustal deformation is poroelasticity due to pore pressure diffusion, which has not been investigated in detail. Using postseismic surface displacement data acquired by radar satellites after the 2010 Maule earthquake, we show that poroelastic deformation may considerably affect the vertical component of the observed geodetic signal during the first months. Poroelastic deformation also has an impact on the estimation of the postseismic slip, which in turn affects the energy stored at the fault plane that is available for the next event. In addition, shallow aftershocks within the continental crust show a good, positive spatial correlation with regions of increased postseismic pore‐pressure changes, suggesting they are linked. These findings are thus important to assess the potential seismic hazard of the segment.
    Description: Key Points: A poro‐viscoelastic deformation model improves the geodetic data misfit by 14% compared to an elastic model that only accounts for afterslip. Poroelastic deformation mainly produces surface uplift and landward displacement patterns on the coastal forearc region. Neglecting poroelastic effects may locally alter the afterslip amplitude by up to ±40% near the region of maximum coseismic slip.
    Description: Helmholtz Association (亥姆霍兹联合会致力) http://dx.doi.org/10.13039/501100009318
    Keywords: ddc:551
    Language: English
    Type: doc-type:article
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  • 2
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    Expedición Seaflower: el paisaje cultural marítimo de Providencia y Santa Catalina. Resultados preliminares (2022)
    Details
    Publication Date: 2022-05-18
    Description: Providencia y Santa Catalina han sido primordiales para la comunicación y la navegación entre los diferentes territorios del Caribe y la costa colombiana. Así, a través de los siglos, la integración de actores culturales y naturales ha contribuido a la creación de un paisaje cultural marítimo. En este sentido se diluyen los límites entre la tierra y el mar, por medio de las dinámicas sociales, políticas, religiosas, militares, bélicas, económicas, comerciales y tecnológicas que se pueden observar tanto en los sitios arqueológicos como en la actualidad. El proyecto ‘Apropiación social del paisaje cultural marítimo en Providencia y Santa Catalina: caracterización del espacio náutico desde una perspectiva histórica’ pretende comprender y caracterizar las dinámicas y elementos que hacen parte del paisaje cultural marítimo de las islas a partir del análisis de diferentes fuentes de información de manera interdisciplinar (arqueología, antropología, historia, hidrografía). Sin embargo, este artículo busca enfatizar en una caracterización arqueológica no intrusiva de sitios arqueológicos que permiten comprender las dinámicas de movilidad, producción y defensa de las islas como elementos que contribuyen a la configuración del paisaje cultural marítimo.
    Description: Providencia and Santa Catalina have been essential for communication and navigation between the different territories of the Caribbean and the Colombian coast. Thus, through the centuries the integration of cultural and natural actors has contributed to the creation of a Maritime Cultural Landscape. In this sense, the boundaries between land and sea are diluted through social, political, religious, military, war, economic, commercial and technological dynamics that can be observed both in archaeological sites and nowadays. The project "Social Appropriation of the Maritime Cultural Landscape in Providencia and Santa Catalina: Characterization of the Nautical Space from a Historical Perspective" aims to understand and characterize the dynamics and elements that are part of the Maritime Cultural Landscape of the islands from the analysis of different sources of information in an interdisciplinary way (archeology, anthropology, history, hydrography). However, this article seeks to emphasize a non- intrusive archaeological characterization of archaeological sites that allow understanding the dynamics of mobility, production, and defense of the islands as elements that contribute to the configuration of the Maritime Cultural Landscape.
    Description: Published
    Description: Not Known
    Keywords: Patrimonio cultural sumergido ; Paisaje cultural marítimo ; ASFA_2015::C::Cultures ; ASFA_2015::R::Research workers ; ASFA_2015::S::Scientific research
    Repository Name: AquaDocs
    Type: Journal Contribution
    Format: pp.83-90
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  • 3
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    Expedición Seaflower: el paisaje cultural marítimo de Providencia y Santa Catalina. Resultados preliminares (2022)
    Details
    Publication Date: 2022-05-19
    Description: Providencia y Santa Catalina han sido primordiales para la comunicación y la navegación entre los diferentes territorios del Caribe y la costa colombiana. Así, a través de los siglos, la integración de actores culturales y naturales ha contribuido a la creación de un paisaje cultural marítimo. En este sentido se diluyen los límites entre la tierra y el mar, por medio de las dinámicas sociales, políticas, religiosas, militares, bélicas, económicas, comerciales y tecnológicas que se pueden observar tanto en los sitios arqueológicos como en la actualidad. El proyecto ‘Apropiación social del paisaje cultural marítimo en Providencia y Santa Catalina: caracterización del espacio náutico desde una perspectiva histórica’ pretende comprender y caracterizar las dinámicas y elementos que hacen parte del paisaje cultural marítimo de las islas a partir del análisis de diferentes fuentes de información de manera interdisciplinar (arqueología, antropología, historia, hidrografía). Sin embargo, este artículo busca enfatizar en una caracterización arqueológica no intrusiva de sitios arqueológicos que permiten comprender las dinámicas de movilidad, producción y defensa de las islas como elementos que contribuyen a la configuración del paisaje cultural marítimo.
    Description: Providencia and Santa Catalina have been essential for communication and navigation between the different territories of the Caribbean and the Colombian coast. Thus, through the centuries the integration of cultural and natural actors has contributed to the creation of a Maritime Cultural Landscape. In this sense, the boundaries between land and sea are diluted through social, political, religious, military, war, economic, commercial and technological dynamics that can be observed both in archaeological sites and nowadays. The project "Social Appropriation of the Maritime Cultural Landscape in Providencia and Santa Catalina: Characterization of the Nautical Space from a Historical Perspective" aims to understand and characterize the dynamics and elements that are part of the Maritime Cultural Landscape of the islands from the analysis of different sources of information in an interdisciplinary way (archeology, anthropology, history, hydrography). However, this article seeks to emphasize a non- intrusive archaeological characterization of archaeological sites that allow understanding the dynamics of mobility, production, and defense of the islands as elements that contribute to the configuration of the Maritime Cultural Landscape.
    Description: Published
    Description: Not Known
    Keywords: Patrimonio cultural sumergido ; Paisaje cultural marítimo. ; ASFA_2015::C::Cultures ; ASFA_2015::M::Marine archaeology ; ASFA_2015::E::Expeditions (one vessel)
    Repository Name: AquaDocs
    Type: Journal Contribution
    Format: pp.83-90
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  • 4
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    Societal importance of Antarctic negative feedbacks on climate change: blue carbon gains from sea ice, ice shelf and glacier losses (2021)
    In:  EPIC3The Science of Nature, 108(5), ISSN: 0028-1042
    Details
    Publication Date: 2022-01-03
    Description: Diminishing prospects for environmental preservation under climate change are intensifying efforts to boost capture, storage and sequestration (long-term burial) of carbon. However, as Earth’s biological carbon sinks also shrink, remediation has become a key part of the narrative for terrestrial ecosystems. In contrast, blue carbon on polar continental shelves have stronger pathways to sequestration and have increased with climate-forced marine ice losses—becoming the largest known natural negative feedback on climate change. Here we explore the size and complex dynamics of blue carbon gains with spatiotemporal changes in sea ice (60–100 MtCyear−1), ice shelves (4–40 MtCyear−1 = giant iceberg generation) and glacier retreat (〈 1 MtCyear−1). Estimates suggest that, amongst these, reduced duration of seasonal sea ice is most important. Decreasing sea ice extent drives longer (not necessarily larger biomass) smaller cell-sized phytoplankton blooms, increasing growth of many primary consumers and benthic carbon storage—where sequestration chances are maximal. However, sea ice losses also create positive feedbacks in shallow waters through increased iceberg movement and scouring of benthos. Unlike loss of sea ice, which enhances existing sinks, ice shelf losses generate brand new carbon sinks both where giant icebergs were, and in their wake. These also generate small positive feedbacks from scouring, minimised by repeat scouring at biodiversity hotspots. Blue carbon change from glacier retreat has been least well quantified, and although emerging fjords are small areas, they have high storage-sequestration conversion efficiencies, whilst blue carbon in polar waters faces many diverse and complex stressors. The identity of these are known (e.g. fishing, warming, ocean acidification, non-indigenous species and plastic pollution) but not their magnitude of impact. In order to mediate multiple stressors, research should focus on wider verification of blue carbon gains, projecting future change, and the broader environmental and economic benefits to safeguard blue carbon ecosystems through law.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 5
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    Perspective: Increasing blue carbon around Antarctica is an ecosystem service of considerable societal and economic value worth protecting (2021)
    In:  EPIC3Global Change Biology, 27(1), pp. 5-12, ISSN: 1354-1013
    Details
    Publication Date: 2022-01-03
    Description: Precautionary conservation and cooperative global governance are needed to protect Antarctic blue carbon: the world's largest increasing natural form of carbon storage with high sequestration potential. As patterns of ice loss around Antarctica become more uniform, there is an underlying increase in carbon capture-to-storage-to-sequestration on the seafloor. The amount of carbon captured per unit area is increasing and the area available to blue carbon is also increasing. Carbon sequestration could further increase under moderate (+1°C) ocean warming, contrary to decreasing global blue carbon stocks elsewhere. For example, in warmer waters, mangroves and seagrasses are in decline and benthic organisms are close to their physiological limits, so a 1°C increase in water temperature could push them above their thermal tolerance (e.g. bleaching of coral reefs). In contrast, on the basis of past change and current research, we expect that Antarctic blue carbon could increase by orders of magnitude. The Antarctic seafloor is biophysically unique and the site of carbon sequestration, the benthos, faces less anthropogenic disturbance than any other ocean continental shelf environment. This isolation imparts both vulnerability to change, and an avenue to conserve one of the world's last biodiversity refuges. In economic terms, the value of Antarctic blue carbon is estimated at between £0.65 and £1.76 billion (~2.27 billion USD) for sequestered carbon in the benthos around the continental shelf. To balance biodiversity protection against society's economic objectives, this paper builds on a proposal incentivising protection by building a ‘non-market framework’ via the 2015 Paris Agreement to the United Nations Framework Convention on Climate Change. This could be connected and coordinated through the Antarctic Treaty System to promote and motivate member states to value Antarctic blue carbon and maintain scientific integrity and conservation for the positive societal values ingrained in the Antarctic Treaty System.
    Repository Name: EPIC Alfred Wegener Institut
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  • 6
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    Decline in plankton diversity and carbon flux with reduced sea ice extent along the Western Antarctic Peninsula (2021)
    Nature Research
    Details
    Publication Date: 2022-05-27
    Description: © The Author(s), 2021. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Lin, Y., Moreno, C., Marchetti, A., Ducklow, H., Schofield, O., Delage, E., Meredith, M., Li, Z., Eveillard, D., Chaffron, S., & Cassar, N. Decline in plankton diversity and carbon flux with reduced sea ice extent along the Western Antarctic Peninsula. Nature Communications, 12(1), (2021): 4948, https://doi.org/10.1038/s41467-021-25235-w.
    Description: Since the middle of the past century, the Western Antarctic Peninsula has warmed rapidly with a significant loss of sea ice but the impacts on plankton biodiversity and carbon cycling remain an open question. Here, using a 5-year dataset of eukaryotic plankton DNA metabarcoding, we assess changes in biodiversity and net community production in this region. Our results show that sea-ice extent is a dominant factor influencing eukaryotic plankton community composition, biodiversity, and net community production. Species richness and evenness decline with an increase in sea surface temperature (SST). In regions with low SST and shallow mixed layers, the community was dominated by a diverse assemblage of diatoms and dinoflagellates. Conversely, less diverse plankton assemblages were observed in waters with higher SST and/or deep mixed layers when sea ice extent was lower. A genetic programming machine-learning model explained up to 80% of the net community production variability at the Western Antarctic Peninsula. Among the biological explanatory variables, the sea-ice environment associated plankton assemblage is the best predictor of net community production. We conclude that eukaryotic plankton diversity and carbon cycling at the Western Antarctic Peninsula are strongly linked to sea-ice conditions.
    Description: This work is supported by NSF OPP-1643534 to N.C., NSF OPP-1341479 to A.M., and NSF PLR-1440435 to H.D. and O.S. (Palmer LTER).
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 7
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    Bitácora Hidrográfica, No. 22, Junio 2020 (2022)
    Details
    Publication Date: 2022-09-30
    Description: Estudio y respeto del ambiente en tiempos de pandemia – Dirección de Hidrografía y Navegación Consolidando las bases de una nación marítima andina, amazónica, bioceánica y con presencia en la Antártida – Ingresando a la era de la impresión digital de cartas - Hacia una nueva ruta. Decenio de las ciencias oceánicas para el desarrollo sostenible - Áreas marinas protegidas su rol e importancia en la protección de la biodiversidad - Valoración del fondo marino en la 200 millas del Mar de Grau frontera inexplorada de Perú - Línea de más alta marea e importancia de su determinación y paralela - Evolución de la cartografía náutica electrónica - Tablas de mareas del papel a la era digital - Resumen de las actividades realizadas en la vigésima séptima campaña científica del Perú en la Antártida - Certificaciones valiosos soportes de calidad - IALA fecunda trayectoria - Arduino: un microprocesador inteligente. Control del mundo físico - B.A.P. Carrillo y B.A.P. Melo: Valiosos 35 años de actividades hidro-oceanográficas en el litoral peruano - Pañol de anécdotas: Los rituales del lago Titicaca.
    Description: Published
    Description: Refereed
    Keywords: Cartas náuticas digitales ; Areas marinas protegidas ; ASFA_2015::O::Oceanography ; ASFA_2015::H::Hydrography ; Fondos marinos ; Tablas de mareas
    Repository Name: AquaDocs
    Type: Book/Monograph/Conference Proceedings
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  • 8
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    País de Mares No. 9, 2020 (2022)
    Ed. Dimar | Bogotá D.C., Colombia
    Details
    Publication Date: 2022-08-17
    Description: Contenido -- Calado vs. Profundidad, actores importantes del río -- Drummond avanza con sus trabajadores y comunidades en tiempos de crisis -- La instrumentación oceanográfica en la consolidación del territorio marítimo -- Se construirán en Colombia nuevos buques para la investigación científica y la seguridad marítima -- Diálogo con la primera mujer jefe del Servicio Hidrográfico Nacional de Colombia. -- El canal interoceánico nivel Atrato-Truandó y las hidroeléctricas del Atrato pueden cambiar la suerte del país. -- Gestión de la Autoridad Marítima Colombiana ante la pandemia por la COVID-19. -- Conpes: Colombia potencia bioceánica sostenible 2030. -- Educación marítima y fluvial 2.0: el reto offshore para el Caribe colombiano -- La importancia de un pensamiento marítimo estratégico en un país bioceánico -- Agenda Dimar -- Batimetría asistida por satélite, complementos para la cartografía batimétrica en el Pacífico colombiano -- Coberturas vegetales asociadas a la franja costera del Valle del Cauca y su importancia ecológica y administrativa -- La microbiología como portal para conocer el grado de contaminación marina en la Antártica -- Dimar en Imágenes -- La navegación electrónica -- Adopción del Código de Estabilidad sin Averías (Código IS, 2008) -- ¿Qué es Pianc? Y la importancia de su fortalecimiento en Colombia -- Servicio meteorológico marino, una necesidad para las funciones de Estado Ribereño -- Las playas, más que un ordenamiento, una oportunidad -- La relevancia del ordenamiento marino-costero en el contexto de la planificación espacial marina en Colombia -- Modelo integrado de gestión de zonas costeras: eje estratégico de las actividades marítimas seguras y sostenibles en las playas turísticas de Cartagena -- Evolución legislativa referente al patrimonio cultural sumergido en Colombia -- #LéxicoDelMar
    Description: Published
    Description: Not Known
    Keywords: Investigación científica ; Puertos ; Seguridad en la navegación ; Hidrocarburos ; Río ; Buque ; Contaminación Marina ; Litorales ; Medio ambiente ; ASFA_2015::C::Contamination ; ASFA_2015::G::Geography ; ASFA_2015::P::Port installations ; ASFA_2015::S::Safety ; ASFA_2015::V::Vessels ; ASFA_2015::I::Information scientists
    Repository Name: AquaDocs
    Type: Book/Monograph/Conference Proceedings
    Format: 108pp.
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  • 9
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    País de Mares No. 7, 2019 (2022)
    Dirección General Marítima
    Details
    Publication Date: 2022-08-17
    Description: Contenido: --Comprometidos con el desarrollo marítimo del país. --Mintransporte: nuestro mayor desafía es consolidar los puertos marítimos ara dinamizar el comercio internacional. --Colombia reactiva la exploración de hidrocarburos en el mar Caribe. --Prevención de la contaminación biológica venerada por buques de tráfico marítimo internacional: un ejercicio de autoridad. --Generación de conciencia marítima y fluvial: la tarea de la educación en un país bioceánico y plurifluvial. --Desguace de buques en Colombia realidad y perspectiva. --Empoderamiento a la mujer marítima. --El conocimiento como base para la seguridad marítima, fluvial y portuaria: diseño de estabilización de playa y talud en Isla Draga, canal de acceso a la bahía de Cartagena. --Mejoramiento de la infraestructura geodésica espacial GNSS en isla Cayo Serranilla. --Repositorio Digital de Colombia: resguardando más de 40 años de historia en investigación científica marina. --El “riesgo” como actor de la seguridad integral marítima, fluvial y portuaria. --Operaciones marítimas del puerto de Cartagena. --La Isla Verde y la ensenada de Sabanilla. --Una historia y dos voces para contar los inicios de Dimar en el principal puerto del Pacífico colombiano.
    Description: Content: --Committed to the maritime developent of the country. --Ministry of Transport: Our biggest challenge is to strengthen seaport to boost international trade. --Colombia reactivates hydrocabon exploration in the Caribbean Sea. --Prevention of biological pollution generated by intrnational maritime traffic vessels: in the excecise of authority. --Generation of maritime and river consciousness: the task of education bioceanic and plurifluvial country. --Ship scrapping in Colombia reality and perspective. --Empowering maritime women. --Knowledge as a basis for integral maritime, river and port security: beach and slope stabilization design on Isla Draga, Access channel to the Bay of Cartagena. --Improvement of the GNSS geodetic spacial infraestructura in Cayo Serranilla Island. --Digital Repository of Colombia: Safeguarding more tan 40 years of history in marine scientific research. --The “risk” as an actor in maritime, river and port integral security. --Maritime operations of the Port of Cartagena. --The Isla Verde and Sabanilla Cove. --A story and two voices to tell the beginnings of Dimar in the main port of the Colombian Pacific
    Description: Published
    Description: Not Known
    Keywords: Investigación Científica ; Puerto ; Seguridad marítima ; Historia ; Hidrocarburo ; Río ; Buque ; Contaminación ; ASFA_2015::E::Education ; ASFA_2015::I::International relations ; ASFA_2015::C::Contamination ; ASFA_2015::I::Information scientists ; ASFA_2015::V::Vessels ; ASFA_2015::S::Safety ; ASFA_2015::P::Port installations
    Repository Name: AquaDocs
    Type: Book/Monograph/Conference Proceedings
    Format: 89pp.
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  • 10
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    País de Mares No. 5, 2018 (2022)
    Editorial Dimar | Bogotá D.C., Colombia
    Details
    Publication Date: 2022-08-18
    Description: Contenido: -- Dirección General marítima: Colombia como actor marítimo influyente en la región -- Con transparencia, Dimar le responde a la ciudadanía -- Nueva sede de Dimar regional Caribe -- SIG Dimar, un espacio para todos -- Escuela Naval de Suboficiales ARC “Barranquilla”: la escuela naval tecnológica para el ‘País de Mares’ -- Nuevas tecnologías en las actividades de registro del fondo marino en el Caribe Colombiano -- Fortalecimiento jurídico de la autoridad marítima colombiana -- La pesca y los fenómenos meteomarinos, de la mano con la investigación marina -- Seguridad integral marítima y fluvial, aporte al desarrollo económico del sector marítimo de Barranquilla -- Cccp optimiza sus recursos tecnológicos e informativos -- La batimetría y su influencia en el conocimiento del relieve submarino del mar Caribe colombiano -- Estrategia y proyectos de investigación científica en la Dirección General Marítima -- Análisis de las capacidades de Dimar en el monitoreo meteorológico y oceanográfico – RedMpomm, contrastado con el estado actual de las alianzas GRASP e IOCaribe-GOOS -- La autoridad marítima colombiana afronta los retos del cambio climático evaluando sus aguas marinas -- El rol de la guía de lineamientos operacionales en el Puerto de Barranquilla -- Desarrollo fluvial de Colombia: compromiso de la Dirección General Marítima -- El beneficio estratégico nacional del sistema de control de tráfico marítimo -- El ordenamiento de playas como catalizador de la seguridad integral marítima -- Años de ciencia al servicio del Pacífico colombiano
    Description: Published
    Description: Not Known
    Keywords: Investigación científica ; Puerto ; Seguridad marítima ; Medio ambiente ; Historia ; Formación ; ASFA_2015::E::Education ; ASFA_2015::I::International relations ; ASFA_2015::E::Equipment ; ASFA_2015::I::Information scientists ; ASFA_2015::V::Vessels ; ASFA_2015::S::Safety ; ASFA_2015::P::Port installations ; ASFA_2015::C::Contamination
    Repository Name: AquaDocs
    Type: Book/Monograph/Conference Proceedings
    Format: 104pp.
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