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  • 1
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    País de Mares No. 3, 2017 (2022)
    Editorial Dimar | Bogotá D.C., Colombia
    Details
    Publication Date: 2022-08-18
    Description: Contenido: -- Colombia extiende la cobertura en servicios de seguridad marítima. -- Seaflower, Plan Nacional de Expediciones Científicas. -- Dimar aporta a la seguridad de las maniobras de descargue de material para obras del aeropuerto “El Embrujo”. -- Un “Guardián” en los cielos de nuestro mar. -- Nuevas alianzas: Dimar, comprometida con la seguridad marítima internacional. -- Sistemas de gestión de calidad aplicados a la protección marítima en Colombia. -- Oficina de asuntos portuarios del puerto de Barranquilla. -- Nueva plataforma de investigación para nuestros mares: ARC “Roncador”. -- “Vamos a hacer muy pronto la mejor autopista de Colombia”. -- En la Escuela Naval de Suboficiales ARC “Barranquilla”. Nuevos programas de seguridad marítima y código PBIP. -- Colombia, un país de espaldas a la planeación del territorio marítimo. -- Puerto Drummond. Trascendiendo fronteras con calidad, innovación y compromiso. -- Magdalena global: del Río al mundo. -- Un día Pacífico en la protección del medio ambiente marino. -- Impacto de la zonificación y ordenamiento de playas turísticas para la consolidación de la seguridad integral marítima. -- ARC “Ciénaga de Mallorquín”: 19 años de historia y excelente labor. -- Puerto de Barranquilla: 80 Años impulsando desarrollo. -- Colombia, incluida en la “Lista Blanca” de la OMI. -- El transporte marítimo Colombia - Ecuador, un compromiso de integración fronteriza para el desarrollo de una región vulnerable. -- Colombia entró al mapa internacional del gas natural licuado. -- Japón sede del curso y entrenamiento internacional MOU y OMI.
    Description: Published
    Description: Not Known
    Keywords: Investigación científica ; Seguridad marítima ; Puerto ; Medio ambiente ; Historia ; Buque de investigación ; Internacional ; 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
    Repository Name: AquaDocs
    Type: Book/Monograph/Conference Proceedings
    Format: 87pp.
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  • 2
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    Tropical tree growth driven by dry-season climate variability (2022)
    In:  Nature Geoscience
    Details
    Publication Date: 2022-05-04
    Description: Interannual variability in the global land carbon sink is strongly related to variations in tropical temperature and rainfall. This association suggests an important role for moisture-driven fluctuations in tropical vegetation productivity, but empirical evidence to quantify the responsible ecological processes is missing. Such evidence can be obtained from tree-ring data that quantify variability in a major vegetation productivity component: woody biomass growth. Here we compile a pantropical tree-ring network to show that annual woody biomass growth increases primarily with dry-season precipitation and decreases with dry-season maximum temperature. The strength of these dry-season climate responses varies among sites, as reflected in four robust and distinct climate response groups of tropical tree growth derived from clustering. Using cluster and regression analyses, we find that dry-season climate responses are amplified in regions that are drier, hotter and more climatically variable. These amplification patterns suggest that projected global warming will probably aggravate drought-induced declines in annual tropical vegetation productivity. Our study reveals a previously underappreciated role of dry-season climate variability in driving the dynamics of tropical vegetation productivity and consequently in influencing the land carbon sink.
    Type: info:eu-repo/semantics/article
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  • 3
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    Characterization of the Crystallographic Preferred Orientation Relationships of the Magnetite-Hematite-Goethite Phase Transformation during Martitization (2022)
    In:  Minerals
    Details
    Publication Date: 2022-05-25
    Description: The most frequent crystallographic preferred orientations developed during the progressive phase transformation of magnetite-hematite-goethite are described and analyzed in two natural samples of banded iron formations from Carajás Mineral Province. Microtextures of martitized grains containing the three phases and the microplaty matrix were analyzed in a scanning electron microscope equipped with a detector for electron backscatter diffraction. For identifying the correlation between magnetite, hematite and goethite lattice and topotaxity during transformation, multiple orientation relationships between the three phases were tested and verified using three-dimensional misorientation analysis. The results show that basal planes of goethite coincide with basal planes of hematite, which coincide with octahedral planes of magnetite. This indicates that transformation between the three minerals happens topotactically, and the oxygen lattice framework is preserved in all members of the reaction as a form of crystallographic memory. As a result of progressive and cyclical changes in oxidation/reduction conditions, an assemblage of high-order orientation relationships is observed and assigned to a complex process of transformation twinning in-between phase transformation of magnetite, hematite and goethite. In the N4WS iron ore deposit, iron oxides/hydroxides from martitized grains work as susceptible markers of environmental changes still in solid state during the diagenetic process.
    Type: info:eu-repo/semantics/article
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  • 4
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    Climate-induced hysteresis of the tropical forest in a fire-enabled Earth system model (2021)
    In:  European Physical Journal - Special Topics
    Details
    Publication Date: 2022-03-21
    Description: Tropical rainforests are recognized as one of the terrestrialtipping elements which could have profound impacts on the global cli-mate, once their vegetation has transitioned into savanna or grasslandstates. While several studies investigated the savannization of, e.g., theAmazon rainforest, few studies considered the influence of fire. Fire isexpected to potentially shift the savanna-forest boundary and henceimpact the dynamical equilibrium between these two possible vegeta-tion states under changing climate. To investigate the climate-inducedhysteresis in pan-tropical forests and the impact of fire under future cli-mate conditions, we employed the Earth system model CM2Mc, whichis biophysically coupled to the fire-enabled state-of-the-art dynamicglobal vegetation model LPJmL. We conducted several simulation ex-periments where atmospheric CO2concentrations increased (impactphase) and decreased from the new state (recovery phase), each withand without enabling wildfires. We find a hysteresis of the biomassand vegetation cover in tropical forest systems, with a strong regionalheterogeneity. After biomass loss along increasing atmospheric CO2concentrations and accompanied mean surface temperature increase ofabout 4°C (impact phase), the system does not recover completely intoits original state on its return path, even though atmospheric CO2concentrations return to their original state. While not detecting large-scale tipping points, our results show a climate-induced hysteresis intropical forest and lagged responses in forest recovery after the climatehas returned to its original state. Wildfires slightly widen the climate-induced hysteresis in tropical forests and lead to a lagged response inforest recovery by ca. 30 years.
    Language: English
    Type: info:eu-repo/semantics/article
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  • 5
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    Glossary on atmospheric electricity and its effects on biology (2021)
    In:  International Journal of Biometeorology
    Details
    Publication Date: 2022-03-21
    Description: There is an increasing interest to study the interactions between atmospheric electrical parameters and living organisms at multiple scales. So far, relatively few studies have been published that focus on possible biological effects of atmospheric electric and magnetic fields. To foster future work in this area of multidisciplinary research, here we present a glossary of relevant terms. Its main purpose is to facilitate the process of learning and communication among the different scientific disciplines working on this topic. While some definitions come from existing sources, other concepts have been re-defined to better reflect the existing and emerging scientific needs of this multidisciplinary and transdisciplinary area of research.
    Type: info:eu-repo/semantics/article
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  • 6
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    When do Farmers Burn Pasture in Brazil: A Model-Based Approach to Determine Burning Date (2021)
    In:  Rangeland Ecology & Management
    Details
    Publication Date: 2022-03-21
    Description: Fire is widely used by farmers in Brazil during the winter, or the dry season, to remove accumulated dead pasture biomass. These practices have substantial impacts on vegetation, soil nutrients and carbon emissions. However, they are rarely represented within process-based fire models embedded within Dynamic Global Vegetation Models (DGVM). We developed an algorithm named Chalumeau to estimate the expected burning dates from daily precipitation or temperature depending on the seasonality type. By coupling with a fire module from a DGVM, Chalumeau enables the ignition of fire as an essential part of modelling fire practices. The burning dates are evaluated by comparing against observed fire dates on pasture. From these estimated dates, we extract the timing strategies of ranchers, which vary regionally within Brazil. This study confirms that climatic conditions are the main trigger for farmers decisions to set fire and shows the different burning strategies across Brazil.
    Type: info:eu-repo/semantics/article
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  • 7
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    Amazon Hydrology From Space: Scientific Advances and Future Challenges (2021)
    In:  Reviews of Geophysics
    Details
    Publication Date: 2022-03-31
    Description: As the largest river basin on Earth, the Amazon is of major importance to the world's climate and water resources. Over the past decades, advances in satellite-based remote sensing (RS) have brought our understanding of its terrestrial water cycle and the associated hydrological processes to a new era. Here, we review major studies and the various techniques using satellite RS in the Amazon. We show how RS played a major role in supporting new research and key findings regarding the Amazon water cycle, and how the region became a laboratory for groundbreaking investigations of new satellite retrievals and analyses. At the basin-scale, the understanding of several hydrological processes was only possible with the advent of RS observations, such as the characterization of "rainfall hotspots" in the Andes-Amazon transition, evapotranspiration rates, and variations of surface waters and groundwater storage. These results strongly contribute to the recent advances of hydrological models and to our new understanding of the Amazon water budget and aquatic environments. In the context of upcoming hydrology-oriented satellite missions, which will offer the opportunity for new synergies and new observations with finer space-time resolution, this review aims to guide future research agenda toward integrated monitoring and understanding of the Amazon water from space. Integrated multidisciplinary studies, fostered by international collaborations, set up future directions to tackle the great challenges the Amazon is currently facing, from climate change to increased anthropogenic pressure.
    Type: info:eu-repo/semantics/article
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