840 research outputs found
Seasonal and Inter-Annual Variability of the Phytoplankton Dynamics in the Black Sea Inner Basin
No full textWe explore the patterns of Black Sea phytoplankton growth as driven by the thermohaline structure and circulation system and the freshwater nutrient loads. Seasonal and inter-annual variability of the phytoplankton blooms is examined using hydrodynamic simulations that resolve mesoscale eddies and online coupled bio-geochemical model. This study suggests that the bloom seasonality is homogeneous across geographic locations of the Black Sea inner basin, with the strongest bloom occurring in winter (February–March), followed by weaker bloom in spring (April–May), summer deep biomass maximum (DBM) (June–September) and a final bloom in autumn (October–November). The winter phytoplankton bloom relies on vertical mixing of nitrate from the intermediate layers, where nitrate is abundant. The winter bloom is highly dependent on the strength of the cold intermediate layers (CIL), while spring/summer blooms take advantage of the CIL weakness. The maximum phytoplankton transport across the North Western Shelf (NWS) break occurs in September, prior to the basin interior autumn bloom. Bloom initiation in early autumn is associated with the spreading of NWS waters, which in turn is caused by an increase in mesoscale eddy activity in late summer months. In summary, the intrusion of low salinity and nitrate-rich water into the basin interior triggers erosion of the thermocline, resulting in vertical nitrate uplifting. The seasonal phytoplankton succession is strongly influenced by the recent CIL disintegration and amplification of the Black Sea circulation, which may alter the natural Black Sea nitrate dynamics, with subsequent effects on phytoplankton and in turn on all marine life
Scenario simulations of the changing Black Sea ecosystem (SIMSEA)
No full text<p>The regional Black Sea ecosystem model (BSEM) has been applied for the first time for biogeochemical simulations of the Black Sea ecosystem (Oguz, T., H. W. Ducklow, J. E. Purcell, and P. Malanotte-Rizzoli (2001), Modeling the response of topdown control exerted by gelatinous carnivores on the Black Sea pelagic food web. J. Geophys. Res., 106, 4543–4564). The BSEM model is able to describe the Black Sea specific features as demonstrated by the analysis presented herein. One of the key modification of the existing models is the introduction of two new components - the carnivore predators <em>Mnemiopsis</em> and <em>Noctiluca shunt.</em> Originally they began to exist in the lower trophic Black sea food web since the 80s. They feed on zooplankton and are responsible for the reduction of zooplankton standing stock that represents an ecological concern. Detailed description of the BSEM can be found in Miladinova S., A. Stips, E. Garcia-Gorriz, D. Macias Moy (2016c), Modelling Toolbox 2: The Black Sea ecosystem model, EUR 28372 EN, doi:10.2788/677808.</p>
<p>The model is coupled to the General Estuarine Transport Model (GETM). It is forced with fluxes, obtained from realistic meteorological conditions and tuned for the Black Sea ecosystem in particular. The main advantage of the GETM-BSEM model set-up for the Black Sea is the possibility to study: (i) the long-term evolution of the Black Sea ecosystem; (ii) the effect of nutrient load and regional weather on the biogeochemical structure.</p>
<p>Data sets consists of monthly mean values of total phytoplankton (large + small) and nitrate concentrations on a horizontal grid of 423x172 data points (2 longitude minutes x 2 latitude minutes) and 70 vertical levels. Simulations are performed for the period from 1960 to 2014 (55 years). The 3D monthly mean vertical coordinate (m), phytoplankton (mmol N/m**3) and nitrate (mmol N/m**3) are stored in NetCDF format.</p>
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Modelling the carbonate system to adequately quantify ocean acidification
No full textGiven specific CO2 emission scenarios, predictions of future ocean carbonate chemistry are relatively certain at the global scale. However future regional ocean acidification and ocean carbonate chemistry are less well understood. A major challenge is assessing the risk of ocean acidification on marine food webs, ecosystems and ocean biogeochemistry.
Due to a range of natural physical and biological processes, riverine inputs, boundary conditions and runoff, the natural variability of dissolved CO2 in sea water is relatively high in regional seas. Some species, calcifying or not, have the capacity to adapt to such conditions, others do not. Establishing the biological impacts of ocean acidification is difficult due to a range of physiological and ecological trade-offs. Including the carbonate system in such complicated regions is a challenge, and significant development will be required to adequately model this in regional seas
Book Review: Adolf Hitler. Legende, mythe, werkelijkheid
No full textBook Title: Adolf Hitler. Legende, mythe, werkelijkheidBook Author: Werner MaserUitgeverij De Arbeiderspers, Amsterdam, 1973, pp. 531. Met aantekeninge [pp. 429 - 506] en bibliografie [pp. 507 - 531]
Deviation without Contradiction in Adolf Reinach’s Ontology
No full textIs it possible to affirm the existence of eidetic a priori laws, if these laws can be contradicted by positive law propositions? How is it possible a deviation from a priori juridical propositions? These are the two questions to which the present paper “Deviation without contradiction in Adolf Reinach’s ontology” is devoted. The aim of the paper is to analyse the relations between a priori juridical propositions and propositions of positive law as investigated by Adolf Reinach. The Author presents and illustrates Adolf Reinach’s conception of conditioned a priori connections
Turbulence and Zooplankton Production: Insight from PROVESS.
No full textAbstract not availableJRC.H - Institute for environment and sustainability (Ispra
Adolf Heyduk's apartment in Písek
No full textThis bachelor´s thesis will deal with the preserved burgher apartment of Czech poet Adolf Heyduk in Písek and his collection of paintings from the late 19th and early 20th century. The thesis will include a brief introduction of the personality of the Czech poet Adolf Heyduk. It will also deal with the history of the house in which the apartment is located. This will be followed by a description of the house designed by the architect Jan Koula, whom the author, together with the builder of the house, Karel Novák, will also briefly introduce. The next chapter will focus on the apartement itself, its internal layout and furnishings. The apartment has been preserved without any major modifications in almost its original form, of Art Nouveau furniture, textiles and, last but not least, many art objects and paintings by very important authors. It is a valuable collection of Czech art paintings from the late 19th and early 20th century that will be the central theme of this thesis. Finally, the author will outline the history of the establishment of the current Adolf Heyduk Memorial and and its recent reconstruction
Dissipation Measurement: Theory
No full textThe dissipation rate of turbulent kinetic energy is a key parameter to quantify the level of turbulence and the resulting mixing processes in natural waters. Based on viscous dissipation rate measurements, vertical diffusion coefficients and flux rates as well as friction velocities can be determined.This chapter describes the theory of the dissipation measurements.JRC.H.3 - Global environement monitorin
Adolf Hoffmeister: the reader and the creator
No full textThe aim of this thesis is to present the life and work of Adolf Hoffmeister and show its relationship to the book from the perspective of the reader and author. The thesis is divided into three main parts. The first part relating to significant events in the life of Adolf Hoffmeister is followed by an overview of his creative and literary works related to the book and book culture. The substantial point of this work is to discribe and analyze Hoffmeister's library and his reading interests
Deviation without contradiction in Adolf Reinach's Ontology
No full textThis paper examines Adolf Reinach’s views about negative states of affairs. The author briefly presents the history of the issue from the Middle Ages to the 20th century. The views of Reinach and Roman Ingarden are compared. A special focus is ascribed to the problem of omissions in the legal sense. According to the author, a proper solution to the problem of negative states of affairs locates negation at the level of language, not in reality
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