Author: Publisher:
ISBN:
Category : Marine ecology
Languages : en
Pages : 480
Book Description
Analyse de l'écosystème des "upwellings"
Author: Analyse de l'écosystème des upwellings
Author: Coastal Upwelling Its Sediment Record
Author: Jörn ThiedePublisher: Springer
ISBN:
Category : Nature
Languages : en
Pages : 640
Book Description
NATO Advanced Research Institutes are designed to explore unre solved problems. By focusing complementary expertise from various disciplines onto one unifying theme, they approach old problems in new ways. In line with this goal of the NATO Science Committee, and with substantial support from the u.s. Office of Naval Research and the Seabed Assessment Program of the u.s. National Science Founda tion, such a Research Institute on the theme of Coastal Qpw llinq and Its Sediment Record was held September 1-4, 1981, in Vilamoura, Portuqal. The theme implies a modification of uniformitarian thinking in earth science. Expectations were directed not so much towards find ing the key to the past as towards explorinq the limits of interpret inq the past based on present upwelling oceanography. Coastal up wellinq and its imprint on sediments are particularly well-suited for such a scientific inquiry. The oceanic processes and conditions characteristic of upwelling are well understood and are a well packaqed representation of ocean science that are familiar to qeolo gists, just as the maqnitude of bioproduction and sedimentation in upwellinq reqimes --among other bioloqical and geoloqical processes- have made oceanographers realize that the bottom has a feedback role for their models.
Plankton Ecology of the Southwestern Atlantic
Author: Mónica S. HoffmeyerPublisher: Springer
ISBN: 3319778692
Category : Science
Languages : en
Pages : 592
Book Description
This book integrates a variety of issues such as regional settings of productivity and nutrient cycling; plankton of coastal and shelf systems; plankton, climate change and human-induced changes; harmful algae and their impacts; and gelatinous zooplankton. This book explores the intriguing marine plankton communities of the SWA region of South America encompassing low to high latitude environments, framed by a complex hydrographic background and global climate change. This vast and iconic region has been largely under-recognized and under-studied. However, in recent years a strong interest has emerged along with the acknowledgment of its high biological productivity. The book concludes by discussing conservation in the region, highlighting regional biodiversity hotspots where the challenges of climate change, habitat loss, and other threats to biodiversity may be particularly acute. Plankton Ecology of the Southwestern Atlantic is a timely synthesis of the field, setting a new baseline for future research. It will be important reading for both researchers and graduate students, and will also be of interest and use to a professional audience of oceanographers, conservation biologists, stake holders and educated science enthusiasts
Conférence Sur Les Modèles Des Mécanismes de Transport Dans Les Mers Et Les Lacs
Author: Influence Des Processus Physiques À Mésoéchelle Sur L'écosystème Planctonique
Author: Vincent RossiPublisher:
ISBN:
Category :
Languages : en
Pages : 277
Book Description
The objectives were numerous but centered on a scientific overarching question: the influence of mesoscale physical processes on planktonic ecosystems in coastal upwellings. The use of several and complementary tools was necessary to assess the various mechanisms occurring at these scales. First, the variability of the physical and biogeochemical properties of the Iberian Peninsula Upwelling System was studied using in-situ data from the MOUTON 2007 survey. The coastal domain was divided into different biogeochemical provinces: high nutrient concentrations are found in the northern part due to upwelled waters of subpolar origin whereas the southern area was characterized by moderate nutrient concentrations (waters of subtropical origin). The intense cross-shore gradient revealed that the biological activity is associated with the successive upwelling pulses. Data from a filament allowed us to assess its impact in terms of cross-shore exchanges of biological material. Then, a secondary upwelling front located at the shelf break was observed in these data. We built a simplified 2D numerical model to explain it by the eastward advection from upwelling currents of deep water columns onto the shelf. It creates a negative anomaly of Potential Vorticity (PV) which generates the secondary front. A simulation revealed a filamentation process that was further investigated numerically. The interaction between the alongshore upwelling current and a promontory creates anomalies of PV in the lower layer that generates the development of a filament trapped in the vicinity of the promontory. Finally, we used satellite data associated with a lagrangian tool (Finite-Size Lyapunov Exponent) to study the horizontal mixing in relation to the biological activity over the four eastern boundary upwelling zones. We showed a negative relationship between horizontal surface mixing and chlorophyll content, which seems related to a diminution of vertical velocities of the coastal upwelling, as well as a lateral loss of nutrient due to moving eddies. Horizontal mixing induced by eddies thus has an inhibiting effect on the phytoplankton in coastal upwellings, whereas a positive effect stands for the open ocean. Using diverse and complementary tools allowed us to improve our knowledge of the large influence of physical processes on marine ecosystems.
Bibliographic Guide to Conference Publications
Author: New York Public Library. Research LibrariesPublisher:
ISBN:
Category : Congresses and conventions
Languages : en
Pages : 584
Book Description
Vols. for 1975- include publications cataloged by the Research Libraries of the New York Public Library with additional entries from the Library of Congress MARC tapes.
Manuscript Report Series - Marine Sciences Directorate
Author: National Union Catalog
Author: Publisher:
ISBN:
Category : Union catalogs
Languages : en
Pages : 616
Book Description
Includes entries for maps and atlases.
Author: