Author: Niraj KumarPublisher:
ISBN:
Category :
Languages : en
Pages : 634
Book Description
Trace Metals and Natural Radionuclides as Tracers of Ocean Productivity
Author: Niraj KumarTrace Metals and Natural Radionuclides as Tracers of Ocean Productivity
Author: Nīraja Kumāra CaturvedīPublisher:
ISBN:
Category :
Languages : en
Pages : 634
Book Description
Natural and artificial radionuclides as tracers of ocean processes
Author: Jixin QiaoPublisher: Frontiers Media SA
ISBN: 2832521770
Category : Science
Languages : en
Pages : 160
Book Description
Ocean Biogeochemistry
Author: Michael J.R. FashamPublisher: Springer Science & Business Media
ISBN: 3642558445
Category : Science
Languages : en
Pages : 324
Book Description
Oceans account for 50% of the anthropogenic CO2 released into the atmosphere. During the past 15 years an international programme, the Joint Global Ocean Flux Study (JGOFS), has been studying the ocean carbon cycle to quantify and model the biological and physical processes whereby CO2 is pumped from the ocean's surface to the depths of the ocean, where it can remain for hundreds of years. This project is one of the largest multi-disciplinary studies of the oceans ever carried out and this book synthesises the results. It covers all aspects of the topic ranging from air-sea exchange with CO2, the role of physical mixing, the uptake of CO2 by marine algae, the fluxes of carbon and nitrogen through the marine food chain to the subsequent export of carbon to the depths of the ocean. Special emphasis is laid on predicting future climatic change.
Use of Proxies in Paleoceanography
Author: Gerhard FischerPublisher: Springer Science & Business Media
ISBN: 3642586465
Category : Science
Languages : en
Pages : 768
Book Description
Paleoceanographic proxies provide infonnation for reconstructions of the past, including climate changes, global and regional oceanography, and the cycles of biochemical components in the ocean. These prox ies are measurable descriptors for desired but unobservable environmental variables such as tempera ture, salinity, primary productivity, nutrient content, or surface-water carbon dioxide concentrations. The proxies are employed in a manner analogous to oceanographic methods. The water masses are first characterized according to their specific physical and chemical properties, and then related to particular assemblages of certain organisms or to particular element or isotope distributions. We have a long-standing series of proven proxies available. Marine microfossil assemblages, for instance, are employed to reconstruct surface-water temperatures. The calcareous shells of planktonic and benthic microorgan isms contain a wealth of paleoceanographic information in their isotopic and elemental compositions. Stable oxygen isotope measurements are used to detennine ice volume, and MglCa ratios are related to water temperatures, to cite a few examples. Organic material may also provide valuable infonnation, e. g. , about past productivity conditions. Studying the stable carbon isotope composition of bulk organic matter or individual marine organic components may provide a measure of past surface-water CO 2 conditions within the bounds of certain assumptions. Within the scope of paleoceanographic investigations, the existing proxies are continuously evolving and improving, while new proxies are being studied and developed. The methodology is improved by analysis of samples from the water column and surface sediments, and through laboratory experiments.
Radionuclides in the Study of Marine Processes
Author: P.J. KershawPublisher: Springer Science & Business Media
ISBN: 9401136866
Category : Science
Languages : en
Pages : 402
Book Description
The Norwich Symposium, 'Radionuclides in the Study of Marine Proces ses', is a sequel to the very successful conference held at Cherbourg, France in June 1987. The international character of the meeting has been maintained with thirty-eight contributions, from seventeen countries, being accepted for oral presentation. For many years, the radioactive properties of the naturally occurring radionuclides have been used to determine their distributions in the marine environment and, more generally, to gain an understanding of the dynamic processes which control their behaviour in attaining these distributions. More recently the inputs from human activities of both natural and artificial (i.e. man-made) radionuclides have provided additional opportunities for the study of marine processes on local, regional and global scales. Because the sources of artificial radionuclides are often reasonably well defined in space and time, and because a wider range of elements is represented, new viewpoints for the study of processes have become available. Although it is outside the scope of this Symposium, it must be acknowledged that the radiological protection requirements for radioactive waste disposal prac tices to be based on a sound scientific understanding of radionuclide behaviour in the sea have also provided a very strong impetus for the studies.
Mobilisation of Sedimentary Trace Metals Following Improved Oxygen Conditions
Author: Publisher: Nordic Council of Ministers
ISBN: 9789289303910
Category : Chemical oceanography
Languages : en
Pages : 72
Book Description
Transfer Factors of Trace Elements and Radionuclides in the Marine Marine Environment of India
Author: M. V. M. DesaiPublisher:
ISBN:
Category : Marine pollution
Languages : en
Pages : 114
Book Description
Trace Metals and Marine Production Processes
Author: Radionuclides: A Tool for Oceanography
Author: P. GeugueniatPublisher: Routledge
ISBN: 1482286483
Category : Architecture
Languages : en
Pages : 484
Book Description
Proceedings of an International Symposium jointly organized by the 'Societe Francaise pour L'Energie Nucleaire' SFEN and 'L'Institut National des Techs. de la Mer' INTECHMER - CNAM at Cherbourg, France, 1-5 June 1987.