Author: Esteban BoltovskoyPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Planktonic Foraminifera as Indicators of Different Water Masses in the South Atlantic
Author: Esteban BoltovskoyUse 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.
Foraminifera
Author: J.R. HaynesPublisher: Springer
ISBN: 134905397X
Category : Science
Languages : en
Pages : 475
Book Description
Planktonic Foraminifers as Tracers of Ocean-climate History
Author: Gerard Johannes Augustinus BrummerPublisher:
ISBN:
Category : Climatic changes
Languages : en
Pages : 356
Book Description
Benthic Foraminifera - Indicators of Glacial and Interglacial Climate in the South Atlantic Ocean
Author: A Symposium of Recent South Florida Foraminifera
Author: James I. JonesPublisher:
ISBN:
Category : Foraminifera
Languages : en
Pages : 268
Book Description
Planktonic Foraminifera and Upper Water Column Variability in the South Atlantic
Author: Peter Graham MortynRocas Alijos
Author: Robert W. SchmiederPublisher: Springer Science & Business Media
ISBN: 9401729174
Category : Science
Languages : en
Pages : 501
Book Description
Rocas Alijos lies 180 nautical miles west of Baja California. It comprises several exposed rocks that surmount a large oceanic volcano rising from the ocean floor well off the continental shelf. It is located at the transition zone between two major biologic provinces, at a latitude where the Pacific Current turns westward to form the north Pacific trans-oceanic current. In spite of its obvious importance for biogeographical studies, the remoteness of Rocas Alijos and its small size thwarted any major scientific work until very recently, and the topography, biota, and oceanographic conditions of the site remained largely unknown. During 1990, and again in 1993, Cordell Expeditions, a nonprofit research organization based in Walnut Creek, California, undertook expeditions to describe the site. A scientific team of 30 was onsite 31 October-7 November 1990, and a scientific team of 12 was onsite 10-15 February 1993. Since most of the Rocas Alijos site is subtidal, much of the examination and specimen collection was done by scuba, although several remote sampling techniques were also used. The exposed rocks were sampled by climbers, and megafauna were observed from shipboard.
Recent Foraminifera
Author: E. BoltovskoyPublisher: Springer Science & Business Media
ISBN: 9401728607
Category : Science
Languages : en
Pages : 520
Book Description
Planktic Foraminifera as Indicators of Ocean Environments in the Northeast Atlantic
Author: Janna Jantje OttensPublisher:
ISBN: 9789090049663
Category :
Languages : en
Pages : 189
Book Description