The Record of Global Change in Circum-Antarctic Marine Sediments PDF Download
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Author: P. F. Barker Publisher: ISBN: Category : Languages : en Pages : 7
Book Description
Sediment drilling, using rigs located on sea ice inshore, and Ocean Drilling Program facilities farther offshore, have described the stepwise cooling of Antarctica through the Cenozoic, setting the scene for more detailed studies of short-period, recent change. Such studies will not be easy. The virtual absence of carbonate sediments and the strength of bottom currents in some regions are fundamental limitations. Nevertheless, Antarctic ocean sediments contain a record of global change which complements the record of the ice sheet, and extends it back in time. Pelagic and hemipelagic sediments of the ocean basins record changes in primary productivity, dissolution, sea ice extent and the strength of deep ocean circulation, and in the volume of the main circum-Antarctic water masses. Prograded sediments of the Antarctic continental shelf and slope contain a record of glacial/interglacial changes in ice sheet volume. Modern piston-coring techniques are capable of revealing changes over the last glacial cycle in some detail, in suitably expanded sections. At lower sediment accumulation rates, a less detailed but longer record can be obtained. It can already be shown that, at and around glacial maximum, (a) grounded ice sheets extended to the Antarctic continental shelf edge, (b) the marginal sea ice zone lay up to 5 deg farther north, and (c) Weddell Sea Bottom Water flow was far slower than at present.
Author: P. F. Barker Publisher: ISBN: Category : Languages : en Pages : 7
Book Description
Sediment drilling, using rigs located on sea ice inshore, and Ocean Drilling Program facilities farther offshore, have described the stepwise cooling of Antarctica through the Cenozoic, setting the scene for more detailed studies of short-period, recent change. Such studies will not be easy. The virtual absence of carbonate sediments and the strength of bottom currents in some regions are fundamental limitations. Nevertheless, Antarctic ocean sediments contain a record of global change which complements the record of the ice sheet, and extends it back in time. Pelagic and hemipelagic sediments of the ocean basins record changes in primary productivity, dissolution, sea ice extent and the strength of deep ocean circulation, and in the volume of the main circum-Antarctic water masses. Prograded sediments of the Antarctic continental shelf and slope contain a record of glacial/interglacial changes in ice sheet volume. Modern piston-coring techniques are capable of revealing changes over the last glacial cycle in some detail, in suitably expanded sections. At lower sediment accumulation rates, a less detailed but longer record can be obtained. It can already be shown that, at and around glacial maximum, (a) grounded ice sheets extended to the Antarctic continental shelf edge, (b) the marginal sea ice zone lay up to 5 deg farther north, and (c) Weddell Sea Bottom Water flow was far slower than at present.
Author: Neville F. Exon Publisher: American Geophysical Union ISBN: Category : Nature Languages : en Pages : 384
Book Description
"With the fragmentation of Gondwana, the southern continents other than Antarctica drifted northward and the global climate changed. One of the two key separation points, Tasmania-Antarctica, the "Tasmanian Gateway," is the subject of this volume. What was the tectonic history of Tasmanian Gateway opening, and how did gateway development impact sediments, ocean circulation and climate? The Cenozoic Southern Ocean: Tectonics, Sedimentation, and Climate Change Between Australia and Antarctica responds to such questions withnew research and interpretations on three geological phases: the rifts before the gateway opened, the deepening gateway, and changes in this part of the Southern Ocean as Australia moved northward from Antarctica."--BOOK JACKET.
Author: Neloy Khare Publisher: Springer Nature ISBN: 3030870782 Category : Science Languages : en Pages : 373
Book Description
The present book covers diversified contributions addressing the impact of climate change on the Antarctic environment. It covers the reconstruction of environmental changes using different proxies. The chapters focus on the glacial history, glacial geomorphology, sedimentology, and geochemistry of Antarctic region. Furthermore, the Cenozoic evolution of the Antarctic ice sheet is discussed along with a Scientometrics analysis of climate change research. The book serves as a useful reference for researchers who are fascinated by the polar region and environmental research.
Author: Gerold Wefer Publisher: Springer Science & Business Media ISBN: 3642189172 Category : Science Languages : en Pages : 742
Book Description
The South Atlantic plays a critical role in the couplingofoceanic processes between the Antarctic and the lower latitudes. The Antarctic Ocean, along with the adjacent southern seas, is of substantial importance for global climate and for the distributionofwater masses because itprovides large regions ofthe world ocean with intermediate and bottom waters. In contrast to the North Atlantic, the Southern Ocean acts more as an "information distributor", as opposed to an amplifier. Just as the North Atlantic is influencedby the South Atlantic through the contributionofwarm surface water,the incomingsupply ofNADW - in the area of the Southern Ocean as Circumantarctic Deep Water - influences the oceanography ofthe Antarctic. The competing influences from the northern and southern oceans on the current and mass budget systems can be best studied in the South Atlantic. Not only do changes in the current systems in the eastern Atlantic high-production regions affect the energy budget, they also influence the nutrient inventories, and therefore impact the entire productivity ofthe ocean. In addition, the broad region of the polar front is a critical area with respect to productivity-related circulation since it is the source of Antarctic Intermediate Water. Although theAntarctic Intermediate Watertoday liesdeeper than the water that rises in the upwelling regions, it is the long-term source ofnutrients that are ultimately responsible for the supply oforganic matter to the sea floor and to sediments.
Author: D. J. Drewry Publisher: Clarendon Press ISBN: Category : Nature Languages : en Pages : 154
Book Description
Three decades of research have demonstrated the intimate interaction between the Antarctic and the major environmental systems of our world. Antarctica represents a major heat sink that is of fundamental importance in driving the global atmospheric regime. This book presents authoritative essays on the ramifications of observed environmental changes occurring in this vital region. Topics include the atmosphere; the climate record from ice cores and ocean sediments; the ice sheet and its relevance to sea level, oceans, and sea ice; rock weathering, soils and colonization; terrestrial plants and animals; marine primary production and biogeochemical cycles; krill and fish stocks; seabirds, seals, and whales. Researchers in the Earth, life, atmospheric, and ocean sciences will find this volume of immense value, as will all Antarctic specialists and environmental scientists.
Author: P. F. Barker
Author: P. F. Barker
Author: 
Author: Neville F. Exon
Author: J. B. Anderson
Author: Günter Weller
Author: 
Author: P.F. Barker
Author: Neloy Khare
Author: Gerold Wefer
Author: D. J. Drewry