By Ruediger Stein (Eds.)
Even though it is usually approved that the Arctic Ocean is a truly delicate and significant sector for alterations within the international weather, this quarter is the final significant physiographic province of the earth whose short-and long term geological historical past is far much less recognized compared to different ocean areas. This lack of know-how is especially attributable to the key technological/logistic difficulties in attaining this harsh, ice-covered zone with basic learn vessels and in retrieving lengthy and undisturbed sediment cores. throughout the the final approximately two decades, even though, a number of foreign and multidisciplinary send expeditions, together with the 1st clinical drilling on Lomonosov Ridge in 2004, a break-through in Arctic learn, have been conducted into the critical Artic and its surrounding shelf seas. effects from those expeditions have significantly complicated our wisdom on Arctic Ocean paleoenvironments. released syntheses in regards to the wisdom on Arctic Ocean geology, nonetheless, are in accordance with facts on hand sooner than 1990. A entire compilation of information on Arctic Ocean paleoenvironment and its short-and long term variability according to the massive volume of recent info together with the ACEX drilling facts, has now not been to be had but. With this ebook, featuring (1) precise details on glacio-marine sedimentary approaches and geological proxies used for paleoenvironmental reconstructions, and (2) special geological facts on smooth environments, Quaternary variability on diverse time scales in addition to the long term weather heritage in the course of Mesozoic-Tertiary occasions, this hole in wisdom could be stuffed. *Aimed at experts and graduates *Presents heritage learn, contemporary advancements, and destiny trends*Written by way of a number one pupil and professional
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Additional resources for Arctic Ocean Sediments: Processes, Proxies, and Paleoenvironment
Shallow marine sediments in the Barents Sea show that a connection between the North Atlantic and the Arctic was established long before the opening of this gateway. A complex system of fracture zones and mid-ocean ridges provided a link to the global current circulation system, and consequently enabled an exchange of warm Atlantic and cold Arctic water masses. The opening of the Fram Strait gateway might have allowed for the formation of deep-water currents. Therefore, this event might have had a more dramatic effect on the regional to global palaeoceanographic and palaeoclimatic evolution, probably similar to the opening of the Drake Passage in the Southern Hemisphere.
Murman North Cape C. coastal C. Jan Mayen C. Labrador C. Bear Island C. Norwegian Atlantic C. Pechora C. Norwegian coastal C. Warm current Cold current Irminger C. 8 Surface-water circulation in the Arctic Ocean (from Macdonald, Harner, Fyfe, Loeng, & Weingartner, 2003, supplemented). 8). 3). Through Fram Strait, two major currents, with southward flowing waters on the west and northward flowing waters on the west, exchange water between the Arctic and the North Atlantic: The cold, icetransporting East Greenland Current is the main current out of the Arctic Ocean.
Furthermore, the dense, cold bottom waters of most of the world’s oceans originating in the Nordic Seas and influenced by the Arctic/Atlantic water mass exchange, influence global thermohaline circulation, which drives world climate (see Chapter 6). 16). 15 Reconstruction of the North Atlantic/Arctic gateway palaeogeography for the time slices (A) Late Oligocene (B25 Ma) and Middle Miocene (15 Ma) (from Eide, 2002, supplemented). 1, Mainly continental clastics; 2, deltaic-shallow marine, mainly sand; 3, shallow marine, mainly shales; 10, deeper marine clastics and/or carbonates; and 12, basins formed by oceanic crust.