Arctic Ocean Sediments: Processes, Proxies, and by Ruediger Stein (Eds.)

By Ruediger Stein (Eds.)

Even though it is mostly approved that the Arctic Ocean is a truly delicate and critical area for alterations within the international weather, this area is the final significant physiographic province of the earth whose short-and long term geological heritage is far much less identified compared to different ocean areas. This lack of know-how is principally as a result of the main technological/logistic difficulties in achieving this harsh, ice-covered sector with basic study vessels and in retrieving lengthy and undisturbed sediment cores. throughout the the final approximately two decades, besides the fact that, a number of foreign and multidisciplinary send expeditions, together with the 1st clinical drilling on Lomonosov Ridge in 2004, a break-through in Arctic study, have been performed into the significant Artic and its surrounding shelf seas. effects from those expeditions have enormously complicated our wisdom on Arctic Ocean paleoenvironments. released syntheses concerning the wisdom on Arctic Ocean geology, however, are in accordance with info to be had ahead of 1990. A complete compilation of information on Arctic Ocean paleoenvironment and its short-and long term variability in response to the large volume of latest information together with the ACEX drilling information, has no longer been on hand but. With this publication, providing (1) targeted details on glacio-marine sedimentary techniques and geological proxies used for paleoenvironmental reconstructions, and (2) special geological facts on smooth environments, Quaternary variability on assorted time scales in addition to the long term weather background in the course of Mesozoic-Tertiary occasions, this hole in wisdom can be stuffed. *Aimed at experts and graduates *Presents history study, contemporary advancements, and destiny trends*Written by way of a number one pupil and professional

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Ice significantly reduces the heat flux between ocean and atmosphere; through its high albedo it has a strong influence on the radiation budget of the entire Arctic. 8 (Barry, 1996). Thus, over ice surfaces as compared to open water up to eight times as much of the incoming shortwave radiation is reflected, resulting in lower surface temperatures. 4). 1). ), sea ice probably plays a substantial role in climate system variability. There are two primary forms of sea ice: seasonal (or first-year) ice and perennial (or multiyear) ice.

The hatched area close to Lomonosov Ridge marks a zone, which is interpreted as the continent^ocean transition into the Amundsen Basin. Magnetic anomalies are shown on top of both pro¢les. 13, for details and database see Jokat and Micksch (2004). 28 Arctic Ocean Sediments: Processes, Proxies, and Palaeoenvironment Sloan, Thomas, & Billups, 2001). In current models on the causes for the intensive glaciations at the earth’s poles during Cenozoic times, the polar gateways, namely the Fram Strait in the north and the Drake Passage in the south, played an outstanding role.

2003a) with location of the ACEX drill site. (B) Seismic pro¢le AWI 91090 across the Lomonosov Ridge, interpreted as continental crust truncated by a regional unconformity overlain by a continuous sediment sequence ( Jokat, Uenzelmann-Neben, Kristo¡ersen, & Rasmussen, 1992). The four ACEX sites were positioned on this pro¢le, shown as solid vertical lines. , 2006). , 2006). The nuclear icebreaker Sovetskiy Soyuz is crashing the large ice £oes, to be further cut-down then by the icebreaker Oden.

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