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Variations in the radiolarian assemblages in the Bering Sea since Pliocene and their implications for paleoceanography

To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.palaeo.2014.05.048 Byline: Qiang Zhang, Muhong Chen, Lanlan Zhang, Weifen Hu, Rong Xiang Abstract: Radiolarian assemblages were analyzed using samples from the IODP Site U1340 to reconstruct the paleoceanograp... Full description

Journal Title: Palaeogeography Palaeoclimatology, Palaeoecology, Sept 15, 2014, Vol.410, p.337(14)
Main Author: Zhang, Qiang
Other Authors: Chen, Muhong , Zhang, Lanlan , Hu, Weifen , Xiang, Rong
Format: Electronic Article Electronic Article
Language: English
Subjects:
Quelle: Cengage Learning, Inc.
ID: ISSN: 0031-0182
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recordid: gale_ofa375735166
title: Variations in the radiolarian assemblages in the Bering Sea since Pliocene and their implications for paleoceanography
format: Article
creator:
  • Zhang, Qiang
  • Chen, Muhong
  • Zhang, Lanlan
  • Hu, Weifen
  • Xiang, Rong
subjects:
  • Interglacial Periods -- Analysis
  • Paleoceanography -- Analysis
ispartof: Palaeogeography, Palaeoclimatology, Palaeoecology, Sept 15, 2014, Vol.410, p.337(14)
description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.palaeo.2014.05.048 Byline: Qiang Zhang, Muhong Chen, Lanlan Zhang, Weifen Hu, Rong Xiang Abstract: Radiolarian assemblages were analyzed using samples from the IODP Site U1340 to reconstruct the paleoceanographic conditions in the Bering Sea. Based on the characteristic faunal changes, the radiolarian evolution at Site U1340 was divided into four major intervals from Stages I to IV, with Stage IV divided into Substages IVa and IVb. The radiolarians in each stage recorded significant paleoenvironmental conditions. In general, the Bering Sea was governed by an ocean ecological environment with stable warm and saline surface water during Stage I (4.15Myr to 3.91Myr). The environment in the Bering Sea fluctuated strongly during Stage II (3.91Myr to 2.75Myr) and was controlled by the cold-water masses and sea ices during Stage III (2.75Myr to 1.07Myr) with the gradual development of cold and well-ventilated intermediate water. Stage IVa (1.07Myr to 0.47Myr) was a transitional period characterized by the enhanced formation of cold subsurface and intermediate water as well as of the oxygen-rich deep water. During Stage IVb (after 0.47Myr), the Bering Sea was mainly characterized by enhanced warmth during interglacial episodes and well-developed water layers that were generally comparable to those of the modern Bering Sea. These conditions indicated that the vertical water-mass structure of the modern Bering Sea began to form since 0.47Ma. Every Stage boundary in the studied core was marked by notable changes in the radiolarian assemblages. These changes corresponded to the climatic cooling event at ~3.91Ma, the intensification of Northern Hemisphere glaciation at ~2.75Ma, the beginning of the middle Pleistocene transition at ~1.07Ma, and the low-latitude radiolarian ecology event at ~0.47Ma. In addition, the relative abundance pattern of Cycladophora davisiana indicates that the Bering Sea was the main source of the past North Pacific Intermediate Water at ca. 0.85Ma (MIS22), ca. 0.63Ma (MIS16), and ca. 0.18Ma (MIS6), just as it was during the last glacial maximum. Article History: Received 28 November 2013; Revised 30 April 2014; Accepted 30 May 2014
language: English
source: Cengage Learning, Inc.
identifier: ISSN: 0031-0182
fulltext: fulltext
issn:
  • 0031-0182
  • 00310182
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titleVariations in the radiolarian assemblages in the Bering Sea since Pliocene and their implications for paleoceanography
creatorZhang, Qiang ; Chen, Muhong ; Zhang, Lanlan ; Hu, Weifen ; Xiang, Rong
ispartofPalaeogeography, Palaeoclimatology, Palaeoecology, Sept 15, 2014, Vol.410, p.337(14)
identifierISSN: 0031-0182
subjectInterglacial Periods -- Analysis ; Paleoceanography -- Analysis
descriptionTo link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.palaeo.2014.05.048 Byline: Qiang Zhang, Muhong Chen, Lanlan Zhang, Weifen Hu, Rong Xiang Abstract: Radiolarian assemblages were analyzed using samples from the IODP Site U1340 to reconstruct the paleoceanographic conditions in the Bering Sea. Based on the characteristic faunal changes, the radiolarian evolution at Site U1340 was divided into four major intervals from Stages I to IV, with Stage IV divided into Substages IVa and IVb. The radiolarians in each stage recorded significant paleoenvironmental conditions. In general, the Bering Sea was governed by an ocean ecological environment with stable warm and saline surface water during Stage I (4.15Myr to 3.91Myr). The environment in the Bering Sea fluctuated strongly during Stage II (3.91Myr to 2.75Myr) and was controlled by the cold-water masses and sea ices during Stage III (2.75Myr to 1.07Myr) with the gradual development of cold and well-ventilated intermediate water. Stage IVa (1.07Myr to 0.47Myr) was a transitional period characterized by the enhanced formation of cold subsurface and intermediate water as well as of the oxygen-rich deep water. During Stage IVb (after 0.47Myr), the Bering Sea was mainly characterized by enhanced warmth during interglacial episodes and well-developed water layers that were generally comparable to those of the modern Bering Sea. These conditions indicated that the vertical water-mass structure of the modern Bering Sea began to form since 0.47Ma. Every Stage boundary in the studied core was marked by notable changes in the radiolarian assemblages. These changes corresponded to the climatic cooling event at ~3.91Ma, the intensification of Northern Hemisphere glaciation at ~2.75Ma, the beginning of the middle Pleistocene transition at ~1.07Ma, and the low-latitude radiolarian ecology event at ~0.47Ma. In addition, the relative abundance pattern of Cycladophora davisiana indicates that the Bering Sea was the main source of the past North Pacific Intermediate Water at ca. 0.85Ma (MIS22), ca. 0.63Ma (MIS16), and ca. 0.18Ma (MIS6), just as it was during the last glacial maximum. Article History: Received 28 November 2013; Revised 30 April 2014; Accepted 30 May 2014
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descriptionTo link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.palaeo.2014.05.048 Byline: Qiang Zhang, Muhong Chen, Lanlan Zhang, Weifen Hu, Rong Xiang Abstract: Radiolarian assemblages were analyzed using samples from the IODP Site U1340 to reconstruct the paleoceanographic conditions in the Bering Sea. Based on the characteristic faunal changes, the radiolarian evolution at Site U1340 was divided into four major intervals from Stages I to IV, with Stage IV divided into Substages IVa and IVb. The radiolarians in each stage recorded significant paleoenvironmental conditions. In general, the Bering Sea was governed by an ocean ecological environment with stable warm and saline surface water during Stage I (4.15Myr to 3.91Myr). The environment in the Bering Sea fluctuated strongly during Stage II (3.91Myr to 2.75Myr) and was controlled by the cold-water masses and sea ices during Stage III (2.75Myr to 1.07Myr) with the gradual development of cold and well-ventilated intermediate water. Stage IVa (1.07Myr to 0.47Myr) was a transitional period characterized by the enhanced formation of cold subsurface and intermediate water as well as of the oxygen-rich deep water. During Stage IVb (after 0.47Myr), the Bering Sea was mainly characterized by enhanced warmth during interglacial episodes and well-developed water layers that were generally comparable to those of the modern Bering Sea. These conditions indicated that the vertical water-mass structure of the modern Bering Sea began to form since 0.47Ma. Every Stage boundary in the studied core was marked by notable changes in the radiolarian assemblages. These changes corresponded to the climatic cooling event at ~3.91Ma, the intensification of Northern Hemisphere glaciation at ~2.75Ma, the beginning of the middle Pleistocene transition at ~1.07Ma, and the low-latitude radiolarian ecology event at ~0.47Ma. In addition, the relative abundance pattern of Cycladophora davisiana indicates that the Bering Sea was the main source of the past North Pacific Intermediate Water at ca. 0.85Ma (MIS22), ca. 0.63Ma (MIS16), and ca. 0.18Ma (MIS6), just as it was during the last glacial maximum. Article History: Received 28 November 2013; Revised 30 April 2014; Accepted 30 May 2014
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abstractTo link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.palaeo.2014.05.048 Byline: Qiang Zhang, Muhong Chen, Lanlan Zhang, Weifen Hu, Rong Xiang Abstract: Radiolarian assemblages were analyzed using samples from the IODP Site U1340 to reconstruct the paleoceanographic conditions in the Bering Sea. Based on the characteristic faunal changes, the radiolarian evolution at Site U1340 was divided into four major intervals from Stages I to IV, with Stage IV divided into Substages IVa and IVb. The radiolarians in each stage recorded significant paleoenvironmental conditions. In general, the Bering Sea was governed by an ocean ecological environment with stable warm and saline surface water during Stage I (4.15Myr to 3.91Myr). The environment in the Bering Sea fluctuated strongly during Stage II (3.91Myr to 2.75Myr) and was controlled by the cold-water masses and sea ices during Stage III (2.75Myr to 1.07Myr) with the gradual development of cold and well-ventilated intermediate water. Stage IVa (1.07Myr to 0.47Myr) was a transitional period characterized by the enhanced formation of cold subsurface and intermediate water as well as of the oxygen-rich deep water. During Stage IVb (after 0.47Myr), the Bering Sea was mainly characterized by enhanced warmth during interglacial episodes and well-developed water layers that were generally comparable to those of the modern Bering Sea. These conditions indicated that the vertical water-mass structure of the modern Bering Sea began to form since 0.47Ma. Every Stage boundary in the studied core was marked by notable changes in the radiolarian assemblages. These changes corresponded to the climatic cooling event at ~3.91Ma, the intensification of Northern Hemisphere glaciation at ~2.75Ma, the beginning of the middle Pleistocene transition at ~1.07Ma, and the low-latitude radiolarian ecology event at ~0.47Ma. In addition, the relative abundance pattern of Cycladophora davisiana indicates that the Bering Sea was the main source of the past North Pacific Intermediate Water at ca. 0.85Ma (MIS22), ca. 0.63Ma (MIS16), and ca. 0.18Ma (MIS6), just as it was during the last glacial maximum. Article History: Received 28 November 2013; Revised 30 April 2014; Accepted 30 May 2014
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