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首頁> 外文期刊>Deep-Sea Research >Pliocene and Pleistocene paleoceanography in the western subarctic Pacific based on diatom analyses of ODP Leg 145 Hole 884B and IODP Expedition 323 Holes U1341B and U1343E
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Pliocene and Pleistocene paleoceanography in the western subarctic Pacific based on diatom analyses of ODP Leg 145 Hole 884B and IODP Expedition 323 Holes U1341B and U1343E

機(jī)譯：基于ODP腿145孔884B和IODP遠(yuǎn)征323孔U1341B和U1343E的硅藻分析，研究了北極西太平洋上的上新世和更新世古海洋學(xué)。

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Late Pliocene-Pleistocene fossil diatom assemblages from Ocean Drilling Program (ODP) Leg 145 Hole 884B in the western subarctic Pacific were investigated to improve the diatom biostratigraphy. Moreover, the paleoceanographic records at Hole 884B were compared with those in Integrated Ocean Drilling Program (IODP) Expedition 323 Holes U1341B and U1343E in the Bering Sea for the time interval of 2.50 Ma in order to clarify the differences in the diatom assemblage fluctuations and the history of past ocean circulations around the subarctic Pacific. In Hole 884B, five diatom zones from the Neodenticula koizumii-Neodenticula kamtschatica Zone to the Neodenticula seminae Zone were identified. The decreases in the relative abundance of temperate-water species were recognized at ca. 1.9 Ma in Hole U1343E, ca. 2.1 Ma in Holes 884B and U1341B. The decreases of the temperate-water species at these sites indicate that a widespread cooling event must have occurred over the subarctic Pacific at similar to 2 Ma. In addition, the continuous low occurrences of the sea-ice related species from around 2 Ma onward, which indicate the presence of sea-ice, were observed at Sites 884 and U1341. We also point out that the age differences in decrease of temperate-water species at the three sites (i.e., delay in response of the temperate-water species at Site U1343) may be related to changes of seawater inflow from the North Pacific to Sites U1341 and U1343 and of the East Kamchatka Current from the Bering Sea to Site 884. (C) 2015 Elsevier Ltd. All rights reserved.
機(jī)譯：研究了北大西洋西部太平洋海洋鉆探計(jì)劃（ODP）腿145孔884B的上新世-更新世化石硅藻組合，以改善硅藻的生物地層學(xué)。此外，將884B孔的古海洋學(xué)記錄與白令海綜合海洋鉆探計(jì)劃（IODP）遠(yuǎn)征323孔U1341B和U1343E的時間間隔為2.50 Ma進(jìn)行了比較，以闡明硅藻組合起伏和北極近太平洋過去海洋環(huán)流的歷史。在884B洞中，確定了五個小硅藻帶，它們分別是小新根尖藻—新尖葉根尖藻（Neodenticula kamtschatica）區(qū)域到半新葉尖藻（Neodenticula seminae）區(qū)。溫帶水物種相對豐度的降低在約時被確認(rèn)。大約為1.9 Ma，位于U1343E孔中?？?84B和U1341B中有2.1 Ma。這些地點(diǎn)的溫帶水物種的減少表明，北極洋太平洋上一定已經(jīng)發(fā)生了類似于2 Ma的大范圍降溫事件。此外，在884和U1341站點(diǎn)觀察到從大約2 Ma開始，與海冰有關(guān)的物種持續(xù)低發(fā)，這表明存在海冰。我們還指出，這三個地點(diǎn)的溫帶水物種減少的年齡差異（即，地點(diǎn)U1343的溫帶水物種的響應(yīng)延遲）可能與從北太平洋流入地點(diǎn)U1341的海水變化有關(guān)。和U1343以及從白令海到884號站點(diǎn)的東堪察加海流。（C）2015 Elsevier Ltd.保留所有權(quán)利。

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  • 來源
    《Deep-Sea Research》 |2016年第maraaap期|29-37|共9頁
  • 作者單位

    Nagoya Univ, Grad Sch Environm Studies, Dept Earth & Planetary Sci, Chikusa Ku, Nagoya, Aichi 4648601, Japan;

    Japan Agcy Marine Earth Sci & Technol, Res Inst Global Change, Natsushima Cho 2-15, Yokosuka, Kanagawa 2370061, Japan;

    Nagoya Univ, Grad Sch Environm Studies, Dept Earth & Planetary Sci, Chikusa Ku, Nagoya, Aichi 4648601, Japan;

    NTT COMWARE Co Ltd, NGN Operat Syst Div, SO Solut Dept, Minato Ku, 1-9-1 Kounan, Tokyo 1088019, Japan;

    Kyushu Univ, Dept Earth & Planetary Sci, Higashi Ku, Hakozaki 6-10-1, Fukuoka 8128581, Japan|Hokusei Gakuen Univ, Sch Social Welf, Atsubetsu Ku, Ohyachi Nishi 2-3-7, Sapporo, Hokkaido 0048631, Japan;

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  • 正文語種 eng
  • 中圖分類
  • 關(guān)鍵詞

    Diatom; Paleoceanography; Subarctic Pacific; Bering Sea; East Kamchatka Current; Aleutian Passes; Pleistocene; Pliocene;

    機(jī)譯：硅藻;古海洋學(xué);北極太平洋;白令海;東部堪察加海流;阿留申P(guān)ass口;更新世;上新世;

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