Long term Aleutian Low dynamics and obliquity-controlled oceanic primary production in the mid-latitude western North Pacific (Core MD01-2421) during the last 145,000 years
Long term Aleutian Low dynamics and obliquity-controlled oceanic primary production in the mid-latitude western North Pacific (Core MD01-2421) during the last 145,000 years
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DOI：
10.1016/j.gloplacha.2006.01.017
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发表时间：
2006-08
影响因子：
3.9
通讯作者：
Toshinori Ueshima;Masanobu Yamamoto;T. Irino;T. Oba;M. Minagawa;H. Narita;M. Murayama
中科院分区：
文献类型：
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作者：
Toshinori Ueshima;Masanobu Yamamoto;T. Irino;T. Oba;M. Minagawa;H. Narita;M. Murayama
为了研究阿留申低地是如何对轨道尺度的气候变化做出反应的，我们从北太平洋西部日本中部的MD01-2421地核中获得了过去14.5万年的海洋初级生产记录。总有机碳（TOC）的变化周期为41-ky。高TOC对应于地球倾角的高角度。TOC的变化滞后于倾角变化约1 ky，而底栖有孔虫Uvigerina δ18O的变化滞后于底栖有孔虫δ18O的变化约6 ky。TOC与极环流指数呈反比变化（Mayewski, p.a., Meeker, l.d., Twickler, m.s., Whitlow， S., Yang， Q., Lyons， B., Prentice， M., 1997）。利用11万年冰川化学序列分析北半球高纬度大气环流的主要特征和强迫。j .地球物理学。Res. 102 (C12), 26345-26366 .)。由于黑潮-冈潮混合带的初级生产与冬季阿留申低压的强度有关，这些对应关系暗示冬季阿留申低压的强度响应了北部高纬度地区大气重组的倾角强迫。当倾角较大时，冬季阿留申低压较强，这意味着冬季较低的日照可能增加了陆地和海洋之间的温度对比，加深了冬季阿留申低压。
We have generated an oceanic primary production record from Core MD01-2421, off central Japan, in the western North Pacific, for the last 145,000 years, in order to examine how the Aleutian Low has responded to orbital-scale climate change. The variation of total organic carbon (TOC) was pronounced with a 41-ky periodicity. High TOC corresponds to a high angle of the Earth's obliquity. The variation of TOC was delayed behind the variation of obliquity by ∼ 1 ky and preceded the variation of δ18O of benthic foraminifera Uvigerina by ∼ 6 ky. The TOC varied inversely with Polar Circulation Index (Mayewski, P.A., Meeker, L.D., Twickler, M.S., Whitlow, S., Yang, Q., Lyons, B., Prentice, M., 1997. Major features and forcing of high-latitude northern hemisphere atmospheric circulation using a 110,000-year-long glaciochemical series. J. Geophys. Res. 102 (C12), 26345–26366.). Since the primary production in the Kuroshio–Oyashio mixed zone is related to the intensity of the winter Aleutian Low, these correspondences imply that the intensity of the winter Aleutian Low has responded to the obliquity forcing by the atmospheric reorganization in the northern high latitudes. The winter Aleutian Low was stronger when the obliquity was large, implying that the lower insolation in winter presumably increased the temperature contrast between the land and the ocean, deepening the winter Aleutian Low.