Biogenic opal production changes during the Mid-Pleistocene Transition in the Bering Sea (IODP Expedition 323 Site U1343)
Biogenic opal production changes during the Mid-Pleistocene Transition in the Bering Sea (IODP Expedition 323 Site U1343)
复制标题
白令海中更新世过渡期间生物蛋白石产量的变化（IODP 探险队 323 站点 U1343）
DOI：
10.1016/j.yqres.2013.10.001
复制
发表时间：
2013
影响因子：
2.3
通讯作者：
and A. C. Ravelo
中科院分区：
文献类型：
--
作者：
Takahashi;K.;S. Kim;B-K Khim;Y. Kanematsu;H. Asahi;and A. C. Ravelo
生物蛋白石含量和质量积累率（MAR）在IODP远征323站点U1343被发现波动一致，一般是在温暖的条件下，在过去的2.4马在寒冷的条件下低。连续小波变换分析的归一化生物蛋白石含量表明，在白令海的出口生产变化主要在41万年的周期前1.25马，并转移到100万年的周期开始的中更新世过渡（MPT; 1.25-0.7马）。100 ka的周期占主导地位，直到全新世。白令海的出口产量在MPT期间有两次显著下降：第一次发生在MPT初期（1.25 Ma），第二次发生在MPT中期（0.9 Ma）。这些减少与海冰硅藻相对丰度的增加和暖水硅藻物种Neodenticula damaae的减少相吻合，表明白令海在MPT期间出口产量的减少与气候变冷有关。MPT期间白令海出口产量的减少很可能与极地/北极区域对高纬度北太平洋的影响增加有关。
Biogenic opal content and mass accumulation rate (MAR) at IODP Expedition 323 Site U1343 were found to fluctuate consistently, generally being high under warm conditions and low under cold conditions during the last 2.4 Ma. Continuous wavelet transform analysis of the normalized biogenic opal content indicates that export production in the Bering Sea varied predominantly at 41-ka periodicity before 1.25 Ma, and shifted to 100-ka periodicity at the onset of the Mid-Pleistocene Transition (MPT; 1.25–0.7 Ma). The 100-ka cycles dominated until the Holocene. Export production in the Bering Sea decreased markedly in the Bering Sea two times during the MPT: the first occurred at the beginning of the MPT (1.25 Ma) and the second in the middle of the MPT (0.9 Ma). These decreases coincided with both increases in the relative abundance of sea-ice diatoms and decreases in the warm-water diatom species Neodenticula seminae, indicating that reductions in export production in the Bering Sea during the MPT were associated with climate cooling. Decreases in export production in the Bering Sea during the MPT were most likely associated with the increased influence of polar/Arctic domains on the high-latitude North Pacific.