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Late quaternary ice-rafted detritus events in the Chukchi Basin, western Arctic Ocean
  • ISSN号:1001-6538
  • 期刊名称:Chinese Science Bulletin
  • 时间:2010.2
  • 页码:432-440
  • 分类:P731.11[天文地球—海洋科学] S718.54[农业科学—林学]
  • 作者机构:[1]State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China, [2]Institute of Marine Organic Geochemistry, Ocean University of China, Qingdao 266100, China
  • 相关基金:We thank two anonymous reviews and the editor, whose comments and sug- gestions improved this paper. Thanks also to the Kochi Core Center (Japan) for providing the samples ,for this study. This work was supported by the National Natural Science Foundation of China (40321603 and 40676030), the National Basic Research Program of China (2007CB815903) and the Chinese IPY Program (2007-2009).
  • 相关项目:重建西北冰洋晚第四纪的古海洋与古气候演变历史
中文摘要:

半球中间纬度的 westerlies 贡献深南部的海洋的通风(那么) ,并且开车在大气的二氧化碳(CO2 ) 和全球气候变化。作为 westerlies 控制直接海洋的前面,副热带的前面(STF ) 的运动反映 westerlies 移植。因此理解在 STF 运动和 weaterlies 之间的关系是重要的,通风深那么,冰体积和大气的 CO2。到这个目的,我们从早海洋的同位素舞台( MIS )使用二个新高分辨率的记录 20 (锝? 00 ka )海表面温度( SST ),基于 U 37k 鈥?,在钻的海洋的paleo温度计和 benthic 氧同位素( 未1 8OB )编程序( ODP )在南部的 Tasman 海的地点 1170B (圣),从南极冰核心构造在海洋的记录和大气的代理之间的连接。在最后 800 ka 期间,在地点 1170B 的平均 SST (10.2 掳 C ) 是比今天低的 1.8 掳 C (年度一般水准 12 掳 C ) 。11.6 掳 C 的最高平均的 SST 在 MIS 1 期间发生了,并且 7.8 掳 C 的最低平均 SST 发生在 MIS 2 期间。14.7 掳 C 和 6.2 掳 C 的最温暖、最冷的记录分别地发生在 MIS 5 和 MIS 2。在最后 800 ka 的冰川间冰期的周期,重建的 SST 的可变性证明 STF 向北方移动了或向南方纬度的超过 3 掳与它的现在的地点相比。在最温暖的阶段 MIS 5, STF 转移了 9 掳 S 到它锝 ? 的极南的地点。在最冷的阶段 MIS 2,相反, STF 移动了 3 掳 S 到它锝 ? 的极北的地点。响应轨道的周期, westerlies 运动带了冰体积和大气的 CO2 变化,但是它在有在南极大气的温度的变化的阶段。冰体积仅仅在 23-ka 领前乐队仅仅有点先于大气的 CO2,落后在 100-ka 怪癖乐队的大气的 CO2,并且在有在 40-ka 斜乐队的大气的 CO2 的阶段。

英文摘要:

Southern Hemisphere mid-latitude westerlies contribute to the ventilation of the deep Southern Ocean (SO), and drive changes in atmospheric carbon dioxide (CO2) and the global climate. As the westerlies control directly oceanic fronts, the movement of the subtropical front (STF) reflects the westerlies migration. Thus it is important to understand the relationships between STF movement and the weaterlies, ventilation of the deep SO, ice volume and atmospheric CO2. To this end, we use two new high-resolution records from early Marine Isotope Stage (MIS) 20 (-800 ka) of sea surface temperature (SST) based on U k 37 paleo-thermometer and benthic oxygen isotope (filSOB) at Ocean Drilling Program (ODP) Site 1170B in the southern Tasman Sea (STS), to construct linkages between the marine records and atmospheric proxies from Antarctic ice-cores. During the last 800 ka, the average SST (10.2℃) at Site 1170B is 1.8℃ lower than today (annual average 12℃). The highest average SST of 11.6℃ occurred during MIS 1, and the lowest average SST of 7.8℃ occurred during MIS 2. The warmest and coldest records of 14.7℃ and 6.2℃ occurred in the MIS 5 and MIS 2, respectively. In the glacial-interglacial cycles of the last 800 ka, variability of reconstructed SST shows that the STF moved northward or southward more than 3° of latitude compared with its present location. In the warmest stage MIS 5, the STF shifted to its southernmost location of -49°S. In contrast, in the coldest stage MIS 2, the STF moved to its northernmost location of -43°S. In response to orbital cycles, the westerlies movement led ice volume and atmospheric CO2 changes, but it was in phase with change in Antarctic atmospheric temperature. Ice volume only preceded atmospheric CO2 only a little at the 23-ka precession band, lagged the atmospheric CO2 at the 100-ka eccentricity band, and was in phase with atmospheric CO2 at the 40-ka obliquity band.

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