• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of nannoplankton research: A publication of the International Nannoplankton Association >Coccolithophore productivity and surface water dynamics in the Alboran Sea during the last 25 kyr
【24h】

Coccolithophore productivity and surface water dynamics in the Alboran Sea during the last 25 kyr

机译：最近25年内阿尔伯兰海的球石藻生产力和地表水动力学

获取原文
获取原文并翻译 | 示例
       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Coccolithophore productivity and surface water dynamics were deduced for the last 25 kyr from two cores in the Alboran Sea (western Mediterranean), using high-resolution coccolithophore records, oxygen isotopes, and paleotemperature profiles. Combining these proxies with deep-water ventilation proxies, it was possible to determine water column conditions. The distinctive locations of the cores CEUTA10PC08 and HER-GC-T1 allowed us to describe the properties (in terms of nutrient content, salinity, and SST) of the inflowing Atlantic Water (AW), which proved to be a primary control on productivity in the nearby areas of the Strait of Gibraltar. In addition, local factors, such as fluvial discharge and windand eddy-induced upwelling, were proven to influence productivity in even more distant areas where the properties of the incoming AW are more diluted. During the stadials associated with Heinrich events 2 and 1,the water column was stratified due to the inflowing cold and less saline AW, thus preventing primary productivity. This stratification also affected the phases "Termination Ia" and "Termination lb" of the deglaciation that was the result of gradual sea-level rise. Nevertheless, this did not hamper local wind-induced upwelling. An organic-rich layer, recorded during the B?lling-Aller?d interstadial,was likely the partial result of a trend towards increasing coccolithophore productivity. During the Younger Dryas stadial, a colder and drier first phase was recognized, followed by a warmer and wetter second phase. Productivity during these two phases differed from one location to another, depending upon the amount of eastward dilution of the AW and other local factors, such as fluvial discharge. During the Holocene, coccolithophore productivity attained its maximum values, and at the same time experienced large fluctuations. From the onset of modern oceanographic conditions in the Alboran Sea at 7.7 ka cal. BP, the local hydrography, as influenced by the configuration of the Western Anticyclonic Gyre, played an important role in determining coccolithophore productivity and its variability in the study area.
机译：使用高分辨率的球石藻记录，氧同位素和古温度剖面，从阿尔伯兰海（地中海西部）的两个岩心推算了最后25年的球石藻生产力和地表水动力学。将这些代理与深水通风代理结合起来，就可以确定水柱状况。 CEUTA10PC08和HER-GC-T1核心的独特位置使我们能够描述流入的大西洋水（AW）的特性（就营养成分，盐度和SST而言），事实证明这是对大西洋生产力的主要控制。直布罗陀海峡附近地区。此外，事实证明，诸如河流排出物，风和涡流引起的上升流等局部因素会影响到更远的区域，在这些区域中传入的AW的特性更加稀薄。在与海因里希事件2和事件1有关的体育场期间，由于冷水的流入和咸水AW的减少，水柱被分层，从而阻碍了初级生产力。这种分层也影响了冰消作用的“ Termination Ia”和“ Termination lb”阶段，这是海平面逐渐上升的结果。然而，这并没有妨碍局部风诱发的上升流。在Billing-Aller？d沉积期间记录到的富含有机物的层可能是球墨石载体生产率提高趋势的部分结果。在Younger Dryas球场，人们认识到第一阶段较冷和干燥，然后是第二阶段较热和潮湿。这两个阶段的生产率因地点而异，具体取决于AW的向东稀释量和其他局部因素（例如河流排放）。在全新世期间，椰脂石产量达到了最大值，与此同时经历了较大的波动。从Alboran海中7.7 ka cal的现代海洋学条件开始。 BP，受西方反气旋涡旋构造的影响，在确定研究区的球石藻生产力及其变化方面起着重要作用。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号