...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Oceanologia >Nutrient flux fuels the summer primary productivity in the oligotrophic waters of the Gulf of Aqaba, Red Sea
【24h】

Nutrient flux fuels the summer primary productivity in the oligotrophic waters of the Gulf of Aqaba, Red Sea

机译：营养通量为红海亚喀巴湾的贫营养水域的夏季初级生产力提供了燃料

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The thermohaline characteristics of the Gulf of Aqaba, Red Sea, depict a well-defined seasonal pattern of winter mixing from December to April and summer stratification from May to November. This thermohaline structure is a major controlling factor of the nutrient, chlorophyll a and primary productivity seasonal cycles. The nitrate and chlorophyll a concentration records generated down to 200 m at a vertical resolution of 25 m - weekly during 1994, 1995 and every two weeks from April 1997 through to December 2000 - are employed to assess the nitrogen flux across the summer thermocline of the Gulf of Aqaba. The flux calculations are based on a simple diffusion model that incorporates the physical stress eddy diffusivity factor Kz and a biological stress factor k. Both Kz and k are calculated using the Michaelis-Menten equation and the nitrate concentration gradient. The total nitrate flux of the Gulf of Aqaba during the seven summer months (May-November) is estimated at 0.52 mole N m-2. In relation to established primary productivity values (75.5 g C m-2 (May November)-1) and the generated chlorophyll a records, this yields an f fraction of new to total primary production of 0.50. This relatively high f value is discussed with respect to the geophysical characteristics of the Gulf of Aqaba and similar oceanic basins. The remaining 50% is accounted for by cross-sectional flow from the relatively nutrient-rich coral reef coastal habitat and rapid recycling, triggered by high irradiance and water temperature.
机译：红海亚喀巴湾的热盐特征描述了从12月至4月冬季混合和从5月至11月夏季分层的明确季节性模式。该热盐碱结构是养分，叶绿素a和初级生产力季节性周期的主要控制因素。在1994年，1995年以及垂直分辨率为25m的硝酸盐和叶绿素a浓度记录在1994年，1995年期间每周产生一次，从1997年4月到2000年12月每两周产生一次氮流量。亚喀巴湾。通量计算基于一个简单的扩散模型，该模型结合了物理应力涡流扩散因子Kz和生物应力因子k。使用Michaelis-Menten方程和硝酸盐浓度梯度来计算Kz和k。在七个夏季月份（5月至11月），亚喀巴湾的总硝酸盐通量估计为0.52摩尔N m-2。关于既定的初级生产力值（75.5 g C m-2（11月，5月）-1）和生成的叶绿素a记录，新初级生产占总初级生产的f分数为0.50。关于亚喀巴湾和类似海盆的地球物理特征，讨论了相对较高的f值。剩余的50％是由相对富营养的珊瑚礁沿海生境产生的横断面流量和高辐照度和水温引起的快速回收利用造成的。

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