...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Estuarine Coastal and Shelf Science >Oxygen consumption in the water column and sediments of the northern Gulf of Mexico hypoxic zone
【24h】

Oxygen consumption in the water column and sediments of the northern Gulf of Mexico hypoxic zone

机译：墨西哥湾北部低氧区水柱和沉积物中的耗氧量

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

Hypoxia is a global problem resulting from excessive nutrient inputs to coastal regions, but the biogeochemical mechanisms of hypoxia development are not well understood. The primary location of oxygen consumption (i.e., sediments versus water column) is still debated and may depend on the analytical approach used. In this study, oxygen respiration was measured using incubations combined with membrane inlet mass spectrometry in sediments, water overlying sediments, and the water column in the Gulf of Mexico hypoxic zone. Water column respiration ranged from 0.09 to 4.42 μmol O_2 l~(-1) h~(-1) (mean = 0.77 ± 0.07 (standard error)) and was significantly higher shortly after two hurricanes. Overlying water respiration ranged from 0.31 to 2.46 |imol O2 I"1 h 1 (mean = 0.70 ± 0.09) and accounted for 3.7 ± 0.8% of total below-pycnocline respiration. Sediment oxygen consumption, measured using a continuous-flow incubation technique, was lowest after the two hurricanes and ranged from 408 to 1800 μmol O_2 m~(-2) h~(-1) (mean = 834 ± 83.8 μmol O_2 m~(-2) h~(-1)). Sediments accounted for 25 ± 5.3% of total below-pycnocline respiration, and sediment oxygen consumption was related negatively to ambient bottom-water oxygen concentration. This negative relationship contradicts previous literature and suggests that high sediment oxygen consumption is driven by abundant, fresh organic material and regulates bottom-water oxygen concentration, rather than the common assumption that bottom-water oxygen concentration determines sediment oxygen consumption. The results from this study suggest that storms and mixing events may lead to conditions suitable for hypoxia redevelopment in as little as two days after disturbances, with the water column playing a critical role in system hypoxia development and maintenance.
机译：低氧是一个全球性的问题，是由于沿海地区过多的养分投入造成的，但对低氧发展的生物地球化学机制尚不十分了解。耗氧量的主要位置（即沉积物与水柱的相对位置）仍在争论中，可能取决于所使用的分析方法。在这项研究中，利用孵化结合膜入口质谱法测量了墨西哥湾缺氧区的沉积物，上覆水沉积物和水柱中的氧气呼吸。水柱呼吸的范围从0.09到4.42μmolO_2 l〜（-1）h〜（-1）（平均值= 0.77±0.07（标准误）），并且在两次飓风过后不久明显升高。上层呼吸水量为0.31到2.46 | imol O2 I“ 1 h 1（平均= 0.70±0.09），占总下呼吸道呼吸量的3.7±0.8％。使用连续流孵化技术测得的沉积物耗氧量，在两次飓风之后最低，范围为408至1800μmolO_2 m〜（-2）h〜（-1）（平均值= 834±83.8μmolO_2 m〜（-2）h〜（-1））。低于下呼吸道总呼吸量的25±5.3％，沉积物耗氧量与周围底部水氧浓度呈负相关，这种负相关关系与先前的文献相矛盾，表明高沉积物耗氧量是由丰富的新鲜有机物质驱动并调节底部水的氧气浓度，而不是通常的假设，即底部水的氧气浓度决定了沉积物的氧气消耗；这项研究的结果表明，暴风雨和混合事件可能会导致适合低氧再造的条件。作为干扰后两天，水柱在系统缺氧的发展和维持中起着关键作用。

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