...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Ocean Dynamics >Water intrusions and particle signatures in the Black Sea: a Biogeochemical-Argo float investigation
【24h】

Water intrusions and particle signatures in the Black Sea: a Biogeochemical-Argo float investigation

机译：黑海中的水入侵和颗粒特征：生物地球化学-Argo浮标研究

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

Continuous observations during 3 years with a vertical resolution of 1 dbar from two Bio-Argo floats in the Black Sea that were equipped with oxygen optodes, chlorophyll fluorometers, and backscattering sensors are analyzed. The particle backscattering coefficient, b(bp) provides a proxy for the concentration of suspended particles. The observations clearly identify thermal and b(bp) intrusions down to similar to 700-800 m in the Bosporus inflow area. In this area, b(bp) is more than five times larger than elsewhere, which could indicate bacterial abundance and possible biological involvement in the precipitation of Mn-containing particles. The b(bp) anomalies become much shallower than the temperature anomalies with increasing distance to the east of the strait. Their maxima are located between the onset of the suboxic zone and the upper part of the anoxic layer. Unlike well-known intrusions that are caused by inflow, open ocean intrusions are shallower and often characterized by multiple layers of backscatter maxima with thicknesses of only 15-20 m. The ratio between backscattering coefficients measured at two wavelengths, which gives a proxy for particle size, shows that the relative amount of larger size particles in the anoxic layer increases with depth. The particle concentrations and their size distribution display different vertical variability, which indicates the complex transformation of biological matter. The lower concentration of particles and lower chlorophyll-a during the extremely warm 2016 reveals an overall positive correlation between the two properties. The trends in the particle backscattering coefficient in the suboxic zone during 2013-2016 could indirectly reveal a biogeochemical response to temperature changes.
机译：分析了黑海中两个装有氧气光电二极管，叶绿素荧光计和反向散射传感器的Bio-Argo浮标在3年内的垂直分辨率为1 dbar的连续观测结果。粒子的反向散射系数b（bp）提供了悬浮粒子浓度的替代指标。这些观察清楚地确定了在博斯普鲁斯海峡流入地区热和b（bp）侵入低至700-800 m。在该区域中，b（bp）比其他地方大五倍以上，这可能表明细菌的丰度以及可能的生物参与了含锰颗粒的沉淀。随着距海峡东部的距离增加，b（bp）异常变得比温度异常浅得多。它们的最大值位于低氧区的起点和缺氧层的上部之间。与由流入引起的众所周知的侵入不同，公海侵入较浅并且通常以多层背向散射最大值为特征，其厚度仅为15-20 m。在两个波长处测得的反向散射系数之间的比值（可以表示颗粒大小）表明，缺氧层中较大尺寸颗粒的相对数量随深度增加。颗粒浓度及其尺寸分布显示出不同的垂直变化性，这表明生物物质的复杂转化。在极度温暖的2016年，较低的颗粒浓度和较低的叶绿素-a揭示了这两种特性之间的总体正相关。在2013-2016年间，亚缺氧区颗粒反向散射系数的趋势可能间接揭示了生物地球化学对温度变化的响应。

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