检索结果-南通市图书馆

Particulate organic carbon export flux by ^(234)Th/^(238)U disequilibrium in the continental slope of the East China Sea

引用

Acta Oceanologica Sinica 2013年第10期32卷 67-73页

作者： BI Qianqian DU Jinzhou WU Ying ZHOU Jing ZHANG Jing State Key Laboratory of Estuarine and Coastal Research East China Normal University

234Th is widely used to quantify the magnitude of upper ocean particulate organic carbon （poc） export in oceans. In the present work, the rates of particulate organic carbon export were measured based on the distribution patterns of 234Th/238U disequilibrium in the water column within the continental slope of the East China Sea （ECS） during May 2011. The profiles of particulate and dissolved 234Th activities at all three stations showed a relative deficit with respect to 238U in the upper 100 m of the water column. The dissolved 234Th scavenging rates and the particulate 234Th removal rates and their residence times were calculated by a one-dimensional steady state model. The results showed that the dissolved a34Th scavenging rates and the particulate 234Th removal rates ranged from 12.4-61.4 dpm/（m3.d） and from 3.8-21.8 dpm/（m3.d）, respectively. The residence times of dissolved and particulate 234Th were in the range of 3.4-158 d and 63.7- 96.5 d, respectively. Combined with the measurement of poc/Z34Th ratios of suspended particles, poc export flux （calculated by carbon） from the euphotic zone was estimated in the study region, which ranged from 4.14-14.7 mmol/（m2 .d）, with an average of 8.21 mmol/（m3.d）, occupying 35% of the prime productivity in the study area. The results of this study can provide new information for better understanding the carbon biogeochemical cycle within the continental slope of the ECS.

关键词： 234Th/238U disequilibrium residence time poc export East China Sea (ECS)

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

^(234)Th/^(238)U disequilibrium and particulate organic carbon export in the northwestern South China Sea

引用

Acta Oceanologica Sinica 2011年第3期30卷 55-62页

作者： MA Hao ZENG Zhi YU Wen HE Jianhua CHEN Liqi CHENG Jianping YIN Mingduan ZENG Shi Department of Engineering Physics Tsinghua University Beijing 100084 China Key Laboratory of Global Change and Marine-Atmospheric Chemistry State Oceanic Administration Xiamen 361005 China Key Laboratory of Particle ＆ Radiation Imaging （Tsinghua University） Ministry of Education Beijing 100084 China Key Laboratory of High Energy Radiation Imaging Fundamental Science for National Defense Beijing 100084 China

234Th was utilized as a tracer of particulate organic carbon （poc） export in the northwestern South China Sea （SCS） on the basis of the data collected at four stations during a spring cruise. Depth profiles of dissolved and particulate 234Th activities were measured in the upper 60m, showing a significant deficit relative to 23Su over the investigated stations. A stratified structure of 234Th-23su disequilibrium was in general observed in the upper 60 m water column, indicating that the euphotic zone of the northwestern SCS in this reason can be divided into two layers, an upper and lower layer, with different export rates. poc export fluxes were estimated from a one-dimensional steady state model of 234Th fluxes in combination with the measurement of poc/234Th ratios on suspended particles. The poc export in this region ranged from 8.2 to 20.0 mmol/（m2.d）, with an average of 16.0 mmol/（m2-d）, and was slightly higher than those previously reported in the southern SCS.

关键词： 234Th 23su disequilibrium poc export South China Sea

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Particle dynamics revealed by^(210)Po/^(210)Pb disequilibria around Prydz Bay,the Southern Ocean in summer

引用

Advances in Polar Science 2022年第1期33卷 71-85页

作者： CHEN Mengya CHEN Min ZHENG Minfang QIU Yusheng ZHU Jing QIAN Qiankun College of Ocean and Earth Sciences Xiamen UniversityXiamen 361102China

Seawater samples were collected around Prydz Bay in summer of 2014,dissolved and particulate^(210)Po and^(210)Pb were measured to reveal the disequilibrium characteristics and particle *** results show that the distribution of^(210)Po and^(210)Po/^(210)Pb activity ratio in the upper water is mainly affected by biological absorption or particle *** abnormal excess of^(210)Po relative to^(210)Pb was observed in the surface water at stations P1-2 and P2-2,which is likely to be the horizontal transport of water mass with high DPo/DPb)_(A.R.)and TPo/TPb)_(A.R.).In this study,the removal of particulate^(210)Po is mainly controlled by the scavenging of dissolved^(210)Po and the two have a linear positive correlation with the salinity,a negative linear correlation with the content of dissolved oxygen and a reciprocal relationship with the content of *** export flux of poc at 100 m is estimated to be 1.8-4.4 mmol·m^(−2)·d^(−1)(avg.2.9 mmol·m^(−2)·d^(−1))based on^(210)Po/^(210)Pb disequilibria,with the highest value in the shelf,which is consistent with the distribution of biological productivity.

关键词： ^(210)Po/^(210)Pb disequilibria ^(210)Po excess particle dynamics poc export Prydz Bay

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：