Determination of water ages and flushing rates using short-lived radium isotopes in large estuarine system, the Yangtze River Estuary, China
Determination of water ages and flushing rates using short-lived radium isotopes in large estuarine system, the Yangtze River Estuary, China
复制标题
利用短寿命镭同位素测定中国长江口大河口系统的水龄和冲刷率
DOI：
10.1016/j.ecss.2013.02.005
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发表时间：
2013-04
期刊：
影响因子：
--
通讯作者：
Zhigang YU
中科院分区：
文献类型：
--
作者：
Natasha Dimova;Liang Zhao;Xueyan Jiang;Zhigang YU
We investigated the spatial and temporal distribution of naturally-occurring short-lived radium isotopes (224Ra, t1/2= 3.6 d and223Ra, t1/2= 11 d) to examine coastal water mixing dynamics of the third world largest estuary, Yangtze River Estuary (YRE) during two field trips in April 2010 and May 2011. Distributions of the224Ra/223Ra activity ratios within the YRE area were used to calculate apparent estuarine water ages. Field-derived results were then compared to hydrodynamic assessments obtained by a Lagrangian particle tracking simulation experiment performed using the Princeton Ocean Model (POM). Water ages obtained via both geotracers and particle tracking agree very well. During both field trips an anomalously “younger” water mass (low salinity and higher radium activities) was observed at about 90–170 km offshore distance from the mouth of the river, suggesting an additional terrestrial water source influenced this area. The temporal distribution of the radium isotopes indicated a semi-diurnal tidal pattern in the YRE with relatively constant isotopic composition of less than a 20% variation during our observations. An integrated water flushing rate based on our observations (excluding the additional anomalous source area) was 8.4 km day−1.
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DOI：
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发表时间：
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期刊：
Limnology and Oceanography: Methods
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