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Beryllium-7 Elucidate Sediment Dynamics of the Branford River Estuary, Connecticut, USA
Estuaries and Coasts ( IF 2.7 ) Pub Date : 2020-02-18 , DOI: 10.1007/s12237-020-00712-5 Gaboury Benoit , Matthew Hirschbeck , Beth Bisson
Estuaries and Coasts ( IF 2.7 ) Pub Date : 2020-02-18 , DOI: 10.1007/s12237-020-00712-5 Gaboury Benoit , Matthew Hirschbeck , Beth Bisson
Berrylium-7 elucidates sediment dynamics (i.e., sources, sinks, deposition, and resuspension) in a Connecticut estuary. Average annual atmospheric deposition of 7Be is 290 mBq cm−2 year−1. Sediment samples from 43 locations within the estuary show that 7Be deposition is spatially complex, but were statistically indistinguishable a year apart. Weekly time series of sediments indicate that levels are nearly constant on this shorter time scale once radioactive decay is taken into account. 7Be levels in sediments are a balance between steady losses through radioactive decay and periodic pulse inputs following rainstorms. The water column was measured intensively during three rain events, showing that 7Be is removed rapidly from the water column, with a rate constant averaging 1.00 ± 0.12 day−1. A mass balance shows that 7Be is supplied about equally by direct precipitation onto the estuary’s surface and inflow from the watershed. Losses from the water column are split between net sedimentation (43%) and tidal flushing (57%). Variations in sedimentary 7Be levels at very short (meters) and longer (km) distances, and changes at time scales from hours to years, indicate that a large number of samples are required to capture all the variability in these highly dynamic systems. The current study differs from previous research in that a large number of measurements were conducted on a smaller system, and a full mass balance was developed.
中文翻译:
美国康涅狄格州布兰福德河口的铍7澄清沉积物动力学
Berrylium-7阐明了康涅狄格河口的沉积物动力学(即源,汇,沉积和重悬浮)。7 Be的年平均大气沉积为290 mBq cm -2 year -1。来自河口43个位置的沉积物样本显示7 Be沉积在空间上是复杂的,但统计上相差一年。每周的沉积物时间序列表明,一旦考虑到放射性衰变,在较短的时间范围内水平面几乎是恒定的。7沉积物中的Be含量是放射性衰变引起的稳定损失与暴雨后的周期性脉冲输入之间的平衡。在三场降雨事件中对水柱进行了密集测量,表明7将Be从水柱中快速去除,速率常数平均为1.00±0.12天-1。质量平衡表明,通过直接沉淀到河口表面并从分水岭流入,大约平均提供了7 Be。水柱的损失分为净沉降(43%)和潮汐冲刷(57%)。极短(米)和更长(km)距离上的沉积7 Be水平变化,以及从几小时到几年的时间尺度变化,表明需要大量样本才能捕获这些高度动态系统中的所有变化。当前的研究与以前的研究不同之处在于,在较小的系统上进行了大量测量,并开发了完整的质量平衡。
更新日期:2020-02-18
中文翻译:
美国康涅狄格州布兰福德河口的铍7澄清沉积物动力学
Berrylium-7阐明了康涅狄格河口的沉积物动力学(即源,汇,沉积和重悬浮)。7 Be的年平均大气沉积为290 mBq cm -2 year -1。来自河口43个位置的沉积物样本显示7 Be沉积在空间上是复杂的,但统计上相差一年。每周的沉积物时间序列表明,一旦考虑到放射性衰变,在较短的时间范围内水平面几乎是恒定的。7沉积物中的Be含量是放射性衰变引起的稳定损失与暴雨后的周期性脉冲输入之间的平衡。在三场降雨事件中对水柱进行了密集测量,表明7将Be从水柱中快速去除,速率常数平均为1.00±0.12天-1。质量平衡表明,通过直接沉淀到河口表面并从分水岭流入,大约平均提供了7 Be。水柱的损失分为净沉降(43%)和潮汐冲刷(57%)。极短(米)和更长(km)距离上的沉积7 Be水平变化,以及从几小时到几年的时间尺度变化,表明需要大量样本才能捕获这些高度动态系统中的所有变化。当前的研究与以前的研究不同之处在于,在较小的系统上进行了大量测量,并开发了完整的质量平衡。