Sinking velocity of particulate radiocesium in the northwestern North Pacific
Sinking velocity of particulate radiocesium in the northwestern North Pacific
复制标题
北太平洋西北部颗粒放射性铯的下沉速度
DOI：
10.1002/2014gl060126
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发表时间：
2014
影响因子：
5.2
通讯作者：
H. Kawakami
中科院分区：
文献类型：
--
作者：
M. Honda;H. Kawakami
在福岛第一核电站事故发生前后，利用时间序列沉积物捕集器在西北太平洋两个深度收集了沉降颗粒（SP），并测量了事故产生的放射性颗粒。事故发生后约2周（1个月），在500米（4810米）处首次检测到放射性铯（137Cs）。1年以上SP的137Cs显示，两次深度之间的时间滞后比第一次137Cs探测的时间滞后（约2周）要大。从两个深度的累积时间137Cs通量和时间滞后估计了瞬态下沉速度（SV）。虽然早期收集的SP的SV很大，但大多数颗粒（约80%）的SV估计在50 m d−1左右。根据总SP中137Cs浓度与无有机物SP中137Cs浓度的比较，我们推测大部分137Cs可能被掺入到铝硅酸盐中。
Sinking particles (SP) were collected by time series sediment traps at two depths in the northwestern Pacific before and after the Fukushima Daiichi Nuclear Power Plant accident, and accident‐derived particulate radiocesium was measured. Radiocesium (137Cs) was first detected at 500 m (4810 m) about 2 weeks (1 month) after the accident. 137Cs of SP collected over 1 year revealed that the time lag between two depths was larger than that for the first 137Cs detection (about 2 weeks). We estimated the transient sinking velocity (SV) from the cumulative temporal 137Cs flux and the time lags at the two depths. Although the SV of SP collected in very early period was large, the estimated SV of most particulate 137Cs (about 80%) was about 50 m d−1. Based on comparison of 137Cs concentration in total SP with that in SP without organic materials, we suspect that most of the 137Cs was likely incorporated into aluminosilicates.
影响因子：
4.9
作者：
Honda, M. C.;Kawakami, H.;Saino, T.
通讯作者：
Saino, T.
影响因子：
4.6
作者：
Adachi, Kouji;Kajino, Mizuo;Zaizen, Yuji;Igarashi, Yasuhito
通讯作者：
Igarashi, Yasuhito