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首页> 外文期刊>Journal of oceanography >Nearshore scavenging phenomenon elucidated by 234th/238u disequilibrium in the coastal waters off Western Taiwan
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Nearshore scavenging phenomenon elucidated by 234th/238u disequilibrium in the coastal waters off Western Taiwan

机译：台湾西部沿海水域的234th / 238u不平衡现象阐明了近岸清除现象

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摘要

Dissolved and particulate 234Th activities in surface seawater were determined at 27 stations along the coastline of western Taiwan during 19–23 November 2004. Contrasting scavenging settings were observed between the northern and southern regimes of the nearshore water off western Taiwan, separated by the Cho-Shui River. The northern regime is characterized by a large quantity of suspended load contributed by northward transport of a suspension plume from the Cho-Shui River, while the southern regime, low in suspended load and high in chlorophyll concentration, is a system controlled by biological activity. A scavenging model that takes account of the physical transport was used to estimate the 234Th budget in order to estimate the scavenging and removal rates from the nearshore water. The scavenging and removal rates ranged from 21 to 127 dpm m?3d?1 and from 36 to 525 dpm m?3d?1, for dissolved and particulate 234Th, respectively. The removal fluxes of particulate organic carbon (POC) and particulate organic nitrogen (PON) were estimated by multiplying the particulate 234Th removal flux to the organic carbon/234Th and nitrogen/234Th ratios in suspended particles, which ranged from 4.5 to 275.2 mmol-C m?2d?1 and from 1.3 to 50.1 mmol-N m?2d?1, respectively. These fluxes resulted in residence times of 1～20 days for the POC in the surface water of nearshore water off western Taiwan.
机译：2004年11月19日至23日，在台湾西部沿海27个站点确定了表层海水中溶解的234Th颗粒物活动。在台湾西部近海水域的北部和南部水域之间发现了相反的清除环境，这些区域被Cho-Cho分开。水河。北部地区的特点是悬浮水流从长水河向北迁移，造成大量的悬浮负载，而南部地区的悬浮负载低且叶绿素浓度高，是受生物活性控制的系统。考虑物理运输的清除模型用于估算234Th预算，以便估算近岸水体的清除率和清除率。对于溶解的234Th和颗粒状的234Th，清除和去除速率分别为21至127dpm·m·3d·1和36至525dpm·m·3d·1。通过将颗粒234Th去除通量乘以悬浮颗粒中有机碳/ 234Th和氮/ 234Th的比率（范围为4.5至275.2 mmol-C），估算颗粒有机碳（POC）和颗粒有机氮（PON）的去除通量m 2 2d -1和1.3至50.1mmol-N m 2 2d -1。这些通量导致POC在台湾西部沿海近地表水中的停留时间为1〜20天。

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