中文摘要：

234Th 广泛地被用来确定上面的海洋微粒的大小在海洋的器官的碳(停靠港) 出口。在现在的工作，微粒的率器官的碳出口在 2011 年 5 月期间在华东海(ECS ) 的大陆人斜坡以内在水列基于 234Th/238U 不平衡的分发模式被测量。微粒和根本，三个车站显示出的溶解 234Th 活动的侧面关于在水列的上面的 100m 的 238U 的相对赤字。清除评估的溶解 234Th 和微粒 234Th 移动率和他们的住处时间由一个一个维的稳定的州的模型是计算的。结果证明清除的溶解 234Th 评价，微粒 234Th 移动率从 12.461.4 dpm/(m3 睴牡 ? 汰瑡潦浲氠祡牥愠摮愠 ? 灡汰捩瑡潩 ? 慬敹 ? 牡 ? 汩畬瑳慲整 ? 祳瑳浥瑡捩污祬 ? 瑡琠敨猠浡 ? 楴敭 ?? 潣牲獥潰摮湩 ? 潳畬楴湯 ? 潦 ? 慭祮搠晩楦畣瑬琠' 虦嫖蹫 u 潲汢浥 ? ?档愠 ? 慰慲汬汥焠敵祲瀠潲散獳湩 ? 景洠汵楴搭浩湥楳湯污 ? 灳瑡潩整灭牯污椠普牯慭楴湯 ? 慤慴猠楬散猠潴慲敧 ? 潳瑦慷敲猠牥楶散映潬 ? 畣瑳浯穩瑡潩 ? 愠慮祬楳? 爠潥杲湡穩瑡潩 ? 湡 ? 潳漠吗？

英文摘要：

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.