Sinking of particulates ^(234)Th_(xs),~7Be and ^(210)Pb_(xs) in the Changjiang estuary,China  

Sinking of particulates ^(234)Th_(xs),~7Be and ^(210)Pb_(xs) in the Changjiang estuary,China

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作  者:黄德坤 杜金洲 吴云峰 李道季 张经 

机构地区:[1]State Key Laboratory of Estuarine and Coastal Research,East China Normal University

出  处:《Chinese Journal of Oceanology and Limnology》2010年第6期1152-1159,共8页中国海洋湖沼学报(英文版)

基  金:Supported by the National Natural Science Foundation of China (No.40976054);the State Key Laboratory of Estuarine and Coastal Research of China (No. 2008KYYW08);the National Basic Research Program of China (973 Program) (Nos. 2002CB412405 and 2006CB400601)

摘  要:The time scale of transport and reaction processes in the ocean can be evaluated using natural radionuclides of different half-lives.In the present study,we evaluated the residence times of particulate reactive radionuclides 7 Be,210 Pb xs and 234 Th in the Changjiang (Yangtze River) estuary,which is a high turbidity estuary,in June,2006.The residence times of particulate 7 Be,234 Th xs and 210 Pb xs in the Changjiang estuary were calculated to be 0.7-20.4,0.18-4.1 and 0.6-89.8 d,respectively.The obtained residence times of those nuclides are comparable with those of other estuaries and bays.For 234 Th xs and 7 Be,the residence times decreased with increasing concentrations of suspended particulate matter (SPM);however,those of 210 Pb xs increased.Moreover,scavenging residence times of 234 Th and 7 Be increased from coast to offshore,while those of 210 Pb xs decreased.The time scale of transport and reaction processes in the ocean can be evaluated using natural radionuclides of different half-lives. In the present study, we evaluated the residence times of particulate reactive radionuclides 7Be, 210Pbxs and 234Th in the Changjiang (Yangtze River) estuary, which is a high turbidity estuary, in June, 2006. The residence times of particulate 7Be, 234Thxs and 210Pbxs in the Changjiang estuary were calculated to be 0.7-20.4, 0.184.1 and 0.6-89.8 d, respectively. The obtained residence times of those nuclides are comparable with those of other estuaries and bays. For 234Thxs and 7Be, the residence times decreased with increasing concentrations of suspended particulate matter (SPM); however, those of 210Pbxs increased. Moreover, scavenging residence times of 234Th and 7Be increased from coast to offshore, while those of 210pbxs decreased.

关 键 词:thorium-234 beryllium-7 lead-210 residence times Changjiang (Yangtze River) estuary 

分 类 号:P734.24[天文地球—海洋化学]

 

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