210Po, 210Pb, and 234Th accounted for largefractions of the total phases. The abnormally high concentrations of dissolved 210Pb were observed. Partitionbehaviors of these radionuclides were influenced by particle content effect and particle composition based ondistribution coefficient (Kd) vs. total suspended matter (TSM) content and Kd vs. ratios of particulate organiccarbon and total suspended matter contents (POC/TSM content ratios). The peaks of mass specific activities of210Po, 210Pb, and 234Th indicated that degraded particles could have an intensified enrichment ability forradionuclides compared with the surficial suspended matters. Fractionation factor of 210Po and 210Pb (FPo/Pb) (>1)and fractionation factor of 210Po and 234Th (FPo/Th) (>1) were much higher at algal blooming regions than that atnon-blooming stations, indicating that algal blooms promoted the fractionation of 210Po against 210Pb and 234Th,and proving that 210Po exhibited a stronger affinity for biogenic particles than 210Pb and 234Th when POC contentincreased in the sea. POC/210Po, POC/210Pb and POC/234Th ratios (content/activity ratios) sharply decreased withdepth in both algal bloom and non-bloom stations. The outbreak of algal bloom promoted the complexity ofsuspended particles and increased the variability of POC/tracer ratios (content/activity ratios) in the differentdepth of the shallow seas. More considerations should be taken to the difficulty of the selection of export interfaceand the suitable tracers when algal blooming occurs.

Qiangqiang Zhong;Linwei Li;Viena Puigcorbé;Dekun Huang;Tao Yu;Jinzhou Du

Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China;State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200241, China;School of Science, Centre for Marine Ecosystems Research, Edith Cowan University, Joondalup, Western Australia 6027, Australia

海洋学报（英文版）

[1]Qiangqiang Zhong;Linwei Li;Viena Puigcorbé;Dekun Huang;Tao Yu;Jinzhou Du-.Contrasting behaviors of 210Po, 210Pb and 234Th in the East China Sea during a severe red tide: Enhanced scavenging and promoted fractionation)[J].海洋学报（英文版）,2022(08):5-21,中插1

234Th,largefractions,Partitionbehaviors,ondistribution,organiccarbon,of210Po,forradionuclides,FPo,atnon,contentincreased,withdepth,ofsuspended,differentdepth,interfaceand

Contrasting,210Pb,East,China,Sea,during,severe,tide,Enhanced,scavenging,promoted,fractionation,accounted,total,phases,abnormally,concentrations,dissolved,were,observed,these,influenced,by,effect,composition,coefficient,Kd,TSM,ratios,particulate,contents,POC,peaks,mass,specific,activities,indicated,that,degraded,particles,could,have,intensified,enrichment,compared,surficial,matters,Fractionation,much,higher,algal,blooming,regions,than,stations,indicating,blooms,against,proving,exhibited,stronger,affinity,biogenic,when,activity,sharply,decreased,both,outbreak,complexity,variability,shallow,seas,More,considerations,should,taken,difficulty,selection,export,suitable,tracers,occurs

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