首页|Particle dynamics revealed by 210Po/210Pb disequilibria around Prydz Bay, the Southern Ocean in summer

Particle dynamics revealed by 210Po/210Pb disequilibria around Prydz Bay, the Southern Ocean in summer

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Seawater samples were collected around Prydz Bay in summer of 2014, dissolved and particulate 210Po and 210Pb were measured to reveal the disequilibrium characteristics and particle dynamics. Our results show that the distribution of 210Po and 210Po/210Pb activity ratio in the upper water is mainly affected by biological absorption or particle adsorption. An abnormal excess of 210Po relative to 210Pb was observed in the surface water at stations P1-2 and P2-2, which is likely to be the horizontal transport of water mass with high DPo/DPb)A.R. and TPo/TPb)A.R.. In this study, the removal of particulate 210Po is mainly controlled by the scavenging of dissolved 210Po and the two have a linear positive correlation with the salinity, a negative linear correlation with the content of dissolved oxygen and a reciprocal relationship with the content of POC. The export flux of POC at 100 m is estimated to be 1.8–4.4 mmol·m−2·d−1 (avg. 2.9 mmol·m−2·d−1) based on 210Po/210Pb disequilibria, with the highest value in the shelf, which is consistent with the distribution of biological productivity.

210Po/210Pb disequilibria210Po excessparticle dynamicsPOC exportPrydz Bay

CHEN Mengya、CHEN Min、ZHENG Minfang、QIU Yusheng、ZHU Jing、QIAN Qiankun

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College of Ocean and Earth Sciences,Xiamen University,Xiamen 361102,China

National Polar Special ProgramNational Polar Special ProgramNational Natural Science Foundation of ChinaChina Ocean Mineral Resources R&D Association

IRASCC 01-01-02C02-01-01Grant 41721005Grant DY135-13-E2-03

2022

10.13679/j.advps.2021.0045

极地科学进展(英文版)
中国极地研究中心,国家海洋局极地考察办公室 (Polar Research Institute of China, Chinese Arctic and Antarctic Administration)

极地科学进展(英文版)

CSCD
影响因子：0.145
ISSN：1674-9928
年,卷(期)：2022.33(1)
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