| Zhang Lihao,Yang Weifeng,Chen Min,Zhu Yinian,Wang Zhou,Fang Ziming,Qiu Yusheng,Li Yanhong.Distribution patterns of 210Po, 210Pb and the particle export in the Taiwan Strait during the winter[J].Acta Oceanologica Sinica,2020,39(2):12-21 |
| 冬季台湾海峡210Po和210Pb的分布特征及颗粒物的输出 |
| Distribution patterns of 210Po, 210Pb and the particle export in the Taiwan Strait during the winter |
| 投稿时间：2018-11-05 |
| DOI：10.1007/s13131-020-1550-z |
| 中文关键词: 台湾海峡 210Po 210Pb 再悬浮 输出通量 沉积 |
| 英文关键词:Taiwan Strait 210Po 210Pb resuspension export flux sedimentation |
| 基金项目:The National Natural Science Foundation of China under contract Nos 41076043 and 51608142; the Guangxi Young and Middle-aged Teachers' Basic Ability Upgrading Project under contract No. 2019KY0298; the Guangxi Science and Technology Planning Project under contract No. GuiKe-AD18126018. |
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| 中文摘要: |
| 近年来，210Po和210Pb被用于示踪开阔大洋颗粒动力学，但在近岸应用尚很少。本文探究了冬季台湾海峡210Po和210Pb的分布特征，并应用其示踪了颗粒物沉降。溶解态210Po和210Pb（<0.6 μm）的比活度分别为1.21-7.63 dpm/100L和1.07-6.33 dpm/100L。颗粒态210Po和210Pb（<0.6 μm）的比活度分别为1.96-36.74 dpm/100L和3.11-38.06 dpm/100L。总体上，颗粒态是210Po和210Pb的主要存在相态。溶解态和颗粒态210Po均与210Pb呈现相同的空间分布特征，表明调控两核素分布的机制相似。固-液分配系数揭示了浙闽沿岸流中颗粒物与210Po的亲和力更强，而台湾暖流中颗粒物则优先吸附210Pb。基于210Po-210Pb不平衡计算的颗粒物沉降通量介于-0.22 g/（m2·d）-3.84 g/（m2·d）之间，其空间特征与之前报道的台湾海峡沉积速率空间格局一致。但是，颗粒物沉降通量低于沉积速率，揭示了冬季台湾海峡可能存在沉积物再悬浮后向东海陆架输送的过程。 |
| 英文摘要: |
| 210Po and 210Pb are increasingly used to constrain particle dynamics in the open oceans, however they are less used in coastal waters. Here, distributions and partitions of 210Po and 210Pb were examined in the Taiwan Strait, as well as their application to quantify particle sinking. Activity concentrations of dissolved 210Po and 210Pb (<0.6 μm) ranged from 1.21 to 7.63 dpm/(100 L) and from 1.07 to 6.33 dpm/(100 L), respectively. Activity concentrations of particulate 210Po and 210Pb varied from 1.96 to 36.74 dpm/(100 L) and from 3.11 to 38.06 dpm/(100 L). Overall, particulate 210Po and 210Pb accounted for the majority of the bulk 210Po and 210Pb. 210Po either in dissolved or particulate phases showed similar spatial patterns to 210Pb, indicating similar mechanisms for controlling the distributions of 210Po and 210Pb in the Taiwan Strait. The different fractionation coefficients indicated that particles in the Zhemin Coastal Current (ZCC) inclined to absorb 210Po prior to 210Pb while they showed an opposite effect in the Taiwan Warm Current (TWC). Based on the disequilibria between 210Po and 210Pb, the sinking fluxes of total particulate matter (TPM) were estimated to range from -0.22 to 3.84 g/(m2·d), showing an overall comparable spatial distribution to previous reported sediment accumulation rates. However, our sinking fluxes were lower than the sedimentation rates, indicating a sediment resuspension in winter and horizontal transport of particulate matter from the Taiwan Strait to the East China Sea. |
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