当前位置: X-MOL 学术Front. Marine Sci. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
210Po/210Pb disequilibria and its estimate of particulate organic carbon export around Prydz Bay, Antarctica
Frontiers in Marine Science ( IF 2.8 ) Pub Date : 2021-06-22 , DOI: 10.3389/fmars.2021.701014
Huina Hu , Xiao Liu , Chunyan Ren , Renming Jia , Yusheng Qiu , Minfang Zheng , Min Chen

Due to the remoteness and difficulty of sampling, the 210Po and 210Pb data are scarce in the Southern Ocean. Here, the activity concentrations of 210Po and 210Pb around Prydz Bay in austral summer were determined to understand their spatial variation and evaluate the dynamics of particle organic matter (POM). The activity concentrations of dissolved 210Po (D210Po) and 210Pb (D210Pb) range from 0.47 to 3.20 Bq•m-3 and from 1.15 to 2.97 Bq•m-3, respectively, with the lower values in the shelf. The particulate 210Po (P210Po) and 210Pb (P210Pb) are lower in the open ocean and increase to the coastal waters, among which the Circumpolar Deep Water (CDW) is the lowest. The activity concentration of total 210Pb (T210Pb) ranges from 1.26 Bq•m-3 to 3.16 Bq•m-3, with a higher value in CDW, which is ascribed to radiogenic production from 226Ra and subsequent lateral transport. Occasionally a high value of T210Po occurs in deep water (> 3.00 Bq•m-3), which may be caused by the remineralization of POM. The disequilibria between T210Po and T210Pb appears throughout the water column at most stations. The average T210Po/T210Pb)A.R. in the euphotic zone is 0.66, reflecting the effect of strong particle scavenging. There is a good positive correlation between the solid-liquid ratio of 210Po and POC, while 210Pb does not, indicating that particulate organic matter regulates the biogeochemical cycle of 210Po around Prydz Bay. Based on the 210Po/210Pb disequilibria, the export flux of POC in the water column is estimated to be 0.8–31.9 mmol•m-2•d-1, with the higher values in the shelf.

中文翻译:

南极普里兹湾周围 210Po/210Pb 不平衡及其对颗粒有机碳出口的估计

由于地处偏远,采样难度大,南大洋210Po和210Pb资料稀缺。在这里,确定了南方夏季普里兹湾周围 210Po 和 210Pb 的活动浓度,以了解它们的空间变化并评估颗粒有机物 (POM) 的动态。溶解态 210Po (D210Po) 和 210Pb (D210Pb) 的活度浓度范围分别为 0.47 至 3.20 Bq•m-3 和 1.15 至 2.97 Bq•m-3,在货架上的值较低。颗粒物210Po(P210Po)和210Pb(P210Pb)在公海中较低,向近海增加,其中环极深水(CDW)最低。总210Pb(T210Pb)的活度浓度范围为1.26 Bq•m-3~3.16 Bq•m-3,CDW值较高,这归因于 226Ra 的放射性产生和随后的横向传输。偶尔在深水(> 3.00 Bq•m-3)中出现T210Po的高值,这可能是由POM的再矿化引起的。T210Po 和 T210Pb 之间的不平衡出现在大多数站点的整个水体中。透光区平均T210Po/T210Pb)AR为0.66,反映了强粒子清除作用。210Po的固液比与POC之间存在良好的正相关关系,而210Pb则没有,表明颗粒有机物调控了普里兹湾周围210Po的生物地球化学循环。根据 210Po/210Pb 不平衡,水体中 POC 的输出通量估计为 0.8-31.9 mmol•m-2•d-1,其中陆架中的值较高。偶尔在深水(> 3.00 Bq•m-3)中出现T210Po的高值,这可能是由POM的再矿化引起的。T210Po 和 T210Pb 之间的不平衡出现在大多数站点的整个水体中。透光区平均T210Po/T210Pb)AR为0.66,反映了强粒子清除作用。210Po的固液比与POC之间存在良好的正相关关系,而210Pb则没有,表明颗粒有机物调控了普里兹湾周围210Po的生物地球化学循环。根据 210Po/210Pb 不平衡,水体中 POC 的输出通量估计为 0.8-31.9 mmol•m-2•d-1,其中陆架中的值较高。偶尔在深水(> 3.00 Bq•m-3)中出现T210Po的高值,这可能是由POM的再矿化引起的。T210Po 和 T210Pb 之间的不平衡出现在大多数站点的整个水体中。透光区平均T210Po/T210Pb)AR为0.66,反映了强粒子清除作用。210Po的固液比与POC之间存在良好的正相关关系,而210Pb则没有,表明颗粒有机物调节了普里兹湾周围210Po的生物地球化学循环。根据 210Po/210Pb 不平衡,水体中 POC 的输出通量估计为 0.8-31.9 mmol•m-2•d-1,其中陆架中的值较高。T210Po 和 T210Pb 之间的不平衡出现在大多数站点的整个水体中。透光区平均T210Po/T210Pb)AR为0.66,反映了强粒子清除作用。210Po的固液比与POC之间存在良好的正相关关系,而210Pb则没有,表明颗粒有机物调控了普里兹湾周围210Po的生物地球化学循环。根据 210Po/210Pb 不平衡,水体中 POC 的输出通量估计为 0.8-31.9 mmol•m-2•d-1,其中陆架中的值较高。T210Po 和 T210Pb 之间的不平衡出现在大多数站点的整个水体中。透光区平均T210Po/T210Pb)AR为0.66,反映了强粒子清除作用。210Po的固液比与POC之间存在良好的正相关关系,而210Pb则没有,表明颗粒有机物调控了普里兹湾周围210Po的生物地球化学循环。根据 210Po/210Pb 不平衡,水体中 POC 的输出通量估计为 0.8-31.9 mmol•m-2•d-1,其中陆架中的值较高。表明颗粒有机物调节了普里兹湾周围 210Po 的生物地球化学循环。根据 210Po/210Pb 不平衡,水体中 POC 的输出通量估计为 0.8-31.9 mmol•m-2•d-1,其中陆架中的值较高。表明颗粒有机物调节了普里兹湾周围 210Po 的生物地球化学循环。根据 210Po/210Pb 不平衡,水体中 POC 的输出通量估计为 0.8-31.9 mmol•m-2•d-1,其中陆架中的值较高。
更新日期:2021-06-22
down
wechat
bug