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| 1 | Review and suggestions for estimating particulate organic carbon and dissolved organic carbon inventories in the ocean using remote sensing data显示文摘Dissolved organic carbon(DOC)and particulate organic carbon(POC)are basic variables for the ocean carbon cycle.Knowledge of the distribution and inventory of these variables is important for a better estimation and understanding of the global carbon cycle.Owing to its considerable advantages in spatial and temporal coverage,remote sensing data provide estimates of DOC and POC inventories,which are able to give a synthetic view for the distribution and transportation of carbon pools.To estimate organic carbon inventories using remote sensing involves integration of the surface concentration and vertical profile models,and the development of these models is critical to the accuracy of estimates.Hence,the distribution and control factors of DOC and POC in the ocean first are briefly summarized,and then studies of DOC and POC inventories and flux estimations are reviewed,most of which are based on field data and few of which consider the vertical distributions of POC or DOC.There is some research on the estimation of POC inventory by remote sensing,mainly in the open ocean,in which three kinds of vertical profile models have been proposed:the uniform,exponential decay,and Gauss models.However,research on remote-sensing estimation of the DOC inventory remains lacking.A synthetic review of approaches used to estimate the organic carbon inventories is offered and the future development of methods is discussed for such estimates using remote sensing data in coastal waters. | PAN Delu LIU Qiong BAI Yan | 2014 | Acta Oceanologica Sinica2014，33，1： | 2 |
| 2 | 黑潮区颗粒有机碳和生物硅输出的^(234)Th/^(238)U不平衡示踪显示文摘对东海陆架外黑潮区颗粒有机碳(POC)和生物硅(bSiO2)的研究表明:台湾东北部黑潮主流真光层(100 m)POC和bSiO2的平均浓度分别为3.31μmol/L和0.68μmol/L;234Th/238U不平衡法获得POC和bSiO2的输出通量分别为3.7 mmol/(m2·d)和1.6 mmol/(m2·d).黑潮沿东海陆架北进过程中,POC和bSiO2的含量及输出通量均呈增加趋势.位于日本西南的黑潮主流中,POC和bSiO2的平均浓度分别为3.85μmol/L和2.63μmol/L,输出通量分别为6.7 mmol/(m2·d)和4.0 mmol/(m2·d).黑潮与陆架水形成的锋面区,POC和bSiO2浓度均高于黑潮主流. | 王宙 杨伟锋 陈敏 郑敏芳 张馨星 童金炉 邱雨生 | 2013 | 郑州大学学报(理学版)2013，45，4： | 0 |
| 3 | Seasonal export fluxes of size-fractionated particulate derived from polonium-210: A case study in Xiamen Bay显示文摘Size-fractionated 210Po and 210Pb, in the size fractions >0.4 μm, >2 μm and >10 μm, were examined to determine the seasonal variability of particulate fluxes in Xiamen Bay. Good correlations between 210Po and particulate organic carbon (POC) or non-Particulate Organic Matter (nPOM) suggested that 210Po can be used to trace the export fluxes of POC and nPOM. Both steady-state (SS) model and nSS model were used to evaluate fluxes of size-fractionated 210Po, results showed that nSS model was better than the SS model in coastal areas. Based on the nSS model, size-fractionated POC fluxes decreased with increasing particle size. For the particle size studied, maximum POC fluxes occurred in autumn, followed by spring, winter, and summer. Fluxes of nPOM were an order of magnitude higher than the corresponding size-fractionated POC fluxes. Differences between size-fractionated nPOM fluxes indicated that hydrodynamic conditions were the main factor regulating transportation of particulate out of the inner Bay. In winter most particulates, including >10 μm particles, were transported under the strongest hydrodynamic conditions. In contrast, only a fraction of the <2 μm particulates were transported from the inner Bay in spring. This study suggested that 210Po is a powerful tracer of seasonal particulate export in coastal seas. | 杨伟锋 黄奕普 陈敏 邱雨生 | 2010 | Chinese Journal of Oceanology and Limnology2010，28，2： | 0 |
| 4 | Utilizing ^(234)Th/^(238)U disequilibrium to constrain particle dynamics in hydrothermal plumes in the Southwest Indian Ocean显示文摘Metal-enriched minerals have been widely observed near hydrothermal vent fields.However,the dynamics of particulate metals influenced by hydrothermal activities is poorly constrained.Here,radioactive 234Th in both dissolved and particulate phases were used to examine the kinetics of particle-reactive metal adsorption,removal,and residence in a newly found hydrothermal plume over the Southwest Indian Ridge.The results showed a relatively low value on ^(234)Th/^(238)U ratios(i.e.,0.73-0.88)compared to the deep oceans,indicating an enhanced adsorption of particle-reactive metals onto particulate matter in the plume.Based on the 234Th-238U disequilibria,the adsorption and sinking rate constants of 234Th averaged(0.009±0.001)d^(-1) and(0.113±0.024)d^(-1) in the hydrothermal plume,corresponding to the residence times of(115±19)d and(16±5)d for dissolved and particulate 234Th,respectively.This timescale allows vent-discharged particle-reactive metals to disperse hundreds to thousands of miles away.Thus,hydrothermal activities might influence the metal distribution in deep ocean over a very large scope.Also,a high sinking flux of(36.2±5.4)B q/(m^(2)·d)for 234Th was observed for the plume,suggesting an enrichment of metal in particles deposited close to the vent.The enhancement of particle sinking could also benefit the transport of organic carbon and nitrogen and fuel the benthic ecosystems under the plume regimes.Thus,hydrothermal plumes may have an impact on both the elemental geochemistry and/or ecosystem to the deep oceans interior than previous expectation. | Weifeng Yang Xinxing Zhang Min Chen Ziming Fang Yusheng Qiu | 2021 | Acta Oceanologica Sinica2021，40，6： | 0 |
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