2017
DOI: 10.1002/2017gc006899
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Utilizing 210Po deficit to constrain particle dynamics in mesopelagic water, western South China Sea

Abstract: The 210Po‐210Pb pair is increasingly used as a proxy of quantifying organic carbon export from the euphotic zone. However, disequilibria between 210Po and 210Pb in mesopelagic water have been poorly studied. Here we present unusual deficiencies of 210Po with respect to 210Pb in mesopelagic water (200–1000 m) in the South China Sea (SCS). The total particulate matter (TPM) increased by up to 32% in the mesopelagic layer comparing with the euphotic zone. The total 210Po/210Pb ratio varied from 0.41 to 0.98 with … Show more

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Cited by 25 publications
(58 citation statements)
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“…This variation is possibly due to different flux rates and lability of sinking particles between the two regions. Compared to the WPS, SCS has greater primary production, downward and lateral fluxes of particle organic matter (POM) facilitated by the shift of monsoon strength, and frequent occurrence of strong internal waves in the SCS (Alford et al, ; Hung et al, ; Ma et al, ). Therefore, the higher concentration and larger contribution of recently produced POM to the middle water of SCS may have led to greater remineralization and concomitant production of humic‐like FDOM, reducing the M:C value compared to the WPS (Figure ).…”
Section: Discussionmentioning
confidence: 99%
“…This variation is possibly due to different flux rates and lability of sinking particles between the two regions. Compared to the WPS, SCS has greater primary production, downward and lateral fluxes of particle organic matter (POM) facilitated by the shift of monsoon strength, and frequent occurrence of strong internal waves in the SCS (Alford et al, ; Hung et al, ; Ma et al, ). Therefore, the higher concentration and larger contribution of recently produced POM to the middle water of SCS may have led to greater remineralization and concomitant production of humic‐like FDOM, reducing the M:C value compared to the WPS (Figure ).…”
Section: Discussionmentioning
confidence: 99%
“…Photodegradation (Stubbins, Niggemann, & Dittmar, ; Ward et al, ) and incorporation of DBC to sinking particle in particle‐abundant seas (Fang et al, ) have been thought to be responsible for the DBC leaving behavior within the euphotic zone. Suspended particulate matter (SPM) in the euphotic zone is usually low in the western SCS (0.35 mg L −1 ; Ma et al, ). In contrast, the SPM concentrations averaged 0.58 mg L −1 on the Chukchi and Bering Shelves (Fang et al, ), which was much higher than the SCS.…”
Section: Discussionmentioning
confidence: 99%
“…In addition, for analysis of particulate PAHs, 20 L of seawater samples were collected in the upper 0–30 m water column at stations BL13, BL16, and BM06, and 10 L seawater samples were collected for analysis of 210 Po and 210 Pb in the upper 0–30 m water column at stations BL13 and BL16. The sampling volumes are same as those given in our previous studies (Cai et al., 2016; Hu et al., 2014; Ke et al., 2017; M. Liu, Hu, et al., 2021; Ma et al., 2017). Details of the stations and sampling depth are shown in the Supporting Information in Table .…”
Section: Methodsmentioning
confidence: 99%
“…Besides the pair of 238 U/ 234 Th, the pair of 210 Pb/ 210 Po are also particle reactive and have quick sorption and sinking in seawater (Bacon et al., 1976; He et al., 2015). 210 Po (T 1/2 = 138.4 d), mainly produced from the decay of its grandparent 210 Pb (T 1/2 = 22.3 a), is easier to be absorbed onto biogenic particles than 210 Pb, hence deficient to its grandparent due to the insufficient accumulation time (Ma et al., 2017; Yang et al., 2015). Regarding their different biogeochemical behavior and particle affinity, 210 Po is regarded as a better tracer for biogenic particles, while 234 Th is more suitable for the total mass (Stewart et al., 2007; Verdeny et al., 2009; Yang et al., 2009).…”
Section: Introductionmentioning
confidence: 99%