Factors regulating the concentration of particulate iodine in coastal seawater

Satoh, Yuhi; Otosaka, Shigeyoshi; Suzuki, Takashi; Nakanishi, Takahiro

doi:10.1002/lno.12369

Cited by 6 publications

(10 citation statements)

References 52 publications

(89 reference statements)

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“…The iodine content of the plankton biomass can be estimated from the carbon to iodine ratio of 1:1×10 -4 (Elderfield and Truesdale, 1980) and the inner shelf biomass (mg C m -3 , Section 2.2.2). Our estimate of pI Bio ranged from 0.004 to 0.096 nM, this is 1000× lower than dI T and 10× lower than the expected pI T (Wong et al, 1976;Satoh et al, 2023). Therefore, pI Bio is only a small portion of pI T and unlikely to be the missing pool of iodine.…”

Section: Biological Particulate Iodinementioning

confidence: 55%

“…This is important because upper sediment pore water dI T concentrations of the lower Tamar River estuary are generally between 2-5 mM (Upstill-Goddard and Elderfield, 1988) so at low river flow they may be a source of iodine as iodide but not iodate. Conversely, sediment entrapment to the water column that increases suspended load may decrease soluble iodine concentration (Truesdale, 1994;Truesdale and Upstill-Goddard, 2003;Satoh et al, 2019a;Satoh et al, 2023). The low relative mean contribution of I* (3 nM) and the relative consistency of dI T (399 ± 30 nM) indicates that seawater successfully subsumes seawater margin processed dI T contributions.…”

Section: Iodine Dynamics In a Terrestrially Influenced Inner Shelf Se...mentioning

confidence: 99%

“…possibility that the missing iodine is in the particulate phase. The concentration of total particulate iodine (pI T ) in the coastal Pacific and open Atlantic Ocean surface seawaters is ~1 nM (Wong et al, 1976;Satoh et al, 2023). The low pI T concentration suggests that pI T cannot account for the tens of nanomolar dI T inner shelf missing pool of iodine.…”

Section: Biological Particulate Iodinementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Relative to open ocean and outer shelf waters, the concentration of dissolved iodine in coastal inner shelf waters is lower (Truesdale, 1978;Truesdale, 1994;Truesdale and Upstill-Goddard, 2003;Satoh et al, 2019a;Satoh et al, 2023;Shi et al, 2023). The reason for this is not well known (Chance et al, 2014), though a chemical transformation to a particulate fraction may account for the apparent depreciated soluble iodine concentrations (Truesdale, 1994;Truesdale and Upstill-Goddard, 2003;Satoh et al, 2019a;Satoh et al, 2023). Processes directly influencing the iodine cycle in wider coastal environments include interaction with dissolved organic material during its remineralization and sorption to particulate material (Truesdale, 1978;Tian et al, 1996;Satoh et al, 2019a;Shi et al, 2023), the mixing of deeper low oxygen high iodide waters to the surface (Shi et al, 2023), and significant changes in dissolved organic iodine (DOI) concentration (DDOI up to 100 nM; Satoh et al, 2019a).…”

Section: Introductionmentioning

confidence: 99%

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Iodide, iodate & dissolved organic iodine in the temperate coastal ocean

Jones,

Chance,

Bell

et al. 2024

Front. Mar. Sci.

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The surface ocean is the main source of iodine to the atmosphere, where it plays a crucial role including in the catalytic removal of tropospheric ozone. The availability of surface oceanic iodine is governed by its biogeochemical cycling, the controls of which are poorly constrained. Here we show a near two-year time series of the primary iodine species, iodide, iodate and dissolved organic iodine (DOI) in inner shelf marine surface waters of the Western English Channel (UK). The median ± standard deviation concentrations between November 2019 and September 2021 (n=76) were: iodide 88 ± 17 nM (range 61-149 nM), iodate 293 ± 28 nM (198-382 nM), DOI 16 ± 16 nM (<0.12-75 nM) and total dissolved iodine (dIT) 399 ± 30 nM (314-477 nM). Though lower than inorganic iodine ion concentrations, DOI was a persistent and non-negligible component of dIT, which is consistent with previous studies in coastal waters. Over the time series, dIT was not conserved and the missing pool of iodine accounted for ~6% of the observed concentration suggesting complex mechanisms governing dIT removal and renewal. The contribution of excess iodine (I*) sourced from the coastal margin towards dIT was generally low (3 ± 29 nM) but exceptional events influenced dIT concentrations by up to ±100 nM. The seasonal variability in iodine speciation was asynchronous with the observed phytoplankton primary productivity. Nevertheless, iodate reduction began as light levels and then biomass increased in spring and iodide attained its peak concentration in mid to late autumn during post-bloom conditions. Dissolved organic iodine was present, but variable, throughout the year. During winter, iodate concentrations increased due to the advection of North Atlantic surface waters. The timing of changes in iodine speciation and the magnitude of I* subsumed by seawater processes supports the paradigm that transformations between iodine species are biologically mediated, though not directly linked.

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Section: Biological Particulate Iodinementioning

confidence: 55%