dc.contributor.author
Wang, Chenyu
dc.contributor.author
Blanckenburg, Friedhelm von
dc.contributor.author
Lian, Ergang
dc.contributor.author
Yang, Shouye
dc.contributor.author
Perez, Jeffrey Paulo H.
dc.contributor.author
Wittmann, Hella
dc.date.accessioned
2024-05-16T08:51:48Z
dc.date.available
2024-05-16T08:51:48Z
dc.identifier.uri
https://refubium.fu-berlin.de/handle/fub188/43584
dc.identifier.uri
http://dx.doi.org/10.17169/refubium-43300
dc.description.abstract
Estuarine processes are key in modulating the riverine input of particle-reactive trace elements to the ocean. An important, but still under-utilized member of these elements is beryllium-9 (9Be) that together with cosmogenic 10Be has been suggested to serve as a quantitative tracer of present and past continental weathering flux. This study investigates different pathways of terrigenous 9Be through coastal areas into the ocean, based on dissolved 9Be concentrations in surface and bottom waters together with corresponding particulate 9Be concentrations along the salinity gradient in the Changjiang Estuary. Dissolved 9Be in the Changjiang Estuary shows a non-conservative behavior: At low to mid-salinity where water is well-mixed, 9Be is removed from both surface and bottom waters at low salinity and then released back into the water column at mid-salinity. At high salinity where water is stratified, dissolved 9Be is removed from surface waters, but is released back into bottom waters.
In combination with hydrochemical (e.g., dissolved oxygen) and particulate 9Be data obtained from different extracted phases, we attribute the removal of dissolved 9Be at low salinity to salt-induced colloidal flocculation, whereas in surface waters at high salinity, we ascribe the removal to biological scavenging facilitated by phytoplankton blooms. The release of 9Be into mid- and high-salinity bottom waters is likely dominated by benthic processes, including porewater diffusion and/or submarine groundwater discharge. The contribution from desorption of 9Be from suspended particulate matter is negligible throughout the entire estuary. We propose that the release of 9Be through benthic processes potentially presents the most important contributor to the marine 9Be budget, where this benthic flux of 9Be is likely enhanced by hypoxic conditions in coastal bottom waters.
en
dc.format.extent
15 Seiten
dc.rights.uri
https://creativecommons.org/licenses/by/4.0/
dc.subject
Changjiang Estuary
en
dc.subject
Benthic flux
en
dc.subject.ddc
500 Naturwissenschaften und Mathematik::550 Geowissenschaften, Geologie::550 Geowissenschaften
dc.title
River-to-ocean pathways of beryllium-9 through estuaries
dc.type
Wissenschaftlicher Artikel
dcterms.bibliographicCitation.doi
10.1016/j.gca.2024.01.029
dcterms.bibliographicCitation.journaltitle
Geochimica et Cosmochimica Acta
dcterms.bibliographicCitation.pagestart
89
dcterms.bibliographicCitation.pageend
103
dcterms.bibliographicCitation.volume
370
dcterms.bibliographicCitation.url
https://doi.org/10.1016/j.gca.2024.01.029
refubium.affiliation
Geowissenschaften
refubium.affiliation.other
Institut für Geologische Wissenschaften / Fachrichtung Geochemie, Hydrogeologie, Mineralogie

refubium.resourceType.isindependentpub
no
dcterms.accessRights.openaire
open access
dcterms.isPartOf.eissn
1872-9533
refubium.resourceType.provider
WoS-Alert