Submarine groundwater discharge (SGD) into the Yellow Sea revealed by 228Ra and 226Ra isotopes: Implications for global silicate fluxes

Guebuem Kim; Jae Woong Ryu; Han Soeb Yang; Seong Taek Yun

doi:10.1016/j.epsl.2005.06.011

Submarine groundwater discharge (SGD) into the Yellow Sea revealed by ²²⁸Ra and ²²⁶Ra isotopes: Implications for global silicate fluxes

Guebuem Kim, Jae Woong Ryu, Han Soeb Yang, Seong Taek Yun

Research output: Contribution to journal › Article › peer-review

213 Citations (Scopus)

Abstract

We estimated the magnitude of submarine groundwater discharge (SGD) into the Yellow Sea, which is one of the largest continental shelves in the world, using ²²⁶Ra and ²²⁸Ra isotopes. On the basis of ²²⁸Ra and ²²⁶Ra mass-balance models, we estimated the advective flux of ²²⁶Ra through SGD to be ∼270 × 10¹² dpm yr^-1 in the Yellow Sea. Using this ²²⁶Ra flux and the measured ²²⁶Ra activity in coastal groundwater, the submarine discharge of groundwater (mostly brackish groundwater) was calculated to be at least 40% of the river-water input (∼2.3 × 10¹¹ m³ yr^-1). Then, on the basis of the SGD and the concentration of Si in coastal groundwater, we estimated the flux of Si through SGD to be 20-100% of that associated with river discharge (∼23 × 10⁹ mol yr^-1). This large SGD is likely to be due to the high tidal range (up to 10 m) and the wide distribution of sandy sediments in the Yellow Sea, favorable for the recirculation of seawater through bottom sediments and rocks. This result from such a large area implies that the Si flux through SGD may be significant on a global scale.

Original language	English
Pages (from-to)	156-166
Number of pages	11
Journal	Earth and Planetary Science Letters
Volume	237
Issue number	1-2
DOIs	https://doi.org/10.1016/j.epsl.2005.06.011
Publication status	Published - 2005 Aug 30

Bibliographical note

Funding Information:
This research was partially supported by a Korea Research Foundation Grant (KRF-2001-015-HS0002). We thank S.J. Kim and D.W. Hwang who helped with sampling and analyses. We are grateful to two anonymous reviewers for providing insightful comments and suggestions that improved this manuscript.

Keywords

Ra
Ra
Si
Submarine groundwater discharge
Yellow Sea

ASJC Scopus subject areas

Geophysics
Geochemistry and Petrology
Earth and Planetary Sciences (miscellaneous)
Space and Planetary Science

Access to Document

10.1016/j.epsl.2005.06.011

Cite this

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title = "Submarine groundwater discharge (SGD) into the Yellow Sea revealed by 228Ra and 226Ra isotopes: Implications for global silicate fluxes",

abstract = "We estimated the magnitude of submarine groundwater discharge (SGD) into the Yellow Sea, which is one of the largest continental shelves in the world, using 226Ra and 228Ra isotopes. On the basis of 228Ra and 226Ra mass-balance models, we estimated the advective flux of 226Ra through SGD to be ∼270 × 1012 dpm yr-1 in the Yellow Sea. Using this 226Ra flux and the measured 226Ra activity in coastal groundwater, the submarine discharge of groundwater (mostly brackish groundwater) was calculated to be at least 40% of the river-water input (∼2.3 × 1011 m3 yr-1). Then, on the basis of the SGD and the concentration of Si in coastal groundwater, we estimated the flux of Si through SGD to be 20-100% of that associated with river discharge (∼23 × 109 mol yr-1). This large SGD is likely to be due to the high tidal range (up to 10 m) and the wide distribution of sandy sediments in the Yellow Sea, favorable for the recirculation of seawater through bottom sediments and rocks. This result from such a large area implies that the Si flux through SGD may be significant on a global scale.",

keywords = "Ra, Ra, Si, Submarine groundwater discharge, Yellow Sea",

author = "Guebuem Kim and Ryu, {Jae Woong} and Yang, {Han Soeb} and Yun, {Seong Taek}",

note = "Funding Information: This research was partially supported by a Korea Research Foundation Grant (KRF-2001-015-HS0002). We thank S.J. Kim and D.W. Hwang who helped with sampling and analyses. We are grateful to two anonymous reviewers for providing insightful comments and suggestions that improved this manuscript. ",

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T2 - Implications for global silicate fluxes

AU - Kim, Guebuem

AU - Ryu, Jae Woong

AU - Yang, Han Soeb

AU - Yun, Seong Taek

N1 - Funding Information: This research was partially supported by a Korea Research Foundation Grant (KRF-2001-015-HS0002). We thank S.J. Kim and D.W. Hwang who helped with sampling and analyses. We are grateful to two anonymous reviewers for providing insightful comments and suggestions that improved this manuscript.

PY - 2005/8/30

Y1 - 2005/8/30

N2 - We estimated the magnitude of submarine groundwater discharge (SGD) into the Yellow Sea, which is one of the largest continental shelves in the world, using 226Ra and 228Ra isotopes. On the basis of 228Ra and 226Ra mass-balance models, we estimated the advective flux of 226Ra through SGD to be ∼270 × 1012 dpm yr-1 in the Yellow Sea. Using this 226Ra flux and the measured 226Ra activity in coastal groundwater, the submarine discharge of groundwater (mostly brackish groundwater) was calculated to be at least 40% of the river-water input (∼2.3 × 1011 m3 yr-1). Then, on the basis of the SGD and the concentration of Si in coastal groundwater, we estimated the flux of Si through SGD to be 20-100% of that associated with river discharge (∼23 × 109 mol yr-1). This large SGD is likely to be due to the high tidal range (up to 10 m) and the wide distribution of sandy sediments in the Yellow Sea, favorable for the recirculation of seawater through bottom sediments and rocks. This result from such a large area implies that the Si flux through SGD may be significant on a global scale.

AB - We estimated the magnitude of submarine groundwater discharge (SGD) into the Yellow Sea, which is one of the largest continental shelves in the world, using 226Ra and 228Ra isotopes. On the basis of 228Ra and 226Ra mass-balance models, we estimated the advective flux of 226Ra through SGD to be ∼270 × 1012 dpm yr-1 in the Yellow Sea. Using this 226Ra flux and the measured 226Ra activity in coastal groundwater, the submarine discharge of groundwater (mostly brackish groundwater) was calculated to be at least 40% of the river-water input (∼2.3 × 1011 m3 yr-1). Then, on the basis of the SGD and the concentration of Si in coastal groundwater, we estimated the flux of Si through SGD to be 20-100% of that associated with river discharge (∼23 × 109 mol yr-1). This large SGD is likely to be due to the high tidal range (up to 10 m) and the wide distribution of sandy sediments in the Yellow Sea, favorable for the recirculation of seawater through bottom sediments and rocks. This result from such a large area implies that the Si flux through SGD may be significant on a global scale.

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