Determination of transport rates in the Yellow River-Bohai Sea mixing zone via natural geochemical tracers

Peterson, W.C.and Taniguchi and Misra, S. (2008) Determination of transport rates in the Yellow River-Bohai Sea mixing zone via natural geochemical tracers. Continental Shelf Research, 28 (19). pp. 2700-2707. DOI 10.1016/j.csr.2008.09.002

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Official URL: http://dx.doi.org/10.1016/j.csr.2008.09.002

Abstract

In light of the current problems facing the Yellow River and surrounding areas (e.g., periods of zero river discharge, increasing nitrate concentrations of the Bohai Sea), we examined the coastal mixing dynamics around the mouth of the Yellow River. Naturally occurring radium isotopes (223Ra, 224Ra, 226Ra, and 228Ra) and other geochemical tracers (Ba, Si, and salinity) were employed to determine river plume transport scales and rates. Barium and radium exhibit elevated concentrations within the salinity gradient where they are desorbed from particles via ion-exchange. Once they are added to the system, they decrease offshore from dilution with lower concentration Bohai Sea water, and in the case of 224Ra and 223Ra, by radioactive decay. Using radium “ages” to assess the dissolved material transport scales and rates proved to be a useful tool in this environment. The ages based on the 224Ra/228Ra activity ratio increased gradually until salinities reached ∼25 when they rapidly increased due to decreased mixing at higher salinities. Integrated net transport rates through the salinity front ranged from 1.4 to 1.6 cm/s and did not vary significantly with river discharge. Thus, tidal mixing appears to dominate in this system, at least over the range of discharges investigated (80–600 m3/s). Determining the temporal scale of flow across the coastal zone in this region is a valuable first step toward examining whether the Yellow River is contributing to the increasing inorganic nitrogen concentrations in the central Bohai Sea.

Item Type: Article
Uncontrolled Keywords: NIL Arep;
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Journal or Publication Title: Continental Shelf Research
Volume: 28
Page Range: pp. 2700-2707
Identification Number: 10.1016/j.csr.2008.09.002
Depositing User: Sarah Humbert
Date Deposited: 15 May 2014 17:21
Last Modified: 15 May 2014 17:21
URI: http://eprints.esc.cam.ac.uk/id/eprint/3048

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