TY - JOUR
T1 - Radon traced seasonal variations of water mixing and accompanying nutrient and carbon transport in the Yellow-Bohai Sea
AU - Wang, Xiaoxiong
AU - Chen, Xiaogang
AU - Liu, Jianan
AU - Zhang, Fenfen
AU - Li, Linwei
AU - Du, Jinzhou
N1 - Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/8/25
Y1 - 2021/8/25
N2 - Radon (222Rn) is a natural radioactive tracer widely utilized to evaluate water exchange and mixing processes; however, minimal studies have investigated the 222Rn distribution in the Yellow-Bohai Sea (YBS) and its behavior is poorly understood. In this study, the seasonal distribution of 222Rn in the YBS was investigated. The results found that the 222Rn distribution in surface waters is significantly affected by rivers, while 222Rn activity in bottom waters is highly affected by submarine groundwater discharge. The eddy diffusivity and advection velocities of the YBS were obtained utilizing an improved 1D steady-state 222Rn diffusion-advection model. The average horizontal eddy diffusivities in the wet (August 2015) and dry (November 2014) seasons were 4.54 × 108 and 2.28 × 108 cm2 s−1 in dry season, respectively and the average vertical eddy diffusivity was 4.99 cm2 s−1. The dissolved inorganic nutrient (N, P, and Si) and dissolved inorganic carbon flux outputs from vertical eddy diffusion were determined to be 4.85, 0.29, 3.59, and 61.6 mmol m−2 d−1, respectively. These results demonstrate that eddy diffusion tracing in coastal ocean is conducive to interpreting water mixing processes and can be utilized to understand offshore nutrient and carbon transport better.
AB - Radon (222Rn) is a natural radioactive tracer widely utilized to evaluate water exchange and mixing processes; however, minimal studies have investigated the 222Rn distribution in the Yellow-Bohai Sea (YBS) and its behavior is poorly understood. In this study, the seasonal distribution of 222Rn in the YBS was investigated. The results found that the 222Rn distribution in surface waters is significantly affected by rivers, while 222Rn activity in bottom waters is highly affected by submarine groundwater discharge. The eddy diffusivity and advection velocities of the YBS were obtained utilizing an improved 1D steady-state 222Rn diffusion-advection model. The average horizontal eddy diffusivities in the wet (August 2015) and dry (November 2014) seasons were 4.54 × 108 and 2.28 × 108 cm2 s−1 in dry season, respectively and the average vertical eddy diffusivity was 4.99 cm2 s−1. The dissolved inorganic nutrient (N, P, and Si) and dissolved inorganic carbon flux outputs from vertical eddy diffusion were determined to be 4.85, 0.29, 3.59, and 61.6 mmol m−2 d−1, respectively. These results demonstrate that eddy diffusion tracing in coastal ocean is conducive to interpreting water mixing processes and can be utilized to understand offshore nutrient and carbon transport better.
KW - Diffusion coefficient
KW - Nutrients and dissolved inorganic carbon
KW - Radon
KW - Seasonal and spatial variation
KW - Water mixing
KW - Yellow-Bohai Sea
UR - https://www.scopus.com/pages/publications/85104753969
U2 - 10.1016/j.scitotenv.2021.147161
DO - 10.1016/j.scitotenv.2021.147161
M3 - 文章
C2 - 33905925
AN - SCOPUS:85104753969
SN - 0048-9697
VL - 784
JO - Science of the Total Environment
JF - Science of the Total Environment
M1 - 147161
ER -