Significance of nutrients in oxygen-depleted bottom waters via various origins on the mid-outer shelf of the East China Sea during summer

Liu, Qian; Zhang, Jing; He, Huijun; Ma, Li; Li, Huanxin; Zhu, Siteng; Matsuno, Takeshi

doi:10.1016/j.scitotenv.2022.154083

Cited by 10 publications

(30 citation statements)

References 73 publications

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“…This method includes all parameters available in the n‐dimensional parameter space (Tomczak & Large, 1989), which enables us to distinguish the isopycnal and diapycnal mixing despite the potentially large systematic and artificial errors (Poole & Tomczak, 1999). Recently, it has been gradually used to determine water mass transport pathways, mixing length scales, and mixture ratios in the marginal seas, for example, the ECS (Liu et al., 2022; Zhang, Liu, Zhang, et al., 2007; Zhong et al., 2022; Zhou et al., 2018).…”

Section: Methodsmentioning

confidence: 99%

Unraveling the Synoptic‐Scale Penetration of the Yellow Sea Coastal Water Into the Changjiang River Estuary

et al. 2022

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As one of the most important coastal currents in the Northeast Pacific marginal seas, the Yellow Sea Coastal Water (YSCW) plays an essential role in modulating regional ocean circulation and the transregional exchange of biogeochemical materials. However, the wintertime transport pattern of the YSCW and its interaction with the Changjiang River Estuary (CJE) are intensely debated. Herein, we used a combination method of Principal Component Analysis‐based cluster analysis and Optimum Multiparameter Analysis, together with remote sensing data, to investigate the classification, distributions, pathways and mixture ratios of various water masses off the CJE in winter. Results clearly suggest that in winter the YSCW can repeatedly penetrate to the CJE in response to northerly wind bursts, and flows southward around 10–30 m isobaths off the CJE, with its impact scope reaching as far as at least 29.5°N. Furthermore, we propose a refined circulation pattern that the YSCW flows southward along 20–30 m isobaths on the Changjiang Bank, and thereby feeds the synoptic‐scale YSCW penetration into the CJE. Crucially, this work also highlights that the combination methodologies in a mathematic framework is useful for unraveling an implicit synoptic‐scale water mass interaction in highly dynamic estuaries and shelf seas, and thus provides better insight to ecological and environmental variability.

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Section: Methodsmentioning

confidence: 99%

Unraveling the Synoptic‐Scale Penetration of the Yellow Sea Coastal Water Into the Changjiang River Estuary

et al. 2022

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“…where, DO s and DO represent the saturated oxygen concentration at the given pressure/depth and the observed oxygen concentration, respectively. Chlorophyll was measured using a HITACHI F-4700 fluorometer (Parsons et al, 1984;Li et al, 2022). Nitrate and nitrite concentrations were measured using an autoanalyzer (Seal analytical AA3) (Li et al, 2022).…”

Section: Sample Collection and Ancillary Datamentioning

confidence: 99%

“…Chlorophyll was measured using a HITACHI F-4700 fluorometer (Parsons et al, 1984;Li et al, 2022). Nitrate and nitrite concentrations were measured using an autoanalyzer (Seal analytical AA3) (Li et al, 2022).…”

Section: Sample Collection and Ancillary Datamentioning

confidence: 99%

“…Seawater samples were pre-concentrated with NOBIAS PA1 resin in a Class 1000 clean room and the REE concentrations were determined by inductively coupled plasma mass spectrometry (ICP-MS; Takata et al, 2009;Persson et al, 2011;Hatje et al, 2014;Liu et al, 2022). The results were corrected using a Lu (lutecium) internal standard.…”

Section: Rare Earth Element Analysismentioning

confidence: 99%

“…The REE anomaly (the anomaly refers to the deviation of the measured value of one element to the value predicted from two adjacent elements after normalization) in the Northwest Pacific was used to trace inputs from the Philippine Islands (Behrens et al, 2018a). In addition, heavy rare earth elements (HREEs; Gd, Td, Dy, Ho, Er, Tm, Yb, Lu), which generally behave conservatively, have been utilized to identify water mass mixing (Zhang et al, 2018;Garcia-Solsona et al, 2020;Liu et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

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Dissolved rare earth elements in the Northwest Pacific: Sources, water mass tracing, and cross‐shelf fluxes

Axiang

Zhang

et al. 2023

Front. Mar. Sci.

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In the Northwest Pacific, a key area for understanding the sources and transport of materials in the ocean, knowledge of the sources, transport, and biogeochemical cycling of trace elements is limited. Trace elements such as the rare earth elements (REEs) can trace the sources and transport of water masses. Here we present dissolved REE concentrations along a longitudinal transect (150 oE) from 13°N to 40°N in the Northwest Pacific (≤2000 m). We divided the transect into two subregions: a mixed water region (MWR; 37~40 °N, where the Oyashio and Kuroshio currents mix) and a subtropical region (13~34 °N). In the MWR, REEs were strongly positively correlated with apparent oxygen utilization in subsurface water (depth > the chlorophyll maximum layer, potential density <26.6 kg/m3), with about a 4-fold higher slope (0.15±0.06) than in the subtropical region in subsurface and intermediate waters (0.04±0.003, potential density <27.5 kg/m3). This suggests that REEs are released by organic matter remineralization at a higher efficiency in the MWR vs. in the subtropical region, which can be explained by different water masses and plankton community structures. In addition, we observed a lithogenic input signal of REEs from the Aleutian Islands based on the high La/Yb ratio (>0.35). This ratio was controlled by lateral transport and showed a good agreement with salinity, indicating that it is a useful tracer of low salinity water originating from the subarctic region. Furthermore, we estimated the cross-shelf fluxes of Nd in the Northwest Pacific. The estimated Nd fluxes from the Sea of Okhotsk, the Sea of Japan, the East China Sea, and the South China Sea into the Northwest Pacific were 29~32 t/y, 159~302 t/y, 142~616 t/y, and -298~34 t/y, respectively. This study highlights the importance of considering the cross-shelf REE fluxes in the Northwest Pacific when constructing the oceanic REE budgets.

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Nutrient dynamics and cross shelf transport in the East China Sea

Dong,

Liu,

Ren

et al. 2024

Acta Oceanol. Sin.

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Significance of nutrients in oxygen-depleted bottom waters via various origins on the mid-outer shelf of the East China Sea during summer

Cited by 10 publications

References 73 publications

Unraveling the Synoptic‐Scale Penetration of the Yellow Sea Coastal Water Into the Changjiang River Estuary

Unraveling the Synoptic‐Scale Penetration of the Yellow Sea Coastal Water Into the Changjiang River Estuary

Dissolved rare earth elements in the Northwest Pacific: Sources, water mass tracing, and cross‐shelf fluxes

Nutrient dynamics and cross shelf transport in the East China Sea

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