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Featured researches published by Su Mei Liu.


Continental Shelf Research | 2003

Inventory of nutrient compounds in the Yellow Sea

Su Mei Liu; Jing Zhang; S.Z Chen; Hongtao Chen; G.H Hong; Hao Wei; Q.M Wu

Abstract Nutrient species were analyzed from samples collected in the Yellow Sea in May 1998, including NO3−, NO2−, NH4+, PO43−, SiO32−, dissolved organic nitrogen (DON), particulate nitrogen, dissolved organic phosphorus (DOP), particulate phosphorus, etc. The exchange fluxes of nutrients across the sediment/water interface were determined by incubation of sediment on board the ship. The concentrations of N, P and Si compounds were high in coastal areas of the Yellow Sea, reflecting the effects of the Changjiang effluent plume, surface runoff in the west and east coasts and the circulation in the Yellow Sea. The high proportions of DON and DOP should be considered in models of nutrients cycling, which could help to explain observations of nutrient limitation in ecosystems of the Yellow Sea. The vertical distribution of N, P and Si compounds in the water column showed stratification feature. Simple box model was used to estimate the water-mass balance and nutrient budgets for the Yellow Sea. The data suggested that water turn-over time is about 2.2 years. Nutrient budgets demonstrated that net sink of NO3−, NH4+ and SiO32− can be mainly from water column into bottom sediments and/or transform to other forms of nitrogen (e.g. particulate pool and gas species). A net source of PO43− is estimated to be 75% of inputs from external sources in the Yellow Sea.


Estuaries | 1997

Dynamics of Nutrient Elements in Three Estuaries of North China: The Luanhe, Shuangtaizihe, and Yalujiang

Jing Zhang; Zhi Gang Yu; Su Mei Liu; Hui Xu; Min Guang Liu

Concentrations of nutrients (NO3−, NO2−, NH4+, PO43−, and dissolved SiO2) were examined in three North China estuaries—the Luanhe, Shuangtaizihe, and Yalujiang. These riverine-estuarine systems provide distinct geographic and hydrodynamic conditions, that is, a shallow water zone embraced by shoals and sandbars (Luanhe), the confluence of two streams in the upper estuary with different water and sediment loads, and a turbidity maximum in the upper estuarine mixing zone (Yalujiang). Nutrient element concentrations in these rivers are high in comparison with large, less disturbed systems but similar to those from polluted and/or eutrophic European and North American rivers. This is attributed to intensive weathering and erosion and extensive use of chemical fertilizers. In the fresh-marine waters mixing zone, nutrient species can behave either conservatively or nonconservatively, or both. Wherever nonconservative behaviours of nutrient elements are observed, remobilization from solid phases is probably the predominant mechanism. The extrapolation of dilution curves to the fresh water end-members gives estimated riverine concentrations, which can be between two and ten times higher than those from field observations. Taking into account the high N:P ratios (102–104) from North China rivers and very low concentrations of nitrogen species in the Northwest Pacific coastal oceans (e.g., Yellow Sea), the estuaries in this study may act as regions in which production is limited by phosphorus to regions in which production is limited by nitrogen.


Marine Pollution Bulletin | 2010

Environmental change in Jiaozhou Bay recorded by nutrient components in sediments

Su Mei Liu; Bing De Zhu; Jing Zhang; Ying Wu; Guang Shan Liu; Bing Deng; Mei-Xun Zhao; Guanqun Liu; Jinzhou Du; Jing Ling Ren; Gui Ling Zhang

Inorganic or bulk organic chemical indicators, including organic carbon (OC), total nitrogen, organic nitrogen (ON), fixed ammonium (N(fix)), exchangeable ammonium, exchangeable nitrate, organic phosphorus (OP), inorganic phosphorus (IP), and biogenic silica (BSi), were examined in a 3-m core collected in Jiaozhou Bay (JZB) to decipher how the environment has changed during the preceding two centuries of increasing anthropogenic influence in this region. Concentrations of BSi, OC, and OP reveal overall increases to ca.30 cm ( approximately 1984), then decreased toward the surface, probably reflecting a decrease in the productivity of overlying waters since 1984. Aquaculture might play an important role in the decrease of nutrient elements in the upper layers recorded in sediments. The decreased molar BSi/OC ratios upcore may be due to a change in dominance from large- to small-sized diatoms, as shown in other research. However, the shift may also be related to changes from heavily-silicified to lightly-silicified diatoms or to non-siliceous forms such as dinoflagellates. ON concentrations increased towards the surface sediment, which is most likely consistent with the increase in fertilizer application and wastewater discharge. Concentrations of IP, total P, and N(fix) all decreased conspicuously upcore at 41 cm depth ( approximately 1977), and were largely consistent with the decrease in rainfall and freshwater discharge to JZB. Our data suggest that the environment has significantly changed since the 1980s. Anthropogenic activities in the watersheds may exert a substantial influence on carbon cycling processes in estuaries and potentially the coastal ocean.


Geochemistry Geophysics Geosystems | 2016

Geochemical behavior of dissolved manganese in the East China Sea: Seasonal variation, estuarine removal, and regeneration under suboxic conditions

Zhao–Wei Wang; Jing Ling Ren; Shuo Jiang; Su Mei Liu; Ji–Liang Xuan; Jing Zhang

To better understand the geochemical cycle of dissolved manganese (Mn) in the East China Sea (ECS), the distribution of dissolved Mn across the ECS was investigated during three field studies in 2011 (May, August, and November). The concentration of dissolved Mn decreased across the ECS with distance from the coast. Mn-rich ECS shelf waters could export to the Kuroshio Waters, and had the potential to influence the northwest Pacific Ocean as well as the Japan Sea. The Kuroshio Waters were devoid of dissolved Mn, so its incursion could be tracked as it entered the ECS continental shelf region (approximately 50 m isobath). Seasonal variations of dissolved Mn in the ECS were significant, with the highest concentrations occurring in summer. Dissolved Mn in the Changjiang Estuary was nonconservative, and significant quantities were removed by net sorption onto suspended particulate matter. A model describing the sorption processes was applied to data for the Changjiang Estuary. Regeneration of dissolved Mn took place in near-bottom waters of the suboxic zone in August 2011, following extensive consumption of oxygen. The benthic flux of dissolved Mn was estimated based on Mn concentrations in the overlying waters and the near-bottom waters. A preliminary box model was established to develop a dissolved Mn budget for the ECS. Based on the dissolved Mn content in the ECS and the total input flux, a residence time of 76–350 days for dissolved Mn in the ECS was inferred.


Environmental Monitoring and Assessment | 2018

Hypoxia and nutrient dynamics affected by marine aquaculture in a monsoon-regulated tropical coastal lagoon

Jing Zhang; Zhuo-Yi Zhu; Wen Yuan Mo; Su Mei Liu; Dao Ru Wang; Guosen Zhang

The Laoyehai (lagoon) is located at the east coast of Hainan Island in the South China Sea and has been subject to perturbations from human activities, notably marine aquaculture, and has eutrophic surface and hypoxic near-bottom waters. A lack of knowledge of hydrodynamic and biogeochemical processes is a challenge to the sustainable management of lagoon at the ecosystem level in science. Five field campaigns, including three during the southwest monsoon and two in the northeast monsoon periods, were carried out at the Laoyehai in 2008–2011. The aim of this study is to investigate the impacts of dynamic processes of hydrography and human activities on nutrient geochemistry and their relationships to the system eutrophication and hypoxia in the lagoon. In this coastal system, high levels of ammonium relative to nitrate are found, elevated phosphate skews the DIN/DIP relative to the Redfield ratio, and the dissolved silicate concentration is high because of submarine groundwater discharge. The organic fraction in the Laoyehai accounts for a large proportion of the total nutrients associated with the release of wastes from marine aquaculture. The hypoxia of near-bottom waters in the Laoyehai is created and maintained by heterotrophic processes that are fueled by organic matter, which are exacerbated by poor water exchange as a consequence of the geomorphology and weak tidal circulation.


Progress in Oceanography | 2005

Factors influencing nutrient dynamics in the eutrophic Jiaozhou Bay, North China

Su Mei Liu; Jing Zhang; Hong Tao Chen; Guosen Zhang


Estuarine Coastal and Shelf Science | 2004

Phosphorus cycling in sediments of the Bohai and Yellow Seas

Su Mei Liu; Jing Zhang; Daoji Li


Journal of Marine Systems | 2004

Dynamics of inorganic nutrient species in the Bohai seawaters

Jing Zhang; Zenghui Yu; Th. Raabe; Su Mei Liu; A. Starke; L Zou; H.W Gao; U. H. Brockmann


Estuarine Coastal and Shelf Science | 2011

Typhoon-induced precipitation impact on nutrient and suspended matter dynamics of a tropical estuary affected by human activities in Hainan, China

Lucia S. Herbeck; Daniela Unger; Uwe Krumme; Su Mei Liu; Tim C Jennerjahn


Marine Chemistry | 2011

The impact of anthropogenic activities on nutrient dynamics in the tropical Wenchanghe and Wenjiaohe Estuary and Lagoon system in East Hainan, China

Su Mei Liu; Rui Huan Li; Gui Ling Zhang; Dao Ru Wang; Jinzhou Du; Lucia S. Herbeck; Jing Zhang; Jing Ling Ren

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Jing Zhang

East China Normal University

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Jing Ling Ren

Ocean University of China

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Gui Ling Zhang

Ocean University of China

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Ying Wu

East China Normal University

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Guosen Zhang

East China Normal University

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Jinzhou Du

East China Normal University

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Daji Huang

State Oceanic Administration

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Tian Xiao

Chinese Academy of Sciences

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Guo-Ling Zhang

Ocean University of China

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Hao Wei

Ocean University of China

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