Bio: Shumin Lian is an academic researcher from Chinese Academy of Sciences. The author has contributed to research in topics: Monsoon & Upwelling. The author has an hindex of 5, co-authored 7 publications receiving 124 citations.
TL;DR: Based on the high-resolution in situ and remote sensing data, this paper examined in details the spatial patterns of phytoplankton biomass and primary production in the coast of NWSCS in summer and discussed the underline physical processes involved.
TL;DR: In this article, the distribution and abundance of thaliaceans were studied in relation to physical and biological variables during summer and winter in the northwest continental shelf of South China Sea.
15 Sep 2011
TL;DR: In this article, the authors studied the effect of monsoon, coastal current and temperature on the distribution and seasonal variations of Calanus sinicus abundance and found that the abundance of C sinicus varied seasonally and regionally.
Abstract: The effect of monsoon, coastal current and temperature on the distribution and seasonal variations of Calanus sinicus abundance were studied. The samples from the northwest continental shelf of South China Sea were collected with 505 mu m planktonic nets from July 2006 to October 2007. The abundance of C sinicus made up 34.28% and 12.34% of all copepods in spring and summer, respectively. The distribution of C. sinicus varied seasonally and regionally. The distribution of C. sinicus ranged between east inshore and offshore waters from the Leizhou Peninsula to Hainan Island, with a mean of 23.00 (+/- 77.78) ind. m(-3) in spring. In summer it had a mean of 13.74 (+/- 45.10) ind. m(-3) occurring only in the east inshore waters from Leizhou Peninsula to Hainan Island. C. sinicus was not abundant during autumn and winter seasons. The surveyed area was divided into three sub-regions based on topographical analysis and water mass, region I (included the east inshore waters of Leizhou Peninsula), region II (included the east inshore waters of Hainan Island) and region III (included the offshore waters from Leizhou Peninsula to Hainan Island). The average abundance of C. sinicus within region I was determined to be 115.63 (+/- 145.93) and 68.12 (+/- 84.00) ind. m(-3) in spring and summer, respectively, values higher than those of regions II and III. Our findings suggested that C. sinicus was transported from the East China Sea to the northwest continental shelf of South China Sea by the Guangdong Coastal Current, which was driven by the northeast monsoon in spring. The presence of a cold eddy, in addition to coastal upwelling driven by the southwest monsoon, provided suitable survival conditions for C. sinicus in summer. This species disappeared in autumn due to high temperatures (> 27 degrees C) and did not begin to enter into the northwest continental shelf of South China Sea from the East China Sea during the period of investigation in winter. The frequency of C sinicus was low in region III during the year as a result of the South China Sea Warm Current and pelagic waters with high temperature during the spring and summer months. Crown Copyright (C) 2011 Published by Elsevier Ltd. All rights reserved.
TL;DR: In this paper, the horizontal distribution of phytoplankton abundance, species composition, and environmental factors were investigated in the surface waters of southern South China Sea (SCS) in early summer (May 16 to June 7) of 2009.
Abstract: Horizontal distributions of phytoplankton abundance, species composition as well as environmental factors were investigated in the surface waters of southern South China Sea (SCS) in early summer (May 16 to June 7) of 2009. In most areas of southern SCS, the concentrations of nitrogen and phosphorus were very low and DIN/DIP ratios usually were lower than the Redfield N/P Ratio of 16:1. Nitrogen nutrients were significant lower in the upwelling region off Vietnam. A total of 144 taxa of phytoplankton were identified in the study area. The dominant genera were Prorocentrum, Gonyaulax, Gyrodinium, Scrippsiella and Chaetoceros, respectively. Spatial patterns of early-summer phytoplankton abundance and species composition should be mainly controlled by the upwelling off Vietnam and the discharge of Mekong River in the southern SCS. Diatoms dominated in the nutritious Mekong River Estuary or upwelling region off Vietnam; while dinoflagellates dominated in the oligotrophic pelagic region. The canonical correspondence analysis (CCA) indicates that most of diatoms favor higher levels of silicate and phosphorus, as well as lower temperature; while most of dinoflagellates favor the lower silicate and phosphorous and higher temperature. Correlation and CCA results indicate that silicate, nitrate and temperature were the most relevant environmental factors to regulate the horizontal pattern of early-summer phytoplankton in the surface waters of southern SCS.
TL;DR: In this paper, the authors used vertical trawling to sample zooplankton at 82 stations in the northern South China Sea during summer, winter, and spring to understand how hydrological and biological factors affect near-to-off-shore variations in the siphonophore community.
Abstract: To understand how hydrological and biological factors affect near- to off-shore variations in the siphonophore community, we sampled zooplankton at 82 stations in the northern South China Sea during summer, winter, and spring. Forty-one species of siphonophore were collected by vertical trawling. The species richness of siphonophores increased from the nearshore to offshore regions in all three seasons of investigation, with maximum richness in summer and minimum richness in winter. The abundance of siphonophores was also higher in summer than in spring and winter, concentrated in the nearshore region in the warm season and scattered in the offshore region in the cold season. Four siphonophore groups were classified according to the frequency of occurrence: nearshore, near-offshore, offshore, and tropical pelagic. Among them, the nearshore group had higher abundance nearshore compared with the offshore. The tropical pelagic group had higher species number offshore than nearshore. Spatial and temporal fluctuations in taxonomic composition and abundance of siphonophores were due to the influence of the coastal upwelling and surface ocean currents of the South China Sea, driven by the East Asia monsoonal system.
TL;DR: It was revealed that socio-economic development was associated with the PFAS contamination in coastal regions of South China, and significant correlations between concentration of total PFASs with gross domestic product (GDP) per capita and population density were found in the areas, suggesting that the influence of intense human activities in these areas may have resulted in higherPFAS contamination to the adjacent environment.
TL;DR: Preliminary environmental hazard assessment showed that PFASs posed minimal risk to marine organisms in the coastal region of the SCS, with the exception of PFOS.
TL;DR: In this paper, a 6-step circulation model of diatoms coupled with shelf hydrodynamics is proposed as the main mechanism of retention of diats in the shelf system.
TL;DR: In this article, the authors investigated nutrient biogeochemistry in coastal areas was affected by human activities (e.g., aquaculture, agriculture, and by natural phenomena including typhoons) and provided an overview of human perturbations of coastal ecosystems in this tropical region.
Abstract: . Nutrient dynamics based on field observations made along the eastern Hainan Island during the period 2006–2009 were investigated to understand nutrient biogeochemical processes, and to provide an overview of human perturbations of coastal ecosystems in this tropical region. The rivers showed seasonal variations in nutrient concentrations, with enrichment of dissolved inorganic nitrogen and dissolved silicate, and depletion of PO43−. High riverine concentrations of nitrate mainly originated from agricultural fertilizer inputs. The DIN : PO43− ratios ranged from 37 to 1063, suggesting preferential depletion of PO43− relative to nitrogen in rivers. Chemical weathering in the drainage area might explain the high levels of dissolved silicate. Aquaculture ponds contained high concentrations of NH4+ and dissolved organic nitrogen. The particulate phosphorus concentrations in the study area were lower than those reported for estuaries worldwide. The particulate silicate levels in rivers and lagoons were lower than the global average level. Nutrient biogeochemistry in coastal areas was affected by human activities (e.g., aquaculture, agriculture), and by natural phenomena including typhoons. The nutrient concentrations in coastal waters were low because of dispersion of land-derived nutrients in the sea. Nutrient budgets were built based on a steady-state box model, which showed that riverine fluxes are magnified by estuarine processes (e.g., regeneration, desorption) in estuaries and Laoyehai Lagoon, but not in Xiaohai Lagoon. Riverine and groundwater inputs were the major sources of nutrients to Xiaohai and Laoyehai lagoons, respectively, and riverine inputs and aquaculture effluents were the major sources for the eastern coast of Hainan Island. Nutrient inputs to the coastal ecosystem increased with typhoon-induced runoff of rainwater, elucidating the important influence of typhoons on small tropical rivers.
TL;DR: In this article, a three end-member mixing model based on lignin phenol yields and stable carbon isotopic compositions was used to distinguish sources of organic matter (OM) in riverine particles and surface sediments from the northern South China Sea.