Fajin Chen

Fajin Chen
Guangdong Ocean University · College of Ocean and Meteorology

PhD

About

93
Publications
14,968
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
1,031
Citations
Introduction
My research work focus on the biogeochemistry of carbon and nitrogen in modern and paleo oceanic environments. I am experienced in using a variety of stable isotopes to study the coupled physical-biogeochemical processes.

Publications

Publications (93)
Article
The decrease of river runoff caused by the intensified human activities (e.g. artificial dams) and increasing intrusion of high salinity water in the coastal bays have become a worldwide environmental problem. However, the mixing can hardly be identified by traditional method with temperature and salinity due to the complicated water sources in the...
Article
Full-text available
A new data set of seasonal stable water isotopes (δD and δ¹⁸O) and temperature‐salinity profiles was applied to improve our understanding of water mass distributions and their impact on the environment of the Beibu Gulf (BG). Our study revealed that the coastal current (CC), West‐Guangdong coastal current (WGCC), and South China Sea water (SCSW) we...
Article
Full-text available
Heavy metal pollution in the mariculture areas is of considerable attention due to its potential ecological effects and public concern for seafood safety. A better understanding of the current contamination status and historical trend of heavy metals in the ecosystems of mariculture areas has an important implication for the sustainable development...
Article
Full-text available
This study investigated the total concentrations and geochemical compositions of metals (Cd, Cr, Cu, Ni, Pb, Zn, Fe and Mn) in surface sediments of Zhanjiang Bay (ZJB) in spring and summer, to assess the contamination status, mobility and influencing factors of spatial-seasonal changes of these metals. The average total concentration for each studi...
Article
Full-text available
Dual isotope measurements were performed on nitrate (δ¹⁵N‐NO3⁻ and δ¹⁸O‐NO3⁻) in the Pearl River Estuary (PRE) and the adjacent northern South China Sea (NSCS) to investigate nitrate sources and its biogeochemical processes during rainy season. Our results indicated that in the PRE, high nitrate levels were associated with the intense human activit...
Article
Full-text available
The Northwest Pacific Ocean (NWPO) is a significant sink for atmospheric CO2 but a paucity of large-scale phytoplankton surveys in the upper and lower euphotic zone results in uncertainties in estimates of the efficiency of the biological carbon pump there. Here, we report the spatial distribution of lipid biomarkers from diatoms (brassicasterol/ep...
Article
Full-text available
The eutrophication degree in the coastal bay has been increasing significantly for the past years, due to the increasing nutrient discharge. However, the factors controlling sources and nitrogen (N) cycling in the different types of bays are still poorly understood. In this comparative study, nitrate dual isotopes ( δ 15 N − NO 3 − and δ 18 O − NO...
Article
Atmospheric ammonia (NH3) is a precursor of the ammonium (NH4⁺) in rainwater and aerosol. However, relations among them are largely unknown, which preventing our understanding from the sources and spatio-temporal variability of the NH4⁺ in rainwater and aerosol. Concentration and stable nitrogen isotope (δ¹⁵N) of NH4⁺ were measured in bulk depositi...
Article
In this study, we present high-resolution δ¹⁵N records of organic nitrogen (δ¹⁵Norg) from the northern inner shelf of the South China Sea (SCS) to reveal nitrogen processes in the coastal environment over the last 7500 years. To remove the bias effect from inorganic nitrogen (IN), mainly terrestrial clay lattice-fixed ammonia, on total/bulk nitroge...
Article
Full-text available
Microplastic (MP) was investigated in Zhanjiang Bay, a semi-enclosed bay in south China and famous for considerable mariculture industry, to evaluate whether mariculture activities accelerated MP pollution. The MP abundances ranged from 0 to 2.65 n/m³ (number/m³), showing seasonal variances with higher levels in May and September and lower levels i...
Article
Dual nitrate isotopes (δ¹⁵N–NO3⁻ and δ¹⁸O–NO3⁻) and NO3⁻ concentration were measured in aerosol and precipitation in Zhanjiang, a tropical city in the southmost tip of China mainland, between November 2018 and October 2019. Measurements aimed to identify possible formation processes of NO3⁻, sources and the difference of dual nitrate isotope betwee...
Article
Global climate change is an indisputable fact, and anthropogenic disturbances are the likely driving mechanisms; moreover, marginal seas tend to respond faster than the global ocean. In this study, the transit time distribution method was used to estimate the anthropogenic carbon (Cant) in the typical marginal seas along the west side of North Paci...
Article
Full-text available
The impact of typhoons on the ecology of the ocean has been observed using high‐accuracy satellite remote sensing data. However, few field observations in the ocean have been conducted to understand the effect of typhoons on the biogeochemistry because typhoon is furious, dangerous, and unpredictable. Here, we investigated the impact of Typhoon Wip...
Article
Full-text available
The upper-ocean physical and biochemical responses to sequential tropical cyclones (TCs) Kyarr and Maha in the Arabian Sea (AS) were investigated using data from satellites and Bio-Argo floats. Corresponding to slow and strong sequential TCs, two cooling processes and two short chlorophyll a (chl-a) blooms occurred on the sea surface, separated by...
Article
Full-text available
Few systematic investigations use isotopic compositions (δ¹⁸O and δD) of seawater together with water temperature and salinity to trace the water dynamic processes in the upwelling area. This study presents depth‐specific δ¹⁸O, δD, salinity (S), and temperature data of water samples collected from the northwestern South China Sea (NWSCS) during spr...
Article
Full-text available
Due to the intensive human activities and rapid economic development during the past few decades, the anthropogenic sourced nitrogen (N) input into coastal waters has increased dramatically. In this study, the net anthropogenic nitrogen input (NANI), including the deposition of atmospheric N, the application of N fertiliser, the fixation of biologi...
Article
The Late Devonian Frasnian-Famennian (FF) transition at ca. 367 Ma was a key event in Phanerozoic Eon involving a massive biotic crisis, which coincided with a positive carbon isotope anomaly and large climate changes associated with eustatic fluctuations. The details underpinning the initiation of the mass extinction, however, remain problematic....
Article
Full-text available
The El Niño–Southern Oscillation is one of the most important drivers of climate change on Earth, and is characterised by warmer (El Niño) or colder (La Niña) ocean surface temperatures in the equatorial Pacific. Tropical cyclones (TCs) and meridional circulation are the most influential weather events and climate phenomena, respectively. However,...
Article
Surface currents play an essential role in the worldwide distribution of microplastics in the coastal seas and open oceans. As a branch of the western boundary currents (WBCs), Kuroshio changes seawater properties and pollutant levels of the South China Sea (SCS) during its intrusion process. To study the impact of Kuroshio intrusion on microplasti...
Article
The δ¹³C, δ¹⁵N and C/N ratio of the particulate organic matter (POM) in western Guangdong waters were determined to evaluate the impacts of the coastal currents on the POM in spring and summer. The predominance of photosynthetic organic matter in the nearshore was triggered by nutrients brought by the coastal currents in spring and summer, while th...
Article
Full-text available
Isotope measurements were performed on dissolved nitrate (NO3−) and ammonium (NH4+) in the coastal waters of the northeastern Beibu Gulf, China, to investigate the seasonal nitrate sources and their biogeochemical processes, which are due to the rapid development of local industrialisation and urbanisation. The high N/P ratio observed in the coasta...
Article
In order to understand origin and fate of particulate organic matter, the isotopic composition (δ13C and δ15N), total organic carbon content, total nitrogen content, and C/N ratios were measured for suspended particulate organic matter (POM) collected from the northern South China Sea (NSCS) during summer. Our study revealed that δ13C generally dec...
Article
Full-text available
A comprehensive, depth specific (near-surface to 3700 m) water isotope (δD and δ18O) dataset of 237 water samples collected from 20 different locations from the Northwest Pacific (NP) through the Luzon Strait (LS) to the Northern South China Sea (NSCS) are used to clarify the deeper understanding of water mass processes using δ18O-salinity (S) and...
Article
Full-text available
High-resolution stalagmite oxygen isotope (δ18O) records are widely employed in palaeoclimate studies as indicators of East Asian Monsoon intensity in southern China. A key issue is whether the East Asian Monsoon or other factors control δ18O in precipitation in southern China, which requires modern observations to confirm. To understand which fact...
Article
Full-text available
Typhoons frequently induce algal blooms in the open ocean based on the satellite remote sensing data. However, the effects of typhoons on nearshore areas are not fully clarified due to the inaccessibility of in situ sampled data and the low accuracy of satellite data in the nearshore areas. To understand the biogeochemical and ecological changes in...
Article
Full-text available
Abrupt climatic events and the history of human activities on Hainan Island are poorly understood, due to the lack of high-resolution records. We present high-resolution multiproxy records from the coastal shelf off eastern Hainan Island in China to investigate abrupt climate change and regional human–environment interaction over the last 7,000 yea...
Article
Full-text available
We investigated the distributions of phosphate (PO4-P) and used the oxygen isotope composition of phosphate (δ¹⁸OP) to quantify PO4-P sources in the waters of Huangbai River. According to the environmental characteristics of Huangbai River basin, the sampling stations in the Huangbai River were divided into three groups: sampling stations in the ph...
Article
The presence of polychlorinated biphenyls (PCBs) and dichlorodiphenyltrichloroethanes (DDTs) was determined in the sediments of Beibu Gulf, a newly developing industry and port in South China, to evaluate whether the rapid development of coastal cities has accelerated the organic pollution in the region. The levels of PCBs and DDTs ranged from 1.17...
Article
Full-text available
In this study, the isotopic composition (δ13C and δ15N), total organic carbon content, total nitrogen content, and C/N ratios of suspended particulate organic matter (POM) in Zhanjiang Bay, which is a semi-enclosed bay with concentrated artificial activities in Southern China, were analyzed in order to investigate the seasonal variations in the pri...
Article
The isotopic compositions (δ 13 C and δ 15 N) and C/N ratios of suspended particulate organic matter (POM) were investigated off the east coast of Hainan Island in the South China Sea during summer. Coastal upwelling influenced the nearshore stations of transects S2 and S3, and higher δ 13 C and δ 15 N values suggested that coastal upwelling played...
Article
Full-text available
Using cruise observations before and after the typhoon Chebi in August 2013 and those without the typhoon in July 2012, this study investigates variations in current structure, nutrient distribution, and transports disturbed by a typhoon in a typical coastal upwelling zone east of Hainan Island in the northwestern South China Sea. The results show...
Article
Full-text available
The tidal dynamics and the characteristics of pollutant migration in the drowned-valley tidal inlet, a typical unit of coastal tidal inlets, are strongly influenced by geomorphological features. Along with the development of society and the economy, the hydrodynamic and water quality environment of the tidal inlet is also becoming more disturbed by...
Article
Full-text available
BIO-Argo float (chlorophyll a (Chl-a), temperature, and salinity profiles) and remote sensing data (Chl-a, photosynthetic available radiation (PAR), and wind) located south of the Kuroshio current near Shikoku from September 2018 to May 2019 were used to study phytoplankton bloom and their mechanisms of development in open oceans. Results show that...
Article
Dichlorodiphenyltrichloroethane (DDT) is well known for its harmful effects and has been banned around the world. However, DDT is still frequently detected in natural environments, particularly in aquaculture and harbor sediments. In this study, 15 surface sediment samples were collected from a typical tropical bay (Zhanjiang Bay) in the South Chin...
Article
During the Late Cretaceous period (~100.5–65 million years ago), two episodes of expansive lake anoxia occurred in the Songliao Basin (~3× the size of Lake Superior), NE China, either lasting less than one million years. These events, known as lacustrine anoxic events (LAEs), were the factors driving the development of the main source rocks for the...
Article
Full-text available
The isotopic composition (δ¹³C and δ¹⁵N), organic carbon and nitrogen contents and C/N ratios of suspended particulate organic matter (POM) collected from the Pearl River Estuary and the adjacent shelf during spring and summer of 2017 were determined to understand the main controlling factors of spatiotemporal distribution and to elucidate the sour...
Article
Full-text available
High-resolution Holocene marine sediment records are limited, which hampers our understanding of paleomonsoon evolution. Continental shelf sediment records are derived mainly from terrestrial weathering products and are thus often sensitive to paleoclimate variations. In this study, the grain size and magnetic mineral composition of a well-dated se...
Article
The multiple and complex N sources in coastal upwelling areas make it difficult to understand the behaviour of the N cycle. Stable N and O isotopes (δ¹⁵N and δ¹⁸O) of nitrate (NO3⁻) from coastal upwelling off eastern Hainan Island in the South China Sea (SCS) identified the main NO3⁻ sources and the processes that control NO3⁻ distribution in the a...
Article
Full-text available
Dissolved oxygen (DO) is one of the most important factors for maintaining a healthy marine ecosystem. The information of DO in large estuaries or bays with large entrances has been widely studied, while it is relatively limited for a bay with a narrow entrance which is vulnerable to human activities. The Zhanjiang Bay, located in the northwestern...
Article
Full-text available
The distribution of aerosols and their impacts on chlorophyll‐a (Chl‐a) distribution were studied in the South China Sea (SCS). Seventeen years of aerosol optical depth (AOD) data, Chl‐a concentration data, wind speed (WS) and sea surface temperature (SST) from satellite observations were employed along with two years of in situ aerosol total suspe...
Article
Full-text available
Nitrogen isotope of ammonium (δ¹⁵N-NH4 ⁺) in the wet deposition in Zhanjiang, a typical tropical city in the southernmost region of mainland China, were analyzed from October 2015 to November 2018 in order to examine the monthly variations and identify the sources of ammonia. The NH4 ⁺ exhibited higher concentrations during the dry season than the...
Article
Upper ocean responses to the passage of sequential tropical cyclones over the northwestern South China Sea (SCS) in 2011 were investigated using satellite remote sensing data, Argo reanalysis data, and an array of mooring data. We found that the sea surface low temperature region lasted for more than 38 days and two phytoplankton blooms occurred af...
Article
Full-text available
Nitrate (NO3−) dual isotope analysis was performed in Zhanjiang Bay, which is a closed bay with intensive human activities in South China, to investigate seasonal changes in the main NO3− sources and their biogeochemical processes in the monsoon-controlled climate. The relatively low N/P ratios in Zhanjiang Bay suggests that nitrogen (N) is a limit...
Article
Full-text available
Elemental (total organic carbon (TOC) and total nitrogen (TN)) and stable carbon and nitrogen isotope compositions (δ 13 C and δ 15 N, respectively) in the surface sediment of Zhanjiang Bay (ZJB) in spring and summer were measured to study the spatial and seasonal changes of organic matter (OM) and assess the human-induced and environment-induced c...
Article
Full-text available
Typhoons frequently affect the South China Sea (SCS), playing an important role in changing the coastal marine system. To determine which process has the greatest impact on material transport in the coastal marine area during a typhoon, the sea temperature, salinity, concentration of nutrients, chlorophyll-a, total suspended matter, and δ¹³C of par...
Article
Full-text available
As a semi-closed bay with narrow bay mouths, the distribution of nutrients in Zhanjiang Bay was different from bays with open bay mouths and rivers with large flows. It is important to study the water quality of Zhanjiang Bay to determine the impact of human activities on this semi-closed bay. Based on field survey data in spring, the spatial distr...
Article
The widely developed dark mudstone in the Upper Cretaceous Nenjiang Formation of the Songliao Basin is a natural archive for reconstructing the palaeoenvironment. A time series sulfur isotope study on the Nenjiang Formation reveals that authigenic pyrite from the paleo-lake is enriched in ³⁴S relative to coeval marine sulfate in the lower Nenjiang...
Article
To study the impact of rapid industrialization and urbanization in Guangxi Province on the coastal environment in recent years, seven metals (Hg, Cu, Pb, Cd, Cr, Zn and As) were investigated in the surface seawater and sediments of the northern Beibu Gulf. The levels of the metals were lower than in other regions in China, but Hg, Cu and Cd showed...
Article
To study the contamination of heavy metals in the aquaculture area of Beibu Gulf, the concentrations of seven metals in seawater were investigated. The results showed that significant seasonal and spatial distributions of heavy metals were observed in the four aquaculture areas. Generally, the heavy-metal concentrations in the Maowei Sea were highe...
Article
Dual isotope nitrate (NO3 −) analysis was performed on the western coast of Guangdong Province to investigate seasonal changes in the main nitrate sources and their biogeochemical processing, which are due to the rapid development of the local economy. In the nearshore area, significant seasonal variations of nitrate sources oc�curred. The dominant...
Article
Full-text available
【Objective】To analyze the temporal variations of temperature, salinity and water level of freshwater lens and and discuss its influencing factors .【Method】The data of water level, temperature,and conductivity were collected by the in-situ observation of a three-parameter instrument of LTC on borehole in Yongxing Island from December, 2014 to Decemb...
Article
Full-text available
Terrestrial nitrogen (N) cycling is closely associated with precipitation and crucial to ecosystem, which has been receiving great concerns at the backdrop of global climate change. In addition to modern investigations, paleo record of N cycling may provide valuable clues about how ecosystem N responds to climate change. Here we measured soil organ...
Article
Full-text available
To ensure the safety of coastal nuclear power plants, accurately simulating water depth due to flooding resulting from heavy rainfall and tropical storms is important. In this paper, a combined model is developed to analyze and simulate the drainage capacity in a coastal nuclear power plant under the combined action of extreme rainfall and wave ove...
Article
Atmospheric particulate samples were collected during three typhoons in 2006 (Chanchu, Bilis, and Kaemi) from Dongshan and Pingtan Islands along the coastal areas of Fujian Province and were analyzed for organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs). The observations were divided into three periods, namely, pre-typhoon, typh...
Article
Full-text available
Nitrate (NO3⁻) concentrations and their dual isotopic compositions (δ¹⁵N-NO3⁻ and δ¹⁸O-NO3⁻) were measured to constrain N sources and their cyclic processes in summer using samples from the water column of the northern South China Sea (NSCS). Our data revealed that higher NO3⁻ concentrations and δ¹⁵N-NO3⁻ values were observed in the upper waters of...
Article
Atmospheric particulate samples collected from Pingtan Island in Fujian province were analyzed for 20 organochlorine pesticides (OCPs) with the aims of elucidating the contamination levels and their influence factors, and providing more comprehensive and fundamental data for the risk assessment of OCPs in this coastal area. The concentration of tot...
Article
The Huguangyan Maar Lake is the biggest maar lake in the world. It is nearly closed and less disturbed by the surroundings. Existing work is mainly on its palaeoclimatological and the ecology environment research. The research on nutrients and their biogeochemical cycling in maar lakes is rare. Therefore, it has great significance to conduct such r...