Minhan Dai

Minhan Dai
Xiamen University | XMU · State Key Laboratory of Marine Environmental Science

PhD

About

334
Publications
92,263
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Introduction
Minhan Dai is a Chair Professor of Marine Biogeochemistry at Xiamen University, China (http://mel.xmu.edu.cn/staff.asp?tid=13). Minhan Dai’s research interests include ocean biogeochemistry of carbon and nutrients and geochemistry of radioactive elements in surface and ground waters. He's experienced in Interdisciplinary researches on coupled physical-biogeochemical processes. He recently expends his research on Integrated Ocean Governance and Management.
Additional affiliations
September 1998 - present
Xiamen University
May 1995 - September 1998
Woods Hole Oceanographic Institution
Education
August 1991 - May 1995
Sorbonne Université
Field of study
  • Earth Science

Publications

Publications (334)
Article
Full-text available
Reconstructing past changes in the oceanic nitrate inventory with sedimentary N records in the South China Sea (SCS), which is the terminal of North Pacific Intermediate Water (NPIW), has regional and global implications. However, water-column nitrate cycling that affects N isotope preservation remains poorly understood in the SCS. We present a new...
Article
The ocean, being the largest carbon reservoir on the Earth surface, plays an irreplaceable role in regulating climate change and also has great potential for negative emissions. Here, we briefly review the ocean carbon storage processes and mechanisms that have been recognized to date, including the solubility pump (SP), carbonate counter pump (CCP...
Article
Full-text available
Nitrogen fixation is critical for the biological productivity of the ocean, but clear mechanistic controls on this process remain elusive. Here, we investigate the abundance, activity, and drivers of nitrogen-fixing diazotrophs across the tropical western North Pacific. We find a basin-scale coherence of diazotroph abundances and N 2 fixation rates...
Article
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Coastal oceans, known as the major nitrous oxide (N2O) source to the atmosphere, are increasingly subject to eutrophication and concurrent near-bottom hypoxia. The natural nitrogen cycle is likely to be altered markedly in hypoxic coastal oceans. However, the processes responsible for N2O production and emission remain elusive because of lacking fi...
Article
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Coastal downwelling is generally considered to have a limited biological effect compared with coastal upwelling. In this study, downslope transport of nearshore, nutrient-enriched waters during downwelling is found to induce distinct biological productivity in the water column over the northeastern South China Sea (NSCS). By conducting a process-dr...
Article
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In this paper, we outline the need for a coordinated international effort toward the building of an open-access Global Ocean Oxygen Database and ATlas (GO2DAT) complying with the FAIR principles (Findable, Accessible, Interoperable, and Reusable).
Article
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As a key intermediate in the nitrogen cycle, nitrite is involved in multiple biological pathways that regulate the distribution and availability of nitrogen in the ocean. In the oligotrophic gyres, nitrite accumulates near the base of the euphotic zone, demonstrating a subsurface maximum, termed the primary nitrite maximum; while in subpolar region...
Article
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The advective supply of allochthonous dissolved organic carbon (DOC) from open ocean to marginal seas through western boundary current intrusion influences the regional carbon inventory and microbial activities. However, there is limited observation about this process and its biogeochemical impacts on marginal seas. In this study, we investigated t...
Article
Information on the sources and transformations of particulate organic N (PN) and dissolved organic N (DON) at the coastal interface remains insufficient due to technological difficulties and complicated features of intensive physical mixing and rapid biological activities. Here, we investigated the spatial distribution of concentrations and isotopi...
Article
Full-text available
Plain Language Summary Barium is a nutrient‐type trace element in the ocean and has been widely used for tracing circulation, biological productivity, and land‐ocean interactions. Riverine input is the largest source of oceanic Ba but the Ba properties of this input can be altered during transport along river estuaries. The recent development of st...
Article
Ammonium (NH4+) dynamics in the oligotrophic South China Sea (SCS) were examined using data collected during summer 2014 and spring 2016. A sensitive fluorometric technique was used to measure NH4+ concentrations (detection limit of 0.7 nmol L−1). The NH4+ inventory of the upper 100 m showed considerable variation between two samplings, averaging 3...
Article
Full-text available
Aim In microbial biogeography, it is crucial to link spatial patterns with underlying drivers in natural ecosystems. Bacterial communities driving key biogeochemical processes in coastal zones, which are important interfaces between terrestrial and marine ecosystems, are affected by perturbations due to both natural and anthropogenic factors. Howev...
Article
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Nutrients limiting phytoplankton growth in the ocean are a critical control on ocean productivity and can underpin predicted responses to climate change. The extensive western subtropical North Pacific is assumed to be under strong nitrogen limitation, but this is not well supported by experimental evidence. Here, we report the results of 14 factor...
Article
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To distinguish between the distribution and activity of ammonia-oxidizing bacteria (AOB) and ammonia-oxidizing archaea (AOA) in the Pearl River estuary (PRE), we investigated the DNA-and cDNA-based β-proteobacterial and archaeal amoA genes on three size-fractionated particles of >3.0 µm, 0.45-3.0 µm, and 0.22-0.45 µm. Results showed that AOB were m...
Article
We present tritium (³H) and helium isotope (δ³He) data from the South China Sea (SCS), to estimate apparent oxygen utilization rates (AOURs). The observed δ³He values are close to the theoretical solubility equilibrium value of ∼ -1.7% in the upper mixed layer, followed by an increase with depth down to ∼1500 m. Below 1500 m depth, δ³He is homogeno...
Article
Mesoscale eddies may enhance nutrient injection into the photic zone and ultimately the magnitude and composition of particle export to depth. Using satellite altimetry, we identified 38 cyclonic eddies that passed in close proximity to the Hawaii Ocean Time‐series (HOT) Station ALOHA, located in the North Pacific Subtropical Gyre, from 1993 to 201...
Article
For the first time the vertical variation in light quality in the global ocean is quantified with a single parameter--the hue angle (αE, in degree) in chromaticity of downwelling irradiance. For oceanic waters, αE is ~140° at surface, but it becomes ~230° at the bottom of the euphotic zone; αE changes rapidly near the surface, and we term this laye...
Article
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The driving mechanisms of submarine groundwater discharge (SGD) in Sanya Bay in the northern South China Sea were investigated using a combination of time‐series observation and modeling, as well as the influences of SGD on the carbonate system of a coastal coral reef. SGD flux, characterized by high variability on flood‐ebb and spring‐neap tidal c...
Article
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The Indo-Pacific Intersection (IPI), centered in Indonesian Seas (IS) and the South China Sea (SCSqwe), is a convergence zone of both hydrological and atmospheric circulation and plays an important role in the water cycle and global climatic system. This study presents a unique dataset of both ²³⁹⁺²⁴⁰Pu activity and ²⁴⁰Pu/²³⁹Pu atom ratios to trace...
Article
Based on large-scale surveys conducted during all four seasons from 2009 to 2011, we investigated the carbonate systems on the northern South China Sea (NSCS) shelf featuring much higher variations in both seasonality and spatiality on its inner-shelf (<40 m) as compared to the areas on the mid-outer shelf (>40 m). The most notable forcing on the m...
Article
Full-text available
We examined the evolution of intermittent hypoxia off the Pearl River estuary based on three cruise legs conducted in July 2018: one during severe hypoxic conditions before the passage of a typhoon and two post-typhoon legs showing destruction of the hypoxia and its reinstatement. The lowest ever recorded regional dissolved oxygen (DO) concentratio...
Article
Nutrients are typically the most important determinant of the productivity of marine ecosystems. Hence, nutrients have been an essential variable of ocean observations in the modern oceanography era. Understanding of marine ecosystems and biogeochemistry, however, is largely limited by the spatiotemporal coverage of nutrient data. Herein, we develo...
Article
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Submarine groundwater discharge (SGD) is a crucial material transport pathway across the continent–ocean margins. To evaluate the geochemical impacts of SGD on the western shelf of the northern South China Sea (NSCS), salinity, temperature, and radium were investigated in the summer of 2012. With Ra box models, the flux of SGD was estimated to be (...
Article
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Sea surface partial pressure of CO2 (pCO2) data with a high spatiotemporal resolution are important in studying the global carbon cycle and assessing the oceanic carbon uptake. However, the observed sea surface pCO2 data are usually limited in spatial and temporal coverage, especially in marginal seas. This study provides an approach to reconstruct...
Article
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Carbon dioxide partial pressure (pCO2) in surface water was continuously measured every 3 h from July 2012 to June 2013 using a moored autonomous pCO2 system (MAPCO2) deployed on a moored buoy on the East China Sea shelf (31°N 124.5°E). Sea surface pCO2 and pH had the largest variations in summer, ranging from 215 to 470 µatm, and 7.941 to 8.263 (a...
Article
Full-text available
Observations reveal the high spatiotemporal variability of the hypoxia in the western and eastern coastal transition zones (WCTZ and ECTZ) off the Pearl River Estuary (PRE). We utilized data from cruise observations, buoy mooring, and a three‐dimensional model based on ROMS to investigate the hypoxia variability response to the typical synoptic var...
Technical Report
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Full report available from https://unesdoc.unesco.org/ark:/48223/pf0000376708.locale=en doi:10.25607/h0gj-pq41
Article
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Nitrification plays a central role in the estuar-ine nitrogen cycle. Previous studies in estuary mainly fo-cused on the niche partition between ammonia-oxidizing ar-chaea (AOA) and bacteria (AOB), while the diversity, activity , biogeography, and ecophysiology of different AOA groups remained unclear. Here, we for the first time report on niche par...
Article
Full-text available
Addition of the increased anthropogenic nitrogen (NOx and NHy) emitted from northeast Asian countries to the Yellow and East China seas and coastal waters around Korea has resulted in an unparalleled increase in the nitrate (N) concentration relative to the phosphate (P) and silicate (Si) concentrations in the upper ocean. We found that for the Yel...
Article
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Growing human activities in recent decades have collectively resulted in large amounts of nutrients export into coastal oceans. As the most reactive nitrogen species, ammonium ( NH4+) plays the critical role in biogeochemical cycles in estuaries and the coastal ocean. In the highly polluted Pearl River Estuary (PRE), NH4+ predominates to be the ene...
Article
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Globally expanding hypoxia in estuaries and coastal oceans has largely been attributed to the elevated river nutrient inputs, whereas the role of river-delivered terrestrial organic matter (OM terr) in hypoxia formation has been less investigated. This study uses a coupled physical-biogeochemical model and observations to investigate how OM terr di...
Article
Using a most comprehensive, high quality, high-resolution dataset for any marginal sea up to depths >2000 db, we examined the seasonality of the carbonate system in the northern South China Sea (nSCS) and exchange with the West Philippine Sea (WPS) during 2009–2011. The carbonate system dynamics demonstrated evident spatial and seasonal variations....
Preprint
Full-text available
We examined the evolution of intermittent hypoxia off the Pearl River Estuary during three cruise legs conducted 15 in July 2018: one during severe hypoxic conditions before the passage of a typhoon and two post-typhoon legs showing destruction of the hypoxia and its reinstatement. The lowest ever regional dissolved oxygen (DO) concentration of 3.5...
Article
River-dominated ocean margins (RiOMars), characterized by river plumes and abundant riverine nutrient inputs, are especially critical in determining the oceanic uptake of atmospheric CO2. Using a well validated three-dimensional, coupled physical-biogeochemical model, we examined the dynamics of the carbonate system in the Pearl River plume (PRP) d...
Article
Full-text available
Plain Language Summary Particulate organic matter, produced by phytoplankton in the upper ocean, can sink through the water column and act as a source of organic matter to the deep ocean. These particles are decomposed to carbon dioxide by microorganisms, resulting in dissolved inorganic carbon and organic carbon resistant to decomposition in the d...
Preprint
Full-text available
Sea surface partial pressure of CO2 (pCO2) data with high spatial-temporal resolution are important in studying the global carbon cycle and assessing the oceanic carbon uptake capacity. However, the observed sea surface pCO2 data are usually limited in spatial and temporal coverage, especially in marginal seas. This study provides an approach to re...
Article
Full-text available
Given their ephemeral nature, eddies have proven difficult to study, with contrary results from field observations that typically sample at the center during a specific stage of an eddy lifespan. Using the natural occurring radionuclide 234Th, we examined particle fluxes within two cyclonic eddies (CEs) at different evolutionary stages (mature stag...
Article
Full-text available
Satellite‐derived chlorophyll data, in situ measurements, and time series buoy monitoring revealed the persistent and deteriorating seasonal eutrophication and hypoxia with two distinct centers in the coastal transition zone (CTZ) between the Pearl River Estuary and the adjacent continental shelf off Hong Kong. We used a process‐oriented coupled ph...
Article
The rapidly evolving ocean economy, driven by human needs for food, energy, transportation and recreation, has led to unprecedented pressures on the ocean that are further amplified by climate change, loss of biodiversity and pollution. The need for better governance of human activities in the ocean space has been widely recognized for years, and i...
Article
Enabled by the success in the determination of stable barium (Ba) isotopic compositions in seawater, Ba isotopes have been suggested as a novel tool to study physical and biogeochemical processes in the present and past ocean. However, a better understanding of the fractionation of Ba isotopes during particle-seawater interactions is a prerequisite...
Article
Biogenic silica (BSi), primarily derived from marine diatoms, is a major component of the oceanic silicon cycle. It links with the global carbon cycle through the silicate pump via photosynthesis and the so-called “ballast” effect in many areas of the world’s oceans, particularly in ocean margins. Here we examined the distribution and export of BSi...
Article
Full-text available
In the context of continuously increasing anthropogenic nitrogen inputs, knowledge of how ammonia oxidation (AO) in the ocean responds to warming is crucial to predicting future changes in marine nitrogen biogeochemistry. Here, we show divergent thermal response patterns for marine AO across a wide onshore/offshore trophic gradient. We find ammonia...
Preprint
Full-text available
Nitrification plays a central role in estuarine nitrogen cycle. Previous studies in estuary mainly focused on the niche-partition between ammonia-oxidizing archaea (AOA) and bacteria (AOB), while the diversity, activity, biogeography and ecophysiology of different AOA groups remained unclear. Here, we first time reported niche partitioning as well...
Article
This study examines temporal variations of ²³⁴Th-based particle export based on time-series observations conducted from 2004 to 2014 at the South-East Asian Time-series Study (SEATS) site in the basin area of the Northern South China Sea. It shows significant variability in particle export at both seasonal and interannual time scales. A significant...
Article
Full-text available
Uptake of anthropogenic carbon dioxide (CO2) from the atmosphere has acidified the ocean and threatened the health of marine organisms and their ecosystems. In coastal waters, acidification is often enhanced by CO2 and acids produced under high rates of biological respiration. However, less is known about buffering processes that counter coastal ac...
Article
Estuarine systems are of key importance for the riverine input of silicon (Si) to the ocean, which is a limiting factor of diatom productivity in coastal areas. This study presents a field dataset of surface dissolved Si isotopic compositions (δ³⁰SiSi(OH)4) obtained in the estuaries of three of the world’s largest rivers, the Amazon (ARE), Yangtze...
Article
We surveyed the carbonate system along the main channel of the Chesapeake Bay in June 2016 to elucidate carbonate dynamics and the associated sources of oxygen‐consuming organic matter. Using a two endmember mixing calculation, chemical proxies, and stoichiometry, we demonstrated that in early summer, dissolved inorganic carbon (DIC) dynamics were...
Article
One interesting question in the study of marine microbial ecology is how ocean currents affect the geographic distributions of microorganisms. The Zhe-Min Coastal Current (ZMCC) is strong in winter and could influence the plankton communities in Hong Kong coastal waters by bringing species from far north. In this study, we investigated the spatial...
Article
The South China Sea (SCS) is one of the largest marginal seas in the world, yet the processes that drive its nutrient distribution are not well understood. Using the three-dimensional China Sea Multiscale Ocean Modeling System (CMOMS) embedded with a nitrogen-phosphorus-phytoplankton-zooplankton-detritus ecosystem model, we investigated nutrient tr...
Article
Full-text available
Ammonia oxidation to nitrite and its subsequent oxidation to nitrate provides energy to the two populations of nitrifying chemoautotrophs in the energy-starved dark ocean, driving a coupling between reduced inorganic nitrogen (N) pools and production of new organic carbon (C) in the dark ocean. However, the relationship between the flux of new C pr...