A5049202397- Marine and coastal ecosystems
- Mercury impact and mitigation studies
- Marine Biology and Ecology Research
- Heavy metals in environment
- Isotope Analysis in Ecology
- Geochemistry and Elemental Analysis
- Geology and Paleoclimatology Research
- Oceanographic and Atmospheric Processes
- Groundwater and Isotope Geochemistry
- Water Quality and Pollution Assessment
- Atmospheric chemistry and aerosols
- Analytical chemistry methods development
- Methane Hydrates and Related Phenomena
- Atmospheric and Environmental Gas Dynamics
- Electrochemical Analysis and Applications
- Marine Bivalve and Aquaculture Studies
- Hydrocarbon exploration and reservoir analysis
- Environmental Toxicology and Ecotoxicology
- Iron oxide chemistry and applications
- Microbial Community Ecology and Physiology
- Marine and fisheries research
- Water Quality Monitoring and Analysis
- Context-Aware Activity Recognition Systems
- Aquatic Ecosystems and Phytoplankton Dynamics
- Radioactive contamination and transfer
Fujian Medical University
2024
University of Miami
2011-2021
Shenzhen University
2017-2018
Massachusetts Institute of Technology
1997-2018
Imperial College London
2018
University of Alaska Fairbanks
2002-2009
Institute of Oceanology
2007-2009
Chinese Academy of Sciences
2007-2009
South China Sea Institute Of Oceanology
2007-2009
International Arctic Research Center
2003-2008
Surface waters of the subtropical Sargasso Sea contain dissolved inorganic phosphate (DIP) concentrations 0.2 to 1.0 nanomolar, which are sufficiently low result in phosphorus control primary production. The DIP this area (which receives high inputs iron-rich dust from arid regions North Africa) one two orders magnitude lower than surface levels Pacific (where eolian iron much and water column denitrification is more substantial). These data indicate a severe relative depletion Atlantic. We...
In the oligotrophic North Atlantic and Pacific, ultrafiltration studies show that concentrations of soluble iron iron-binding organic ligands are much lower than previously presumed "dissolved" concentrations, which were operationally defined as passing through a 0.4-micrometer pore filter. Our indicate substantial portions (and probably also ligands) present in colloidal size range. The depleted at surface enriched depth, similar to distributions major nutrients. By contrast, shows maximum...
Abstract. Marine N2 fixing microorganisms, termed diazotrophs, are a key functional group in marine pelagic ecosystems. The biological fixation of dinitrogen (N2) to bioavailable nitrogen provides an important new source for ecosystems and influences primary productivity organic matter export the deep ocean. As one series efforts collect biomass rates specific different phytoplankton groups, we have constructed database on diazotrophic organisms global upper ocean by compiling about 12 000...
A simple low-blank method is described for the analysis of Pb, Cu, and Cd in seawater using Mg(OH)2 coprecipitation isotope dilution inductively coupled plasma mass spectrometry (ICPMS). Here, 20−40 μL 9 M aqueous NH3 mixed into a 1.3 mL sample spiked with enriched isotopes Cd. After centrifugation, supernatant discarded precipitate dissolved 100 5% HNO3 ICPMS analysis. This simple, accurate, precise, detection limits Pb = pM, Cu 39 5.0 pM blanks 0.62 27 6.0 pM. The demonstrated by...
In nearly a dozen open‐ocean fertilization experiments conducted by more than 100 researchers from 20 countries, adding iron at the sea surface has led to distinct increases in photosynthesis rates and biomass. These confirmed hypothesis proposed late John Martin [ , 1990] that dissolved concentration is key variable controls phytoplankton processes ocean waters However, measurement of seawater remains difficult task Bruland Rue 2001] with significant interlaboratory differences apparent...
Dissolved inorganic phosphorus (DIP) concentrations in the oligotrophic surface waters of South China Sea decrease from ∼20 nM March 2000 to ∼5 July 2000, response seasonal water column stratification. These minimum DIP are one order magnitude higher than those P‐limited, iron‐replete stratified western North Atlantic, suggesting that ecosystem may be limited by bioavailable nitrogen or some trace nutrient rather DIP. Nutrient enrichment experiments using either nitrate, phosphate both...
Characterization of the speciation iron and copper is an important objective GEOTRACES Science Plan. To incorporate measurements into such a multinational program, standard practices must be adopted that allow data from multiple labs to synthesized. Competitive ligand exchange‐adsorptive cathodic stripping voltammetry (CLE‐ACSV) primary technique employed for measuring metal‐binding ligands determining metal in seawater. The determination concentrations conditional stability constants...
Here we report measurements of iron and aluminum in surface subsurface waters during late March May 2001 on transects between central California Hawaii. A large cloud Asian dust was detected April 2001, there a clear signal water due to aerosol deposition the transect. Iron concentrations increased synchronously by 0.5 2 nM along southern portion transect, which includes Hawaii Ocean Time series (HOT) station, from background values (0.1 0.2 Fe). These changes occurred ratio that is close...
We used an improved adsorptive cathodic stripping square‐wave voltametry method to determine vertical profiles of three operationally defined fractions iron in the western North Atlantic Ocean. “Dissolved Fe” (<0.2‐ µ m fraction) exhibited a nutrient‐type distribution during our October 1991 cruise, with concentrations increasing from 0.2 nM surface water 0.9 at 1,000 m. However, July 1992 concentration dissolved Fe was higher (0.6 nM), decreased subsurface minimum depth 50 m, then...
volcanic particles and a phytoplankton bloom. FLH was found to be ∼9–17 × 10 −3 mW cm −2 mm −1 sr in the patch ∼3– 5×1 0 ambient water, indicating that 2–5‐fold increase biological activity occurred during week following eruption. Satellite altimetry indicated bloom took place presence of downwelling not result upwelled nutrients this oligotrophic ocean. Analysis satellite ocean color spectra region similar as reference Trichodesmium spectra. Laboratory experiments further substantiate...
Observational and modeling studies in the Bering Sea indicate that changes seasonal ice cover time of retreat influence open‐water productivity. In particular, timing spring bloom its phytoplankton community composition are affected. Dissolved iron (DFe) data water column cores collected during 2007‐ Ecosystem Study (BEST) cruise melting provided substantial DFe to column. The additional input from sea could be biologically important along outer shelf break where ice‐free areas insufficient...
Abstract The internal cycling of zinc (Zn) in the ocean has been a longstanding mystery. Particularly puzzling is strong correlation between Zn and silicate (SiO 4 4− ), but not phosphate (PO 3− even though involved with cell functions that regulate PO uptake are unrelated to SiO uptake. To help solve this mystery, we use an artificial neural network produce global maps dissolved Zn, then diagnostic model infer rates regeneration for , . We find plankton Southern Ocean account 62 (±32)%...
Abstract Nitrate (NO 3 − ), one of the most important inorganic aerosols in atmosphere, is mainly formed by oxidation NO x hydroxyl radical (OH) and ozone (O ) urban atmospheres. However, fractional contributions its various pathways remain unclear. Here, we collected particulate matter with aerodynamic diameter less than 2.5 μm (PM samples a second‐tier city southeast China from 1 September to 31 December 2017 measured nitrate isotopic compositions (δ 15 N δ 18 O). The average concentration...