A5006554896- Marine and coastal ecosystems
- Ocean Acidification Effects and Responses
- Geology and Paleoclimatology Research
- Marine Biology and Ecology Research
- Geochemistry and Elemental Analysis
- Geological and Geophysical Studies
- Maritime Navigation and Safety
- Paleontology and Stratigraphy of Fossils
- Marine and environmental studies
- Methane Hydrates and Related Phenomena
- Microbial Community Ecology and Physiology
- Isotope Analysis in Ecology
- Water Quality Monitoring and Analysis
- Analytical Chemistry and Sensors
- Diatoms and Algae Research
- Arctic and Russian Policy Studies
- Groundwater and Isotope Geochemistry
- Oceanographic and Atmospheric Processes
University of Hawaiʻi at Mānoa
2016-2023
University of Hawaii System
2020-2023
Abstract In oligotrophic ocean regions, dissolved organic phosphorus (DOP) plays a prominent role as source of (P) to microorganisms. An important bioavailable component DOP is phosphonates, organophosphorus compounds with carbon‐phosphorus (C‐P) bond, which are ubiquitous in high molecular weight matter (HMWDOM). addition being P, the degradation phosphonates by bacterial C‐P lyase enzymatic pathway causes release trace hydrocarbon gases relevant climate and atmospheric chemistry. this...
Abstract In stratified oligotrophic waters, phytoplankton communities forming the deep chlorophyll maximum (DCM) are isolated from atmospheric iron sources above and remineralized below. Reduced supply leads to a minimum in dissolved (dFe) near 100 m, but it is unclear if limits growth at DCM. Here, we propose that natural addition events occur regularly with passage of mesoscale eddies, which alter dFe other nutrients relative availability light, can be used test for limitation This...
From June to August 2018, the eruption of Kīlauea volcano on island Hawai'i injected millions cubic meters molten lava into nutrient-poor waters North Pacific Subtropical Gyre. The lava-impacted seawater was characterized by high concentrations metals and nutrients that stimulated phytoplankton growth, resulting in an extensive plume chlorophyll a detectable satellite. Chemical molecular evidence revealed this biological response hinged unexpectedly nitrate, despite negligible quantities...
Abstract Photolysis of dissolved organic matter using high‐intensity, ultraviolet (UV) light has been utilized since the 1960s as a method for oxidation and subsequent quantification nitrogen phosphorus (DON DOP) in both freshwater marine water. However, conventional UV systems yielded variable sometimes unreliable results; consequently, fell out favor throughout much oceanographic community. Researchers turned to other methods such persulfate or high‐temperature combustion, even though they...
The 2018 eruption of Kīlauea was associated with massive input molten lava into the coastal ocean, which altered seawater chemistry and increased phytoplankton production. In plumes advected away from site entry, we observed elevated concentrations over a dozen metals relative to background unique isotopic compositions Fe, Cu, Ni, Cd Zn. δ56Fe iron released lower than basaltic, riverine Hawaiʻi, but similar observations other high-temperature hydrothermal vent fluids. However, rapid...
Earth and Space Science Open Archive This work has been accepted for publication in Global Biogeochemical Cycles. Version of RecordESSOAr is a venue early communication or feedback before peer review. Data may be preliminary. Learn more about preprints. preprintOpen AccessYou are viewing the latest version by default [v1]Iron depletion deep chlorophyll maximum: mesoscale eddies as natural iron fertilization experimentsAuthorsNicholas J.HawcoiDBenedettoBaroneiDMatthew...
Abstract The expansion of oxygen deficient zones (ODZs) within the ocean's interior is anticipated to be a major consequence anthropogenic climate change, but past changes in ODZs are poorly defined. Recent mapping efforts have revealed plumes redox‐active metal cobalt ODZs, driving basin‐scale correlation between high and low O 2 . Here, we investigate flux Equatorial Pacific sediments along Line Islands Ridge as novel record fluctuations ODZ extent. After accounting for remobilization by...
Abstract The 2018, subaerial eruption of Kīlauea volcano, Hawaii, resulted in a 5‐km‐long stretch coastline that actively drained lava into the ocean. Nutrients were added to surrounding ocean through dissolution basaltic rock and thermal upwelling deep water, thereby fueling large phytoplankton bloom. Lava‐impacted, surface seawater had high suspended particle loads, concentrations chlorophyll, silicic acid, phosphate (P i ), nitrate, iron elevated up 12, 36, 5, 960, 1,400 times,...