A5070480536- Ocean Acidification Effects and Responses
- CO2 Sequestration and Geologic Interactions
- Atmospheric and Environmental Gas Dynamics
- Fish Ecology and Management Studies
- Marine Biology and Ecology Research
- Soil and Water Nutrient Dynamics
- Marine and coastal ecosystems
- Methane Hydrates and Related Phenomena
- Groundwater and Isotope Geochemistry
- Groundwater flow and contamination studies
- Marine and coastal plant biology
- Oceanographic and Atmospheric Processes
- Aquatic Ecosystems and Phytoplankton Dynamics
- Underwater Acoustics Research
- Hydrocarbon exploration and reservoir analysis
- Water Quality and Resources Studies
- Marine Bivalve and Aquaculture Studies
- Hydrology and Watershed Management Studies
- Arctic and Antarctic ice dynamics
- Radioactivity and Radon Measurements
- Algal biology and biofuel production
- NMR spectroscopy and applications
- Isotope Analysis in Ecology
- Carbon Dioxide Capture Technologies
- Chemical and Physical Properties in Aqueous Solutions
Max Planck Institute for Marine Microbiology
2018-2022
University of Wisconsin–Milwaukee
2015-2021
Grand Valley State University
2018
University of Virginia
2008-2015
University of Georgia
2007-2013
Cornell University
2013
Woodwell Climate Research Center
2005
United States Geological Survey
2004-2005
Carbon capture and storage (CCS) is a key technology to reduce carbon dioxide (CO2) emissions from industrial processes in feasible, substantial, timely manner. For geological CO2 be safe, reliable, accepted by society, robust strategies for leakage detection, quantification management are crucial. The STEMM-CCS (Strategies Environmental Monitoring of Marine Capture Storage) project aimed provide techniques understanding enable inform cost-effective monitoring CCS sites the marine...
We chronicled the seasonally recurring hypolimnetic hypoxia in Muskegon Lake – a Great Lakes estuary over 3 years, and examined its causes consequences. is mesotrophic drowned river mouth that drains Michigan's 2nd largest watershed into Michigan. A buoy observatory tracked ecosystem changes Area of Concern (AOC), gathering vital time-series data on lake's water quality from early summer through late fall 2011 to 2013 (www.gvsu.edu/buoy). Observatory-based measurements dissolved oxygen (DO)...
We report primary production and respiration of Posidonia oceanica meadows determined with the non-invasive aquatic eddy covariance technique. Oxygen fluxes were measured in late spring at an open-water meadow (300 m from shore), a nearshore (60 adjacent sand bed. Despite oligotrophic environment, highly productive autotrophic. Net ecosystem (54 to 119 mmol m-2 d-1) was about one-half gross production. In sands, net tenth- twentieth smaller (4.6 d-1). Thus, P. are oasis productivity...
Abstract The fragility of thin Clark‐type glass microelectrodes used in aquatic eddy covariance measurements benthic oxygen fluxes is a challenge when using this powerful technique. This study presents new fast‐responding dual oxygen‐temperature sensor for that far more robust. Response time tests the lab, where was inserted from air into water, revealed 90% response times 0.51 s and 0.34 temperature measurements, respectively. In wave tank tests, showed no stirring sensitivity contrast to...
Abstract. This study examined fluxes across the ice-water interface utilizing eddy correlation technique. Temperature systems were used to determine rates of ice melting and freezing, O2 examine exchange driven by biological physical processes. The was conducted below 0.7 m thick sea-ice in mid-March 2010 a southwest Greenland fjord revealed low melt at maximum 0.80 mm d−1. flux associated with release depleted water less than 13 % average daily respiration rate. Ice insufficient vertical...
Carbon capture and storage is a key mitigation strategy proposed for keeping the global temperature rise below 1.5 °C. Offshore can provide up to 13% of CO2 reduction required achieve Intergovernmental Panel on Climate Change goals. The public must be assured that potential leakages from reservoirs detected therefore safely contained. We conducted controlled release 675 kg within sediments at 120 m water depth, simulate leak test novel detection, quantification attribution approaches. show...
Abstract. Submarine groundwater discharge was quantified by a variety of methods for 4-day period during the early summer 2004, in Salt Pond, adjacent to Nauset Marsh, on Cape Cod, USA. Discharge estimates based radon and salinity took advantage presence narrow channel connecting Pond which allowed constructing whole-pond mass balances as water flowed out due tidal fluctuations. The data suggest that less than one quarter vicinity happened within pond itself, while three quarters or more...
Environmental monitoring of offshore Carbon Capture and Storage (CCS) complexes requires robust methodologies cost-effective tools to detect, attribute quantify CO2 leakage in the unlikely event it occurs from a sub-seafloor reservoir. Various approaches can be utilised for environmental CCS monitoring, but their capabilities are often undemonstrated more detailed strategies need developed. We tested compared different an setting using release experiment conducted at 120 m water depth...
We present a novel approach to detecting and quantifying subsea release of CO2 from within North Sea sediments, which mimicked leak reservoir. Autonomous lab-on-chip sensors performed in situ measurements pH at two heights above the seafloor. During 11 day experiment rate was gradually increased. Whenever currents carried CO2-enriched water towards sensors, measured decrease pH, with strong vertical gradient metre At highest rate, over 0.6 units observed 17 cm seafloor compared background...
Abstract We quantified oxygen flux in a coastal stream Virginia using novel combination of the conventional open water technique and aquatic eddy covariance technique. The latter has smaller footprint (sediment surface area that contributes to flux; ∼ 10 m 2 ), allowing measurements be made at multiple sites within (∼ 1000 ). Sites included an unvegetated pool with cohesive sediment, macrophyte bed sandy sand rippled bedforms. Nighttime uptake was always than produced by At sites, nighttime...
We detected a controlled release of CO2 (g) with pH eddy covariance. quantified emission using measurements water velocity and in the plume aqueous generated by bubble streams, model predictions vertical dissolution its dispersion downstream. was injected 3 m below floor North Sea at rates 5.7–143 kg d − 1. Instruments were 2.6 from center streams. In absence CO2, covariance proton flux due to naturally-occurring benthic organic matter mineralization (equivalent dissolved inorganic carbon...
According to many prognostic scenarios by the Intergovernmental Panel on Climate Change (IPCC), a scaling-up of carbon dioxide (CO2) capture and storage (CCS) several orders-of-magnitude is necessary meet target ≤2 °C global warming 2100 relative preindustrial levels. Since large fraction predicted CO2 capacity lies offshore, there pressing need develop field-tested methods detect quantify potential leaks in marine environment. Here, we combine field measurements with numerical models...
A new seepage meter design that increases sensitivity to the small hydraulic gradients drive submarine groundwater discharge was developed as an inexpensive alternative traditional meters. The replaces bags with open‐ended tubing through which displacement of injected dye is a highly reproducible measure discharge. Laboratory measurements, detailed mathematical modeling flow around meters, and parallel field tests bag meters demonstrated can improve precision temporal resolution measurement....
Abstract. We investigated light, water velocity, and CO2 as drivers of primary production in Mediterranean seagrass (Posidonia oceanica) meadows neighboring bare sands using the aquatic eddy covariance technique. Study locations included an open-water meadow a nearshore meadow, being exposed to greater hydrodynamic exchange. A third was located at vent. found that, despite oligotrophic environment, had remarkably high metabolic activity, up 20 times higher than surrounding sands. They were...
The Neuse River Estuary in North Carolina has suffered impacts of eutrophication recent years. As part a larger project to better constrain nutrient budgets the estuary, field investigations were performed study occurrence and discharge fresh brackish ground water nutrients beneath estuary itself (fig. 1). A Continuous Resistivity Profiling (CRP) system (Manheim others, 2004) was used map depth freshwater-saltwater interface (FSI) sub-estuarine groundwater. This area serves as typological...
Oxygen depletion in bottom waters of lakes and coastal regions is expanding worldwide. To examine the causes hypoxia, we quantified drivers benthic oxygen uptake Green Bay, Lake Michigan, USA, using 2 techniques, aquatic eddy covariance sediment core incubation. We investigated along a gradient C deposition, including shallow water near riverine source eutrophication deeper lower Bay where high net deposition occurs. Time-averaged was (11.5 mmol m−2 d−1) at shallower sites (9.8 d−1). The...
Abstract. This study uses the eddy correlation technique to examine fluxes across ice-water interface. Temperature systems were used determine rates of ice melting and freezing, O2 exchange as driven by biological physical processes. The research was conducted below 0.7 m thick sea in mid March 2010 a southwest Greenland fjord revealed low average melt amounting maximum 0.80 ± 0.09 mm d−1 (SE, n=31). corresponding calculated flux associated with release depleted water less than 13 % daily...
Calcifying organisms, including scleractinian corals and coralline algae, play a pivotal role in supporting benthic habitats their associated ecosystem functions. However, many of them are threatened by ocean warming acidification caused anthropogenic CO2 emissions. Our understanding capacity to adapt changes natural environment remains limited. To address this knowledge gap, we introduce non-invasive method quantify calcification from the simultaneous measurement H+ ion O2 fluxes utilizing...