A5009819067- Methane Hydrates and Related Phenomena
- Underwater Vehicles and Communication Systems
- Underwater Acoustics Research
- Arctic and Antarctic ice dynamics
- Marine animal studies overview
- Climate change and permafrost
- Atmospheric and Environmental Gas Dynamics
- Marine and coastal ecosystems
- Marine Bivalve and Aquaculture Studies
- Marine and fisheries research
- Marine and coastal plant biology
- Maritime Navigation and Safety
- Cryospheric studies and observations
- Advanced Chemical Sensor Technologies
- Analytical Chemistry and Sensors
- Ocean Acidification Effects and Responses
- Marine Biology and Ecology Research
- Marine Toxins and Detection Methods
Woods Hole Oceanographic Institution
2014-2024
University of Washington Applied Physics Laboratory
2024
This paper illustrates the components, capabilities, and some characteristic applications of Woods Hole Oceanographic Institution Jetyak - a small autonomous surface vehicle (ASV) designed for collection oceanographic data from shallow or dangerous waters. The is result custom modifications to Mokai jet-powered kayak, including an A-frame sea chest installation instrumentation, servo-driven controls Ardupilot autopilot operation, onboard computer instrument control logging, radios wireless...
Abstract We present a year‐round time series of dissolved methane (CH 4 ), along with targeted observations during ice melt CH and carbon dioxide (CO 2 ) in river estuary adjacent to Cambridge Bay, Nunavut, Canada. During the freshet, concentrations ice‐covered were up 240,000% saturation 19,000% saturation, respectively, but quickly dropped by >100‐fold following melt. Observations robotic kayak revealed that river‐derived CO transported rapidly ventilated atmosphere once cover...
Coastal ecosystems host high levels of primary productivity leading to exceptionally dynamic elemental cycling in both water and sediments. In such environments, carbon is rapidly cycled rates burial as organic matter and/or loss the atmosphere laterally coastal ocean simpler forms, dioxide (CO2) methane (CH4). To better understand across these heterogeneous new technologies beyond discrete sample collection analysis are needed characterize spatial temporal variability. Here, we describe...
Reactive oxygen species (ROS) are produced via various photochemical, abiotic, and biological pathways. The low concentration short lifetime of the ROS superoxide (O2•–) make it challenging to measure in natural systems. Here, we designed, developed, validated a DIver-operated Submersible Chemiluminescent sensOr (DISCO), first handheld submersible chemiluminescent sensor. fluidic system inside DISCO is controlled by two high-precision pumps that introduce sample water analytical reagents...
The 2021 collaborative Sea Ice Dynamics Experiment (SIDEx'21) was conducted in March and April on an ice floe the Beaufort included comprehensive instrumentation measurement of during spring breakup. Part this sensing suite extensive network seismo-acoustic sensors deployed at a multiyear/first-year boundary with hydrophones under geophones top thicknesses ranging from one meter to five thickness. At center array cabled system 18 subarrays four three-axis spanning diamond minor axis 60 m...
Measurements of greenhouse gases in Arctic waters are strongly biased toward low-ice summer conditions, with few observations during periods seasonal ice retreat. We present a year-round time series dissolved methane (CH4) and nitrous oxide (N2O), along targeted melt CH4 carbon dioxide (CO2) river estuary adjacent to Cambridge Bay, Nunavut, Canada. displayed dramatic seasonality, contrast limited changes N2O. During the freshet, concentrations ice-covered were up 240,000% saturation 19,000%...
The steady rise in global temperature is likely to perturb the cycling and transfer of carbon coastal Arctic. Given high content Arctic soils, this region may become an increasingly important source methane (CH4) dioxide (CO2) response permafrost loss coming decades. We present targeted observations along a lake bay system during spring thaw around Cambridge Bay, Canadian In system, greenhouse gases produced freshwater environment are transported bay, where they undergo further transport,...
To increase production of seaweed to the point where it is economically viable as a biofuel, many developments are required in areas such breeding and offshore farming systems. inform decision making by farmers, maps features that describe farm infrastructure, growth seaweed, fish populations needed. As part Advanced Research Projects Agency-Energy (ARPA-E) MARINER (Macroalgae Inspiring Novel Energy Resources) program, acoustic systems being assessed for quantitative autonomous mapping....
A series of data collections have been undertaken in Weymouth Fore River, Massachusetts, to characterize acoustic propagation one enclosed basin. The goal the work was obtain describe sound basin, and calibrate modeling systems for within ports harbors. An ability accurately model these environments would inform future system design deployment. Both monostatic bistatic were used field work. main are from a (monostatic) bathymetric sonar, composed moored stationary receivers mobile sources....
Sargassum blooms have been causing significant ecological and economic damage to coastal regions in the Northern Equatorial Atlantic since 2011. To better understand movement effects of this macroalgae, there is a need track its transport. In study, low-cost drifter was deployed, designed entangle with aid tracking. The design based on results twenty-seven designs five days field trials. tracking data validated using gridded wind current products, as well high resolution satellite imagery....
Since 2011, Sargassum, a free-floating macroalgae, has been causing significant ecological and economic damage to coastal regions in the Northern Equatorial Atlantic due its voluminous blooms. To better understand fate effects of approaches are needed track transport. Here we developed low-cost drifter, designed entangle with aid tracking providing situ movement data ground-truth models supplementing gaps satellite imaging. The results 27 drifter designs five days field trials presented....
Constrained underwater spaces such as harbors and ports present many interesting acoustic features challenges. Quays, wharves, seawalls, ships, floats, bridge piers, jetties, are often part of the “scenery.” Passive active security systems used in these settings. Our focus is on how communications between system modems affected by reflectors. The evidence mainly anecdotal, but there a concern that complexity environment can be bad for communications, just convention center room have lousy...
A growing application for unmanned vehicle technology is the localization, classification and mitigation of underwater hazards such as munitions in shallow harbor environments. Because visual inspection targets can be difficult or impossible murky harbors requires precise target acoustic sensors sidescan sonar synthetic aperture (SAS) are used more extensively munition detection missions. While these techniques provide rich images environment, postprocessing often required themselves too...
Data has been collected on two field days to characterize underwater acoustic conditions in small shallow-water spaces the Fall River Harbor area of Taunton River, MA. This work is part a project develop sound characterization and modeling capabilities for constrained spaces. First, bathymetric sonar from an uncrewed surface platform was used accurately measure seabed boundary contours. Next, point-to-point propagation characteristics were measured, including data transmission throughput....