Axial Base (PN3A) Medium-Power (MP) J-box

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1 Axial Base (PN3A) Medium-Power (MP) J-box Location: 46.1 N, W Depth of Water Column: 2654 m This node supports geophysical instruments at the base of Axial Seamount. Instrument Name/Description Data Products Relative Depth Pressure sensor on seafloor, tidal Seafloor pressure, tides Low Frequency Broadband (Passive) Acoustic Receiver (Hydrophone) on seafloor Broadband seismometer for global/regional seismic activity Measures wind, rain, and seismic t-phases Broadband ground velocity and acceleration measuring ground acceleration in 3 orthogonal directions. Used to measure global/regional seismic events and harmonic tremors.

2 Shallow Profiler - Winched Location: within 3 km of 46.1 N, W Instrument Name/Description Data Products Relative Depth* (m) 3-Wavelength Fluorometer Fluorometric Chlorophyll-a Concentration, Optical backscatter (red wavelengths), Fluorometric CDOM concentration Seawater CO 2 Partial Pressure Photosynthetically Active Radiation (PAR) Spectral Irradiance Optical absorption of IR by CO 2 ; pco 2 seawater Photosynthetically Active Radiation (PAR) Downwelling spectral irradiance, Diffuse Attenuation Conductivity, Temperature, Pressure (Depth), Dissolved Oxygen Oxygen concentration Optical nitrate Nitrate concentration Seawater ph Optical absorption of IR; ph Spectrophotometer for optical attenuation and absorption measurements Optical attenuation, and absorption *Shallow profiler, equipped with listed instruments, moves through water column over specified depth interval. Near sea surface is operationally defined as 3 times wave height.

3 m Platform Location: within 3 km of 46.1 N, W Instrument Name/Description Data Products Relative Depth (m) Velocity profiler (short range) Ethernet Camera with strobes Acoustic backscatter, Velocity profiles Digital still images of water column biology, vents, diffuse flow, seeps, macrofauna Mounted at measures up to surface 5-Beam 600 khz Acoustic Doppler Current Profiler ( 50 m range) Turbulent velocity profiles, Acoustic backscatter, Orientation (pitch, roll, heading) Mounted at, uplooking Broadband (Passive) Acoustic Receiver (Hydrophone) Measures marine mammals, fish, wind, and rain Dissolved Oxygen Oxygen concentration 2-Wavelength Fluorometer Chlorophyll-a fluorescence, Optical backscatter (red wavelengths) Seawater ph Optical absorption of IR; ph

4 Deep Profiler Wire Following Location: within 2 km of 46.1 N, W Instrument Name/Description Data Products Relative Depth* (m) Dissolved Oxygen Oxygen concentration Spectrophotometer for optical attenuation and absorption measurements Optical attenuation and absorption 3-Wavelength Fluorometer Fluorometric Chlorophyll-a Concentration, Optical backscatter (red wavelengths), Fluorometric CDOM concentration *Deep profiler, equipped with listed instruments, moves through water column over specified depth interval.

5 Low-Power (LP) J-Box Location: 46.1 N, W This node supports seafloor instruments associated with mooring infrastructure Instrument Name/Description Data Products Relative Depth Velocity profiler (short range) Broadband (Passive) Acoustic Receiver (Hydrophone) Horizontal electric field and pressure inverted echo sounder (HPIES) Acoustic backscatter, Velocity profiles Measuring marine mammal, fish, wind, and rain Roundtrip Acoustic Travel Time (RATT), pressure, Horizontal electric fields, Vertically Averaged Horizontal Water Velocity (VAHWV), water property profile time series, water column heat content 300 m range Dissolved Oxygen Oxygen concentration Spectrophotometer for optical attenuation and absorption measurements Optical attenuation and absorption

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