{
    "platform": {
        "comment": "", 
        "model_vocabulary": "http://vocab.nerc.ac.uk/collection/B76/current/B7600001/", 
        "maker_vocabulary": "http://vocab.nerc.ac.uk/collection/L35/current/MAN0020/,http://vocab.nerc.ac.uk/collection/B75/current/ORG01077/", 
        "description": "A long-range autonomous underwater vehicle (AUV) based on buoyancy. It is used for remote water column sampling. It uses hydraulic buoyancy change to alter the vehicle density in relation to the surrounding water thereby causing the vehicle to either float or sink. Given an appropriate dive or climb angle, the wings and body lift and convert some of this vertical motion into a forward saw tooth horizontal motion. Periodically, the glider surfaces and calls via Iridium Satellite Phone (anywhere in world) or Free Wave RF Modem (line of sight) in to Dockserver (auto attendant computer) to relay navigational fix, data and receive further instructions for command and control. The glider is capable of storm sampling and can be flown in a coordinated fleet. It is 1.5 m in length, has a hull diameter of 22 cm and mass of 54 kgs. It has an exchangeable payload (capacity up to 6 L) which is capable of housing a variety of environmental sensors such as nitrate and oxygen. It uses lithium or alkaline batteries. It has a deployment range of 600-6000 km, a deployment length of 15 days to 12 months and an operating depth range of 4-1000m. Navigation is via GPS waypoints, a pressure and altimeter sensor. Maximum speed is .35 m/s. It transmits via RF modem, Iridium (RUDICS), ARGOS or acoustic modem.", 
        "instruments": "instrument_ctd,instrument_pH,instrument_flbbcdslc,instrument_optode", 
        "long_name": "um_242 Slocum G2", 
        "owner": "University of Maine", 
        "type_vocabulary": "http://vocab.nerc.ac.uk/collection/L06/current/27/", 
        "id": "um_242", 
        "depth_rating": "350m", 
        "wmo_platform_code": "4802997", 
        "os_version": "8.5", 
        "wmo_id": "4802997", 
        "serial_number": "242", 
        "model": "Teledyne Webb Research Slocum G2 glider", 
        "type": "sub-surface gliders", 
        "maker": "Teledyne Webb Research"
    }, 
    "global_attributes": {
        "comment": "Deployed by Robert Prescott and John Wallinga aboard Osprey out of Bar Harbor, ME.", 
        "contributor_name": "Neal Pettigrew,Robert Prescott,John Kerfoot,Laura Nazzaro,Lori Garzio", 
        "acknowledgment": "This deployment is supported by the NOAA Ocean Acidification Program and U.S. Integrated Ocean Observing System", 
        "sea_name": "Gulf of Maine", 
        "deployment": "um_242-20230803T1952", 
        "summary": "This project is conducting seasonal deployments to investigate carbonate chemistry and monitor ocean acidification in the Gulf of Maine. The glider used for the automated observation includes an integrated deep rated version of the Ion Sensitive Field Effect Transistor (ISFET)-based pH sensor. The pH sensor unit is complemented with existing glider sensors including a CTD, a WETLabs FLBBCD ECO puck configured for simultaneous chlorophyll fluorescence and optical backscatter measurements, and an Aanderaa Optode for measuring dissolved oxygen. The real-time dataset contains CTD, chlorophyll a, CDOM and optical backscatter measurements. Dissolved oxygen and pH data will be processed post-deployment.", 
        "project": "NOAA OAP (Ocean Acidification Program)/IOOS, Sustained Underwater Glider Observations for Improving Atlantic Tropical Cyclone Intensity Forecast", 
        "cdm_data_type": "Trajectory", 
        "program": "Collaborative Research - Optimizing Ocean Acidification Observations for Model Parameterization in the Coupled Slope Water System of the U.S. Northeast Large Marine Ecosystem, Sustained Underwater Glider Observations for Improving Atlantic Tropical Cyclone Intensity Forecast - AOML/OAR", 
        "references": "https://umaine.edu/marine/research/ocean-observing-systems/,https://rucool.marine.rutgers.edu/data/underwater-gliders/", 
        "contributor_role": "Principal Investigator,Glider Pilot,Data Management,Data Management,Data Management", 
        "wmo_id": "4802997", 
        "wmo_platform_code": "4802997", 
        "gts_ingest": "True", 
        "institution": "University of Maine"
    }, 
    "trajectory_name": "um_242-20230803T1952", 
    "glider": "um_242"
}