NERACOOS Gulf of Maine Buoys Measurement Descriptions for Text Reports
Physical
Oceanography
Group
School of Marine Sciences University of Maine |

** Measurement descriptions for GoMOOS Buoy Text Reports **

There are 3 lines of header data at the beginning of each file which contain the
type of measurement, units of measurement, and depth of the measurement (a negative depth
refers to height above the surface). The first 5 variables on each data record are the
year (yy), month (MM), day (DD), hour (hh), and minute (mm) of the observation
(center of observation period). All times are in UTC.

Measurement interval ranges from every 10 minutes to hourly and are listed below. As of April 2008, most buoys have been converted to sample surface met data every 10 minutes; waves and 1m temperature/salinity are sampled every 30 minutes. Ocean currents and sub-surface temperature/salinity measurements are sampled hourly.

An additional note is that these data are assembled from both satellite and cellphone sources. The Goes data only include the hourly data - if a buoy is experiencing phone problems, the data may only be hourly. Buoys M01 and N01 are particularly affected since their primary communication method is Goes (irridium phone transfers nominally every 8 hours). When the buoy completes a phone call, the higher frequency data will be retroactively filled in.

Measurement | Interval | Sample Period | Sample Frequency | Description |
---|---|---|---|---|

WDIR | 10 or 30 min | 8 min | 1 hz | Wind direction (the direction the wind is coming from in degrees clockwise from true north). |

WSPD | 10 or 30 min | 8 min | 1 hz | Wind speed. |

GST | 10 or 30 min | 8 min | 0.2 hz | Peak 5 second gust measured during the eight-minute period. |

WVHT | 30 min | 17 min | 2 hz | Significant wave height is calculated as the average of the highest one-third of all the wave heights during the 17-minute sampling period. |

DPD | 30 min | 17 min | 2 hz | Dominant wave period is the period with the maximum wave energy. |

PRES | 10 or 30 min | 8 min | 1 hz | Barometric pressure. |

PTDY | 10 or 30 min | - | - | Pressure tendency is the direction (plus or minus) and the amount of pressure change for a three hour period ending at the time of observation. |

ATMP | 10 or 30 min | 8 min | 0.125 hz | Air temperature. |

VIS | 10 or 30 min | 8 min | 1 hz | Visibility (range 0-3 km). |

WTMP | 30 or 60 min | - | 1 sample | Ocean temperature. |

SAL | 30 or 60 min | - | 1 sample | Ocean salinity. |

CSPD | 60 min | 1 min | 10 hz | The speed of the ocean current. |

CDIR | 60 min | 1 min | 10 hz | The direction that the ocean current is flowing toward. 0-360 degrees, 360 is due north. |

Measurement | Interval | Sample Period | Sample Frequency | Description |
---|---|---|---|---|

WTMP | 30 or 60 min | - | 1 sample | Ocean temperature. |

SAL | 30 or 60 min | - | 1 sample | Ocean salinity. |

SIGT | 30 or 60 min | - | 1 sample | Ocean sigma-t. |

O2 | 60 min | - | 1 sample | Ocean dissolved oxygen. |

SAL | 60 min | - | 1 sample | Ocean oxygen percent saturation. |

CLCON | 60 min | 1 min | 1 hz | Ocean chlorophyll. |

TURB | 60 min | 1 min | 1 hz | Ocean turbidity. |

CDOM | 60 min | 1 min | 1 hz | Ocean cdom fluorescence. |

Measurement | Interval | Sample Period | Sample Frequency | Description |
---|---|---|---|---|

CSPD (2m) | 60 min | 1 min | 10 hz | Ocean current speed. |

CSPD ( > 4m) | 60 min | 8 min | 0.125 hz | Ocean current speed. |

CDIR | 60 min | (same as CSPD) | (same as CSPD) | The direction that the ocean current is flowing toward. 0-360 degrees. 360 is true north. |

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