Physical Oceanography Group (PhOG), School of Marine Sciences, University of Maine
The University of Maine / School of Marine Sciences
Physical Oceanography Group
Dr. Neal Pettigrew
Physical Oceanography Group (PhOG), 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.



Surface Data
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.


Ocean Data
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.


Current Data
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.