The Collaborative O-Buoy Project: O-Buoy Deployment Campbell ("met")
Contact: Patricia Matrai, pmatrai@bigelow.org, 202-747-3255

Data files are named by year and day of year covered. The data files are comprised of meterological observations with following columns [units].  The file format and units are described at http://www.unidata.ucar.edu/software/idv/docs/userguide/data/TextPointData.html 

Final met data report the following headers:

Time[fmt="yyyy-MM-dd HH:mm:ss z"],Latitude[unit="deg"],Longitude[unit="deg"],temp[unit="Celsius"],rh[unit="percent"],winddir[unit="degree"],windspd[unit="m/s"],press[unit="mbar"]

Level 1 data have the following headers:

Buoy 1:
Time[fmt="yyyy-MM-dd HH:mm:ss z"],Latitude[unit="deg"],Longitude[unit="deg"],elapsed_time[unit="seconds"],temp[unit="Celsius"],rh[unit="percent"],press[unit="mbar"],windspd[unit="m/s"],winddir[unit="degree"],heading[unit="degree"],pitch[unit="degree"],roll[unit="degree"],bat_temp_top[unit="Celsius"],bat_temp_mid[unit="Celsius"],bat_temp_bot[unit="Celsius"] 

All other buoys:
Time[fmt="yyyy-MM-dd HH:mm:ss z"],Latitude[unit="deg"],Longitude[unit="deg"],agm_voltage[unit="volt"],agm_current[unit="amp"],li_voltage[unit="volt"],li_current[unit="amp"],gps_current[unit="amp"],campbell_current[unit="amp"],iridium_current[unit="amp"],ozone_current[unit="amp"],doas_current[unit="amp"],co2_current[unit="amp"],sc_current[unit="amp"],temp[unit="Celsius"],rh[unit="percent"],winddir[unit="degree"],windspd[unit="m/s"],press[unit="mbar"],bat_temp_1[unit="Celsius"],bat_temp_2[unit="Celsius"],bat_temp_3[unit="Celsius"] 

Abbreviations:
temp - temperature
rh - relative humidity
winddir - wind direction
windspd - wind speed
press - atmospheric pressure

Data have some time periods masked according to list in "buoy-mask.csv" which is available by request.   In that file, "what" refers the instrumentation to be masked where "any" (or "all"), "co2", "gps", "met", "ozone", etc. t0 and t1 mark the start and end points of the masked periods.

The following buoy deployments have final met data posted on ACADIS:
O-buoy1 2009-2010
O-buoy2 2010-2011(Data from 2010-11 through 2011-03 are limited due to buoy power issues)
O-buoy3 2010-2011 (2011-malfunctioned wind unit)
O-buoy4 2010-2012
O-buoy5 2011-2012 (2012-data limited because of general buoy power failure)
O-buoy6 2012
O-buoy7 2012-2013
O-buoy8 2012-2013

All other data are unfiltered, level 1 data, unless metadata states otherwise. Final data will be fully populated and deposited at the end of each deployment.


*Wind direction data correction for final data*

Because the sonic anemometer collects wind direction data relative to orientation of the O-buoy, wind direction data must be corrected.  Level 1 data have not yet been corrected.  Final have been corrected.

The following generic equation was used for correcting wind data:
Equation 1: T = R + A

T = true wind direction (degrees)
R = raw wind direction (degrees) from the O-buoy anemometer
A = O-buoy azimuth angle (degrees) from GPS data files (value is under column labeled "Course")

Note: if T > 360 degrees, 
Equation 2: T = T - 360

Note: Because wind direction data is collected at a higher frequency than GPS data, the azimuth data was linearly interpolated before the wind direction data was corrected.  

Exceptions to the above wind direction corrections:
*O-buoy 1 (2009/02 - 2009/05): The buoy was stationary throughout this deployment.  True wind direction was obtained by subtracting 21 degrees from the raw wind direction value.
*O-buoy 4 (2011/09 - 2012/08): The anemometer on this buoy was installed backwards, offsetting measurements by 180 degrees.  The generic correction equation (Equation 1) for this buoy becomes:
Equation 3: T = R + A + 180


readme version: 2014-10-27