Upper Ocean Mooring Data Archive - Meteorological Specifications

Vector Averaging Wind Recorder (VAWR) Sensor Specifications

Parameter	Sensor Type	Nominal Accuracy	Sampling
Air temperature	Thermistor Yellow Springs #44034 5K @ 25°C	±0.2°C when wind > 5ms^-1	1.875 min average^a
Relative humidity	Variable Dielectric Conductor Vaisala Humicap 0062HM	±2% RH	3.515 sec burst sample^b
Barometric pressure	Quartz crystal Digiquartz Paroscientific Model 215, 216	±0.2mbar when wind < 20ms^-1	2.636 sec burst sample^b
Wind speed	3 cup anemometer R.M. Young	>±2% above 0.7ms^-1	7.5 min vector averaged^c
Wind direction	Integral vane w/ vane follower WHOI / EG&G	±5.6°	7.5 min vector averaged
Short-wave radiation	Pyranometer Eppley 8-48	±3% of value	>7.5 min average
Long-wave radiation		±10%
Thermopile	Pyrgeometer Eppley PIR		7.5 min average
Body Temperature	Thermistor 10K @ 25°C		1.875 min average^d
Dome Temperature	Thermistor 10K @ 25°C		1.875 min average^e
Sea temperature	Thermistor Thermometrics 4K @ 25°C	±0.005°C	1.875 min average^f

^a Air temperature is measured during the second quarter of the sampling interval for one quarter of the record time.
^b Relative humidity and barometric pressure are burst samples taken in the middle of the sampling interval.
^c Overestimation of wind speed by about 5% is characteristic of cup anemometers.
^d Long-wave radiation body temperature is measured during the third quarter of the sampling interval for one quarter of the record time.
^e Long-wave radiation dome temperature is measured during the fourth quarter of the sampling interval for one quarter of the record time.
^f Sea temperature is measured during the first quarter of the sampling interval for one quarter of the record time.

IMET Sensor Specifications

Parameter	Sensor Type	Nominal Accuracy	Sampling
Air temperature	Platinum Resistance Thermometer	±0.25°C	Burst sample every 1 min
Relative humidity	Rotronic MP-100F	±3% RH	Burst sample every 1 min
Barometric pressure	Quartz crystal AIR DB-1A	±0.5mbar	Burst sample every 1 min
Wind speed	Wind monitor R.M. Young Model 5103	±2%	1 min average^a,b
>Wind direction	Wind monitor R.M. Young Model 5103	±1.5°	1 min average^a
Short-wave radiation	Temperature compensated Thermopile Eppley PSP	±3% of value	1 min average^c
Long-wave radiation	Pyrgeometer Eppley PIR	±10%	Burst sample every 1 min
Sea temperature	Platinum Resistance Thermometer	±0.005°C	Burst sample every 1 min
Precipitation	Self-siphoning rain gauge R.M. Young Model 50201	±10%	Burst sample every 1 min
Aspirated air temperature	Platinum Resistance Thermometer with R. M. Young Aspirated Shield Model 43408	±0.2°C when short-wave < 1080 W m^-2	Burst sample every 1 min

^a The vane on the wind module is sampled at one second intervals and averaged over 15 seconds. The compass is sampled every 15 seconds and the wind speed is averaged every 15 seconds. East and north components are computed every 15 seconds. Once a minute the logger stores average east and north components computed from the most recent four 15 second averages.
^b Underestimation of wind speed by about 3% is characteristic of propeller anemometers.
^c Short-wave radiation is sampled every 10 seconds and the average of the six most recent samples is logged.

Last updated: March 16, 2008