eLXg {bNX: Information of Sensors on JKEO1

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The sensors on JKEO1 are as same as on the KEO. The following description is based on that in KEO web site.

The table below identifies the types of sensors used on JKEO1 moorings and lists their specifications. Most instrumental accuracies listed are based on historical pre-deployment and post-recovery calibrations and are the root mean square drift of a group of sensors. References where available are indicated by [#] in the comments column and listed at the end of the tables. Accuracies of sensors which have not been evaluated by the JKEO1, KEO or TAO project offices (i.e. longwave radiation, wind speed and direction, water pressure) are those specified by the manufacturer and are indicated by [M].

In cases where sensors are paired with PMEL supplied electronics (e.g., analog to digital boards) calibrations include both the sensor and PMEL electronics. Accuracies listed here (with the exception of currents) do not include environmental factors such as wind (on rainfall) or buoy motion (on radiation). Measurement ranges listed are generally those over which the sensors are calibrated. The ranges over which a sensor will operate (determined by the sensor and/or PMEL electronics) are listed in parenthesis if they significantly exceed the calibration range.

Last updated on December 26, 2008


Sensor type

Manufacturer: Model #





Wind speed


Gill WindSonic

0.01 m s-1

0-60 m s-1



Wind direction

Fluxgate compass

E.G.and G. or KVH: 63764 or LP101-5



5 - 7.8




Gill WindSonic





Air temperature

Pt-100 RTD (Resistance Temperature Recorder)

Rotronic Instrument Corp.: MP-100






Relative humidity


0.4 %RH realtime

0.02 %RH delay mode

55-95 %RH

(0-100 %RH)

}2.7 %RH




R. M. Young: 50203-34

0.2 mm hr-1

0-50 mm

}0.4 mm hr-1 on 10 min filtered data


Downwelling shortwave radiation


Eppley Laboratory: PSP-TAO, Delrin case

0.4 W m-2

200-1000 W m-2

(0-1600 W m-2)


[M] Evaluation underway

Downwelling longwave radiation


Eppley Laboratory: PIR-TAO, Delrin case, 3-output (1)

0.1 W m-2


200 W m-2

@ 20C (thermopile only)


[M] Nominal calibration values used for case and dome thermistors

Sea surface and subsurface temperature


PMEL: NX ATLAS using YSI (Yellow Springs Instruments) thermistor 46006





[9] Evaluation of accuracy underway


Internal field conductivity cell

Sea Bird Electronics: SBE16 (Seacat)

0.0001 S m-1

3-6 S m-1

(0-6 S m-1)

}0.02 psu

[3] Based on SBE16 only. SBE37 assumed comparable.

Accuracy of ATLAS module under evaluation

SBE37 (Microcat)

0.00001 S m-1

Sea Bird cell with ATLAS module

0.002 S m-1

Water pressure


Paine: 211-30-660-01

0.03 psi

400-800 psi

(0-1000 psi)

}0.25% full scale (1000psi)


Ocean current

Doppler Current Meter

SonTek: Argonaut MD 1.5 MHz





Note: ATLAS = Automated Temperature Line Aquisition Systerm


[1] Fairall, C. W., P. O. G. Persson, E.F. Bradley, R. E. Payne and S. P. Anderson, 1998: A new look at calibration and use of Eppley Precision Radiometers. Part I: Theory and Application. J. Atmos. Ocean. Tech., 15, 1229-1242.

[2] Freitag, H.P., Y. Feng, L.J. Mangum, M.J. McPhaden, J. Neander, and L.D. Stratton, 1994: Calibration procedures and instrumental accuracy estimates of TAO temperature, relative humidity and radiation measurements. NOAA Tech. Memo. ERL PMEL-104, 32 pp.

[3] Freitag, H.P., M.E. McCarty, C. Nosse, R. Lukas, M.J. McPhaden, and M.F. Cronin, 1999: COARE Seacat data: Calibrations and quality control procedures. NOAA Tech. Memo. ERL PMEL-115, 89 pp.

[4] Halpern, D., 1987: Comparison of upper ocean VACM and VMCM observations in the equatorial Pacific. J. Atmos. Ocean. Tech., 4, 84-93.

[5] Plimpton, P.E., H.P. Freitag, and M.J. McPhaden, 1995: Correcting moored ADCP data for fish-bias errors at 0,110W and 0,140W from 1990 to 1993. NOAA Tech. Memo. ERL PMEL-107, 49 pp.

[6] Serra, Y.L., P.A'Hearn, H.P. Freitag, and M.J. McPhaden, 2001: ATLAS self-siphoning rain gauge error estimates. J. Atmos. Ocean. Tech.,18, 1989-2002.

[7] Freitag, H.P., M. O'Haleck, G.C. Thomas, and M.J. McPhaden, 2001: Calibration procedures and instrumental accuracies for ATLAS wind measurements. NOAA. Tech. Memo. OAR PMEL-119, NOAA/Pacific Marine Environmental Laboratory, Seattle, Washington, 20 pp.

[8] McCarty, M.E., and M.J. McPhaden, 1993: Mean seasonal cycles and interannual variations at 0, 165E during 1986-1992. NOAA Tech. Memo. ERL PMEL-98, 64pp.

[9] A'Hearn, P.N., H.P. Freitag, and M.J. McPhaden, 2002: ATLAS module temperature bias due to solar heating. NOAA Tech. Memo OAR PMEL-121, NOAA/Pacific Marine Environmental Laboratory, Seattle, WA, 24 pp.

[10] Freitag, H.P., M.J. McPhaden, C.Meinig, and P.Plimpton, 2003: Mooring motion bias of point Doppler current meter measurements. In: Proceedings of the IEEE Seventh Working Conference on Current Measurement Technology, San Diego, CA, 13-15 March 2003, IEEE, Piscataway, NJ, 155-160.

[11] Plimpton, P.E., H.P. Freitag, and M.J. McPhaden, 2004: Processing of subsurface ADCP data in the equatorial Pacific. NOAA Tech. Memo OAR PMEL-125, NOAA/Pacific Marine Environmental Laboratory, Seattle, WA. 41pp.

[12] Lake, B.J., S.M. Noor, H.P. Freitag, and M.J. McPhaden, 2003: Calibration procedures and instrumental accuracy estimates of ATLAS air temperature and relative humidity measurements. NOAA Tech. Memo. OAR PMEL-123, NOAA/Pacific Marine Environmental Laboratory, Seattle, WA, 23 pp

[13] Payne, R.E., K. Huang, R.A. Weller, H.P. Freitag, M.F. Cronin, M.J. McPhaden, C. Meinig, Y. Kuroda, N. Ushijima, R.M. Reynolds, 2002: A comparison of buoy meteorological systems. WHOI Technical Report
WHOI-2002-10. Woods Hole Oceanographic Institution, 67 pp.


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Kuroshio Transport and Surface Flux Group,

Ocean General Circulation Observational Research Program,

Institute of Observational Research for Global Change (IORGC),

Japan Agency for Marine-Earth Science and Technology (JAMSTEC)

2-15 Natsushima-cho Yokosuka-city,Kanagawa, 237-0061, Japan

JKEO web master