MIRAI MR02-K03 Expendable Bathythermograph (XBT)

Last Modified: 2019-09-28
: MR02-K03
: Processed (DMO)-QCed
: JAMSTEC
: Depth, Temperature
:
OCEANS > OCEAN TEMPERATURE > WATER TEMPERATURE

For Using Data

Data Management Office
See Terms and Conditions about constrain of use.
See Terms and Conditions about data citation.
Instrument:
Expendable bathythermograph (XBT) ( - MR11-E02)
Using XBT (eXpendable Bathy Thermograph) system, the vertical distribution of water temperature is observed during free fall of its probe part in the seawater. On board, the analogue signal is converted to the temperature by data processor and the data is stored in PC. Depth data is calculated from the elapsed time.

(1) Launcher
Hand launcher
Manufacturer : Sippican,Inc.
Operation area : Rear upper deck

Automatic launcher
Manufacturer : Tsurumi Seiki Co., LTD.
Location : Port side of rear upper deck (4m from the sea level). The control panel is installed in the investigation room.

(2) Converter
Manufacturer : Tsurumi Seiki Co., LTD.
Location : Investigation room
Sampling rate : 50 msec

(3) XBT probe specifications
Probe Type TSK T-5 TSK T-6 TSK T-7 TSK T-10
Temperature range [deg-C] -2 to 35
Temperature accuracy [deg-C] +/- 0.2
Temperature resolution [deg-C] 0.01
Measurment depth [m] 1830 460 760 300
Depth accuracy [m] 5 or +/- 2% of depth; whichever is larger
Maximum elapsed time [sec] 291 73 123 48
Rated ship speed [knot] 6 15 15 10

Since XBT carries no pressure sensor, we need to estimate depth from the elapsed time. The fall-rate equation is as follows.

Z = at + 10E-3 * bt2

Where Z(m) is the depth and t(sec) is the elapsed time.

In addition, coefficients of the fall-rate equation are different by probe types.

Probe Type TSK T-5 TSK T-6 TSK T-7 TSK T-10
Coefficient-a 6.828 6.691 6.691 6.301
Coefficient-b -1.82 -2.25 -2.25 -2.16
* Coefficients listed above are supplied by Sippican, Inc., in USA.

The list of an XBT type used in each cast is as follows.

Cast name Probe Serial No. Probe Type Launcher Converter
200206032249 - T-5 Auto MK-30N
200206040021 - T-5 Auto MK-30N
200206040230 - T-5 Auto MK-30N
200206040418 - T-5 Auto MK-30N
200206040605 - T-5 Auto MK-30N
200206040745 - T-5 Auto MK-30N
200206040927 - T-5 Auto MK-30N
200206041113 - T-5 Auto MK-30N
200206041350 - T-5 Auto MK-30N
200206041439 - T-5 Auto MK-30N
200206041526 - T-5 Auto MK-30N
200206041614 - T-5 Auto MK-30N
200206041659 - T-5 Auto MK-30N
200206041750 - T-5 Auto MK-30N
200206041835 - T-5 Auto MK-30N
200206090209 - T-7 Auto MK-30N
200206091446 - T-7 Auto MK-30N
200206091612 - T-7 Auto MK-30N
200206091737 - T-7 Auto MK-30N
200206091858 - T-7 - MK-30N
200206092019 - T-7 Auto MK-30N
200206092145 - T-7 Auto MK-30N
200206100844 - T-7 Auto MK-30N
200206101003 - T-7 Auto MK-30N
200206101121 - T-7 - MK-30N
200206101237 - T-7 - MK-30N
200206130900 - T-7 - MK-30N
200206130932 - T-7 - MK-30N
200206131003 - T-7 - MK-30N
200206131034 - T-7 - MK-30N
200206131104 - T-7 - MK-30N
200206131136 - T-7 - MK-30N
200206131208 - T-7 - MK-30N
200206131239 - T-7 - MK-30N
200206131310 - T-7 - MK-30N
200206131344 - T-7 - MK-30N
200206131418 - T-7 - MK-30N
200206131452 - T-7 - MK-30N
200206131531 - T-7 - MK-30N
200206131606 - T-7 - MK-30N
200206131641 - T-7 - MK-30N
200206131715 - T-7 - MK-30N
200206131749 - T-7 - MK-30N
200206131823 - T-7 - MK-30N
200206131857 - T-7 - MK-30N
200206131932 - T-7 Auto MK-30N
200206132006 - T-7 Auto MK-30N
200206140617 - T-7 Auto MK-30N
200206140719 - T-7 Auto MK-30N
200206140818 - T-7 - MK-30N
200206140923 - T-7 Auto MK-30N
200206141027 - T-7 Auto MK-30N
200206141136 - T-7 - MK-30N
200206141236 - T-7 - MK-30N
200206141336 - T-7 - MK-30N
200206141434 - T-7 Auto MK-30N
200206141534 - T-7 Auto MK-30N
200206141636 - T-7 Auto MK-30N
200206141745 - T-7 Auto MK-30N
200206141844 - T-7 Auto MK-30N
200206141947 - T-7 Auto MK-30N
200206142053 - T-7 Auto MK-30N
200206142205 - T-7 - MK-30N
200206181253 - T-7 Auto MK-30N
200206181332 - T-7 Auto MK-30N
200206181428 - T-7 Auto MK-30N

(1) For sensor's stablility, values of less than 1 m for temperature are replaced by missing values, respectively, based on manufacturer's recommendation.

(2) Quality control
QCed data were added flag according to the NODC (National Oceanographic Data Center) quality control procedure.
1) The gradient check of adjacent depth data
2) The broad range check set up at given ocean space and depth
Please see the site of NODC of the following link for quality control procedure in detail.
In addition, an abnormal value is identified by a visual check, and the data after visual QC is released.
(1) It is reported that T-5 probes produced by Tsurumi Seiki Co. Ltd. (TSK T-5 probes) have a fall-rate bias. Please see the following about publication policy of XBT fall-rate bias correction data.
: MR02-K03
: Processed (DMO)-QCed
: JAMSTEC
: Depth, Temperature
:
OCEANS > OCEAN TEMPERATURE > WATER TEMPERATURE

Observation Map

  1. Clicking the icon displays a balloon with observation information.
  2. Then click the observation name, figures will be displayed.
Imagery reproduced from ...

Figures

Data List

File names
200206032249.dat
200206040021.dat
200206040230.dat
200206040418.dat
200206040605.dat
200206040745.dat
200206040927.dat
200206041113.dat
200206041350.dat
200206041439.dat
200206041526.dat
200206041614.dat
200206041659.dat
200206041750.dat
200206041835.dat
200206090209.dat
200206091446.dat
200206091612.dat
200206091737.dat
200206091858.dat
200206092019.dat
200206092145.dat
200206100844.dat
200206101003.dat
200206101121.dat
200206101237.dat
200206130900.dat
200206130932.dat
200206131003.dat
200206131034.dat
200206131104.dat
200206131136.dat
200206131208.dat
200206131239.dat
200206131310.dat
200206131344.dat
200206131418.dat
200206131452.dat
200206131531.dat
200206131606.dat
200206131641.dat
200206131715.dat
200206131749.dat
200206131823.dat
200206131857.dat
200206131932.dat
200206132006.dat
200206140617.dat
200206140719.dat
200206140818.dat
200206140923.dat
200206141027.dat
200206141136.dat
200206141236.dat
200206141336.dat
200206141434.dat
200206141534.dat
200206141636.dat
200206141745.dat
200206141844.dat
200206141947.dat
200206142053.dat
200206142205.dat
200206181253.dat
200206181332.dat
200206181428.dat
ex_read2.f (Sample Program)
Observation List
The list of observation is shown as follows.
Observation Time and Date Lat. [°] Lon. [°]
200206032249 2002-06-03 22:42 28.1310 129.8166
200206040021 2002-06-04 00:14 28.0173 129.9075
200206040230 2002-06-04 02:24 27.8338 129.9996
200206040418 2002-06-04 04:10 27.6953 130.0860
200206040605 2002-06-04 05:59 27.5526 130.1735
200206040745 2002-06-04 07:38 27.4126 130.2600
200206040927 2002-06-04 09:20 27.2728 130.3458
200206041113 2002-06-04 11:07 27.1340 130.4336
200206041350 2002-06-04 13:44 26.9968 130.5175
200206041439 2002-06-04 14:32 26.8588 130.6045
200206041526 2002-06-04 15:20 26.7195 130.6895
200206041614 2002-06-04 16:07 26.5818 130.7769
200206041659 2002-06-04 16:53 26.4426 130.8606
200206041750 2002-06-04 17:42 26.3075 130.9475
200206041835 2002-06-04 18:29 26.1666 131.0315
200206090209 2002-06-09 02:06 29.3675 146.0158
200206091446 2002-06-09 14:43 32.3348 146.2613
200206091612 2002-06-09 16:09 32.6674 146.2971
200206091737 2002-06-09 17:34 33.0008 146.3356
200206091858 2002-06-09 18:56 33.3336 146.3753
200206092019 2002-06-09 20:16 33.6674 146.3976
200206092145 2002-06-09 21:43 34.0003 146.4338
200206100844 2002-06-10 08:42 34.3326 146.5813
200206101003 2002-06-10 10:01 34.6666 146.5408
200206101121 2002-06-10 11:19 35.0008 146.4875
200206101237 2002-06-10 12:35 35.3333 146.4471
200206130900 2002-06-13 08:58 37.5978 149.8333
200206130932 2002-06-13 09:29 37.5356 149.6658
200206131003 2002-06-13 10:00 37.4778 149.5004
200206131034 2002-06-13 10:31 37.4208 149.3333
200206131104 2002-06-13 11:02 37.3671 149.1666
200206131136 2002-06-13 11:34 37.3116 148.9998
200206131208 2002-06-13 12:06 37.2541 148.8331
200206131239 2002-06-13 12:37 37.1968 148.6670
200206131310 2002-06-13 13:08 37.1423 148.5000
200206131344 2002-06-13 13:42 37.0775 148.3336
200206131418 2002-06-13 14:16 37.0163 148.1668
200206131452 2002-06-13 14:50 36.9583 148.0003
200206131531 2002-06-13 15:29 36.8805 147.8330
200206131606 2002-06-13 16:04 36.8158 147.6663
200206131641 2002-06-13 16:38 36.7576 147.4996
200206131715 2002-06-13 17:13 36.6988 147.3330
200206131749 2002-06-13 17:47 36.6375 147.1665
200206131823 2002-06-13 18:21 36.5826 146.9998
200206131857 2002-06-13 18:55 36.5268 146.8330
200206131932 2002-06-13 19:28 36.4741 146.6671
200206132006 2002-06-13 20:03 36.4151 146.5045
200206140617 2002-06-14 06:15 35.9875 146.5105
200206140719 2002-06-14 07:17 35.7435 146.5096
200206140818 2002-06-14 08:16 35.5005 146.5013
200206140923 2002-06-14 09:21 35.2500 146.5011
200206141027 2002-06-14 10:25 34.9998 146.5033
200206141136 2002-06-14 11:34 34.7506 146.5015
200206141236 2002-06-14 12:34 34.5003 146.5045
200206141336 2002-06-14 13:34 34.2501 146.5038
200206141434 2002-06-14 14:32 34.0000 146.5050
200206141534 2002-06-14 15:32 33.7498 146.5051
200206141636 2002-06-14 16:33 33.5006 146.5040
200206141745 2002-06-14 17:43 33.2321 146.4996
200206141844 2002-06-14 18:41 33.0000 146.5026
200206141947 2002-06-14 19:45 32.7506 146.4955
200206142053 2002-06-14 20:51 32.5000 146.5091
200206142205 2002-06-14 22:03 32.2518 146.5006
200206181253 2002-06-18 12:45 37.0705 146.4983
200206181332 2002-06-18 13:30 37.2506 146.4991
200206181428 2002-06-18 14:26 37.5010 146.5003
: MR02-K03
: Processed (DMO)-QCed
: JAMSTEC

XBT DMO

Each data file contains one line header (meta data) followed by data lines for each cast.
The number of data lines are recorded in the header.
  1. Header part
No. Column Content Format Remarks
1 1 Header ID a1 fixed as '#'
2 3 - 6 Data ID a4 XBT
3 8 - 22 Cruise ID a15
4 33 - 40 Date i8 YYYYMMDD (UTC)
5 42 - 45 Time i4 hhmm (UTC)
6 47 - 55 Latitude i2,a1,f5.2,a1 dd-mm.mmN(S)
7 57 - 66 Longitude i3,a1,f5.2,a1 ddd-mm.mmE(W)
8 68 - 71 Number of data lines i4
9 72 - 73 Terminator - CR+LF
  1. Data part
No. Column Content Unit Format Remarks
1 1 - 11 Depth m f11.1
2 12 - 22 Temperature deg-C f11.2 ITS-90
3 45 - 55 Flag - i11 1 - 7 : space
8 : flag of depth
9 : flag of temperature
10 - 11 : space
* reference : 'Definition of Quality Control Flags'
4 56 - 57 Terminator - - CR+LF
Each contents of the data part is stored in 11 bytes.
Missing value is presented by '-5', and error value is presented by '-9'.

Definition of Quality Control Flags
  1. Depth Flags
  2. 0 - accepted value
    1 - error in recorded depth ( same or less than previous depth )
    2 - density inversion

  3. Observed Level Flags
  4. N - missing value
    0 - accepted value
    1 - range outlier ( outside of broad range check )
    2 - failed inversion check
    3 - failed gradient check
    4 - zero anomaly
    5 - failed combined gradient and inversion checks
    6 - failed range and inversion checks
    7 - failed range and gradient checks
    8 - failed range and zero anomaly checks
    9 - failed range and combined gradient and inversion checks
    A - failed visual check

    * Range and gradient check is performed to XBT data.

QCed data were added flag according to the NODC (National Oceanographic Data Center) quality control procedure, additionally visually checked. Please see the site of NODC of the following link for quality control procedure.

Related Information

Update History

2019-09-28
An observation data was registerd.
2017-06-29
An observation data was registerd.
2014-07-18
An observation data was registerd.
2014-02-20
An observation data was registerd.
2012-12-25
An observation data was registerd.