MIRAI MR08-03 Expendable Conductivity-Temperature-Depth Profiler (XCTD)

Last Modified: 2019-08-29
: MR08-03
: Processed (DMO)-QCed
: JAMSTEC
: Depth, Temperature, Salinity
:
OCEANS > OCEAN TEMPERATURE > WATER TEMPERATURE
OCEANS > SALINITY/DENSITY > SALINITY

For Using Data

Data Management Office
See Terms and Conditions about constrain of use.
See Terms and Conditions about data citation.
Instrument:
Expendable conductivity temperature depth measurements (XCTD) ( - MR11-E02)
Using XCTD (eXpendable Conductivity Temperature Depth profiler) system, the vertical distribution of water temperature and salinity are observed during free fall of its probe part in the seawater. Observed temperature and conductivity are transmitted to the data processor on board by the digital signal. The digital signal is converted to the temperature, conductivity and depth by data processor as binary data. Binary data is transmitted from data processor to PC. The PC calculates salinity from temperature, conductivity and depth, and those properties are recorded in PC as the ASCII files.

(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 : 40 msec

(3) XCTD probe specifications
Probe Type TSK XCTD-1 TSK XCTD-2 TSK XCTD-3 TSK XCTD-4
Temperature range [deg-C] -2 to 35
Temperature accuracy [deg-C] +/- 0.02
Temperature resolution [deg-C] 0.01
Conductivity range [mS/cm] 0 to 60
Conductivity accuracy [mS/cm] +/- 0.03
Conductivity resolution [mS/cm] 0.015
Measurment depth [m] 1000 1850 1000 1850
Depth accuracy [m] 5 or +/- 2% of depth; whichever is larger
Maximum elapsed time [sec] 300 600 200 502
Rated ship speed [knot] 12 3.5 20 6

Since XCTD 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 XCTD-1 TSK XCTD-2 TSK XCTD-3 TSK XCTD-4
Coefficient-a 3.42543 3.43898 5.07598 3.68081
Coefficient-b -0.47 -0.31 -0.72 -0.47
* Coefficients listed above are supplied by Sippican, Inc., in USA.

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

Cast name Probe Serial No. Probe Type Launcher Converter
200807050144 07064653 XCTD-1 Auto MK-100
200807080213 07064656 XCTD-1 Auto MK-100
200807100238 07064655 XCTD-1 Auto MK-100
200807192348 07064654 XCTD-1 Auto MK-100
200807240147 07064657 XCTD-1 Auto MK-100
200807250956 08048282 XCTD-1 Auto MK-100
200807251238 08048281 XCTD-1 Auto MK-100
200807251838 08048283 XCTD-1 Auto MK-100
200807252101 08048285 XCTD-1 Auto MK-100
200807252301 08048284 XCTD-1 Auto MK-100
200807260629 08048286 XCTD-1 Auto MK-100
200808011813 06079373 XCTD-1 Auto MK-100
200808012000 06079371 XCTD-1 Auto MK-100
200808020009 06079372 XCTD-1 Auto MK-100
200808020255 06079370 XCTD-1 Auto MK-100
200808020608 06079374 XCTD-1 Auto MK-100
200808020745 06079382 XCTD-1 Auto MK-100
200808020920 06079383 XCTD-1 Auto MK-100
200808021043 06079379 XCTD-1 Auto MK-100
200808021212 06079384 XCTD-1 Auto MK-100
200808021331 06079375 XCTD-1 Auto MK-100
200808021448 06079380 XCTD-1 Auto MK-100
200808021601 06079376 XCTD-1 Auto MK-100
200808021711 06079381 XCTD-1 Auto MK-100
200808021856 06079388 XCTD-1 Auto MK-100
200808022010 06079385 XCTD-1 Auto MK-100
200808022125 07054047 XCTD-1 Auto MK-100
200808022245 06079386 XCTD-1 Auto MK-100
200808030129 06079389 XCTD-1 Auto MK-100
200808030442 06079387 XCTD-1 Auto MK-100
200808030746 06079390 XCTD-1 Auto MK-100
200808031025 07054046 XCTD-1 Auto MK-100
(1) For sensor's stablility, values of less than 1 m for temperature and less than 3 m for salinity 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 density inversion check
3) 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.
: MR08-03
: Processed (DMO)-QCed
: JAMSTEC
: Depth, Temperature, Salinity
:
OCEANS > OCEAN TEMPERATURE > WATER TEMPERATURE
OCEANS > SALINITY/DENSITY > SALINITY

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
200807050144.dat
200807080213.dat
200807100238.dat
200807192348.dat
200807240147.dat
200807250956.dat
200807251238.dat
200807251838.dat
200807252101.dat
200807252301.dat
200807260629.dat
200808011813.dat
200808012000.dat
200808020009.dat
200808020255.dat
200808020608.dat
200808020745.dat
200808020920.dat
200808021043.dat
200808021212.dat
200808021331.dat
200808021448.dat
200808021601.dat
200808021711.dat
200808021856.dat
200808022010.dat
200808022125.dat
200808022245.dat
200808030129.dat
200808030442.dat
200808030746.dat
200808031025.dat
ex_read2.f (Sample Program)
Observation List
The list of observation is shown as follows.
Observation Time and Date Lat. [°] Lon. [°]
200807050144 2008-07-05 01:39 5.0330 146.9475
200807080213 2008-07-08 02:08 1.9996 147.0295
200807100238 2008-07-10 02:33 -0.0173 146.9816
200807192348 2008-07-19 23:43 -0.0065 155.9566
200807240147 2008-07-24 01:42 4.9770 156.0166
200807250956 2008-07-25 09:51 5.5001 156.0000
200807251238 2008-07-25 12:33 6.0000 156.0000
200807251838 2008-07-25 18:33 6.5036 155.9986
200807252101 2008-07-25 20:56 7.0001 156.0000
200807252301 2008-07-25 22:56 7.5001 156.0000
200807260629 2008-07-26 06:24 8.0305 155.9556
200808011813 2008-08-01 18:08 32.0001 144.3003
200808012000 2008-08-01 19:55 32.2698 144.5108
200808020009 2008-08-02 00:04 33.0001 144.7000
200808020255 2008-08-02 02:50 33.5000 144.9003
200808020608 2008-08-02 06:03 33.9996 145.0998
200808020745 2008-08-02 07:40 34.2496 145.2000
200808020920 2008-08-02 09:14 34.4998 145.3000
200808021043 2008-08-02 10:38 34.7500 145.4000
200808021212 2008-08-02 12:07 35.0000 145.5000
200808021331 2008-08-02 13:26 35.2500 145.6000
200808021448 2008-08-02 14:43 35.5001 145.6998
200808021601 2008-08-02 15:56 35.7500 145.8001
200808021711 2008-08-02 17:06 36.0000 145.8996
200808021856 2008-08-02 18:51 36.2500 146.0001
200808022010 2008-08-02 20:05 36.5000 146.1000
200808022125 2008-08-02 21:20 36.7500 146.1998
200808022245 2008-08-02 22:40 37.0000 146.3000
200808030129 2008-08-03 01:24 37.5000 146.5000
200808030442 2008-08-03 04:37 38.0655 146.3841
200808030746 2008-08-03 07:41 38.5001 146.9000
200808031025 2008-08-03 10:20 39.0001 147.1001
: MR08-03
: Processed (DMO)-QCed
: JAMSTEC

XCTD DMO


Format Description for the Corrected Data
Provided in the Exchange Format of CCHDO (CLIVAR and Carbon Hydrographic Data Office). Please see the following link for details of Exchange Format.
Data in following cruise is not expressed with Exchange Format. Please see the site of each cruise for format.
MR02-K05 Leg1
MR04-05
Format Description for the QCed Data
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 XCTD
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 23 - 33 Salinity PSU f11.3 PSS-78
4 45 - 55 Flag - i11 1 - 7 : space
8 : flag of depth
9 : flag of temperature
10 : flag of salinity
11 : space
* reference : 'Definition of Quality Control Flags'
5 56 - 57 Terminator - - CR+LF
  1. Each contents of the data part is stored in 11 bytes.
  2. 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

    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

2019-08-29
An observation data was registerd.
2017-06-14
An observation data was registerd.
2014-07-31
An observation data was registerd.
2014-02-18
An observation data was registerd.
2012-10-27
An observation data was registerd.