MIRAI MR02-K06 Leg2 Expendable Conductivity-Temperature-Depth Profiler (XCTD)

Last Modified: 2019-08-29
: MR02-K06 Leg2
: 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
200212171159 02090733 XCTD-1 Auto MK-100
200212171603 02090735 XCTD-1 Auto MK-100
200212172016 02090736 XCTD-1 Auto MK-100
200212180102 02090734 XCTD-1 Auto MK-100
200212180522 02090730 XCTD-1 Auto MK-100
200212180940 02090732 XCTD-1 Auto MK-100
200212181353 02090731 XCTD-1 Auto MK-100
200212200219 02090725 XCTD-1 Auto MK-100
200212200627 02090728 XCTD-1 Auto MK-100
200212201039 02090726 XCTD-1 Auto MK-100
200212220204 02090727 XCTD-1 Auto MK-100
200212220758 02090737 XCTD-1 Auto MK-100
200212230841 02090739 XCTD-1 Auto MK-100
200212231253 02090738 XCTD-1 Auto MK-100
200212250201 02090741 XCTD-1 Auto MK-100
200212250555 02090743 XCTD-1 Auto MK-100
200212250943 02090744 XCTD-1 Auto MK-100
200212251335 02090740 XCTD-1 Auto MK-100
200212251720 02090745 XCTD-1 Auto MK-100
200212290730 02090746 XCTD-1 Auto MK-100
200212291127 02090748 XCTD-1 Auto MK-100
200212291522 02090747 XCTD-1 Auto MK-100
200212310120 02090749 XCTD-1 Auto MK-100
200212310536 02090715 XCTD-1 Auto MK-100
200301030548 02090718 XCTD-1 Auto MK-100
200301030939 02090721 XCTD-1 Auto MK-100
200301040237 02090724 XCTD-1 Auto MK-100
200301050839 02090713 XCTD-1 Auto MK-100
200301051223 02090714 XCTD-1 Auto MK-100
200301060255 02090717 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.
: MR02-K06 Leg2
: 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
200212171159.dat
200212171603.dat
200212172016.dat
200212180102.dat
200212180522.dat
200212180940.dat
200212181353.dat
200212200219.dat
200212200627.dat
200212201039.dat
200212220204.dat
200212220758.dat
200212230841.dat
200212231253.dat
200212250201.dat
200212250555.dat
200212250943.dat
200212251335.dat
200212251720.dat
200212290730.dat
200212291127.dat
200212291522.dat
200212310120.dat
200212310536.dat
200301030548.dat
200301030939.dat
200301040237.dat
200301050839.dat
200301051223.dat
200301060255.dat
ex_read2.f (Sample Program)
Observation List
The list of observation is shown as follows.
Observation Time and Date Lat. [°] Lon. [°]
200212171159 2002-12-17 11:54 12.0000 145.1443
200212171603 2002-12-17 15:58 11.0001 145.4663
200212172016 2002-12-17 20:11 10.0011 145.7963
200212180102 2002-12-18 00:57 9.0001 146.1385
200212180522 2002-12-18 05:17 7.9998 146.4668
200212180940 2002-12-18 09:35 7.0011 146.7030
200212181353 2002-12-18 13:48 5.9928 146.8506
200212200219 2002-12-20 02:15 4.9675 147.0321
200212200627 2002-12-20 06:22 4.0001 146.9993
200212201039 2002-12-20 10:34 3.0003 147.0020
200212220204 2002-12-22 01:59 2.0745 146.9453
200212220758 2002-12-22 07:53 0.9996 145.9680
200212230841 2002-12-23 08:36 0.0261 144.9701
200212231253 2002-12-23 12:48 0.0353 146.0006
200212250201 2002-12-25 01:56 0.0535 147.0106
200212250555 2002-12-25 05:50 0.0016 148.0001
200212250943 2002-12-25 09:38 -0.0003 148.9990
200212251335 2002-12-25 13:30 0.0000 150.0003
200212251720 2002-12-25 17:15 0.0001 150.9998
200212290730 2002-12-29 07:25 -5.0311 156.0430
200212291127 2002-12-29 11:22 -3.9998 155.9995
200212291522 2002-12-29 15:17 -3.0006 155.9683
200212310120 2002-12-31 01:15 -2.0190 155.9635
200212310536 2002-12-31 05:31 -1.0000 156.0191
200301030548 2003-01-03 05:43 0.0073 156.0351
200301030939 2003-01-03 09:34 1.0005 155.9990
200301040237 2003-01-04 02:32 2.0378 156.0193
200301050839 2003-01-05 08:34 3.0008 156.0021
200301051223 2003-01-05 12:18 4.0003 155.9876
200301060255 2003-01-06 02:50 5.0250 155.9683
: MR02-K06 Leg2
: 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.
2014-07-18
An observation data was registerd.
2014-02-18
An observation data was registerd.
2012-12-25
An observation data was registerd.