KAIYO KY09-07 Expendable Conductivity-Temperature-Depth Profiler (XCTD)

Last Modified: 2019-09-07
: KY09-07
: 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.
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

(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
XCTD-000120090825 08069195 XCTD-1 Hand -
XCTD-000220090825 08069196 XCTD-1 Hand -
XCTD-000320090825 08069197 XCTD-1 Hand -
XCTD-000420090825 08069198 XCTD-1 Hand -
XCTD-000520090826 08069199 XCTD-1 Hand -
XCTD-000620090826 08069200 XCTD-1 Hand -
XCTD-000720090826 08069201 XCTD-1 Hand -
XCTD-000820090829 09064581 XCTD-1 Hand -
XCTD-000920090829 09064582 XCTD-1 Hand -
XCTD-001020090829 08069202 XCTD-1 Hand -
XCTD-001120090829 09064580 XCTD-1 Hand -
XCTD-001220090829 09064579 XCTD-1 Hand -
XCTD-001320090829 09064578 XCTD-1 Hand -
XCTD-001420090903 09064583 XCTD-1 Hand -
XCTD-001520090903 09064576 XCTD-1 Hand -
XCTD-001620090903 09064575 XCTD-1 Hand -
XCTD-001720090903 09064574 XCTD-1 Hand -
XCTD-001820090903 09064573 XCTD-1 Hand -
XCTD-001920090903 09064572 XCTD-1 Hand -
XCTD-002020090903 09064577 XCTD-1 Hand -
XCTD-002120090903 09064710 XCTD-1 Hand -
XCTD-002220090903 09064711 XCTD-1 Hand -
XCTD-002320090903 09064713 XCTD-1 Hand -
XCTD-002420090904 09064714 XCTD-1 Hand -
XCTD-002520090904 09064712 XCTD-1 Hand -
XCTD-002820090904 09064717 XCTD-1 Hand -
XCTD-002920090904 09064718 XCTD-1 Hand -
XCTD-003020090904 09064719 XCTD-1 Hand -
XCTD-003120090904 09064720 XCTD-1 Hand -
XCTD-003220090904 09064721 XCTD-1 Hand -
XCTD-003320090905 09064698 XCTD-1 Hand -
XCTD-003420090905 09064699 XCTD-1 Hand -
XCTD-003520090905 09064700 XCTD-1 Hand -
XCTD-003620090905 09064701 XCTD-1 Hand -
XCTD-003720090905 09064702 XCTD-1 Hand -
XCTD-003820090905 09064703 XCTD-1 Hand -
XCTD-003920090905 09064704 XCTD-1 Hand -
XCTD-004020090905 09064706 XCTD-1 Hand -
XCTD-004120090906 09064709 XCTD-1 Hand -
XCTD-004220090906 09064708 XCTD-1 Hand -
XCTD-004320090906 09064705 XCTD-1 Hand -
XCTD-004420090906 09074916 XCTD-1 Hand -
XCTD-004520090906 09074919 XCTD-1 Hand -
XCTD-004620090906 09064707 XCTD-1 Hand -
XCTD-004720090906 09074917 XCTD-1 Hand -
(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.
: KY09-07
: 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
XCTD-000120090825.dat
XCTD-000220090825.dat
XCTD-000320090825.dat
XCTD-000420090825.dat
XCTD-000520090826.dat
XCTD-000620090826.dat
XCTD-000720090826.dat
XCTD-000820090829.dat
XCTD-000920090829.dat
XCTD-001020090829.dat
XCTD-001120090829.dat
XCTD-001220090829.dat
XCTD-001320090829.dat
XCTD-001420090903.dat
XCTD-001520090903.dat
XCTD-001620090903.dat
XCTD-001720090903.dat
XCTD-001820090903.dat
XCTD-001920090903.dat
XCTD-002020090903.dat
XCTD-002120090903.dat
XCTD-002220090903.dat
XCTD-002320090903.dat
XCTD-002420090904.dat
XCTD-002520090904.dat
XCTD-002820090904.dat
XCTD-002920090904.dat
XCTD-003020090904.dat
XCTD-003120090904.dat
XCTD-003220090904.dat
XCTD-003320090905.dat
XCTD-003420090905.dat
XCTD-003520090905.dat
XCTD-003620090905.dat
XCTD-003720090905.dat
XCTD-003820090905.dat
XCTD-003920090905.dat
XCTD-004020090905.dat
XCTD-004120090906.dat
XCTD-004220090906.dat
XCTD-004320090906.dat
XCTD-004420090906.dat
XCTD-004520090906.dat
XCTD-004620090906.dat
XCTD-004720090906.dat
ex_read2.f (Sample Program)
Observation List
The list of observation is shown as follows.
Observation Time and Date Lat. [°] Lon. [°]
XCTD-000120090825 2009-08-25 16:48 38.0001 141.2000
XCTD-000220090825 2009-08-25 19:04 37.9998 141.7000
XCTD-000320090825 2009-08-25 21:14 38.0000 142.1996
XCTD-000420090825 2009-08-25 23:15 38.0000 142.7003
XCTD-000520090826 2009-08-26 02:31 37.9985 143.2031
XCTD-000620090826 2009-08-26 04:29 38.0000 143.7000
XCTD-000720090826 2009-08-26 06:38 38.0000 144.2000
XCTD-000820090829 2009-08-29 03:32 38.0896 146.4621
XCTD-000920090829 2009-08-29 05:18 38.0000 146.2000
XCTD-001020090829 2009-08-29 07:29 38.0000 145.6996
XCTD-001120090829 2009-08-29 09:39 38.0000 145.1998
XCTD-001220090829 2009-08-29 11:48 38.0000 144.7000
XCTD-001320090829 2009-08-29 13:55 38.0000 144.2001
XCTD-001420090903 2009-09-03 06:00 37.9960 146.6973
XCTD-001520090903 2009-09-03 08:38 37.4998 146.5001
XCTD-001620090903 2009-09-03 11:35 37.0000 146.3001
XCTD-001720090903 2009-09-03 13:27 36.7501 146.1998
XCTD-001820090903 2009-09-03 15:16 36.5005 146.0986
XCTD-001920090903 2009-09-03 17:02 36.2506 145.9996
XCTD-002020090903 2009-09-03 18:48 36.0001 145.9000
XCTD-002120090903 2009-09-03 20:30 35.7498 145.8000
XCTD-002220090903 2009-09-03 22:15 35.5000 145.7000
XCTD-002320090903 2009-09-03 23:53 35.2498 145.5998
XCTD-002420090904 2009-09-04 01:24 34.9998 145.4998
XCTD-002520090904 2009-09-04 02:51 34.7498 145.4000
XCTD-002820090904 2009-09-04 05:48 34.2496 145.1998
XCTD-002920090904 2009-09-04 07:15 33.9998 145.0998
XCTD-003020090904 2009-09-04 09:59 33.4998 144.9000
XCTD-003120090904 2009-09-04 12:43 32.9998 144.6998
XCTD-003220090904 2009-09-04 16:27 32.3166 144.5416
XCTD-003320090905 2009-09-05 09:21 32.5379 144.6603
XCTD-003420090905 2009-09-05 12:28 32.7503 143.9491
XCTD-003520090905 2009-09-05 15:04 33.0498 143.4503
XCTD-003620090905 2009-09-05 17:48 33.3500 142.9501
XCTD-003720090905 2009-09-05 19:12 33.5000 142.7001
XCTD-003820090905 2009-09-05 20:35 33.6500 142.4500
XCTD-003920090905 2009-09-05 21:59 33.8001 142.2000
XCTD-004020090905 2009-09-05 23:23 33.9501 141.9498
XCTD-004120090906 2009-09-06 00:45 34.1003 141.7000
XCTD-004220090906 2009-09-06 02:07 34.2503 141.4500
XCTD-004320090906 2009-09-06 03:30 34.4000 141.2000
XCTD-004420090906 2009-09-06 04:52 34.5500 140.9500
XCTD-004520090906 2009-09-06 06:10 34.7000 140.7000
XCTD-004620090906 2009-09-06 07:31 34.8500 140.4498
XCTD-004720090906 2009-09-06 09:00 35.0000 140.2000
: KY09-07
: 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

2019-09-07
An observation data was registerd.
2017-06-14
An observation data was registerd.
2014-10-02
An observation data was registerd.
2014-02-20
An observation data was registerd.
2012-09-28
An observation data was registerd.