MIRAI MR04-05 Expendable Conductivity-Temperature-Depth Profiler (XCTD)

Last Modified: 2018-12-20
: MR04-05
: Processed (PI)
: JAMSTEC
: Depth, Temperature, Salinity
:
OCEANS > OCEAN TEMPERATURE > WATER TEMPERATURE
OCEANS > SALINITY/DENSITY > SALINITY

For Using Data

Koji Shimada (JAMSTEC)
See Terms and Conditions about constrain of use.
See Terms and Conditions about data citation.
Instrument:
Expendable conductivity temperature depth measurements (XCTD) ( - MR11-E02)
CitationShimada, K. 2004, R/V Mirai Cruise Report MR04-05, edited by K. Shimada, S. Nishino, and M. Itoh, 110pp., JAMSTEC, Yokosuka, Japan.

Upon consultation in advance with the chief of investigation and the person(s) in charge of research issues who gathered that data, we request that the text of the results material contain a statement to the effect that it was obtained during the R/V Mirai cruise of MR04-05 Leg1 under the project of JWACS 2004, the Chief Scientist, Koji Shimada (JAMSTEC), and the following Principal Investigators (PI) for gathering the data.

Chief Scientist
Koji Shimada (JAMSTEC)
Present contact address: Tokyo University of Marine Science and Technology
4-5-7, Konan, Minato-ku, Tokyo,108-8477, Japan
Tel: +81-3-5463-0465 Fax: +81-3-5463-0378
E-mail: koji AT kaiyodai.ac.jp

PI for XCTD
Koji Shimada (JAMSTEC)
Collaborators:
Motoyo Itoh (JAMSTEC)
Eddy Carmack (Institute of Ocean Sciences)
XCTD Salinity Calibration Note

The accuracy of the salinity data from the XCTD probes is about ±0.04 psu as stated in the manufacturer's report of Tsurumi-Seiki (XCTD maker). This is not good enough to detect the variability of Atlantic Water. In the Canada Basin, water properties are relatively uniform below the Atlantic layer. Therefore we correct the XCTD salinity data by using the neighboring CTD data.

Figure 1 Figure 1 show Temperature Salinity diagram of CTD and XCTD data of Mirai 2004 Arctic cruise. Blue dots show CTD data and green dots show XCTD data. The XCTD data scatters due to the salinity bias of the XCTD probe.

Figure 2 We calculate the salinity bias delS of each XCTD probe by comparing it with the neighboring CTD data on 0.3, 0.2 ,0.1 and 0.0 ℃.

  The salinity of XCTD was corrected using the following formula.
    Corrected XCTD S = XCTD S +delS

The last column of the XCTD log shows delS. Figure 3 is same as Figure 1, except that corrected salinities were used for the XCTD data. Figure 4 show distribution of salinity of both CTD and corrected XCTD where where temperature is 0.3, 0.2 ,0.1 and 0.0 ℃. The accuracy of the corrected XCTD salinities is about ±0.01 psu.

However, we can not correct the XCTD salinity data in shallow water regions using our method. The column that is named "flag" of the XCTD log shows either 0 if the salinity is corrected or 1 if the salinity is not corrected.

: MR04-05
: Processed (PI)
: JAMSTEC
: Depth, Temperature, Salinity
:
OCEANS > OCEAN TEMPERATURE > WATER TEMPERATURE
OCEANS > SALINITY/DENSITY > SALINITY

Observation Map

Imagery reproduced from ...

Data List

File names
001.ctd
002.ctd
003.ctd
004.ctd
005.ctd
006.ctd
007.ctd
008.ctd
009.ctd
010.ctd
011.ctd
012.ctd
013.ctd
014.ctd
015.ctd
016.ctd
017.ctd
018.ctd
019.ctd
020.ctd
021.ctd
022.ctd
023.ctd
024.ctd
025.ctd
026.ctd
027.ctd
028.ctd
029.ctd
030.ctd
031.ctd
032.ctd
033.ctd
034.ctd
035.ctd
036.ctd
037.ctd
038.ctd
039.ctd
040.ctd
041.ctd
042.ctd
043.ctd
044.ctd
045.ctd
046.ctd
047.ctd
048.ctd
049.ctd
050.ctd
051.ctd
052.ctd
053.ctd
054.ctd
055.ctd
056.ctd
057.ctd
058.ctd
059.ctd
060.ctd
061.ctd
062.ctd
063.ctd
064.ctd
065.ctd
066.ctd
067.ctd
068.ctd
069.ctd
070.ctd
071.ctd
072.ctd
073.ctd
074.ctd
075.ctd
076.ctd
077.ctd
078.ctd
079.ctd
080.ctd
081.ctd
082.ctd
083.ctd
084.ctd
085.ctd
086.ctd
087.ctd
088.ctd
089.ctd
090.ctd
091.ctd
092.ctd
093.ctd
094.ctd
095.ctd
096.ctd
097.ctd
098.ctd
099.ctd
100.ctd
101.ctd
102.ctd
103.ctd
104.ctd
105.ctd
106.ctd
107.ctd
108.ctd
109.ctd
110.ctd
111.ctd
112.ctd
113.ctd
114.ctd
: MR04-05
: Processed (PI)
: JAMSTEC

XCTD PI (MR04-05)

Each data file contains one line header (meta data) followed by data lines for each cast.
  1. Header part
No. Column Content Format Remarks
1 1 - 8 Date i2,a1,i2,a1,i2 YY/MM/DD (UTC)
2 10 - 17 Time i2,a1,i2,a1,i2 hh:mm:ss (UTC)
3 19 - 26 Longitude f8.3 DDD.ddd
DDD are degrees, and ddd are decimal degrees.
4 29 - 35 Latitude f7.3 SDD.ddd
"S" is sign (blank or missing is positive), DD are degrees, and ddd are decimal degrees. Sign is positive in northern hemisphere, negative in southern hemisphere.
  1. Data part
No. Column Content Unit Format Remarks
1 1 - 11 Depth m f11.6
2 13 - 23 Temperature deg-C f11.6 ITS-90
3 25 - 35 Conductivity mS/cm f11.6
4 37 - 47 Pressure dbar f11.6
5 49 - 59 Salinity PSU f11.6

Related Information

Update History

2018-12-20
An observation data was registerd.
2012-12-08
An observation data was registerd.
2012-11-25
An observation data was registerd.