File Format of BT data

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BT data files consist of header part (first 11 records) and data part, The following elements are separated by comma in each record.

(a) Header part
Record Information
Record No. Element

Rec-1 Ship name (listed in Table), cruise number and format code. Cruise number is identified with the year and the month. Format code is 'V2.1'.

Rec-2 Station number.Station number is given by the ship code (at the BT observation only. listed in Table) suffixed with four-digits consecutive numbers.

Rec-3 The number of data records.

Rec-4 Date(year/month/day) and time at the beginning of the bathythermograph(BT) observation in the Japan Standard Time (JST), which is nine hours ahead of the Coordinated Universal Time (UTC).

Rec-5 Latitude and longitude at the beginning of the bathythermograph (BT) observation with degrees, `-', minutes, `.', hundredth part of minutes.

Rec-6 Water depth at the beginning of the bathythermograph (BT) observation and sounding flag (listed in Table).

Rec-7 Corresponding station number of the subsurface current data and sub-station number.

Rec-8 Sea surface temperature and salinity.

Rec-9 Type of 'bathythermograph (BT) '; (X-BT: eXpendable BT, D-BT: Digital BT.).

Rec-10 for X-BT Probe type and probe serial number.

Rec-11 for X-BT Coefficients of the depth-time equation (listed in Table).

Rec-10, Rec-11 for D-BT Headers for data columns.

Rec-12, Rec-13 for X-BT Headers for data columns.

**Record Information**
Record No.	Element
Rec-1	Ship name (listed in Table), cruise number and format code. Cruise number is identified with the year and the month. Format code is 'V2.1'.
Rec-2	Station number.Station number is given by the ship code (at the BT observation only. listed in Table) suffixed with four-digits consecutive numbers.
Rec-3	The number of data records.
Rec-4	Date(year/month/day) and time at the beginning of the bathythermograph(BT) observation in the Japan Standard Time (JST), which is nine hours ahead of the Coordinated Universal Time (UTC).
Rec-5	Latitude and longitude at the beginning of the bathythermograph (BT) observation with degrees, `-', minutes, `.', hundredth part of minutes.
Rec-6	Water depth at the beginning of the bathythermograph (BT) observation and sounding flag (listed in Table).
Rec-7	Corresponding station number of the subsurface current data and sub-station number.
Rec-8	Sea surface temperature and salinity.
Rec-9	Type of 'bathythermograph (BT) '; (X-BT: eXpendable BT, D-BT: Digital BT.).
Rec-10 for X-BT	Probe type and probe serial number.
Rec-11 for X-BT	Coefficients of the depth-time equation (listed in Table).
Rec-10, Rec-11 for D-BT	Headers for data columns.
Rec-12, Rec-13 for X-BT	Headers for data columns.

(b) Data part

Data are described at every 1 meter. The meaning of attached flags is shown in table.

Record information
Record No. Elements

below Rec-15 Depth, Temperature and flag of temperature (listed in table).

**Record information**
Record No.	Elements
below Rec-15	Depth, Temperature and flag of temperature (listed in table).

Ship code.
Ship Code Ship Name BT Code CALL SIGN AERO CODE

KO Kofu Maru to JDWX 1 2 47 002

RF Ryofu Maru tf JGQH 1 2 47 646

KS Keifu Maru ts JPBN 1 2 47 000

SH Shumpu Maru th JFDG NIL

NC Chofu Maru tc JCCX 1 2 47 001

SM Seifu Maru tm JIVB 1 2 47 003

**Ship code**.
Ship Code	Ship Name	BT Code	CALL SIGN	AERO CODE
KO	Kofu Maru	to	JDWX	1 2 47 002
RF	Ryofu Maru	tf	JGQH	1 2 47 646
KS	Keifu Maru	ts	JPBN	1 2 47 000
SH	Shumpu Maru	th	JFDG	NIL
NC	Chofu Maru	tc	JCCX	1 2 47 001
SM	Seifu Maru	tm	JIVB	1 2 47 003

Probe code.
coefficients coefficients

Code Manufacturer Probe Type am bm

212 Turumi Seiki Co. T-6 6.691 -0.00225

222 Turumi Seiki Co. T-7 6.691 -0.00225

231 Turumi Seiki Co. T-5 6.828 -0.00182

252 Turumi Seiki Co. Deep Blue 6.691 -0.00225

**Probe code**.
			coefficients	coefficients
Code	Manufacturer	Probe Type	am	bm
212	Turumi Seiki Co.	T-6	6.691	-0.00225
222	Turumi Seiki Co.	T-7	6.691	-0.00225
231	Turumi Seiki Co.	T-5	6.828	-0.00182
252	Turumi Seiki Co.	Deep Blue	6.691	-0.00225

Probe code and coefficients of the depth-time equation in Subsurface Temperature data. The depth-time equation is of the form;

zm = am * t + bm * t ^2

where zm is the depth and t is the elapsed time in seconds starting when the probe hits the surface; am and bm are positive constants.

Sounding flag of water depth in CTD, XCTD and BT data.
Flag No. Definition

1 Sounding by echo-sounder (not corrected)

2 Sounding by echo-sounder (corrected)

5 Water depth measured by CTD and altimeter

6 Water depth measured by BT or XCTD submersible

9 No sounding

**Sounding flag of water depth in CTD, XCTD and BT data**.
Flag No.	Definition
1	Sounding by echo-sounder (not corrected)
2	Sounding by echo-sounder (corrected)
5	Water depth measured by CTD and altimeter
6	Water depth measured by BT or XCTD submersible
9	No sounding

Data flag in CTD, XCTD and BT data.
Flag No. Definition

2 Good

3 Doubtful

4 Bad

6 Interpolation by the separated layer over 2X10^4 Pa

7 Spike corrected

9 No data

**Data flag in CTD, XCTD and BT data**.
Flag No.	Definition
2	Good
3	Doubtful
4	Bad
6	Interpolation by the separated layer over 2X10^4 Pa
7	Spike corrected
9	No data

Instrument codes for observation using expendable probe.
Code Instrument

32 Murayama Denki Z-60-16-III

33 Murayama Denki Z-60-16-II

45 Tsurumi Seiki Co. MK-100

46 Tsurumi Seiki Co. MK-130 Compatible recorder

Code	Instrument
32	Murayama Denki Z-60-16-III
33	Murayama Denki Z-60-16-II
45	Tsurumi Seiki Co. MK-100
46	Tsurumi Seiki Co. MK-130 Compatible recorder