Format of Hydrographic data

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Hydrographic data consist of 4 types of records: HEADER-1, HEADER-2, HEADER-3 and DATA. HEADER-1 represents cruise information. HEADER-2 and HEADER-3 represent station information and remarks, respectively. DATA includes observation data at the station.

The data files are composed of HEADER-1 and station data groups. HEADER-1 is always located at the beginning of the file. The station data groups are composed of HEADER-2, HEADER-3 and DATA. The character '@' on the "REC_IND" of DATA represents the end record of the station data group.

The parenthetic 'OBS' on the "DEPTH", "TEMP" and "SAL" of DATA means that the data was measured by CTD while the sea water sampled. Similarly, the parenthetic 'STD' means that the data was measured at the standard depths during the downcast of CTD.

HEADER-1 (Cruise Information)
Element Start Position Field Type Description of Field

FORMAT CODE 1 A4 Format Code of the file: 'E2.1'

CRUISE NO 6 I4 Cruise number identified with the year and the month.

PERIOD 11 2(2I2,1X) Date of beginning and end of the CTD and XCTD observations.

AREA 21 A98 Observation area.

NO OF STN 119 I4 Number of stations.

SHIP CODE 124 A2 Ship Code (listed in Table)

REC_IND 126 A1 '@'

**HEADER-1 (Cruise Information)**
Element	Start Position	Field Type	Description of Field
FORMAT CODE	1	A4	Format Code of the file: 'E2.1'
CRUISE NO	6	I4	Cruise number identified with the year and the month.
PERIOD	11	2(2I2,1X)	Date of beginning and end of the CTD and XCTD observations.
AREA	21	A98	Observation area.
NO OF STN	119	I4	Number of stations.
SHIP CODE	124	A2	Ship Code (listed in Table)
REC_IND	126	A1	'@'

HEADER-2 (Station Information)
Element Start Position Field Type Description of Field

STATION NO 1 A3,I4 Station number given by the ship code suffixed with four digits consecutive numbers.

LATITUDE 9 I2,1X,I2,I1,A1 Degrees, minutes and tenths of minutes (if given) of latitude, N or S.

LONGITUDE 17 I3,1X,I2,I1,A1 Degrees, minutes and tenths of minutes (if given) of longitude, E or W.

DATE/TIME 26 2(I2,1X,I2,1X,2I2,1X) Month, day and time of beginning and end of a hydrographic cast in the Japan Standard Time (JST), which is nine hours ahead of the coordinated Universal Time (UTC).

W-DEPTH 48 I4 Water depth to the bottom in meters.

W-COLOR 54 I2 Color of sea in Forel-Ure scale.

TRANS 57 I2,1X,I2,1X Transparency in meters with wire angle in parentheses, as determined by Secchi Disk.

SSF-NO 102 A3,I3 Corresponding station number of the subsurface temperature data.

ACM-NO 109 A3,I3 Corresponding station number of the subsurface current data.

SUB STN NO 116 A6 Sub station number.

CRUISE NO 122 I4

REC_IND 126 A1 '='

**HEADER-2** **(Station Information)**
Element	Start Position	Field Type	Description of Field
STATION NO	1	A3,I4	Station number given by the ship code suffixed with four digits consecutive numbers.
LATITUDE	9	I2,1X,I2,I1,A1	Degrees, minutes and tenths of minutes (if given) of latitude, N or S.
LONGITUDE	17	I3,1X,I2,I1,A1	Degrees, minutes and tenths of minutes (if given) of longitude, E or W.
DATE/TIME	26	2(I2,1X,I2,1X,2I2,1X)	Month, day and time of beginning and end of a hydrographic cast in the Japan Standard Time (JST), which is nine hours ahead of the coordinated Universal Time (UTC).
W-DEPTH	48	I4	Water depth to the bottom in meters.
W-COLOR	54	I2	Color of sea in Forel-Ure scale.
TRANS	57	I2,1X,I2,1X	Transparency in meters with wire angle in parentheses, as determined by Secchi Disk.
SSF-NO	102	A3,I3	Corresponding station number of the subsurface temperature data.
ACM-NO	109	A3,I3	Corresponding station number of the subsurface current data.
SUB STN NO	116	A6	Sub station number.
CRUISE NO	122	I4
REC_IND	126	A1	'='

HEADER-3 (Station Remarks)
Element Start Position Field Type Description of Field

STATION NO 1 A3,I4

REMARKS 9 A82 Remarks of the station.

PARAM INF 91 A35 Information of additional parameters in "DATA"

REC_IND 126 A1 '='

**HEADER-3** **(Station Remarks)**
Element	Start Position	Field Type	Description of Field
STATION NO	1	A3,I4
REMARKS	9	A82	Remarks of the station.
PARAM INF	91	A35	Information of additional parameters in "DATA"
REC_IND	126	A1	'='

DATA (Observation Data)
Element Start Position Field Type Description of Field

STATION NO 1 A3,I4

TIME 9 2I2 Sampling time in JST.

DEPTH(OBS) 17 I4 Depth of sampling in meters.

TEMP(OBS) 22 F5.2 CTD temperature in "the International Temperature Scale of 1990 (ITS-90)"

SAL(OBS) 28 F6.3 CTD salinity in "the practical salinity scale, 1978 (PSS-78)"

DO 35 I3 Concentration of dissolved oxygen in micro mol per liter as determined by the Winkler Method.

PO4-P 39 F4.2 Inorganic phosphate-phosphorus in micro mol per liter as determined by the reduction method using ascorbic acid (Strickland and Parsons, 1965).

T-P 44 F4.2 Total phosphorus in micro mol per liter as determined using the potassium persulfate decomposition method.

NO3-N 49 F4.1 (Nitrate + nitrite)-nitrogen in micro mol per liter as determined by the Muellin-Riley method using copper-cadmium reduction column (Wood, Armstrong and Richard,1967).

NO2-N 54 F4.2 Nitrite-nitrogen in micro mol per liter as determined by the Bendschneider and Robinson method (Strickland and Parsons, 1965).

NH3-N 59 F4.2 Ammonia-nitrogen in micro mol per liter as determined by the modified indophenol method.

PH 64 F4.2 Hydrogen-ion concentration at 25 degrees centigrade as determined by the pH meter.

CHL 69 F6.2 Chlorophyll a in micrograms per liter as determined by the fluorometric technique.

PHA 76 F6.2 Phaeopigments in micrograms per liter as determined by the fluorometric technique.

(ADD PARAM) 83 (Additional parameter.)

DEPTH(STD) 94 I4 Standard depths in meters.

TEMP(STD) 99 F5.2 CTD temperature in ITS-90

SAL(STD) 105 F6.3 CTD salinity in PSS-78"

D-ST 116 I4 Thermosteric anomaly in 10^8 m^3/kg.

DELTA-D 121 F5.3 Geopotential anomaly in 10 m^2/sec^2.

REC_IND 126 A1 '@'(End Record of station) or '='

Element	Start Position	Field Type	Description of Field
STATION NO	1	A3,I4
TIME	9	2I2	Sampling time in JST.
DEPTH(OBS)	17	I4	Depth of sampling in meters.
TEMP(OBS)	22	F5.2	CTD temperature in "the International Temperature Scale of 1990 (ITS-90)"
SAL(OBS)	28	F6.3	CTD salinity in "the practical salinity scale, 1978 (PSS-78)"
DO	35	I3	Concentration of dissolved oxygen in micro mol per liter as determined by the Winkler Method.
PO4-P	39	F4.2	Inorganic phosphate-phosphorus in micro mol per liter as determined by the reduction method using ascorbic acid (Strickland and Parsons, 1965).
T-P	44	F4.2	Total phosphorus in micro mol per liter as determined using the potassium persulfate decomposition method.
NO3-N	49	F4.1	(Nitrate + nitrite)-nitrogen in micro mol per liter as determined by the Muellin-Riley method using copper-cadmium reduction column (Wood, Armstrong and Richard,1967).
NO2-N	54	F4.2	Nitrite-nitrogen in micro mol per liter as determined by the Bendschneider and Robinson method (Strickland and Parsons, 1965).
NH3-N	59	F4.2	Ammonia-nitrogen in micro mol per liter as determined by the modified indophenol method.
PH	64	F4.2	Hydrogen-ion concentration at 25 degrees centigrade as determined by the pH meter.
CHL	69	F6.2	Chlorophyll a in micrograms per liter as determined by the fluorometric technique.
PHA	76	F6.2	Phaeopigments in micrograms per liter as determined by the fluorometric technique.
(ADD PARAM)	83		(Additional parameter.)
DEPTH(STD)	94	I4	Standard depths in meters.
TEMP(STD)	99	F5.2	CTD temperature in ITS-90
SAL(STD)	105	F6.3	CTD salinity in PSS-78"
D-ST	116	I4	Thermosteric anomaly in 10^8 m^3/kg.
DELTA-D	121	F5.3	Geopotential anomaly in 10 m^2/sec^2.
REC_IND	126	A1	'@'(End Record of station) or '='