OceanAtlas: About NODC SD2

About NODC SD2

NODC SD2 Standard Data Exchange Format

NODC SD2 format is a standard data exchange format created in the days of 80-column punch cards. It has many deficiencies, for example in terms of handling the full data value resolution provided by today's oceanographic equipment, in accepting modern preferences for units, and especially in accepting data for the many oceanographic tracers such as CFCs, helium, tritium, and radiocarbon that have proved to be of interest and value. But it is such a rigidly and well described format that all data which adhere to the format specification can be read by a computer application which can read any of the data. Hence many oceanographers have access to computer applications which can use or import SD2 format data. NODC is now in the process of replacing its recommended standard exchange format for oceanographic profile data. If this transition is completed by the time Version 2.0 of the Atlas of Ocean Sections is completed, we will provide the section data in that format as well. Below is a description of the NODC Station Data (SD) format. Please see the NODC web site at http://www.nodc.noaa.gov/ for further information.

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NODC SD2 - Header Records

. NODC SD2 - Master Record 1
. NODC SD2 - Master Record 2
. NODC SD2 - Data Record

Master Record 1

MASTER RECORD 1: ****** *********** ****** ****** START ATTRIBUTES ITEM COLUMN ------ ---- ------ 1 I1 CONTINUATION INDICATOR 2 1X BLANK 3 I2 NODC REFERENCE NUMBER - COUNTRY 5 I1 NODC REFERENCE NUMBER - FILE CODE always "5" 6 I4 NODC REFERENCE NUMBER - CRUISE NUMBER 10 I4 NODC CONSECUTIVE STATION NUMBER 14 I2 DATA TYPE 16 2X BLANK 18 I4 TEN-DEGREE SQUARE, WMO 22 I2 ONE-DEGREE SQUARE, WMO 24 I2 TWO-DEGREE SQUARE, WMO 26 I1 FIVE-DEGREE SQUARE, WMO 27 A1 N OR S HEMISPHERE OF LATITUDE 28 I2 DEGREES LATITUDE 30 I2 MINUTES LATITUDE 32 I1 MINUTES LATITUDE, TENTHS 33 A1 W OR E HEMISPHERE OF LONGITUDE 34 I3 DEGREES LONGITUDE 37 I2 MINUTES LONGITUDE 39 I1 MINUTES LONGITUDE, TENTHS 40 I1 QUARTER OF ONE-DEGREE SQUARE, WMO 41 I2 YEAR, GMT 43 I2 MONTH OF YEAR, GMT 45 I2 DAY OF MONTH, GMT 47 F3.1 STATION TIME, GMT HOURS TO TENTHS 50 I2 DATA ORIGIN - COUNTRY 52 I2 DATA ORIGIN - INSTITUTION 54 A2 DATA ORIGIN - PLATFORM 56 I5 BOTTOM DEPTH (WHOLE METERS) ** 61 I4 EFFECTIVE DEPTH (WHOLE METERS) ** 65 F3.1 CAST DURATION (HOURS TO TENTHS) ** 68 A1 CAST DIRECTION (U=UP,D=DOWN,A=AVG OF UP & DOWN CASTS) 69 1X BLANK ** 70 I1 DATA USE CODE 71 I4 MINIMUM DEPTH 75 I4 MAXIMUM DEPTH 79 I1 ALWAYS 2 NEXT RECORD INDICATOR 80 I1 ALWAYS 1 RECORD INDICATOR ** FIELD DEFINED BY NODC, CALCULATION NOT DONE BY THIS FACILITY.

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Master Record 2

MASTER RECORD 2: ****** *********** ****** ****** START ATTRIBUTES ITEM COLUMN ------ ---- ------ 1 I4 DEPTH DIFFERENCE (BOTTOM DEPTH - MAXIMUM DEPTH) ** 5 2X SAMPLE INTERVAL ** 7 A1 % SALINITY OBSERVED(0=1-9%, 9=90-99%, - = 0) ** 8 A1 % OXYGEN OBSERVED(0=1-9%, 9=90-99%, - = 0) ** 9 A1 % PHOSPHATE OBSERVED(0=1-9%, 9=90-99%, - = 0) ** 10 A1 % TOTAL PHOSPHOROUS OBSERVED(0=1-9%, 9=90-99%, - = 0) ** 11 A1 % SILICATE OBSERVED(0=1-9%, 9=90-99%, - = 0) ** 12 A1 % NITRITE OBSERVED(0=1-9%, 9=90-99%, - = 0) ** 13 A1 % NITRATE OBSERVED(0=1-9%, 9=90-99%, - = 0) ** 14 A1 % PH OBSERVED(0=1-9%, 9=90-99%, - = 0) 15 A3 ORIGINATOR'S CRUISE IDENTIFIER 18 A9 ORIGINATOR'S STATION IDENTIFIER 27 I2 WATER COLOR FOREL-ULE SCALE (00-21) 29 I2 WATER TRANSPARENCY SECCHI DEPTH (WHOLE METERS) 31 I2 WAVE DIRECTION - WMO CODE 0885 33 A1 WAVE HEIGHT - WMO CODE 1555 ** 34 I1 SEA STATE ** 35 A2 WIND FORCE ** 37 I1 FILE UPDATE CODE 38 A1 WAVE PERIOD - WMO CODE 3155 39 I2 WIND DIRECTION - WMO CODE 0877 41 I2 WIND SPEED (KNOTS) 43 F5.1 BAROMETRIC PRESSURE, MILLIBARS 48 F4.1 DRY BULB TEMPERATURE,CELSIUS 52 I1 DRY BULB TEMP,PRECISION (0=WHOLE DEG,1=TENTHS,9=BLANK) 53 F4.1 WET BULB TEMPERATURE,CELSIUS 57 I1 WET BULB TEMP,PRECISION (0=WHOLE DEG,1=TENTHS,9=BLANK) 58 A2 WEATHER (X IN COL. 58 INDICATES WMO CODE 4501) 60 I1 CLOUD TYPE - WMO CODE 0500 61 I1 CLOUD AMOUNT - WMO CODE 2700 62 I3 NUMBER OF OBSERVED DEPTHS ** 65 I2 NUMBER OF STANDARD DEPTH LEVELS 67 I3 NUMBER OF DETAIL DEPTHS 70 9X BLANK 79 I1 NEXT RECORD INDICATOR 80 I1 ALWAYS 2 RECORD INDICATOR ** FIELD DEFINED BY NODC, NO DATA SAMPLED OR CALCULATION NOT DONE BY THIS FACILITY.

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Data Record

DATA RECORD: ****** *********** ****** ****** START ATTRIBUTES ITEM COLUMN ------ ---- ------ 1 I5 DEPTH, WHOLE METERS 6 I1 DEPTH QUALITY INDICATOR 7 A1 THERMOMETRIC DEPTH FLAG 8 F5.3 TEMPERATURE, CELSIUS 13 I1 TEMPERATURE, PRECISION (1,2, OR 3, 9=BLANK) 14 I1 TEMPERATURE QUALITY INDICATOR 15 F5.3 SALINITY, PRACTICAL SALINITY UNITS 20 I1 SALINITY PRECISION (1,2, OR 3, 9=BLANK) 21 I1 SALINITY QUALITY INDICATOR ** 22 I4 SIGMA-T ** 26 I1 SIGMA-T QUALITY INDICATOR ** 27 I5 SOUND SPEED (METERS/SECOND TO TENTHS) ** 32 I1 SOUND SPEED PRECISION 33 F4.2 OXYGEN, MILLILITERS/LITER 37 I1 OXYGEN PRECISION (1 OR 2, 9=BLANK) 38 I1 OXYGEN QUALITY INDICATOR ** 39 I1 DATA RANGE CHECK FLAGS PHOSPHATE > 4.00 ** 40 I1 0=IN RANGE, TOTAL PHOSPHATE < PHOSPHATE ** 41 I1 1=OUT OF RANGE SILICATE > 300.0 ** 42 I1 NITRITE > 4.0 ** 43 I1 NITRATE > 45.0 ** 44 I1 PH < 7.40 OR > 8.50 45 F3.1 CAST START TIME OR MESSENGER RELEASE TIME 48 I1 CAST NUMBER 49 F4.2 INORGANIC PHOSPHATE (MICROGRAM-ATOMS/LITER) 53 I1 INORGANIC PHOSPHATE, PRECISION (1,2 OR 9=BLANK) ** 54 F4.2 TOTAL PHOSPHOROUS ** 58 I1 TOTAL PHOSPHOROUS, PRECISION (1, 2 OR 9=BLANK) 59 F4.1 SILICATE (MICROGRAM-ATOMS/LITER) 63 I1 SILICATE PRECISION (1 OR 9=BLANK) 64 F3.2 NITRITE (MICROGRAM-ATOMS/LITER) 67 I1 NITRITE PRECISION (1, 2 OR 9=BLANK) 68 F3.1 NITRATE (MICROGRAM-ATOMS/LITER) 71 I1 NITRATE PRECISION (1 OR 9=BLANK) 72 F3.2 PH 75 I1 PH, PRECISION 76 2X BLANK ** 78 I1 DENSITY INVERSION FLAG 79 I1 NEXT RECORD TYPE 80 I1 RECORD TYPE ** FIELD DEFINED BY NODC, NO DATA SAMPLED OR CALCULATION NOT DONE BY THIS FACILITY.

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