HOT Data

HOT Water Sample Database

Water samples are collected

. Salinity samples are taken back to the University of Hawaii where they are measured using an Autosal salinometer . Phosphate, nitrate and silicate samples are also measured at the University of Hawaii while oxygen measurements are conducted aboard ship during the cruises.

Water sample data from HOT are written according to the *.sea files specified by the WOCE Hydrographic Programme Office, for submission of these data to the WHP. One file is written for each HOT cruise (e.g., hot1.sea contains the data from HOT-1).

Formats for these files are detailed in the WHP Office Report WHPO 90-1, available from

Steve Diggs, WHPO Data Manager
Scripps Institution of Oceanography
9500 Gilman Drive
La Jolla CA 92093-0214

The files are self-explanatory, one column is written for each measured parameter. Missing data are filled with -9. A 5-line heading labels each column.

The first year's temperatures are reported in IPTS-68. Subsequent temperature are reported in ITS-90 units. Since temperature sensor calibrations were done in IPTS-68 units, and the UNESCO routines require IPTS-68 temperature, all intermediate processing was done in IPTS-68. As a final step, temperature and potential temperature were converted to ITS-90 using

t_90 = 0.99976 t_68.

Variables having 7 asterisks on the 4th heading line have a quality flag associated with them. These 1-digit quality flags are concate- nated to form quality word which is listed as the last variable in each row. The values each digit can assume and their meanings are listed below:


Bottle quality flag definitions:



 Byte Value  Definition

     1       Not assigned.

     2       No problems noted.

     3       Leaking.

     4       Did not trip correctly.

    5-8      Not assigned.

     9       Samples not drawn from this bottle.

 

     

Water sample quality flag definitions:    



 Byte Value  Definition

     1       Sample for this measurement was drawn from water bottle

             but analysis not received.

     2       Acceptable measurement.

     3       Questionable measurement.

     4       Bad measurement.

     5       Not reported.

     6       Mean of replicate measurements.

     7       Manual chromatographic peak integration.

     8       Irregular digital chromatographic peak integration.

     9       Sample not drawn for this measurement from this bottle.

Autosal salinometer

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