| Protocols and Definitions:
Thermometers, Scripps calibrated
Scripps supplies precision ingraved stem
mercury immersion thermometers manufacturered by Kahl Scientific
Instruments Corporation. All thermometers read in degrees Celcius,
with 0.1 °C divisions, but come in two different ranges; +8
to 26 °C or +4 to 22 °C. Although they are calibrated
against certified primary standards during the manufactureing
process, upon receipt, they are recalibrated by the Oceanic Data
Facility at SIO to 0.01 °C accuracy. Currently Scripp's calibrated
thermometers are being provided to Scripp's Pier and SE Farallon
Island.
Salinity analysis
Salinity samples are run on the Guildline, Model 8410, inductive salinometer.
The Guildline PortASal is calibrated before and after each group
of samples with a substandard seawater. Periodic checks on the conductivity
of the substandard is made by comparison with IAPSO Standard Seawater.
Salinity values are read to four decimal places (0.0001), and are
calculated using the algorithms for the Practical Salinity Scale,
1979 (UNESCO, 1981a). Salinity values are rounded up to two decimal
places (0.01) after conversion to PSU and reported to two decimal
places.
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