The SeaFETTM reports pH measurements on the total scale. Values of pH reported on the total scale represent the effective hydrogen ion concentration with contributions from both free hydrogen ions and those which have reacted with sulfate.
Derivation of Kd from a In what follows we have left off the dependence on wavelength. In addition we have left off effects due to inelastic scattering. Modeling Kd(z) requires the inclusion of the depth dependence of the shape of the radiance...
To first order, the vertical resolution is set by the vertical profiling speed. The profiling speed is user configurable (which can be changed during the deployment). At typical profiling speeds of 20 cm/sec, the Thetis Profiler provides the required 0.25 m vertical...
All data on-board the Thetis Profiler is time stamped using the on-board processor clock. This clock provides 10 ms resolution. The on-board clock is synced to the shore side host controller computer during each surface telemetry session, though the user can...
The numeric difference between psu and ppt is small; both indicate ocean salinity. Prior to 1978, oceanographers referred to the physical quantity ppt (kg salt per kg water in parts per thousand). In 1978, the Practical Salinity Scale (PSS-78) was adopted, which...
The modern oceanographic definition of salinity is the Practical Salinity Scale of 1978 (PSS-78). By definition, PSS-78 is valid only in the range of 2 to 42 psu. Sea-Bird uses the PSS-78 algorithm in our software, without regard to those limitations on the valid...
ITS-90 was adopted in 1990 as the temperature scale; IPTS-68 was the previous standard. The differences are related to redefining certain triple points and other melt or freeze cells that are used as the fundamental standards for temperature. Over the oceanographic...
Upon receipt of an instrument, the initial accuracy is the accuracy when comparing to a known standard. Resolution is the smallest amount of change that a sensor can see.
Direct SV probes measure the time (flight time) required for a sound pulse to travel over a fixed length, using a high-speed clock to measure time. The clock starts when the pulse is emitted, and stops when the pulse is received. Theoretically, you only need to know...
Sea-Bird real-time data acquisition (Seasave V7) and data processing (SBE Data Processing) software supports calculation of Chen-Millero, Del Grosso, and Wilson sound velocities. The algorithms, as implemented in our software, are provided in the software...
The Oceanography Society (TOS) and Sea-Bird Scientific are proud to have partnered in hosting a webinar focused on sharing insights and advice with current students or recent graduates on how they can transition from their education to a role in academia and/or...
Celebrating and honoring our LGBTQIA+ communities At Sea-Bird Scientific, we are proud to stand with members of the LGBTQIA+ community during Pride Month 2023. As with last year, we changed our logo on social media to feature a rainbow throughout the month of June in...
We are proud to work with such excellent partners, one of them being the team over at Oceanography Magazine! This month, we are excited to feature Ellen Kappel, Oceanography Magazine Editor, for our May Partner Spotlight. Oceanography magazine is an excellent source...