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Data Exercises

Q&A: Regular Spikes in Salinity

Q&A: Regular Spikes in Salinity

This salinity profile was from an arctic deployment in rough seas. At a certain point, we see regular salinity spikes of about ± .01 psu in the upcast data. Can you determine what caused this?

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Q&A: Temperature Mismatch

Q&A: Temperature Mismatch

Although they should match perfectly, the two sensors rarely reported the same temperature value throughout their deployment. Furthermore, the 16plusV2 appeared to stop logging, although the batteries still had life upon recovery. Can you identify the problem?

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Q&A: Diagnosing Salinity Spikes

Q&A: Diagnosing Salinity Spikes

Q&A: Diagnosing Salinity Spikes The figure above shows a time series of salinity from a moored CTD. For most of the deployment, salinity showed frequent downward spikes, dropping from an expected range of 18-26 psu to near zero. Can you determine the cause?...

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Q&A: Two Symptoms of the Same Problem

Q&A: Two Symptoms of the Same Problem

May 2020 Newsletter The data above show two major symptoms of the same problem occurring in different locations on a 19plusV2 profiling CTD. On the left, oxygen appears to drop below zero and is highly erratic during the downcast (light blue). However, once it hits a...

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Q&A: Moored Data Excursions

Q&A: Moored Data Excursions

February 2020 Newsletter The data above came from a HydroCAT-EP multiparameter probe moored in an estuary near Savannah, Georgia. The highlighted section shows a sudden change in the temperature and salinity data that lasted for approximately 4 days, and continued...

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Q&A: Negative Fluorescence Data

Q&A: Negative Fluorescence Data

December 2019 Newsletter Fluorescence is the light emitted by a particle after excitation from another light source. Sea-Bird Scientific fluorometers are widely used to measure fluorescence from chlorophyll as a method of measuring primary productivity. The figure...

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Q&A: Erratic Profiles

Q&A: Erratic Profiles

November 2019 Newsletter The data above come from a profiling CTD, deployed in sea conditions that caused approximately 1-meter ship heave. Two things stick out – relatively unchanging salinity data during the downcast, and noisy data during the upcast (shown in light...

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Featured Posts

Flushing and Storing pH Sensors on the HydroCAT-EP V2

The HydroCAT-EP V2's new pH sensor design makes it safer and easier than ever to swap sensors in the field. A new flushing port ensures that corrosive seawater stays far away from the electronics, while a new mechanical design creates a snug fit to withstand the...

HydroCAT-EP V2 Overview

Introducing the HydroCAT-EP V2, Sea-Bird Scientific’s latest multiparameter instrument. We took the field-proven MicroCAT (SBE 37) and added a host of integrated sensors to the base CTD to provide users with a robust sampling platform in a compact, self-contained...

Calibrating Dissolved Oxygen Sensors

Our dissolved oxygen sensors, the SBE 43 and SBE 63, are calibrated with tools and methods we learned from calibrating our world-class temperature and conductivity sensors. Get a look behind the scenes in our calibration lab.    Related...