Thermistor Chain Data Summary

The following pages contain time-series plots of the thermistor chain records from each of the three thermistor chains that were deployed during the course of the field study. Information specific to each thermistor chain deployment and it's data record is given below. Refer to the bathymetry map for the location of each chain and the R/V Henderson. The thermistors used for all three chains were 9311 Temperature Loggers produced by Oregon Environmental Instruments, Inc.

Each plot shows a 6 hour window of the data, with depth on the y-axis and Julian day on the x-axis (where each major tickmark for the x-axis is 1 h and each minor tickmark is 10 min). Each plot shows the same temperature range of 10.5 to 15.5 oC with isotherms drawn every 0.5 oC. The isotherms are labeled on the plots. The vertical lines with numbers at the base of the plot in the mooring array and R/V Henderson thermistor chain plots refer to the time and cast number of SlowDROP casts.

Mooring Array Thermistor Chain (data)

Sally MacIntyre, Kevin Flynn and Chris Wingard preparing to deploy the mooring array thermistor chain.Mike Twardowski and Sally MacIntyre feeding the mooring array thermistor chain out for deployment.Mike Twardowski holding the surface floats taut while Kevin Flynn and Chris Wingard prepare to drop the chain's anchor.

The mooring array thermistor chain was assembled onboard the R/V Henderson before it was deployed approximately 50 m inshore from the ship (as shown in the photos above). The R/V Henderson was anchored at 48o 40.62' N and 122o 53.45' W, while the mooring array thermistor chain was deployed at 48o 40.63' N and 122o 53.41' W. The chain was deployed on 11 June at 15:00 PDT and was recovered on 24 June at 13:00 PDT. The chain was configured with 12 thermistors spanning 19 m of the water column with a vertical spacing of 1.7 m and a temporal resolution of 20 s. The chain was set so the upper sensor would sit at ~2 m at low tide. The chain had to be moved to 48o 40.69' N and 122o 53.40' W on 15 June at 11:00 PDT to avoid fouling on the anchor lines of the ship as it shifted at anchor during a strong southwest wind event.

R/V Henderson Thermistor Chain (data)

Chris Wingard preparing the R/V Henderson thermistor chain for deployment.The R/V Henderson chain eeriely glowing in the water.The well of the R/V Henderson with the thermistor chain in place.

The well of the R/V Henderson was utilized to suspend a small chain of 5 thermistors spanning the upper 5 m of the water column with a vertical spacing of 1 m and a sampling frequency of 10 seconds. The thermistor located at 2 m depth failed 1 day after the initial deployment of chain. As noted above, the R/V Henderson was anchored at 48o 40.62' N and 122o 53.45' W. The thermistor chain was deployed on 10 June at 14:00 PDT and was recovered on 25 June at 15:00 PDT. On two occasions, the chain had to be pulled up while the R/V Henderson reset it's anchors.

Sill Thermistor Chain (data)

Attaching a thermistor to the chain.Sally MacIntyre and Chris Wingard securing a thermistor on the sill chain.Kevin Flynn holding the all-important marker float for the sill thermistor chain.

The third thermistor chain was deployed near the mouth of East Sound in the vicinity of an underwater ridge referred to here as the sill (see the bathymetry map for the location of the sill and the thermistor chain). The sill thermistor chain was configured with 12 thermistors spanning 22.5 m of the water column with a vertical resolution of 2 m and a sampling frequency of 20 s. The upper-most thermistor was set to 2.5 m at low tide. The sill thermistor chain was initially deployed on 10 June at 18:15 PDT at 48o 36.89' N and 122o 51.28' W. The chain was moved on 13 June to a location north of the sill (48o 37.44' N and 122o 51.94' W) with the hope that solitons generated by the sill would be more detectable. The chain was recovered on 24 June at 11:40 PDT.