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First Analysis of the Nares Strait CT-String Data

First Analysis of the Nares Strait CT-String Data. Berit Rabe & Helen Johnson. o. x. 6/8 CT-moorings recovered (each with 4 SBE37) 2 missing ones are assumed to be lost, no signal KS03: pressure sensor at 200dbar no data, but additional pressure sensor at 80dbar

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First Analysis of the Nares Strait CT-String Data

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  1. First Analysis of theNares Strait CT-String Data Berit Rabe & Helen Johnson

  2. o x • 6/8 CT-moorings recovered (each with 4 SBE37) • 2 missing ones are assumed to be lost, no signal • KS03: pressure sensor at 200dbar no data, • but additional pressure sensor at 80dbar • All other ones: complete 3-year record 109m

  3. SBE37 Mooring Design: • Depth of instruments: 30m, 80m, 130m, 200m • Pressure sensors at upper and lower instrument • Flexible, made for bending due to icebergs

  4. First evaluation of pressure data: Example: Pressure data KS05 upper instrument Red: original data Blue: 5 day low-pass filtered data Yellow: mean Green: standard deviation Pressure [dbar] Time [days since 01/01/2003]

  5. Mean and standard deviation for low-pass filtered data • Higher variability at 30m than at 200m as expected • If pressure difference higher than 0.5dbar before and after deployment exponential fit was used

  6. TS diagrams for KS01 and KS13 upper instruments as a function of depth. KS01 KS13

  7. 3 year salinity time series • Upper level: seasonal cycle, lowest salinity in summer • Deepening of isohalines towards Ellesmere Island at 80 and 130dbar

  8. 3 year temperature time series • Obvious seasonal variability, vertical instrument excursion and transient events... • Was winter 2003 anomalous?

  9. Salinity Profiles * Upper 2 3 Lower x KS01 KS03 KS05 KS07 KS09 KS13 Mean S for each depth bin (when instrument is there!)

  10. Temperature Profiles * Upper 2 3 Lower x KS01 KS03 KS05 KS07 KS09 KS13 Mean T for each depth bin (when instrument is there!)

  11. Salinity - Julian Day 220, with 2003 and 2006 CTD profiles * Upper 2 3 Lower x KS01 - CTD 2003 KS03 KS05 KS07 KS09 KS13 - CTD 2003 - CTD 2006 (dashed) Two tidal cycles....

  12. Temperature - Julian Day 220, with 2003 and 2006 CTD profiles * Upper 2 3 Lower x KS01 - CTD 2003 KS03 KS05 KS07 KS09 KS13 - CTD 2003 - CTD 2006 (dashed) Two tidal cycles....

  13. What next?! • Remaining calibration issues. • Plot some sections - “snapshots” in time and mean picture in any given season. • Look at particular events (and their signature in ADCP and IPS data too). • Quantify changes in baroclinic transport on various timescales (and examine their causes). • Lots lots more.....!

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