Argo Canada Data Management Team Updates - November 10, 2023

Summary for meeting taking place on November 10, 2023.

Update/Takeaways from ADMT

• CHLA_ADJUSTED: Raphaelle Suazede presented on adjusting chlorophyll using a factor from a lookup table (date, location) or calculated based on first 5 cycles. Current process is to divide by 2 for all data (Roesler 2017). Simple to implement in python RTQC once we have LUT.
• RT adjustment of DOXY is a high priority. Can provide a gain value after 5 cycles, and populate DOXY_ADJUSTED in RT at python RTQC step. Chris needs to talk to Anh about this - new VMS variable and populating SCIENTIFIC_CALIB_COMMENT.

Cycle Timing

• Canadian floats are almost all compliant with time of day sampling. Only floats that appeared in Drucker/Riser audit list were NOVA, deep ARVOR floats and 2 very recently deployed ARVORs that have been reprogrammed to 235hr cycles already.

• Discussion on indicating time of day sampling regime in the meta file by John Gilson via CONFIG_MISSION_COMMENT. Not totally clear to me but I think we are meant to set it to -1 (i.e. TOD sampling off?).
• Presented our method for actively reprogramming PROVOR floats to effectively result in 235 hour cycles.

• PROVOR CTS5 floats: the new floats will require new syntax to reprogram, and also carry radiometry sensors. Plan will be to cycle through 24hr cycle plus extra local noon surfacings through the year.

RTQC Of PROVOR CTS5 Floats

• Need to add radiometry RTQC to python setup - just range test, very simple

DMQC Updates

• 4 floats ready for submission, going to do a couple more and submit as a batch
• Making an effort to do 1-2/week right now
• Will need to spend some time validating in-air method in code
• Upon DMQC, updating DOXY_QC=1 to DOXY_QC=3. Should we do that for all files more urgently?

Deployment Summary

All completed and planned deployments can be seen on the development blog planning page.

So far in 2023, 24 floats have been deployed:

• 5 PROVOR / 14 ARVOR / 5 deep ARVOR
• 11 BIO / 8 IOS / 5 ONC
• 3 RBR / 21 SBE

In the remainder of 2023 and into early 2024, 13 more deployments are planned:

• 2 PROVOR CTS5 / 9 ARVOR / 3 deep ARVOR
• 7 BIO / 2 IOS / 2 ONC / 2 Dalhousie
• 4 RBR / 9 SBE

Notable deployments:

• The crew of the DISCOVREY will be deploying 6 floats on their way to Cape Town, South Africa.
• An additional 6 floats (not in table) will be delivered to a vessel in Cape Town via the DISCOVERY for deployment in the Western Indian Ocean, date TBD.
• The HMCS VANCOUVER will deploy 2 floats near Hawaii
• The 2 PROVOR CTS5 floats will be deployed in the Lab Sea from the MERIAN, being loaded on November 21.
• The sailing vessel OCEANOLOG will deploy an ARVOR float as part of Sail for Science
• 2 deep ARVOR floats will be deployed from the HESPERIDES in the Southern Ocean (more floats to avoid ice!)
• An additional 5 floats (not in the table) will be sent on a joint Italian/NZ voyage to the Ross Sea

Beaufort Floats

Float Programming

The two floats deployed in the Beaufort Sea (4902610 and 4902611) were updated with new ice sensing algorithm (ISA) parameters. The parameters were provided by Steve Jayne based on data analysis of the Beaufort Gyre.

ISA works by detecting a temperature threshold over a certain depth range. The suggested range was between 20-10dbar with a threshold of -1.21deg C (90% success rate of avoiding ice when present) or -1.03 deg C (95% success rate).

I ran the parameter change by Jerome at NKE. He was cautious about it as the depth range Steve provided was more shallow than their default setting (-1.79 deg C between 50 and 20dbar), but that the changes looked fine in terms of reprogramming the float:

!MC 2 235    # cycle timing
!MC 3 235    # cycle timing phase 2, inaccessible
!MC 17 475   # surface/mid threshold 
!MC 18 1000  # mid/bottom threshold
!MC 20 5     # mid resolution
!MC 21 10    # bottom resolution
!IC 2 3      # number of detections to confirm ice, default
!IC 3 20     # start pressure detection
!IC 4 10     # stop pressure detection
!IC 5 -1210  # temperature threshold, millidegrees

Both floats successfully received the parameter change, but I cannot see ice parameter values in the messages. May consult NKE on this.

Preliminary Data

Float 4902610 collected 2 profiles before stopping reporting (last Oct 1, 2023). Float 4902611 has collected 3 (last reported Oct 25, 2023).