Chris’ notes before the meeting are in regular text. Notes taken during the meeting are in italics.
Recent Deployments
Recent deployments (since May 1) include 5 floats in the Lab Sea (3 Dal CTS5, 2 BIO CTS4), 1 float deployed from the sailing vessel Oceanolog (read more here), and 2 floats deployed along line P (1 deep ARVOR, 1 CTS4 w/ Nitrate).
Going a little further back, in April 4 floats were deployed, 2 on the AZMP (BIO CTS4) and 2 southeast of South Africa (ARVOR).
Dal floats: profiled daily while ship was in the area, now on 5-day cycles. Parking at 2000m to use as a pseudo-sediment trap via the BBP parking hook (see here for an example)
Nitrate float (4902679) is not on GDAC yet (Nitrate processing in progress), profiling daily?
| Program | Institute | Model | Date | Latitude | Longitude | Ship | IMEI | WMO | Serial No. |
|---|---|---|---|---|---|---|---|---|---|
| Argo Canada | IOS | PROVOR | 04 May, 2024 | 49.2800 | -134.6700 | JOHN P. TULLY | 300125010116590 | 4902679 | P44168-23CA001 |
| Argo ONC | ONC | Deep ARVOR | 07 May, 2024 | 49.8361 | -144.6701 | JOHN P. TULLY | 300534063507930 | 4902631 | AD2700-22CA001 |
| Argo Dalhousie | Dal | PROVOR | 13 May, 2024 | 56.5010 | -52.5990 | CELTIC EXPLORER | 300125062423120 | 4902686 | P53865-23CA003 |
| Argo Canada | BIO | ARVOR | 16 May, 2024 | 17.9857 | -65.0987 | OCEANOLOG | 300534062474370 | 4902609 | AI2600-22CA007 |
| Argo Dalhousie | Dal | PROVOR | 17 May, 2024 | 56.6650 | -48.9770 | CELTIC EXPLORER | 300125062031400 | 4902687 | P53865-23CA004 |
| Argo Dalhousie | Dal | PROVOR | 22 May, 2024 | 58.4275 | -49.4418 | CELTIC EXPLORER | 300125062035430 | 4902688 | P53865-23CA005 |
| Argo Canada | BIO | PROVOR | 06 Jun, 2024 | 59.5045 | -55.0209 | CAPT. JACQUES CARTIER | 300125010915310 | 4902675 | P41305-23CA002 |
| Argo Canada | BIO | PROVOR | 06 Jun, 2024 | 59.5044 | -55.0210 | CAPT. JACQUES CARTIER | 300125010917310 | 4902677 | P41305-23CA004 |
Arctic & Antarctic Floats
| WMO | Basin | Deployment Date | Last Cycle | Last Cycle Date |
|---|---|---|---|---|
| 4902610 | Beaufort Sea | Sep 19, 2023 | 29 | Jun 21, 2024 |
| 4902611 | Beaufort Sea | Oct 03, 2023 | 25 | May 27, 2024 |
| 4902664 | Ross Sea | Feb 07, 2024 | 11 | Feb 28, 2024 |
| 4902665 | Ross Sea | Jan 30, 2024 | 1 | Jan 31, 2024 |
| 4902667 | Ross Sea | Feb 07, 2024 | 20 | Mar 21, 2024 |
| 4902668 | Ross Sea | Feb 03, 2024 | 8 | Mar 02, 2024 |
| 4902669 | Ross Sea | Feb 07, 2024 | 11 | Feb 28, 2024 |
Beaufort:
- Both Beaufort Sea floats have resurfaced! 4902610 not on GDAC yet.
- ISA does not seem to have prevented floats from approaching/bumping into the ice
- Lost some data - ex. 4902611 did 3 cycles before going under ice, but newly sent data starts at cycle 13: reduce vertical resolution before next season?
Ross:
- Most floats have not reported since near deployment time, but 4902664 just reported on June 16, not on GDAC yet
Nitrate
Writing of Nitrate RTQC code is in progress. Official documentation is here. RTQC for Nitrate includes:
- global range test
- spike test
- stuck value test
- grey list test
- nitrate specific tests
Specific tests include checking for saturation of the spectrophotometer, absorbance at 240nm (evaluate sensor optics) and error fitting to a model. There is also a check for high bisulfide concentrations such as in the black sea, but these are special cases and likely only going to be evaluated by expert researchers.
Like oxygen, unadjusted nitrate is flagged as 3 by default. If TEMP_QC is 4, NITRATE_QC is also 4, and if PSAL_QC is 4, NITRATE_QC should be 3 as well, including for adjusted, but this can be reviewed at the DMQC step.
Near Surface Sampling
At the most recent AST Brian King presented on an evaluation of Argo floats sampling all the way to the surface. The defauly configuration of the CTD pump for NKE floats is to turn off the pump at 5dbar. I am in the process of changing this parameter to 2dbar for all floats and will use as the default going forward.