Dissolved Oxygen

Reference Designator
GA01SUMO-SBD11-04-DOSTAD000
Review Status
Review Complete
Note
Biofouling affected data quality.
Depth
1m
Class
DOSTA (Dissolved Oxygen Stable Response)
Make / Model
Aanderaa / Optode 4831

Dataset Reviews Last processed: 1/12/19, 12:01 AM

QC Check Info
Dep. Preferred Method Stream DD FD SG EG Gaps GD TS Rate (s) Pressure Comp. Time Order Valid Data Missing Data Data Comp. Missing Coords. Review
1 recovered_host 257 8 0 248 0 0 52,143 2 1 / 1 1 Complete
2 recovered_host 361 361 0 0 0 0 2,977,255 2 1 / Complete
3 recovered_host 445 427 0 0 5 20 3,451,809 2 0 / Complete
Data Ranges Review Images

Test Notes

  1. no other streams for comparison

Data Coverage

Deployment: 123
3%100%96%

Lat/Lon Differences (km)

Deployment: 123
1 0.00
2 10.690.00
3 1.2511.910.00

Example Composite Data Plot

System Annotations

Metadata Start Date End Date Comment
GA01SUMO
3/15/15, 5:25 PM 11/26/15, 5:08 AM

Deployment 1: Buoy log files showed that seawater was first detected inside the buoy well on 3/26/2015. Both leak detectors showed increasing presence of water over the period of deployment. Upon recovery of the mooring, no external damage was visible and the buoy did not appear to be floating lower than normal.

Id: 653 By: lgarzio

GA01SUMO-SBD11
3/15/15, 5:25 PM 11/26/15, 5:08 AM

Deployment 1: Upon recovery, the bottom of the buoy was heavily biofouled with gooseneck barnacles. The barnacle coverage likely caused imporper sea water flushing at the location of the intakes and sensor faces for the subsurface instruments.

Id: 654 By: lgarzio

GA01SUMO-SBD11-04-DOSTAD000
3/15/15, 5:25 PM 11/26/15, 5:08 AM

Deployment 1: A gooseneck barnacle was attached to the sensor membrane at recovery.

Id: 656 By: lgarzio

GA01SUMO-SBD11
11/14/15, 4:06 PM 11/8/16, 5:10 AM

Deployment 2: Upon recovery, the bottom of the buoy was heavily biofouled with barnacles.

Id: 663 By: lgarzio

GA01SUMO-SBD11
10/26/16, 9:47 PM 1/14/18, 5:24 AM

Deployment 3: Upon recovery, the bottom of the buoy was heavily biofouled.

Id: 385 By: lgarzio

Review Notes

Metadata Start Date End Date Comment
GA01SUMO-SBD11-04-DOSTAD000

Deployments 2 and 3: Dissolved oxygen concentrations in the beginning of both deployments seem reasonable, then quickly decline. It appears that the biofouling of the surface buoy negatively impacted the quality of the data for both deployments. I compared the instrument data to shipboard data from D0002 (nbp1510_010.cnv) and R0003 (at3903007.cnv). The shipboard CTD data are not available for the GA3 cruise - R0002 and D0003 (these files should be uploaded to alfresco). From the comparisons I was able to do, it appears that the instrument was recording values within a reasonable range at the beginning of the deployment, and unreasonably low values at the end of the deployment (compared to the shipboard CTD data). These data should be annotated as suspect.

By Lori Garzio, on 2/22/19

GA01SUMO-SBD11-04-DOSTAD000
Deployment: 2
2/1/16, 12:00 AM 11/8/16, 10:10 AM

Data are unreasonable, likely due to biofouling (see other note).

By Lori Garzio, on 2/22/19

GA01SUMO-SBD11-04-DOSTAD000
Deployment: 3
10/27/16, 1:47 AM 1/14/18, 10:24 AM

Data are unreasonable, likely due to biofouling (see other note).

By Lori Garzio, on 2/22/19

New Note