- Oceanus delay and schedule for remaining 2012 deployment cruises
- 2013 schedule
- CIET meeting in October
- Misc. Issues
Participants: Bob, Richard, Susan, Doug, Emilie, Rick, Jeff, John, Martin Rapa, Dean, Will
Oceanus delay and schedule
Oceanus will remain in shipyard longer than expected. Available to load for leg 4, Tuesday the 21st, sail on the 22nd of August at the earliest.
William revised timelines again and legs 4 and 5 are doable, just barely, if surveying is included. To save time, we discussed options of not surveying and not following to the bottom. The priority is as follows:
- Deploy, track to bottom and survey
- Deploy, track to bottom, do not survey
- Deploy, do not track or survey.
Because instruments are new and early anchor releases have occurred, it is strongly preferred that we track the instrument to the seafloor. Thus options 1 and 2 are acceptable. Option 3 is not advised. On leg 4, for example, we could save 1.5 days by not surveying, but tracking instruments to the seafloor.
Given the squeeze on time we also need to prioritize our site deployments; more on that below.
If all goes exceedingly well, all OBSs can be deployed and surveyed. However, that leaves no contingency time. To build contingency, it was decided that the earlier deployments should choose option 2 above. I.e., it is best to use the early part of the cruise to build up contingency in the event of either weather or instrument problems.
The 2013 schedule is under development. Scheduling needs to consider time for OBS refurbishment. Current estimates are:
- SIO: 4 weeks
- WHOI: 6 weeks
- LDEO: TBD
SIO/WHOI have pickup cruises in fall for Nabelek that we need to consider when building the schedule. LDEO will likely use Atlantis for ROV work.
Action Item: Toomey to develop an estimate of cruise durations for 2013
Data Quality and Availability
Action Item: Toomey to ping on IICs for dates when data available.
Shallow water instruments: There are reports that these stations are noisier and that biofouling is particularly severe above 100 m water depth. Encrusted and corrosion. Martin Rapa reported on= instrument out for a year, was at 55 m. Real mess, barnacles. Sacrificial anodes of 5 years, corrosion off of anchor.
Question came up of how to make decisions about deployment sites given noisy data and biofouling. Something to be discussed as we move forward, particularly as we learn more about current data and plan for 2013 deployments.
Action Item: Toomey to finalize dates, most likely in early October.
Data Delivery to DMC
- Why does it take so long to make the data available? Part of the reason is personnel availability.
- How much time does it take to do all of this if personnel are available? Less than one month, depending on whether or not there is a leap second. SIO got it on their server, making adjustments of leap second. Data is being looked at, not sure when it will be up at DMC.
Site prioritization for 2012
Need to prioritize sites for for upcoming deployment cruises. It looks like OBS performance for the year 1 Focused Array was poor. We want to consider that when prioritizing sites for year 2 and ensure that the Focused Array off of the MTJ is fully deployed.
Shallow water instruments