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SIO student cruise wrap-up

After 240 hours of hard work and 4,970 towed uCTD casts, we are happy to add SCoNE (point Sal Coastal circulatioN Experiment) to the list of successful student cruises made possible by the UC Ship Funds Program.
We wish to thank everyone who worked to make this experiment a reality, including the Science Party and the Crew of the R/V Robert Gordon Sproul. André is very grateful for the awesome mentoring provided by Jen MacKinnon, Amy Waterhouse and Kate Adams, and for the hard work Spencer Kawamoto, Paul Chua, Jonny Ladner, Liz Brenner, Mary Huey, Eva Friedlander and many others put in preparing for and executing this amazing and unprecedented coordinated effort with the other groups involved in the Inner Shelf DRI.
More on the Sproul’s story and science coming soon!
André Palóczy and Kate Adams.
R/V R. G. Sproul‘s Crew
Chris Welton        (Captain)
Paul Dempster    (1st Mate)

Katherine Pogue (2nd Mate)

Wayne Lacy         (Cook)
Ernie Bayer          (Chief Engineer)

The SCoNE Science Party gathered on the bow of the R/V Sproul. From left to right: Kate Adams (on top photo) Spencer Kawamoto (on bottom photo), Julia Dohner, Praneeth Gurumurthy, Sahra Webb, Jess CG, André Palóczy, Jeff Coogan, Alice Ren, Manuel Gutiérrez-Villanueva, María Hernández. Center: Jeremiah Brower. Anacapa Passage is seen in the background, with Santa Cruz and Anacapa Islands on the right and left, respectively. Photo credits: Spencer Kawamoto (top) and Kate Adams (bottom).

Feddersen Group’s nearshore moorings deployed

Yesterday (Sep/01) the Feddersen Group finished deploying their moorings with thermistor chains (T-chains) and sea spiders with upward-looking current meters (ADCPs). Check out more about their work on their recent blog post.

Below are a few maps showing the positions of the deployments (magenta diamonds). The red stars are the planned deployment positions for the remaining moorings, going in the water over the next couple of weeks. Keep an eye on the deployment map as new moorings pop up there.

 

Deployed (magenta diamonds) and planned (red stars) mooring positions.

Below are some zoomed-in views of the mooring lines.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ship ops teleconference notes – June/20/2017

Call minutes – Inner Shelf DRI ship ops (June/20/2017)

Attendees: Amy Waterhouse, Jen MacKinnon, André Palóczy, Ata Suanda, John Colosi.

SIO aircraft group (Luc and Ken):

  • Make sure some of the flights overlap with ship tracks. Want to look for surface signature of IWs and track them. Also interested in fronts and flow separation at Pt. Sal.

  • Will arrive at Pt. Sal on Sep/10 to set up. Can start flying on the 11th, but very flexible.

  • Observations/instrumentation: Directional surface wave spectrum (SSH from the LIDAR at ~30 cm horizontal resolution), surface temperature and surface velocity from feature tracking (from IR cam). Also surface wave breaking (from the visible-band cam).

  • Swath: For surface velocity ~2 km, for waves and fronts ~1 km – 200 m.

  • Flight speed: 50 m/s.

  • Flight times are weather dependent. If foggy, no flight.

  • Can send phone pictures to people in the ships.

General remarks:

  • Luc/John: During the pilot, saw more IW beams reaching Pt. Sal propagating from W to E or from SW to NE.

  • Luc/John: IWs were more energetic South of Pt. Sal (Between Pt. Arguelo and Pt. Conception).

  • Ata: A crude way of removing the barotropic tide from the ship data is to subtract the vertically-averaged velocity averaged over the ship track.

  • Jen: For the headland eddies module: How much vorticity is inshore/offshore of the 20 m isobath around Pt. Sal?

Ship ops teleconference notes – June/05/2017

Call minutes – Inner Shelf DRI ship ops (June/05/2017)

Attendees: Amy Waterhouse, Jen MacKinnon, Jack Barth, André Palóczy, Chris Chickadel, Melissa Moulton.

Info from UW aircraft group (Chris and Melissa):

  • Interested in surfzone-inner shelf exchange, fronts and surface signature of IWs and bores.

  • Can fly up to 8 h/day, refuel after 4 h and return to survey. ~1 h of transit.

  • Will be flying during 11-19/Sep and 5-14/Oct.

  • Instruments: IR and visible cameras, also surface currents. Resolution of ~6 m after processed.

  • The only real-time data available is from the visible-band camera.

  • Along-shore surveys up to 20 km, about ¼ South of Pt. Sal and ¾ North of it, up to SL Obispo.

  • Cross-shore surveys. Can cover the nearshore while Ken and Luc cover the offshore.

  • Melissa: Could do short ~45 min flights, or longer ones. Synopticity/coverage trade-off.

  • Interested in combining the subsurface ship data with the synoptic aircraft data. Will be able to 1) Sample interesting features found by the ship group and 2) Inform the ship group of interesting features.

Discussion on model sampling analyses:

  • Jen: Add white noise to simulate instrumental error.

  • Jen: Look how sampled model output changes as f(noise level, # of ships, sampling pattern).

  • Jack: Look at how aliasing changes with different sampling patterns with 2+ ships. Examples:

    • 2 ships sampling parallel lines (along- or cross-shelf) in opposite directions?

    • 2 ships sampling a bow tie pattern in between two isobaths.

    • 2 ships sampling parallel lines (along- or cross-shelf) in the same direction?

    • 3 ships sampling parallel isobaths in the same direction (e.g., Oceanus at ~100 m, Sproul at ~30 m and Kalipi at ~10 m)?

  • Jack: Calculate eddy cross-track transports (e.g., u’T’). Use as a metric.

General remarks:

  • Chris: Live radio communication: APL has one radio, Ken and Luc might have another one.

  • Chris: May be able to have live position information from an online product by NASA.

  • Jack: Daily evening meetings during experiment.

  • Jen: Headland eddies module will benefit greatly from aircrafts + ships + drifters synergies.

TODO:

  • André:

    • Sample the 3 test boxes (North/South of Pt. Sal and off Pt. Sal) and write meso-/submesoscale module summary.

    • Ask Manu about hi-freq (5-15 min) model output. Also discuss with Ata.

Ship ops teleconference notes – May/26/2017

Call minutes – Inner Shelf DRI ship ops (May/26/2017)

Attendees: Amy Waterhouse, Jen MacKinnon, André Palóczy, Jim Lerczak, Kate Adams, John Colosi.

Soliton chasing module comments:

  • The purpose of the longer line in the IW chasing document is to get a sense of deep to shallow transition.

  • Jim L.: We need to think about the spacing between ships chasing the IW fronts. What is the along-shelf coherence scale of the NLIWs and bores?

  • John: Are ship-based measurements of TKE dissipation more accurate than from moorings? Jen: Yes.

  • Jen, André: IW chasing cross-shelf lines will also produce useful data for the large-scale variability (e.g., vorticity, divergence, strain, dissipation).

General remarks:

  • John: Might have 2-3 days to spare at the end of mooring deployment period for surveying.

  • Jim L.: Kalipi will be available for ~10 h daily, return to Avila Beach early. Watch out for Santa Ana winds.

  • Jim L.: Will ship gear and Kalipi to a small facility on Avila Beach owned by Cal Poly.

  • Jim M.: Will help set up Hans Graber’s radar on the Oceanus.

  • Bottom is silty/sandy offshore of the ~30 m isobath, rocky around Pt. Sal and sandy elsewhere.

TODO:

  • André: Do ship sampling of model outputs (code is working, need higher-frequency model outputs to sample).

  • André: Write meso-/submesoscale module document.

  • John C.: Contact aircraft group (Ken, Luc, Chris C. and Gordon F.) asking about their plans (DONE, waiting for reply).

  • John C.: Contact radar group (Eric T. and Tony) asking about the X-band radar on the Ride (DONE, Eric will follow up by email next week).

  • Jim L.: Make simplified spreadsheet with schedules of the 4 vessels (overlapping periods, etc).

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